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// © 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
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