1de610a528
This is so Gpu code can guard against improper multithreaded usage in debug builds TBR=bsalomon@google.com BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1555953004 Review URL: https://codereview.chromium.org/1555953004
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrSingleOwner_DEFINED
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#define GrSingleOwner_DEFINED
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#include "SkTypes.h"
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#ifdef SK_DEBUG
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#include "SkMutex.h"
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#include "SkThreadID.h"
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// This is a debug tool to verify an object is only being used from one thread at a time.
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class GrSingleOwner {
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public:
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GrSingleOwner() : fOwner(kIllegalThreadID), fReentranceCount(0) {}
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struct AutoEnforce {
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AutoEnforce(GrSingleOwner* so) : fSO(so) { fSO->enter(); }
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~AutoEnforce() { fSO->exit(); }
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GrSingleOwner* fSO;
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};
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private:
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void enter() {
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SkAutoMutexAcquire lock(fMutex);
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SkThreadID self = SkGetThreadID();
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SkASSERT(fOwner == self || fOwner == kIllegalThreadID);
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fReentranceCount++;
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fOwner = self;
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}
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void exit() {
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SkAutoMutexAcquire lock(fMutex);
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fReentranceCount--;
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if (fReentranceCount == 0) {
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fOwner = kIllegalThreadID;
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}
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}
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SkMutex fMutex;
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SkThreadID fOwner; // guarded by fMutex
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int fReentranceCount; // guarded by fMutex
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};
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#endif
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#endif
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