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1 /* | 1 /* |
2 * Copyright 2006 The Android Open Source Project | 2 * Copyright 2006 The Android Open Source Project |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkThread_DEFINED | 8 #ifndef SkThread_DEFINED |
9 #define SkThread_DEFINED | 9 #define SkThread_DEFINED |
10 | 10 |
11 #include "SkTypes.h" | 11 #include "SkTypes.h" |
12 | 12 |
13 // SK_ATOMICS_PLATFORM_H must provide inline implementations for the following d
eclarations. | 13 // SkAtomics.h must provide inline implementations for the following declaration
s. |
14 | 14 |
15 /** Atomically adds one to the int referenced by addr and returns the previous v
alue. | 15 /** Atomically adds one to the int referenced by addr and returns the previous v
alue. |
16 * No additional memory barrier is required; this must act as a compiler barrie
r. | 16 * No additional memory barrier is required; this must act as a compiler barrie
r. |
17 */ | 17 */ |
18 static int32_t sk_atomic_inc(int32_t* addr); | 18 static int32_t sk_atomic_inc(int32_t* addr); |
19 static int64_t sk_atomic_inc(int64_t* addr); | 19 static int64_t sk_atomic_inc(int64_t* addr); |
20 | 20 |
21 /** Atomically adds inc to the int referenced by addr and returns the previous v
alue. | 21 /** Atomically adds inc to the int referenced by addr and returns the previous v
alue. |
22 * No additional memory barrier is required; this must act as a compiler barrie
r. | 22 * No additional memory barrier is required; this must act as a compiler barrie
r. |
23 */ | 23 */ |
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37 /** If sk_atomic_dec does not act as an acquire (L/SL) barrier, | 37 /** If sk_atomic_dec does not act as an acquire (L/SL) barrier, |
38 * this must act as an acquire (L/SL) memory barrier and as a compiler barrier. | 38 * this must act as an acquire (L/SL) memory barrier and as a compiler barrier. |
39 */ | 39 */ |
40 static void sk_membar_acquire__after_atomic_dec(); | 40 static void sk_membar_acquire__after_atomic_dec(); |
41 | 41 |
42 /** If sk_atomic_conditional_inc does not act as an acquire (L/SL) barrier, | 42 /** If sk_atomic_conditional_inc does not act as an acquire (L/SL) barrier, |
43 * this must act as an acquire (L/SL) memory barrier and as a compiler barrier. | 43 * this must act as an acquire (L/SL) memory barrier and as a compiler barrier. |
44 */ | 44 */ |
45 static void sk_membar_acquire__after_atomic_conditional_inc(); | 45 static void sk_membar_acquire__after_atomic_conditional_inc(); |
46 | 46 |
47 #ifdef GOOGLE3 | 47 #include "SkAtomics.h" |
48 #include "SkAtomics_sync.h" | |
49 #else | |
50 #include SK_ATOMICS_PLATFORM_H | |
51 #endif | |
52 | 48 |
53 /** Atomically adds one to the int referenced by addr iff the referenced int was
not 0 | 49 /** Atomically adds one to the int referenced by addr iff the referenced int was
not 0 |
54 * and returns the previous value. | 50 * and returns the previous value. |
55 * No additional memory barrier is required; this must act as a compiler barrie
r. | 51 * No additional memory barrier is required; this must act as a compiler barrie
r. |
56 */ | 52 */ |
57 template<typename INT_TYPE> static inline INT_TYPE sk_atomic_conditional_inc(INT
_TYPE* addr) { | 53 template<typename INT_TYPE> static inline INT_TYPE sk_atomic_conditional_inc(INT
_TYPE* addr) { |
58 INT_TYPE prev; | 54 INT_TYPE prev; |
59 do { | 55 do { |
60 prev = *addr; | 56 prev = *addr; |
61 if (0 == prev) { | 57 if (0 == prev) { |
62 break; | 58 break; |
63 } | 59 } |
64 } while (!sk_atomic_cas(addr, prev, prev+1)); | 60 } while (!sk_atomic_cas(addr, prev, prev+1)); |
65 return prev; | 61 return prev; |
66 } | 62 } |
67 | 63 |
68 // SK_BARRIERS_PLATFORM_H must provide implementations for the following declara
tions: | 64 // SkBarriers.h must provide implementations for the following declarations: |
69 | 65 |
70 /** Prevent the compiler from reordering across this barrier. */ | 66 /** Prevent the compiler from reordering across this barrier. */ |
71 static void sk_compiler_barrier(); | 67 static void sk_compiler_barrier(); |
72 | 68 |
73 /** Read T*, with at least an acquire barrier. | 69 /** Read T*, with at least an acquire barrier. |
74 * | 70 * |
75 * Only needs to be implemented for T which can be atomically read. | 71 * Only needs to be implemented for T which can be atomically read. |
76 */ | 72 */ |
77 template <typename T> T sk_acquire_load(T*); | 73 template <typename T> T sk_acquire_load(T*); |
78 | 74 |
79 /** Write T*, with at least a release barrier. | 75 /** Write T*, with at least a release barrier. |
80 * | 76 * |
81 * Only needs to be implemented for T which can be atomically written. | 77 * Only needs to be implemented for T which can be atomically written. |
82 */ | 78 */ |
83 template <typename T> void sk_release_store(T*, T); | 79 template <typename T> void sk_release_store(T*, T); |
84 | 80 |
85 #ifdef GOOGLE3 | 81 #include "SkBarriers.h" |
86 #include "SkBarriers_x86.h" | |
87 #else | |
88 #include SK_BARRIERS_PLATFORM_H | |
89 #endif | |
90 | 82 |
91 /** SK_MUTEX_PLATFORM_H must provide the following (or equivalent) declarations. | 83 /** SkMutex.h must provide the following (or equivalent) declarations. |
92 | 84 |
93 class SkBaseMutex { | 85 class SkBaseMutex { |
94 public: | 86 public: |
95 void acquire(); // Block until this thread owns the mutex. | 87 void acquire(); // Block until this thread owns the mutex. |
96 void release(); // Assuming this thread owns the mutex, release it. | 88 void release(); // Assuming this thread owns the mutex, release it. |
97 void assertHeld(); // If SK_DEBUG, assert this thread owns the mutex. | 89 void assertHeld(); // If SK_DEBUG, assert this thread owns the mutex. |
98 }; | 90 }; |
99 | 91 |
100 class SkMutex : SkBaseMutex { | 92 class SkMutex : SkBaseMutex { |
101 public: | 93 public: |
102 SkMutex(); | 94 SkMutex(); |
103 ~SkMutex(); | 95 ~SkMutex(); |
104 }; | 96 }; |
105 | 97 |
106 #define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = ... | 98 #define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = ... |
107 */ | 99 */ |
108 | 100 |
109 #ifdef GOOGLE3 | 101 #include "SkMutex.h" |
110 #include "SkMutex_pthread.h" | |
111 #else | |
112 #include SK_MUTEX_PLATFORM_H | |
113 #endif | |
114 | |
115 | 102 |
116 class SkAutoMutexAcquire : SkNoncopyable { | 103 class SkAutoMutexAcquire : SkNoncopyable { |
117 public: | 104 public: |
118 explicit SkAutoMutexAcquire(SkBaseMutex& mutex) : fMutex(&mutex) { | 105 explicit SkAutoMutexAcquire(SkBaseMutex& mutex) : fMutex(&mutex) { |
119 SkASSERT(fMutex != NULL); | 106 SkASSERT(fMutex != NULL); |
120 mutex.acquire(); | 107 mutex.acquire(); |
121 } | 108 } |
122 | 109 |
123 explicit SkAutoMutexAcquire(SkBaseMutex* mutex) : fMutex(mutex) { | 110 explicit SkAutoMutexAcquire(SkBaseMutex* mutex) : fMutex(mutex) { |
124 if (mutex) { | 111 if (mutex) { |
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146 SkASSERT(fMutex); | 133 SkASSERT(fMutex); |
147 fMutex->assertHeld(); | 134 fMutex->assertHeld(); |
148 } | 135 } |
149 | 136 |
150 private: | 137 private: |
151 SkBaseMutex* fMutex; | 138 SkBaseMutex* fMutex; |
152 }; | 139 }; |
153 #define SkAutoMutexAcquire(...) SK_REQUIRE_LOCAL_VAR(SkAutoMutexAcquire) | 140 #define SkAutoMutexAcquire(...) SK_REQUIRE_LOCAL_VAR(SkAutoMutexAcquire) |
154 | 141 |
155 #endif | 142 #endif |
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