1Mutex(3)                         OCaml library                        Mutex(3)
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NAME

6       Mutex - Locks for mutual exclusion.
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Module

9       Module   Mutex
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Documentation

12       Module Mutex
13        : sig end
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16       Locks for mutual exclusion.
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18       Mutexes  (mutual-exclusion  locks)  are used to implement critical sec‐
19       tions and protect shared mutable data structures against concurrent ac‐
20       cesses.  The typical use is (if m is the mutex associated with the data
21       structure D ):
22            Mutex.lock m;
23            (* Critical section that operates over D *);
24            Mutex.unlock m
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31       type t
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34       The type of mutexes.
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38       val create : unit -> t
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40       Return a new mutex.
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44       val lock : t -> unit
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46       Lock the given mutex. Only one thread can have the mutex locked at  any
47       time.  A thread that attempts to lock a mutex already locked by another
48       thread will suspend until the other thread unlocks the mutex.
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51       Before4.12
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53       Sys_error was not raised for recursive locking (platform-dependent  be‐
54       haviour)
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58       Raises  Sys_error  if the mutex is already locked by the thread calling
59       Mutex.lock .
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63       val try_lock : t -> bool
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65       Same as Mutex.lock , but does not suspend the calling thread if the mu‐
66       tex  is  already locked: just return false immediately in that case. If
67       the mutex is unlocked, lock it and return true .
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71       val unlock : t -> unit
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73       Unlock the given mutex. Other threads suspended trying to lock the  mu‐
74       tex  will  restart.   The mutex must have been previously locked by the
75       thread that calls Mutex.unlock .
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78       Before4.12
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80       Sys_error was not raised when unlocking an unlocked mutex or  when  un‐
81       locking a mutex from a different thread.
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85       Raises  Sys_error  if  the  mutex  is unlocked or was locked by another
86       thread.
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92OCamldoc                          2021-07-22                          Mutex(3)