/usr/include/root/TVirtualMutex.h is in libroot-core-dev 5.34.00-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Fons Rademakers 14/07/2002
/*************************************************************************
* Copyright (C) 1995-2002, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#ifndef ROOT_TVirtualMutex
#define ROOT_TVirtualMutex
//////////////////////////////////////////////////////////////////////////
// //
// TVirtualMutex //
// //
// This class implements a mutex interface. The actual work is done via //
// TMutex which is available as soon as the thread library is loaded. //
// //
//////////////////////////////////////////////////////////////////////////
#ifndef ROOT_TObject
#include "TObject.h"
#endif
class TVirtualMutex;
// Global mutex set in TThread::Init
R__EXTERN TVirtualMutex *gGlobalMutex;
class TVirtualMutex : public TObject {
public:
TVirtualMutex(Bool_t /* recursive */ = kFALSE) { }
virtual ~TVirtualMutex() { }
virtual Int_t Lock() = 0;
virtual Int_t TryLock() = 0;
virtual Int_t UnLock() = 0;
virtual Int_t CleanUp() = 0;
Int_t Acquire() { return Lock(); }
Int_t Release() { return UnLock(); }
virtual TVirtualMutex *Factory(Bool_t /*recursive*/ = kFALSE) = 0;
ClassDef(TVirtualMutex,0) // Virtual mutex lock class
};
//////////////////////////////////////////////////////////////////////////
// //
// TLockGuard //
// //
// This class provides mutex resource management in a guaranteed and //
// exception safe way. Use like this: //
// { //
// TLockGuard guard(mutex); //
// ... // do something //
// } //
// when guard goes out of scope the mutex is unlocked in the TLockGuard //
// destructor. The exception mechanism takes care of calling the dtors //
// of local objects so it is exception safe. //
// //
//////////////////////////////////////////////////////////////////////////
class TLockGuard {
private:
TVirtualMutex *fMutex;
TLockGuard(const TLockGuard&); // not implemented
TLockGuard& operator=(const TLockGuard&); // not implemented
public:
TLockGuard(TVirtualMutex *mutex)
: fMutex(mutex) { if (fMutex) fMutex->Lock(); }
virtual ~TLockGuard() { if (fMutex) fMutex->UnLock(); }
ClassDef(TLockGuard,0) // Exception safe locking/unlocking of mutex
};
// Zero overhead macros in case not compiled with thread support
#if defined (_REENTRANT) || defined (WIN32)
#define R__LOCKGUARD(mutex) TLockGuard _R__UNIQUE_(R__guard)(mutex)
#define R__LOCKGUARD2(mutex) \
if (gGlobalMutex && !mutex) { \
gGlobalMutex->Lock(); \
if (!mutex) \
mutex = gGlobalMutex->Factory(kTRUE); \
gGlobalMutex->UnLock(); \
} \
R__LOCKGUARD(mutex)
#else
#define R__LOCKGUARD(mutex) if (mutex) { }
#define R__LOCKGUARD2(mutex) if (mutex) { }
#endif
#endif
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