94 lines
4.9 KiB
OCaml
94 lines
4.9 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy and Pascal Cuoq, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1995 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the GNU Library General Public License. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* Module [Thread]: lightweight threads for Posix 1003.1c and Win32 *)
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type t
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(* The type of thread handles. *)
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(** Thread creation and termination *)
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val create : ('a -> 'b) -> 'a -> t
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(* [Thread.create funct arg] creates a new thread of control,
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in which the function application [funct arg]
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is executed concurrently with the other threads of the program.
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The application of [Thread.create]
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returns the handle of the newly created thread.
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The new thread terminates when the application [funct arg]
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returns, either normally or by raising an uncaught exception.
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In the latter case, the exception is printed on standard error,
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but not propagated back to the parent thread. Similarly, the
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result of the application [funct arg] is discarded and not
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directly accessible to the parent thread. *)
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external self : unit -> t = "caml_thread_self"
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(* Return the thread currently executing. *)
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external id : t -> int = "caml_thread_id"
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(* Return the identifier of the given thread. A thread identifier
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is an integer that identifies uniquely the thread.
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It can be used to build data structures indexed by threads. *)
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val exit : unit -> unit
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(* Terminate prematurely the currently executing thread. *)
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val kill : t -> unit
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(* Terminate prematurely the thread whose handle is given. *)
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(** Suspending threads *)
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val delay: float -> unit
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(* [delay d] suspends the execution of the calling thread for
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[d] seconds. The other program threads continue to run during
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this time. *)
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external join : t -> unit = "caml_thread_join"
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(* [join th] suspends the execution of the calling thread
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until the thread [th] has terminated. *)
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val wait_read : Unix.file_descr -> unit
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val wait_write : Unix.file_descr -> unit
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(* These functions do nothing in this implementation. *)
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val wait_timed_read : Unix.file_descr -> timeout:float -> bool
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val wait_timed_write : Unix.file_descr -> timeout:float -> bool
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(* Suspend the execution of the calling thread until at least
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one character is available for reading ([wait_read]) or
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one character can be written without blocking ([wait_write])
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on the given Unix file descriptor. Wait for at most
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the amount of time given as second argument (in seconds).
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Return [true] if the file descriptor is ready for input/output
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and [false] if the timeout expired. *)
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(* These functions return immediately [true] in the Win32
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implementation. *)
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val select :
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read:Unix.file_descr list -> write:Unix.file_descr list ->
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exn:Unix.file_descr list -> timeout:float ->
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Unix.file_descr list * Unix.file_descr list * Unix.file_descr list
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(* Suspend the execution of the calling thead until input/output
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becomes possible on the given Unix file descriptors.
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The arguments and results have the same meaning as for
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[Unix.select]. *)
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(* This function is not implemented yet under Win32. *)
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val wait_pid : int -> int * Unix.process_status
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(* [wait_pid p] suspends the execution of the calling thread
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until the process specified by the process identifier [p]
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terminates. Returns the pid of the child caught and
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its termination status, as per [Unix.wait]. *)
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val wait_signal : int list -> int
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(* [wait_signal sigs] suspends the execution of the calling thread
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until the process receives one of the signals specified in the
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list [sigs]. It then returns the number of the signal received.
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Signal handlers attached to the signals in [sigs] will not
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be invoked. Do not call [wait_signal] concurrently
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from several threads on the same signals. *)
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val yield : unit -> unit
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(* Re-schedule the calling thread without suspending it.
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This function can be used to give scheduling hints,
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telling the scheduler that now is a good time to
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switch to other threads. *)
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