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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

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

Methods

Name	Description
`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 and overloads for `opEquals` should attempt to compare objects by their contents. A class will most likely want to add an overload that takes your specific type as the argument and does the content comparison. Then you can override this and forward it to your specific typed overload with a cast. Remember to check for `null` on the typed overload.
`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