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| " {1:examples Examples}\n\n {2 Basic Thread Coordination}\n\n A basic use case is to have global counters that are updated in a\n thread-safe way, for example to keep some sorts of metrics\n over IOs performed by the program. Another basic use case is to coordinate\n the termination of threads in a given program, for example when one thread\n finds an answer, or when the program is shut down by the user.\n\n Here, for example, we're going to try to find a number whose hash\n satisfies a basic property. To do that, we'll run multiple threads which\n will try random numbers until they find one that works.\n\n Of course the output below is a sample run and will change every time\n the program is run.\n\n {[\n (* use for termination *)\n let stop_all_threads = Atomic.make false\n\n (* total number of individual attempts to find a number *)\n let num_attempts = Atomic.make 0\n\n (* find a number that satisfies [p], by... trying random numbers\n until one fits. *)\n let find_number_where (p:int -> bool) =\n let rand = Random.State.make_self_init() in\n while not (Atomic.get stop_all_threads) do\n\n let n = Random.State.full_int rand max_int in\n ignore (Atomic.fetch_and_add num_attempts 1 : int);\n\n if p (Hashtbl.hash n) then (\n Printf.printf \"found %d (hash=%d)\\n%!\" n (Hashtbl.hash n);\n Atomic.set stop_all_threads true; (* signal all threads to stop *)\n )\n done;;\n\n\n (* run multiple domains to search for a [n] where [hash n <= 100] *)\n let () =\n let criterion n = n <= 100 in\n let threads =\n Array.init 8\n (fun _ -> Domain.spawn (fun () -> find_number_where criterion))\n in\n Array.iter Domain.join threads;\n Printf.printf \"total number of attempts: %d\\n%!\"\n (Atomic.get num_attempts) ;;\n\n - : unit = ()\n found 1651745641680046833 (hash=33)\n total number of attempts: 30230350\n ]}\n\n {2 Treiber Stack}\n\n Another example is a basic\n {{: https://en.wikipedia.org/wiki/Treiber_stack} Treiber stack}\n (a thread-safe stack) that can be safely shared between threads.\n\n Note how both [push] and [pop] are recursive, because they attempt to\n swap the new stack (with one more, or one fewer, element) with the old\n stack.\n This is optimistic concurrency: each iteration of, say, [push stack x]\n gets the old stack [l], and hopes that by the time it tries to replace\n [l] with [x::l], nobody else has had time to modify the list. If the\n [compare_and_set] fails it means we were too optimistic, and must try\n again.\n\n {[\n type 'a stack = 'a list Atomic.t\n\n let rec push (stack: _ stack) elt : unit =\n let cur = Atomic.get stack in\n let success = Atomic.compare_and_set stack cur (elt :: cur) in\n if not success then\n push stack elt\n\n let rec pop (stack: _ stack) : _ option =\n let cur = Atomic.get stack in\n match cur with\n | [] -> None\n | x :: tail ->\n let success = Atomic.compare_and_set stack cur tail in\n if success then Some x\n else pop stack\n\n # let st = Atomic.make []\n # push st 1\n - : unit = ()\n # push st 2\n - : unit = ()\n # pop st\n - : int option = Some 2\n # pop st\n - : int option = Some 1\n # pop st\n - : int option = None\n ]}\n ", | |
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