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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkMutex_win_DEFINED
#define SkMutex_win_DEFINED
/** Windows CriticalSection based mutex. */
#ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
# define WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
#endif
#ifndef NOMINMAX
# define NOMINMAX
# define NOMINMAX_WAS_LOCALLY_DEFINED
#endif
#
#include <windows.h>
#
#ifdef WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
# undef WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
# undef WIN32_LEAN_AND_MEAN
#endif
#ifdef NOMINMAX_WAS_LOCALLY_DEFINED
# undef NOMINMAX_WAS_LOCALLY_DEFINED
# undef NOMINMAX
#endif
// On Windows, SkBaseMutex and SkMutex are the same thing,
// we can't easily get rid of static initializers. However,
// we preserve the same inheritance pattern as other platforms
// so that we can forward-declare cleanly.
struct SkBaseMutex {
public:
SkBaseMutex() {
InitializeCriticalSection(&fStorage);
SkDEBUGCODE(fOwner = 0;)
}
~SkBaseMutex() {
SkASSERT(0 == fOwner);
DeleteCriticalSection(&fStorage);
}
void acquire() {
EnterCriticalSection(&fStorage);
SkDEBUGCODE(fOwner = GetCurrentThreadId();)
}
void release() {
this->assertHeld();
SkDEBUGCODE(fOwner = 0;)
LeaveCriticalSection(&fStorage);
}
void assertHeld() {
SkASSERT(GetCurrentThreadId() == fOwner);
}
protected:
CRITICAL_SECTION fStorage;
SkDEBUGCODE(DWORD fOwner;)
private:
SkBaseMutex(const SkBaseMutex&);
SkBaseMutex& operator=(const SkBaseMutex&);
};
class SkMutex : public SkBaseMutex { };
// Windows currently provides no documented means of POD initializing a CRITICAL_SECTION.
// As a result, it is illegal to SK_DECLARE_STATIC_MUTEX in a function.
#define SK_DECLARE_STATIC_MUTEX(name) namespace{} static SkBaseMutex name
#endif
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