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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkMutex_DEFINED
#define SkMutex_DEFINED
#include "include/core/SkTypes.h"
#include "include/private/SkMacros.h"
#include "include/private/SkSemaphore.h"
#include "include/private/SkThreadAnnotations.h"
#include "include/private/SkThreadID.h"
class SK_CAPABILITY("mutex") SkMutex {
public:
constexpr SkMutex() = default;
void acquire() SK_ACQUIRE() {
fSemaphore.wait();
SkDEBUGCODE(fOwner = SkGetThreadID();)
}
void release() SK_RELEASE_CAPABILITY() {
this->assertHeld();
SkDEBUGCODE(fOwner = kIllegalThreadID;)
fSemaphore.signal();
}
void assertHeld() SK_ASSERT_CAPABILITY(this) {
SkASSERT(fOwner == SkGetThreadID());
}
private:
SkSemaphore fSemaphore{1};
SkDEBUGCODE(SkThreadID fOwner{kIllegalThreadID};)
};
class SK_SCOPED_CAPABILITY SkAutoMutexExclusive {
public:
SkAutoMutexExclusive(SkMutex& mutex) SK_ACQUIRE(mutex) : fMutex(mutex) { fMutex.acquire(); }
~SkAutoMutexExclusive() SK_RELEASE_CAPABILITY() { fMutex.release(); }
private:
SkMutex& fMutex;
};
#define SkAutoMutexExclusive(...) SK_REQUIRE_LOCAL_VAR(SkAutoMutexExclusive)
#endif // SkMutex_DEFINED
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