1 | /* |
---|---|
2 | * Copyright 2015 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 SkMutex_DEFINED |
9 | #define SkMutex_DEFINED |
10 | |
11 | #include "include/core/SkTypes.h" |
12 | #include "include/private/SkMacros.h" |
13 | #include "include/private/SkSemaphore.h" |
14 | #include "include/private/SkThreadAnnotations.h" |
15 | #include "include/private/SkThreadID.h" |
16 | |
17 | class SK_CAPABILITY("mutex") SkMutex { |
18 | public: |
19 | constexpr SkMutex() = default; |
20 | |
21 | void acquire() SK_ACQUIRE() { |
22 | fSemaphore.wait(); |
23 | SkDEBUGCODE(fOwner = SkGetThreadID();) |
24 | } |
25 | |
26 | void release() SK_RELEASE_CAPABILITY() { |
27 | this->assertHeld(); |
28 | SkDEBUGCODE(fOwner = kIllegalThreadID;) |
29 | fSemaphore.signal(); |
30 | } |
31 | |
32 | void assertHeld() SK_ASSERT_CAPABILITY(this) { |
33 | SkASSERT(fOwner == SkGetThreadID()); |
34 | } |
35 | |
36 | private: |
37 | SkSemaphore fSemaphore{1}; |
38 | SkDEBUGCODE(SkThreadID fOwner{kIllegalThreadID};) |
39 | }; |
40 | |
41 | class SK_SCOPED_CAPABILITY SkAutoMutexExclusive { |
42 | public: |
43 | SkAutoMutexExclusive(SkMutex& mutex) SK_ACQUIRE(mutex) : fMutex(mutex) { fMutex.acquire(); } |
44 | ~SkAutoMutexExclusive() SK_RELEASE_CAPABILITY() { fMutex.release(); } |
45 | |
46 | private: |
47 | SkMutex& fMutex; |
48 | }; |
49 | |
50 | #define SkAutoMutexExclusive(...) SK_REQUIRE_LOCAL_VAR(SkAutoMutexExclusive) |
51 | |
52 | #endif // SkMutex_DEFINED |
53 |