| 1 | /* |
|---|---|
| 2 | * Copyright 2016 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #ifndef skgpu_SingleOwner_DEFINED |
| 9 | #define skgpu_SingleOwner_DEFINED |
| 10 | |
| 11 | #include "include/private/base/SkDebug.h" // IWYU pragma: keep |
| 12 | |
| 13 | #if defined(SK_DEBUG) |
| 14 | #include "include/private/base/SkAssert.h" |
| 15 | #include "include/private/base/SkMutex.h" |
| 16 | #include "include/private/base/SkThreadAnnotations.h" |
| 17 | #include "include/private/base/SkThreadID.h" |
| 18 | |
| 19 | #endif |
| 20 | |
| 21 | namespace skgpu { |
| 22 | |
| 23 | #if defined(SK_DEBUG) |
| 24 | |
| 25 | #define SKGPU_ASSERT_SINGLE_OWNER(obj) \ |
| 26 | skgpu::SingleOwner::AutoEnforce debug_SingleOwner(obj, __FILE__, __LINE__); |
| 27 | |
| 28 | // This is a debug tool to verify an object is only being used from one thread at a time. |
| 29 | class SingleOwner { |
| 30 | public: |
| 31 | SingleOwner() : fOwner(kIllegalThreadID), fReentranceCount(0) {} |
| 32 | |
| 33 | struct AutoEnforce { |
| 34 | AutoEnforce(SingleOwner* so, const char* file, int line) |
| 35 | : fFile(file), fLine(line), fSO(so) { |
| 36 | fSO->enter(file, line); |
| 37 | } |
| 38 | ~AutoEnforce() { fSO->exit(file: fFile, line: fLine); } |
| 39 | |
| 40 | const char* fFile; |
| 41 | int fLine; |
| 42 | SingleOwner* fSO; |
| 43 | }; |
| 44 | |
| 45 | private: |
| 46 | void enter(const char* file, int line) { |
| 47 | SkAutoMutexExclusive lock(fMutex); |
| 48 | SkThreadID self = SkGetThreadID(); |
| 49 | SkASSERTF(fOwner == self || fOwner == kIllegalThreadID, "%s:%d Single owner failure.", |
| 50 | file, line); |
| 51 | fReentranceCount++; |
| 52 | fOwner = self; |
| 53 | } |
| 54 | |
| 55 | void exit(const char* file, int line) { |
| 56 | SkAutoMutexExclusive lock(fMutex); |
| 57 | SkASSERTF(fOwner == SkGetThreadID(), "%s:%d Single owner failure.", file, line); |
| 58 | fReentranceCount--; |
| 59 | if (fReentranceCount == 0) { |
| 60 | fOwner = kIllegalThreadID; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | SkMutex fMutex; |
| 65 | SkThreadID fOwner SK_GUARDED_BY(fMutex); |
| 66 | int fReentranceCount SK_GUARDED_BY(fMutex); |
| 67 | }; |
| 68 | #else |
| 69 | #define SKGPU_ASSERT_SINGLE_OWNER(obj) |
| 70 | class SingleOwner {}; // Provide a no-op implementation so we can pass pointers to constructors |
| 71 | #endif |
| 72 | |
| 73 | } // namespace skgpu |
| 74 | |
| 75 | #endif |
| 76 |