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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 GrSingleOwner_DEFINED
#define GrSingleOwner_DEFINED
#include "include/core/SkTypes.h"
#ifdef SK_DEBUG
#include "include/private/SkMutex.h"
#include "include/private/SkThreadID.h"
#define GR_ASSERT_SINGLE_OWNER(obj) \
GrSingleOwner::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 GrSingleOwner {
public:
GrSingleOwner() : fOwner(kIllegalThreadID), fReentranceCount(0) {}
struct AutoEnforce {
AutoEnforce(GrSingleOwner* 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;
GrSingleOwner* 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 GR_ASSERT_SINGLE_OWNER(obj)
class GrSingleOwner {}; // Provide a no-op implementation so we can pass pointers to constructors
#endif
#endif
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