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//========================================================================
//
// GMutex.h
//
// Portable mutex macros.
// Portable atomic increment/decrement.
//
// Copyright 2002-2014 Glyph & Cog, LLC
//
//========================================================================
#ifndef GMUTEX_H
#define GMUTEX_H
#include <aconf.h>
#ifdef _WIN32
# include <windows.h>
# include <intrin.h>
#else
# include <pthread.h>
#endif
//------------------------------------------------------------------------
// GMutex
//------------------------------------------------------------------------
// Usage:
//
// GMutex m;
// gInitMutex(&m);
// ...
// gLockMutex(&m);
// ... critical section ...
// gUnlockMutex(&m);
// ...
// gDestroyMutex(&m);
#ifdef _WIN32
typedef CRITICAL_SECTION GMutex;
#define gInitMutex(m) InitializeCriticalSection(m)
#define gDestroyMutex(m) DeleteCriticalSection(m)
#define gLockMutex(m) EnterCriticalSection(m)
#define gUnlockMutex(m) LeaveCriticalSection(m)
#else // assume pthreads
typedef pthread_mutex_t GMutex;
#define gInitMutex(m) pthread_mutex_init(m, NULL)
#define gDestroyMutex(m) pthread_mutex_destroy(m)
#define gLockMutex(m) pthread_mutex_lock(m)
#define gUnlockMutex(m) pthread_mutex_unlock(m)
#endif
//------------------------------------------------------------------------
// atomic increment/decrement
//------------------------------------------------------------------------
// NB: this must be "long" to work on Windows
typedef long GAtomicCounter;
// Increment *counter by one and return the final value (after the
// increment).
static inline GAtomicCounter gAtomicIncrement(GAtomicCounter *counter) {
GAtomicCounter newVal;
#if defined(_WIN32)
newVal = _InterlockedIncrement(counter);
#elif defined(__GNUC__) || defined(__xlC__)
// __GNUC__ also covers LLVM/clang
newVal = __sync_add_and_fetch(counter, 1);
#elif defined(__SUNPRO_CC)
newVal = atomic_inc_ulong_nv((ulong_t *)counter);
#else
# error "gAtomicIncrement is not defined for this compiler/platform"
#endif
return newVal;
}
// Decrement *counter by one and return the final value (after the
// decrement).
static inline GAtomicCounter gAtomicDecrement(GAtomicCounter *counter) {
GAtomicCounter newVal;
#if defined(_WIN32)
newVal = _InterlockedDecrement(counter);
#elif defined(__GNUC__) || defined(__xlC__)
// __GNUC__ also covers LLVM/clang
newVal = __sync_sub_and_fetch(counter, 1);
#elif defined(__SUNPRO_CC)
newVal = atomic_dec_ulong_nv((ulong_t *)counter);
#else
# error "gAtomicDecrement is not defined for this compiler/platform"
#endif
return newVal;
}
#endif // GMUTEX_H
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