[ { "psig_desc": [ "Psig_attribute", { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.text" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " Asynchronous programming with promises.\n\n A {b promise} is a placeholder for a single value which might take a long\n time to compute. Speaking roughly, a promise is a [ref] that can be filled\n in later. To make that precise, here is how promises differ from [ref]s:\n\n - A promise might not have a value yet. A promise in this state is called a\n {e pending} promise.\n - Writing a value into a promise is called {e resolving} it. A promise with\n a value is called a {e resolved} promise.\n - Each promise can be resolved only once. After a promise has a value, the\n promise is immutable.\n - It's possible to attach {b callbacks} to a promise. They will run when the\n promise has a value, i.e. is resolved. If the promise is already resolved\n when a callback is attached, the callback is run (almost) right away. If\n the promise is pending, the callback is put into a list and waits.\n\n So, promises are optional, write-once references, and when they don't yet\n have a value, they store a list of callbacks that are waiting for the value.\n\n The waiting callbacks make promises a natural data type for asynchronous\n programming. For example, you can ask Lwt to [read] a file. Lwt immediately\n returns you only a {e promise} for the data.\n\n You can neglect this promise for a while. You can do some other computation,\n request more I/O, etc. At some point, you might decide to attach a callback\n to the [read] promise, maybe several callbacks.\n\n In the meantime, the [read] operation is running in the background. Once it\n finishes, Lwt {e resolves} the [read] promise by putting the data into it.\n Lwt then runs the callbacks you attached.\n\n One of those might take the data, and ask Lwt to [write] it to STDOUT. Lwt\n gives you a promise for that, too, and the process repeats.\n\n Lwt has a small amount of syntactic sugar to make this look as natural as\n possible:\n\n{[\nlet () =\n Lwt_main.run begin\n let%lwt data = Lwt_io.(read_line stdin) in\n let%lwt () = Lwt_io.printl data in\n Lwt.return ()\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix echo.ml && ./a.out *)\n]}\n\n This is all explained in the next sections:\n\n - {!3_Quickstart} links these concepts to actual functions in Lwt – the most\n fundamental ones.\n - {!3_Tutorial} shows how to write examples like the above, and how\n concurrency happens.\n - {!3_Executionmodel} clarifies control flow when using Lwt.\n - {!3_GuidetotherestofLwt} shows how {e everything} else in Lwt fits into\n this framework.\n\n After that is the {{!2_Fundamentals} reference proper}, which goes into\n {e painful} levels of detail on every single type and value in this module,\n [Lwt]. Please be safe, and read only what you need from it :)\n\n Happy asynchronous programming!\n\n\n\n {3:3_Quickstart Quick start}\n\n {e All} of Lwt is variations on:\n\n - {b Promises} of type ['a ]{!Lwt.t} are placeholders for values of type\n ['a].\n - {!Lwt.bind} attaches {b callbacks} to promises. When a promise gets a\n value, its callbacks are called.\n - Separate {b resolvers} of type ['a ]{!Lwt.u} are used to write values into\n promises, through {!Lwt.wakeup_later}.\n - Promises and resolvers are created in pairs using {!Lwt.wait}. Lwt I/O\n functions call {!Lwt.wait} internally, but return only the promise.\n - {!Lwt_main.run} is used to wait on one “top-level” promise. When that\n promise gets a value, the program terminates.\n\n\n\n {3:3_Tutorial Tutorial}\n\n Let's read from STDIN. The first version is written using ordinary values\n from the OCaml standard library. This makes the program block until the user\n enters a line:\n\n{[\nlet () =\n let line : string = read_line () in\n print_endline \"Now unblocked!\";\n ignore line\n\n(* ocamlfind opt -linkpkg code.ml && ./a.out *)\n]}\n\n If we use a promise instead, execution continues immediately:\n\n{[\nlet () =\n let line_promise : string Lwt.t =\n Lwt_io.(read_line stdin) in\n print_endline \"Execution just continues...\";\n ignore line_promise\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n Indeed, this program is a little {e too} asynchronous – it exits right away!\n Let's force it to wait for [line_promise] at the end by calling\n {!Lwt_main.run}:\n\n{[\nlet () =\n let line_promise : string Lwt.t =\n Lwt_io.(read_line stdin) in\n print_endline \"Execution just continues...\";\n\n let line : string =\n Lwt_main.run line_promise in\n ignore line\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n {!Lwt_main.run} should only be called once, on one promise, at the top level\n of your program. Most of the time, waiting for promises is done using\n [let%lwt]. That is the recommended syntactic sugar for {!Lwt.bind}, and is\n pronounced “bind”:\n\n{[\nlet () =\n let p : unit Lwt.t =\n let%lwt line_1 = Lwt_io.(read_line stdin) in\n let%lwt line_2 = Lwt_io.(read_line stdin) in\n Lwt_io.printf \"%s and %s\\n\" line_1 line_2\n in\n\n Lwt_main.run p\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix code.ml && ./a.out *)\n]}\n\n The way that works is everything in scope after the “[in]” in\n “[let%lwt x =] ... [in] ...” goes into a callback, and “[x]” is that\n callback's argument. So, we could have been very explicit, and written the\n code like this:\n\n{[\nlet () =\n let p : unit Lwt.t =\n let line_1_promise : string Lwt.t = Lwt_io.(read_line stdin) in\n Lwt.bind line_1_promise (fun (line_1 : string) ->\n\n let line_2_promise : string Lwt.t = Lwt_io.(read_line stdin) in\n Lwt.bind line_2_promise (fun (line_2 : string) ->\n\n Lwt_io.printf \"%s and %s\\n\" line_1 line_2))\n in\n\n Lwt_main.run p\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n But, as you can see, this is verbose, and the indentation gets a bit crazy.\n So, we will always use [let%lwt].\n\n The code above reads two lines in sequence, because we ask Lwt to wait for\n [line_1], before calling the second {!Lwt_io.read_line} in the callback, to\n start the second I/O.\n\n We could also run I/O {e concurrently}. All we have to do is not start the\n second I/O in a callback of the first. Because it doesn't make sense to read\n two lines from STDIN concurrently, let's start two waits instead:\n\n{[\nlet () =\n Lwt_main.run begin\n let three_seconds : unit Lwt.t = Lwt_unix.sleep 3. in\n let five_seconds : unit Lwt.t = Lwt_unix.sleep 5. in\n let%lwt () = three_seconds in\n let%lwt () = Lwt_io.printl \"3 seconds passed\" in\n let%lwt () = five_seconds in\n Lwt_io.printl \"Only 2 more seconds passed\"\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix code.ml && ./a.out *)\n]}\n\n This program takes about five seconds to run. We are still new to [let%lwt],\n so let's desugar it:\n\n{[\nlet () =\n Lwt_main.run begin\n let three_seconds : unit Lwt.t = Lwt_unix.sleep 3. in\n let five_seconds : unit Lwt.t = Lwt_unix.sleep 5. in\n\n (* Both waits have already been started at this point! *)\n\n Lwt.bind three_seconds (fun () ->\n (* This is 3 seconds later. *)\n Lwt.bind (Lwt_io.printl \"3 seconds passed\") (fun () ->\n Lwt.bind five_seconds (fun () ->\n (* Only 2 seconds were left in the 5-second wait, so\n this callback runs 2 seconds after the first callback. *)\n Lwt_io.printl \"Only 2 more seconds passed\")))\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n And that's it! Concurrency in Lwt is simply a matter of whether you start an\n operation in the callback of another one or not. As a convenience, Lwt\n provides a few {{!2_Concurrency} helpers} for common concurrency patterns.\n\n\n {3:3_Executionmodel Execution model}\n\n It's important to understand that promises are a pure-OCaml data type. They\n don't do any fancy scheduling or I/O. They are just lists of callbacks (if\n pending), or containers for one value (if resolved).\n\n The interesting function is {!Lwt_main.run}. It's a wrapper around\n {{: http://man7.org/linux/man-pages/man2/select.2.html} [select(2)]},\n {{: http://man7.org/linux/man-pages/man7/epoll.7.html} [epoll(7)]},\n {{: https://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2}\n [kqueue(2)]}, or whatever asynchronous I/O API your system provides. On\n browsers, the work of {!Lwt_main.run} is done by the surrounding JavaScript\n engine, so you don't call {!Lwt_main.run} from inside your program. But the\n execution model is still the same, and the description below applies!\n\n To avoid writing out “underlying asynchronous I/O API,” we'll assume, in\n this section, that the API is [select(2)]. That's just for the sake of\n abbreviation. It doesn't actually matter, for most purposes, what the\n underlying I/O API is.\n\n Let's use the program from the tutorial that reads two lines as an example.\n Here it is, again, in its desugared form:\n\n{[\nlet () =\n let p : unit Lwt.t =\n let line_1_promise : string Lwt.t = Lwt_io.(read_line stdin) in\n Lwt.bind line_1_promise (fun (line_1 : string) ->\n\n let line_2_promise : string Lwt.t = Lwt_io.(read_line stdin) in\n Lwt.bind line_2_promise (fun (line_2 : string) ->\n\n Lwt_io.printf \"%s and %s\\n\" line_1 line_2))\n in\n\n Lwt_main.run p\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n {!Lwt_main.run} is your program's main I/O loop. You pass it a single\n promise, and it:\n\n + Uses [select(2)] to put your process to sleep until the next I/O\n completes.\n + That next I/O happens to be the one that reads [line_1]. {!Lwt_main.run}\n knows that I/O is supposed to resolve [line_1_promise], so it puts\n [line_1] into the promise and resolves it.\n + Resolving is an ordinary OCaml operation. It causes all the callbacks of\n [line_1_promise] to run, one after another. Each callback is also ordinary\n OCaml code. In our case, there is only one callback, but in general, there\n might be several, and they might also resolve additional promises. So,\n promise resolution triggers a “cascade” of callbacks. Eventually, however,\n we should run out of callbacks, and control will return to\n {!Lwt_main.run}.\n + In our example, our one callback registers a second I/O with\n {!Lwt_main.run} – the one that will read [line_2]. There are no callbacks\n left to run after that, so control returns to {!Lwt_main.run}.\n + {!Lwt_main.run} goes back to sleep again by calling [select(2)], now\n waiting for the second I/O that we just registered. The loop repeats\n itself from step 1.\n\n This has two major implications, one good and one bad. Let's start with the\n bad one.\n\n {b (1)} If one of your callbacks enters an infinite loop, calls an\n Lwt-unfriendly blocking I/O, or just runs for a really long time, it won't\n return control to {!Lwt_main.run} anytime soon. That means {!Lwt_main.run}\n won't get a chance to resolve any other Lwt I/O promises, even if the\n underlying I/O operations complete.\n\n In case your callback is just using the CPU for a really long time, you can\n insert a few calls to {!Lwt.pause} into it, and resume your computation\n in callbacks of [pause]. This is basically the same as\n {!Lwt_unix.sleep}[ 0.] – it's a promise that will be resolved by\n {!Lwt_main.run} {e after} any other I/O resolutions that are already in its\n queue.\n\n {b (2)} The good implication is that all your callbacks run in a single\n thread. This means that in most situations, you don't have to worry about\n locks, synchronization, etc. Anything that is in the same callback is\n guaranteed to run without interruption. Lwt programs are often {e much}\n easier to write and refactor, than equivalent programs written with threads\n – but both are concurrent!\n\n\n\n {3:3_GuidetotherestofLwt Guide to the rest of Lwt}\n\n This module [Lwt] is the pure-OCaml definition of promises and\n callback-calling. It has a few extras on top of what's described above:\n\n - {!2_Rejection}. Lwt promises can actually be resolved in two ways:\n {e fulfilled} with a value, or {e rejected} with an exception. There is\n nothing conceptually special about rejection – it's just that you can ask\n for callbacks to run only on fulfillment, only on rejection, etc.\n - {!2_Cancellation}. This is a special case of rejection, specifically with\n exception {!Lwt.Canceled}. It has extra helpers in the Lwt API.\n - {{!2_Concurrency} Concurrency helpers}. All of these could be implemented\n on top of {!Lwt.bind}. As we saw, Lwt concurrency requires only deciding\n whether to run something inside a callback, or outside it. These functions\n just implement common patterns, and make intent explicit.\n - Miscellaneous {{!2_Convenience} helpers}, and {{!2_Deprecated} deprecated}\n APIs.\n\n The next layer above module [Lwt] is the pure-OCaml Lwt “core” library,\n which provides some promise-friendly patterns, like streams and mvars. This\n consists of the modules {!Lwt_list}, {!Lwt_stream}, {!Lwt_result},\n {!Lwt_mutex}, {!Lwt_condition}, {!Lwt_mvar}, {!Lwt_pool}, and {!Lwt_switch}.\n\n Above that is the Lwt Unix binding, where I/O begins. This includes the\n module {!Lwt_main}, including the all-important {!Lwt_main.run}. The rest of\n the Unix binding consists of functions, each one of which...\n\n - ...starts a background I/O operation,\n - creates a promise for it and gives it to you,\n - registers with {!Lwt_main.run}, so if you attach callbacks to the promise,\n they will be called when the I/O operation completes.\n\n The functions are grouped into modules:\n\n - {!Lwt_unix} for Unix system calls.\n - {!Lwt_bytes} for Unix system calls on bigarrays.\n - {!Lwt_io} for [Stdlib]-like high-level channels, TCP servers, etc.\n - {!Lwt_process} for managing subprocesses.\n - {!Lwt_preemptive} for spawning system threads.\n - Miscellaneous modules {!Lwt_gc}, {!Lwt_engine}, {!Lwt_throttle},\n {!Lwt_timeout}, {!Lwt_sys}.\n\n Warning! Introductory material ends and detailed reference begins! 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"pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " Promises for values of type ['a].\n\n A {b promise} is a memory cell that is always in one of three {b states}:\n\n - {e fulfilled}, and containing one value of type ['a],\n - {e rejected}, and containing one exception, or\n - {e pending}, in which case it may become fulfilled or rejected later.\n\n A {e resolved} promise is one that is either fulfilled or rejected, i.e. not\n pending. Once a promise is resolved, its content cannot change. So, promises\n are {e write-once references}. The only possible state changes are (1) from\n pending to fulfilled and (2) from pending to rejected.\n\n Promises are typically “read” by attaching {b callbacks} to them. The most\n basic functions for that are {!Lwt.bind}, which attaches a callback that is\n called when a promise becomes fulfilled, and {!Lwt.catch}, for rejection.\n\n Promise variables of this type, ['a Lwt.t], are actually {b read-only} in\n Lwt. Separate {e resolvers} of type ['a ]{!Lwt.u} are used to write to them.\n Promises and their resolvers are created together by calling {!Lwt.wait}.\n There is one exception to this: most promises can be {e canceled} by calling\n {!Lwt.cancel}, without going through a resolver. 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"./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19416 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19414 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19418 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_var", "a" ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19423 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19425 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "t", [ { "ptyp_desc": [ "Ptyp_var", "b" ], "ptyp_loc": { "loc_start": { 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"pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19438 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19440 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19438 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19442 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19422 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19442 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19414 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19442 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, "pval_prim": [], "pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " [Lwt.bind p_1 f] makes it so that [f] will run when [p_1] is\n {{!t} {e fulfilled}}.\n\n When [p_1] is fulfilled with value [v_1], the callback [f] is called with\n that same value [v_1]. Eventually, after perhaps starting some I/O or other\n computation, [f] returns promise [p_2].\n\n [Lwt.bind] itself returns immediately. It only attaches the callback [f] to\n [p_1] – it does not wait for [p_2]. {e What} [Lwt.bind] returns is yet a\n third promise, [p_3]. Roughly speaking, fulfillment of [p_3] represents both\n [p_1] and [p_2] becoming fulfilled, one after the other.\n\n A minimal example of this is an echo program:\n\n{[\nlet () =\n let p_3 =\n Lwt.bind\n Lwt_io.(read_line stdin)\n (fun line -> Lwt_io.printl line)\n in\n Lwt_main.run p_3\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n Rejection of [p_1] and [p_2], and raising an exception in [f], are all\n forwarded to rejection of [p_3].\n\n {b Precise behavior}\n\n [Lwt.bind] returns a promise [p_3] immediately. [p_3] starts out pending,\n and is resolved as follows:\n\n - The first condition to wait for is that [p_1] becomes resolved. It does\n not matter whether [p_1] is already resolved when [Lwt.bind] is called, or\n becomes resolved later – the rest of the behavior is the same.\n - If and when [p_1] becomes resolved, it will, by definition, be either\n fulfilled or rejected.\n - If [p_1] is rejected, [p_3] is rejected with the same exception.\n - If [p_1] is fulfilled, with value [v], [f] is applied to [v].\n - [f] may finish by returning the promise [p_2], or raising an exception.\n - If [f] raises an exception, [p_3] is rejected with that exception.\n - Finally, the remaining case is when [f] returns [p_2]. From that point on,\n [p_3] is effectively made into a reference to [p_2]. This means they have\n the same state, undergo the same state changes, and performing any\n operation on one is equivalent to performing it on the other.\n\n {b Syntactic sugar}\n\n [Lwt.bind] is almost never written directly, because sequences of [Lwt.bind]\n result in growing indentation and many parentheses:\n\n{[\nlet () =\n Lwt_main.run begin\n Lwt.bind Lwt_io.(read_line stdin) (fun line ->\n Lwt.bind (Lwt_unix.sleep 1.) (fun () ->\n Lwt_io.printf \"One second ago, you entered %s\\n\" line))\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n The recommended way to write [Lwt.bind] is using the [let%lwt] syntactic\n sugar:\n\n{[\nlet () =\n Lwt_main.run begin\n let%lwt line = Lwt_io.(read_line stdin) in\n let%lwt () = Lwt_unix.sleep 1. in\n Lwt_io.printf \"One second ago, you entered %s\\n\" line\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix code.ml && ./a.out *)\n]}\n\n This uses the Lwt {{: Ppx_lwt.html} PPX} (preprocessor). Note that we had to\n add package [lwt_ppx] to the command line for building this program. We will\n do that throughout this manual.\n\n Another way to write [Lwt.bind], that you may encounter while reading code,\n is with the [>>=] operator:\n\n{[\nopen Lwt.Infix\n\nlet () =\n Lwt_main.run begin\n Lwt_io.(read_line stdin) >>= fun line ->\n Lwt_unix.sleep 1. >>= fun () ->\n Lwt_io.printf \"One second ago, you entered %s\\n\" line\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n The [>>=] operator comes from the module {!Lwt.Infix}, which is why we\n opened it at the beginning of the program.\n\n See also {!Lwt.map}. 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"./_opam/lib/lwt/lwt.mli", "pos_lnum": 575, "pos_bol": 22987, "pos_cnum": 23014 }, "loc_ghost": false } } ], "pval_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19403 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19442 }, "loc_ghost": false } } ], "psig_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19403 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 473, "pos_bol": 19403, "pos_cnum": 19442 }, "loc_ghost": false } }, { "psig_desc": [ "Psig_attribute", { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.text" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " {2:2_Rejection Rejection} ", { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23018 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23050 }, "loc_ghost": false }, null ] ], "pexp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23018 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23050 }, "loc_ghost": false }, "pexp_loc_stack": [], "pexp_attributes": [] }, [] ], "pstr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23018 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23050 }, "loc_ghost": false } } ] ], "attr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23018 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23050 }, "loc_ghost": false } } ], "psig_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23018 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 579, "pos_bol": 23018, "pos_cnum": 23050 }, "loc_ghost": false } }, { "psig_desc": [ "Psig_value", { "pval_name": { "loc2": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 581, "pos_bol": 23052, "pos_cnum": 23061 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 581, "pos_bol": 23052, "pos_cnum": 23068 }, "loc_ghost": false }, "txt2": "reraise" }, "pval_type": { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_constr", "exn", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 581, "pos_bol": 23052, "pos_cnum": 23071 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 581, "pos_bol": 23052, "pos_cnum": 23074 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_var", "a" ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 581, "pos_bol": 23052, "pos_cnum": 23078 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 581, "pos_bol": 23052, "pos_cnum": 23080 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 581, "pos_bol": 23052, "pos_cnum": 23071 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 581, "pos_bol": 23052, "pos_cnum": 23080 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, "pval_prim": [ "%reraise" ], "pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " [reraise e] raises the exception [e]. Unlike [raise e], [reraise e]\n preserves the existing exception backtrace and even adds a \"Re-raised at\"\n entry with the call location.\n\n This function is intended to be used in the exception handlers of\n [Lwt.catch] and [Lwt.try_bind].\n\n It is also used in the code produced by Lwt_ppx. 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"pos_bol": 23443, "pos_cnum": 23490 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23492 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23490 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23494 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23473 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23494 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23455 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23494 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, "pval_prim": [], "pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " [Lwt.catch f h] applies [f ()], which returns a promise, and then makes it\n so that [h] (“handler”) will run when that promise is {{!t} {e rejected}}.\n\n{[\nlet () =\n Lwt_main.run begin\n Lwt.catch\n (fun () -> raise Exit)\n (function\n | Exit -> Lwt_io.printl \"Got Stdlib.Exit\"\n | exn -> Lwt.reraise exn)\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n Despite the above code, the recommended way to write [Lwt.catch] is using\n the [try%lwt] syntactic sugar from the {{: Ppx_lwt.html} PPX}. Here is an\n equivalent example:\n\n{[\nlet () =\n Lwt_main.run begin\n try%lwt raise Exit\n with Exit -> Lwt_io.printl \"Got Stdlb.Exit\"\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix code.ml && ./a.out *)\n]}\n\n A particular advantage of the PPX syntax is that it is not necessary to\n artificially insert a catch-all [exn -> reraise exn] case. Like in the core\n language's [try] expression, the catch-all case is implied in [try%lwt].\n\n [Lwt.catch] is a counterpart to {!Lwt.bind} – {!Lwt.bind} is for\n fulfillment, and {!Lwt.catch} is for rejection.\n\n As with {!Lwt.bind}, three promises are involved:\n\n - [p_1], the promise returned from applying [f ()].\n - [p_2], the promise returned from applying [h exn].\n - [p_3], the promise returned by [Lwt.catch] itself.\n\n The remainder is (1) a precise description of how [p_3] is resolved, and\n (2) a warning about accidentally using ordinary [try] for exception handling\n in asynchronous code.\n\n {b (1)} [Lwt.catch] first applies [f ()]. It then returns [p_3] immediately.\n [p_3] starts out pending. It is resolved as follows:\n\n - If [f ()] returned a promise [p_1], and [p_1] becomes fulfilled, [p_3] is\n fulfilled with the same value.\n - [p_1] can instead become rejected. There is one other possibility: [f ()]\n itself raised an exception, instead of returning a promise. The behavior\n of [Lwt.catch] is the same whether [f ()] raised an exception, or returned\n a promise that is later rejected with an exception. Let's call the\n exception [exn].\n - [h exn] is applied.\n - [h exn] may return a promise, or might itself raise an exception. The\n first case is the interesting one, but the exception case is simple, so we\n cover the exception case first.\n - If [h exn] raises another exception [exn'], [p_3] is rejected with [exn'].\n - If [h exn] instead returns the promise [p_2], [p_3] is effectively made\n into a reference to [p_2]. This means [p_3] and [p_2] have the same state,\n undergo the same state changes, and performing any operation one is\n equivalent to performing it on the other. ", { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 592, "pos_bol": 23495, "pos_cnum": 23495 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 657, "pos_bol": 26189, "pos_cnum": 26239 }, "loc_ghost": false }, null ] ], "pexp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 592, "pos_bol": 23495, "pos_cnum": 23495 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 657, "pos_bol": 26189, "pos_cnum": 26239 }, "loc_ghost": false }, "pexp_loc_stack": [], "pexp_attributes": [] }, [] ], "pstr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 592, "pos_bol": 23495, "pos_cnum": 23495 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 657, "pos_bol": 26189, "pos_cnum": 26239 }, "loc_ghost": false } } ] ], "attr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 592, "pos_bol": 23495, "pos_cnum": 23495 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 657, "pos_bol": 26189, "pos_cnum": 26239 }, "loc_ghost": false } } ], "pval_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23443 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23494 }, "loc_ghost": false } } ], "psig_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23443 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 591, "pos_bol": 23443, "pos_cnum": 23494 }, "loc_ghost": false } }, { "psig_desc": [ "Psig_value", { "pval_name": { "loc2": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26245 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26253 }, "loc_ghost": false }, "txt2": "finalize" }, "pval_type": { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26257 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26261 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "t", [ { "ptyp_desc": [ "Ptyp_var", "a" ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26265 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26267 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26265 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26269 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26257 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26269 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26275 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26279 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "t", [ { "ptyp_desc": [ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26283 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26287 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26283 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26289 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26275 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26289 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "t", [ { "ptyp_desc": [ "Ptyp_var", "a" ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26294 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26296 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26294 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26298 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26274 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26298 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26256 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 659, "pos_bol": 26241, "pos_cnum": 26298 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, "pval_prim": [], "pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " [Lwt.finalize f c] applies [f ()], which returns a promise, and then makes\n it so [c] (“cleanup”) will run when that promise is {{!t} {e resolved}}.\n\n In other words, [c] runs no matter whether promise [f ()] is fulfilled or\n rejected. As the names suggest, [Lwt.finalize] corresponds to the [finally]\n construct found in many programming languages, and [c] is typically used for\n cleaning up resources:\n\n{[\nlet () =\n Lwt_main.run begin\n let%lwt file = Lwt_io.(open_file ~mode:Input \"code.ml\") in\n Lwt.finalize\n (fun () ->\n let%lwt content = Lwt_io.read file in\n Lwt_io.print content)\n (fun () ->\n Lwt_io.close file)\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix code.ml && ./a.out *)\n]}\n\n As with {!Lwt.bind} and {!Lwt.catch}, there is a syntactic sugar for\n [Lwt.finalize], though it is not as often used:\n\n{[\nlet () =\n Lwt_main.run begin\n let%lwt file = Lwt_io.(open_file ~mode:Input \"code.ml\") in\n begin\n let%lwt content = Lwt_io.read file in\n Lwt_io.print content\n end\n [%lwt.finally\n Lwt_io.close file]\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix code.ml && ./a.out *)\n]}\n\n Also as with {!Lwt.bind} and {!Lwt.catch}, three promises are involved:\n\n - [p_1], the promise returned from applying [f ()].\n - [p_2], the promise returned from applying [c ()].\n - [p_3], the promise returned by [Lwt.finalize] itself.\n\n [p_3] is returned immediately. It starts out pending, and is resolved as\n follows:\n\n - [f ()] is applied. If it finishes, it will either return a promise [p_1],\n or raise an exception.\n - If [f ()] raises an exception, [p_1] is created artificially as a promise\n rejected with that exception. So, no matter how [f ()] finishes, there is\n a promise [p_1] representing the outcome.\n - After [p_1] is resolved (fulfilled or rejected), [c ()] is applied. This\n is meant to be the cleanup code.\n - If [c ()] finishes, it will also either return a promise, [p_2], or raise\n an exception.\n - If [c ()] raises an exception, [p_2] is created artificially as a promise\n rejected with that exception. Again, no matter how [c ()] finishes, there\n is a promise [p_2] representing the outcome of cleanup.\n - If [p_2] is fulfilled, [p_3] is resolved the same way [p_1] had been\n resolved. In other words, [p_1] is forwarded to [p_3] when cleanup is\n successful.\n - If [p_2] is rejected, [p_3] is rejected with the same exception. In other\n words, [p_2] is forwarded to [p_3] when cleanup is unsuccessful. Note this\n means that if {e both} the protected code and the cleanup fail, the\n cleanup exception has precedence. 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The difference is that\n [Lwt.try_bind] runs different callbacks depending on {e how} [f ()] is\n resolved. This has two main implications:\n\n - The cleanup functions [g] and [h] each “know” whether [f ()] was fulfilled\n or rejected.\n - The cleanup functions [g] and [h] are passed the value [f ()] was\n fulfilled with, and, respectively, the exception [f ()] was rejected\n with.\n\n As with {!Lwt.catch}, it is recommended to use {!reraise} in the catch-all\n case of the exception handler:\n\n{[\nlet () =\n Lwt_main.run begin\n Lwt.try_bind\n (fun () -> raise Exit)\n (fun () -> Lwt_io.printl \"Got Success\")\n (function\n | Exit -> Lwt_io.printl \"Got Stdlib.Exit\"\n | exn -> Lwt.reraise exn)\n end\n\n(* ocamlfind opt -linkpkg -thread -package lwt.unix code.ml && ./a.out *)\n]}\n\n The rest is a detailed description of the promises involved.\n\n As with {!Lwt.finalize} and the several preceding functions, three promises\n are involved.\n\n - [p_1] is the promise returned from applying [f ()].\n - [p_2] is the promise returned from applying [h] or [g], depending on which\n one is chosen.\n - [p_3] is the promise returned by [Lwt.try_bind] itself.\n\n [Lwt.try_bind] returns [p_3] immediately. [p_3] starts out pending, and is\n resolved as follows:\n\n - [f ()] is applied. If it finishes, it either returns [p_1], or raises an\n exception.\n - If [f ()] raises an exception, [p_1] is created artificially as a promise\n rejected with that exception. So, no matter how [f ()] finishes, there is\n a promise [p_1] representing the outcome.\n - If [p_1] is fulfilled, [g] is applied to the value [p_1] is fulfilled\n with.\n - If [p_1] is rejected, [h] is applied to the exception [p_1] is rejected\n with.\n - So, in either case, a callback is applied. The rest of the procedure is\n the same no matter which callback was chosen, so we will refer to it as\n “the callback.”\n - If the callback finishes, it either returns [p_2], or raises an exception.\n - If the callback raises an exception, [p_3] is rejected with that\n exception.\n - If the callback returns [p_2], [p_3] is effectively made into an reference\n to [p_2]. They have the same state, including any state changes, and\n performing any operation on one is equivalent to performing it on the\n other. 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any of the promises in [ps] is rejected, the returned promise\n is also rejected. This means that none of the values will be available, even\n if some of the promises in [ps] were already resolved when one of them is\n rejected. For more fine-grained handling of rejection, structure the program\n with {!Lwt_stream} or {!Lwt_list}, handle rejections explicitly, or use\n {!Lwt.join} and collect values manually.\n\n @since 5.1.0 ", { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 984, "pos_bol": 38151, "pos_cnum": 38151 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 996, "pos_bol": 38796, "pos_cnum": 38815 }, "loc_ghost": false }, null ] ], "pexp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 984, "pos_bol": 38151, "pos_cnum": 38151 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 996, "pos_bol": 38796, "pos_cnum": 38815 }, "loc_ghost": false }, "pexp_loc_stack": [], "pexp_attributes": [] }, [] ], "pstr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 984, "pos_bol": 38151, "pos_cnum": 38151 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 996, "pos_bol": 38796, "pos_cnum": 38815 }, 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"pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " [Lwt.pick ps] returns a promise that is pending until {e one} promise in the\n list [ps] becomes {{!t} {e resolved}}.\n\n When at least one promise in [ps] is resolved, [Lwt.pick] tries to cancel\n all other promises that are still pending, using {!Lwt.cancel}.\n\n{[\nlet () =\n let echo =\n let%lwt line = Lwt_io.(read_line stdin) in\n Lwt_io.printl line\n in\n\n let timeout = Lwt_unix.sleep 5. in\n\n Lwt_main.run (Lwt.pick [echo; timeout])\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix code.ml && ./a.out *)\n]}\n\n If the first promise in [ps] to become resolved is fulfilled, the result\n promise [p] is also fulfilled, with the same value. Likewise, if the first\n promise in [ps] to become resolved is rejected, [p] is rejected with the\n same exception.\n\n If [ps] has no promises (if it is the empty list), [Lwt.pick ps] raises\n [Stdlib.Invalid_argument _].\n\n It's possible for multiple promises in [ps] to become resolved\n simultaneously. This happens most often when some promises [ps] are already\n resolved at the time [Lwt.pick] is called.\n\n In that case, if at least one of the promises is rejected, the result\n promise [p] is rejected with the same exception as one such promise, chosen\n arbitrarily. If all promises are fulfilled, [p] is fulfilled with the value\n of one of the promises, also chosen arbitrarily.\n\n The remaining functions in this section are variations on [Lwt.pick]. 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[ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41887 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41891 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_tuple", [ { "ptyp_desc": [ "Ptyp_constr", "t", [ { "ptyp_desc": [ "Ptyp_var", "a" ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41896 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41898 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41896 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41900 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "u", [ { "ptyp_desc": [ "Ptyp_var", "a" ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41903 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41905 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41903 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41907 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41896 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41907 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41887 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41908 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, "pval_prim": [], "pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " [Lwt.task] is the same as {!Lwt.wait}, except the resulting promise [p] is\n {{!Lwt.cancel} cancelable}.\n\n This is significant, because it means promises created by [Lwt.task] can be\n resolved (specifically, rejected) by canceling them directly, in addition to\n being resolved through their paired resolvers.\n\n In contrast, promises returned by {!Lwt.wait} can only be resolved through\n their resolvers. ", { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1080, "pos_bol": 41909, "pos_cnum": 41909 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1088, "pos_bol": 42313, "pos_cnum": 42336 }, "loc_ghost": false }, null ] ], "pexp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1080, "pos_bol": 41909, "pos_cnum": 41909 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1088, "pos_bol": 42313, "pos_cnum": 42336 }, "loc_ghost": false }, "pexp_loc_stack": [], "pexp_attributes": [] }, [] ], "pstr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1080, "pos_bol": 41909, "pos_cnum": 41909 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1088, "pos_bol": 42313, "pos_cnum": 42336 }, "loc_ghost": false } } ] ], "attr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1080, "pos_bol": 41909, "pos_cnum": 41909 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1088, "pos_bol": 42313, "pos_cnum": 42336 }, "loc_ghost": false } } ], "pval_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41876 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41908 }, "loc_ghost": false } } ], "psig_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41876 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1079, "pos_bol": 41876, "pos_cnum": 41908 }, "loc_ghost": false } }, { "psig_desc": [ "Psig_value", { "pval_name": { "loc2": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42342 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42348 }, "loc_ghost": false }, "txt2": "cancel" }, "pval_type": { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_constr", "t", [ { "ptyp_desc": [ "Ptyp_any" ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42351 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42352 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42351 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42354 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42358 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42362 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42351 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1090, "pos_bol": 42338, "pos_cnum": 42362 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, "pval_prim": [], "pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " [Lwt.cancel p] attempts to {e cancel} the pending promise [p], without\n needing access to its resolver.\n\n It is recommended to avoid [Lwt.cancel], and handle cancelation by tracking\n the needed extra state explicitly within your library or application.\n\n A {b canceled} promise is one that has been rejected with exception\n {!Lwt.Canceled}.\n\n There are straightforward ways to make promises canceled. One could create a\n promise that {e starts out} canceled, with {!Lwt.fail}[ Lwt.Canceled]. It's\n also possible to {e make} a promise canceled through its resolver, by\n calling {!Lwt.wakeup_later_exn}[ r Lwt.Canceled].\n\n This function, [Lwt.cancel], provides another method, which can cancel\n pending promises {e without} going through their resolvers – it acts\n directly on promises.\n\n Like any other promise rejection, the canceled state of a promise is\n propagated “forwards” by {!Lwt.bind}, {!Lwt.join}, etc., as described in the\n documentation of those functions.\n\n {b Cancellation} is a separate phase, triggered only by {!Lwt.cancel}, that\n searches {e backwards}, strating from [p], for promises to reject with\n {!Lwt.Canceled}. Once those promises are found, they are canceled, and then\n ordinary, forwards rejection propagation takes over.\n\n All of this will be made precise, but first let's have an example:\n\n{[\nlet () =\n let p =\n let%lwt () = Lwt_unix.sleep 5. in\n Lwt_io.printl \"Slept five seconds\"\n in\n\n Lwt.cancel p;\n\n Lwt_main.run p\n\n(* ocamlfind opt -linkpkg -thread -package lwt_ppx,lwt.unix code.ml && ./a.out *)\n]}\n\n At the time [Lwt.cancel] is called, [p] “depends” on the [sleep] promise\n (the [printl] is not yet called, so its promise hasn't been created).\n\n So, {!Lwt.cancel} recursively tries to cancel the [sleep] promise. That is\n an example of the backwards search. The [sleep] promise is a pending promise\n that doesn't depend on anything, so backwards search stops at it. The state\n of the [sleep] promise is set to {e rejected} with {!Lwt.Canceled}.\n\n {!Lwt.bind} then propagates the rejection forwards to [p], so [p] also\n becomes canceled.\n\n Eventually, this rejection reaches {!Lwt_main.run}, which raises the\n {!Lwt.Canceled} as an ordinary exception. The [sleep] does not complete, and\n the [printl] is never started.\n\n Promises, like the [sleep] promise above, that can be rejected by\n [Lwt.cancel] are {b cancelable}. Most promises in Lwt are either cancelable,\n or depend on cancelable promises. The functions {!Lwt.wait} and\n {!Lwt.no_cancel} create promises that are {e not} cancelable.\n\n The rest is a detailed description of how the [Lwt.cancel] backwards search\n works.\n\n - If [p] is already resolved, [Lwt.cancel] does nothing.\n - If [p] was created by {!Lwt.wait} or {!Lwt.no_cancel}, [Lwt.cancel] does\n nothing.\n - If [p] was created by {!Lwt.task} or {!Lwt.protected}, [Lwt.cancel]\n rejects it with [Lwt.Canceled]. This rejection then propagates normally\n through any Lwt calls that depend on [p]. Most I/O promises are internally\n created by calling {!Lwt.task}.\n - Suppose [p_3] was returned by {!Lwt.bind}, {!Lwt.map}, {!Lwt.catch},\n {!Lwt.finalize}, or {!Lwt.try_bind}. Then, see those functions for the\n naming of the other promises involved. If [p_3] is pending, then either\n [p_1] is pending, or [p_2] is pending. [Lwt.cancel p_3] then tries\n recursively to cancel whichever of these two is still pending. If that\n succeeds, [p_3] {e may} be canceled later by the normal propagation of\n rejection.\n - Suppose [p] was returned by {!Lwt.join}, {!Lwt.pick}, or similar function,\n which was applied to the promise list [ps]. {!Lwt.cancel} then recursively\n tries to cancel each promise in [ps]. If one of those cancellations\n succeeds, [p] {e may} be canceled later by the normal propagation of\n rejection. 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", { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1886, "pos_bol": 70624, "pos_cnum": 70624 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1889, "pos_bol": 70730, "pos_cnum": 70787 }, "loc_ghost": false }, null ] ], "pexp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1886, "pos_bol": 70624, "pos_cnum": 70624 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1889, "pos_bol": 70730, "pos_cnum": 70787 }, "loc_ghost": false }, "pexp_loc_stack": [], "pexp_attributes": [] }, [] ], "pstr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1886, "pos_bol": 70624, "pos_cnum": 70624 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1889, "pos_bol": 70730, "pos_cnum": 70787 }, "loc_ghost": false } } ] ], "attr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1886, "pos_bol": 70624, "pos_cnum": 70624 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1889, "pos_bol": 70730, "pos_cnum": 70787 }, "loc_ghost": false } } ], "pval_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1885, "pos_bol": 70593, "pos_cnum": 70593 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1885, "pos_bol": 70593, "pos_cnum": 70623 }, "loc_ghost": false } } ], "psig_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1885, "pos_bol": 70593, "pos_cnum": 70593 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1885, "pos_bol": 70593, "pos_cnum": 70623 }, "loc_ghost": false } }, { "psig_desc": [ "Psig_value", { "pval_name": { "loc2": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70793 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70816 }, "loc_ghost": false }, "txt2": "register_pause_notifier" }, "pval_type": { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_constr", "int", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70820 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70823 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70827 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70831 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70820 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70831 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70836 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70840 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70819 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70840 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, "pval_prim": [], "pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " [Lwt.register_pause_notifier f] causes [f] to be called every time\n {!Lwt.pause} is called. The result of [Lwt.paused_count ()] is passed to\n [f].\n\n Only one such function can be registered at a time. There is only a single\n internal reference cell available for this purpose.\n\n This function is intended for internal use by Lwt. ", { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1892, "pos_bol": 70841, "pos_cnum": 70841 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1899, "pos_bol": 71135, "pos_cnum": 71192 }, "loc_ghost": false }, null ] ], "pexp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1892, "pos_bol": 70841, "pos_cnum": 70841 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1899, "pos_bol": 71135, "pos_cnum": 71192 }, "loc_ghost": false }, "pexp_loc_stack": [], "pexp_attributes": [] }, [] ], "pstr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1892, "pos_bol": 70841, "pos_cnum": 70841 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1899, "pos_bol": 71135, "pos_cnum": 71192 }, "loc_ghost": false } } ] ], "attr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1892, "pos_bol": 70841, "pos_cnum": 70841 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1899, "pos_bol": 71135, "pos_cnum": 71192 }, "loc_ghost": false } } ], "pval_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70789 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70840 }, "loc_ghost": false } } ], "psig_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70789 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1891, "pos_bol": 70789, "pos_cnum": 70840 }, "loc_ghost": false } }, { "psig_desc": [ "Psig_value", { "pval_name": { "loc2": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1901, "pos_bol": 71194, "pos_cnum": 71198 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1901, "pos_bol": 71194, "pos_cnum": 71212 }, "loc_ghost": false }, "txt2": "abandon_paused" }, "pval_type": { "ptyp_desc": [ "Ptyp_arrow", [ "Nolabel" ], { "ptyp_desc": [ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1901, "pos_bol": 71194, "pos_cnum": 71215 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1901, "pos_bol": 71194, "pos_cnum": 71219 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, { "ptyp_desc": [ "Ptyp_constr", "unit", [] ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1901, "pos_bol": 71194, "pos_cnum": 71223 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1901, "pos_bol": 71194, "pos_cnum": 71227 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] } ], "ptyp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1901, "pos_bol": 71194, "pos_cnum": 71215 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1901, "pos_bol": 71194, "pos_cnum": 71227 }, "loc_ghost": false }, "ptyp_loc_stack": [], "ptyp_attributes": [] }, "pval_prim": [], "pval_attributes": [ { "attr_name": { "loc2": { "loc_start": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_end": { "pos_fname": "_none_", "pos_lnum": 0, "pos_bol": 0, "pos_cnum": -1 }, "loc_ghost": true }, "txt2": "ocaml.doc" }, "attr_payload": [ "PStr", [ { "pstr_desc": [ "Pstr_eval", { "pexp_desc": [ "Pexp_constant", [ "Pconst_string", " Causes promises created with {!Lwt.pause} to remain forever pending. See\n {!Lwt_main.abandon_yielded_and_paused} before {!Lwt_main.yield} is phased out.\n\n This function is intended for internal use by Lwt. ", { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1902, "pos_bol": 71228, "pos_cnum": 71228 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1905, "pos_bol": 71389, "pos_cnum": 71446 }, "loc_ghost": false }, null ] ], "pexp_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1902, "pos_bol": 71228, "pos_cnum": 71228 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1905, "pos_bol": 71389, "pos_cnum": 71446 }, "loc_ghost": false }, "pexp_loc_stack": [], "pexp_attributes": [] }, [] ], "pstr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1902, "pos_bol": 71228, "pos_cnum": 71228 }, "loc_end": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1905, "pos_bol": 71389, "pos_cnum": 71446 }, "loc_ghost": false } } ] ], "attr_loc": { "loc_start": { "pos_fname": "./_opam/lib/lwt/lwt.mli", "pos_lnum": 1902, "pos_bol": 71228, "pos_cnum": 71228 }, "loc_end": { "pos_fname": 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In fact,\n the function that does {e that} is ordinary {!Lwt.bind}. 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This is because\n (a) these exceptions are not reproducible (in that they are thrown at\n different points of your program depending on the machine that your program\n runs on) and (b) recovering from these errors may be impossible.\n\n The helpers below allow you to change the way that Lwt handles the two OCaml\n runtime exceptions [Out_of_memory] and [Stack_overflow]. 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With it the all the exceptions\n (including [Out_of_memory] and [Stack_overflow]) can be handled: caught\n and transformed into rejected promises. 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