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Class core.sync.mutex.Mutex

This class represents a general purpose, recursive mutex.

class Mutex
  : object.Object.Monitor ;

Implemented using pthread_mutex on Posix and CRITICAL_SECTION on Windows.

Constructors

NameDescription
this () Initializes a mutex object.
this (obj) Initializes a mutex object and sets it as the monitor for obj.

Methods

NameDescription
lock () If this lock is not already held by the caller, the lock is acquired, then the internal counter is incremented by one.
lock_nothrow () If this lock is not already held by the caller, the lock is acquired, then the internal counter is incremented by one.
tryLock () If the lock is held by another caller, the method returns. Otherwise, the lock is acquired if it is not already held, and then the internal counter is incremented by one.
tryLock_nothrow () If the lock is held by another caller, the method returns. Otherwise, the lock is acquired if it is not already held, and then the internal counter is incremented by one.
unlock () Decrements the internal lock count by one. If this brings the count to zero, the lock is released.
unlock_nothrow () Decrements the internal lock count by one. If this brings the count to zero, the lock is released.
factory (classname) Create instance of class specified by the fully qualified name classname. The class must either have no constructors or have a default constructor.
opCmp (o) Compare with another Object obj.
opEquals (o) Test whether this is equal to o. The default implementation only compares by identity (using the is operator). Generally, overrides for opEquals should attempt to compare objects by their contents.
toHash () Compute hash function for Object.
toString () Convert Object to a human readable string.

Example

import core.thread : Thread;

class Resource
{
    Mutex mtx;
    int cargo;

    this() shared @safe nothrow
    {
        mtx = new shared Mutex();
        cargo = 42;
    }

    void useResource() shared @safe nothrow @nogc
    {
        mtx.lock_nothrow();
        (cast() cargo) += 1;
        mtx.unlock_nothrow();
    }
}

shared Resource res = new shared Resource();

auto otherThread = new Thread(
{
    foreach (i; 0 .. 10000)
        res.useResource();
}).start();

foreach (i; 0 .. 10000)
    res.useResource();

otherThread.join();

writeln(res.cargo); // 20042

Authors

Sean Kelly

License

Boost License 1.0