77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
|
|
// License & terms of use: http://www.unicode.org/copyright.html
|
|
/*
|
|
******************************************************************************
|
|
*
|
|
* Copyright (C) 1997-2013, International Business Machines
|
|
* Corporation and others. All Rights Reserved.
|
|
*
|
|
******************************************************************************
|
|
*/
|
|
//----------------------------------------------------------------------------
|
|
// File: mutex.h
|
|
//
|
|
// Lightweight C++ wrapper for umtx_ C mutex functions
|
|
//
|
|
// Author: Alan Liu 1/31/97
|
|
// History:
|
|
// 06/04/97 helena Updated setImplementation as per feedback from 5/21 drop.
|
|
// 04/07/1999 srl refocused as a thin wrapper
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
#ifndef MUTEX_H
|
|
#define MUTEX_H
|
|
|
|
#include "unicode/utypes.h"
|
|
#include "unicode/uobject.h"
|
|
#include "umutex.h"
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
/**
|
|
* Mutex is a helper class for convenient locking and unlocking of a UMutex.
|
|
*
|
|
* Creating a local scope Mutex will lock a UMutex, holding the lock until the Mutex
|
|
* goes out of scope.
|
|
*
|
|
* If no UMutex is specified, the ICU global mutex is implied.
|
|
*
|
|
* For example:
|
|
*
|
|
* static UMutex myMutex;
|
|
*
|
|
* void Function(int arg1, int arg2)
|
|
* {
|
|
* static Object* foo; // Shared read-write object
|
|
* Mutex mutex(&myMutex); // or no args for the global lock
|
|
* foo->Method();
|
|
* // When 'mutex' goes out of scope and gets destroyed here, the lock is released
|
|
* }
|
|
*
|
|
* Note: Do NOT use the form 'Mutex mutex();' as that merely forward-declares a function
|
|
* returning a Mutex. This is a common mistake which silently slips through the
|
|
* compiler!!
|
|
*/
|
|
|
|
class U_COMMON_API Mutex : public UMemory {
|
|
public:
|
|
Mutex(UMutex *mutex = nullptr) : fMutex(mutex) {
|
|
umtx_lock(fMutex);
|
|
}
|
|
~Mutex() {
|
|
umtx_unlock(fMutex);
|
|
}
|
|
|
|
Mutex(const Mutex &other) = delete; // forbid assigning of this class
|
|
Mutex &operator=(const Mutex &other) = delete; // forbid copying of this class
|
|
void *operator new(size_t s) = delete; // forbid heap allocation. Locals only.
|
|
|
|
private:
|
|
UMutex *fMutex;
|
|
};
|
|
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif //_MUTEX_
|
|
//eof
|