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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef skgpu_SingleOwner_DEFINED
#define skgpu_SingleOwner_DEFINED
#include "include/private/base/SkDebug.h" // IWYU pragma: keep
#if defined(SK_DEBUG)
#include "include/private/base/SkAssert.h"
#include "include/private/base/SkMutex.h"
#include "include/private/base/SkThreadAnnotations.h"
#include "include/private/base/SkThreadID.h"
#endif
namespace skgpu {
#if defined(SK_DEBUG)
#define SKGPU_ASSERT_SINGLE_OWNER(obj) \
skgpu::SingleOwner::AutoEnforce debug_SingleOwner(obj, __FILE__, __LINE__);
// This is a debug tool to verify an object is only being used from one thread at a time.
class SingleOwner {
public:
SingleOwner() : fOwner(kIllegalThreadID), fReentranceCount(0) {}
struct AutoEnforce {
AutoEnforce(SingleOwner* so, const char* file, int line)
: fFile(file), fLine(line), fSO(so) {
fSO->enter(file, line);
}
~AutoEnforce() { fSO->exit(fFile, fLine); }
const char* fFile;
int fLine;
SingleOwner* fSO;
};
private:
void enter(const char* file, int line) {
SkAutoMutexExclusive lock(fMutex);
SkThreadID self = SkGetThreadID();
SkASSERTF(fOwner == self || fOwner == kIllegalThreadID, "%s:%d Single owner failure.",
file, line);
fReentranceCount++;
fOwner = self;
}
void exit(const char* file, int line) {
SkAutoMutexExclusive lock(fMutex);
SkASSERTF(fOwner == SkGetThreadID(), "%s:%d Single owner failure.", file, line);
fReentranceCount--;
if (fReentranceCount == 0) {
fOwner = kIllegalThreadID;
}
}
SkMutex fMutex;
SkThreadID fOwner SK_GUARDED_BY(fMutex);
int fReentranceCount SK_GUARDED_BY(fMutex);
};
#else
#define SKGPU_ASSERT_SINGLE_OWNER(obj)
class SingleOwner {}; // Provide a no-op implementation so we can pass pointers to constructors
#endif
} // namespace skgpu
#endif
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