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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
//----------------------------------------------------------------------------
// Code within that accesses shared static or global data should
// should instantiate a Mutex object while doing so. You should make your own
// private mutex where possible.
// For example:
//
// UMutex myMutex = U_MUTEX_INITIALIZER;
//
// 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:
inline Mutex(UMutex *mutex = NULL);
inline ~Mutex();
private:
UMutex *fMutex;
Mutex(const Mutex &other); // forbid copying of this class
Mutex &operator=(const Mutex &other); // forbid copying of this class
};
inline Mutex::Mutex(UMutex *mutex)
: fMutex(mutex)
{
umtx_lock(fMutex);
}
inline Mutex::~Mutex()
{
umtx_unlock(fMutex);
}
U_NAMESPACE_END
#endif //_MUTEX_
//eof
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