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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
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 #include "SkSharedMutex.h" | 8 #include "SkSharedMutex.h" |
9 | 9 |
10 #include "SkAtomics.h" | 10 #include "SkAtomics.h" |
11 #include "SkTypes.h" | 11 #include "SkTypes.h" |
12 #include "SkSemaphore.h" | 12 #include "SkSemaphore.h" |
13 | 13 |
14 #if defined(THREAD_SANITIZER) | 14 #if !defined(__has_feature) |
15 | 15 #define __has_feature(x) 0 |
16 /* Report that a lock has been created at address "lock". */ | |
17 #define ANNOTATE_RWLOCK_CREATE(lock) \ | |
18 AnnotateRWLockCreate(__FILE__, __LINE__, lock) | |
19 | |
20 /* Report that the lock at address "lock" is about to be destroyed. */ | |
21 #define ANNOTATE_RWLOCK_DESTROY(lock) \ | |
22 AnnotateRWLockDestroy(__FILE__, __LINE__, lock) | |
23 | |
24 /* Report that the lock at address "lock" has been acquired. | |
25 is_w=1 for writer lock, is_w=0 for reader lock. */ | |
26 #define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \ | |
27 AnnotateRWLockAcquired(__FILE__, __LINE__, lock, is_w) | |
28 | |
29 /* Report that the lock at address "lock" is about to be released. */ | |
30 #define ANNOTATE_RWLOCK_RELEASED(lock, is_w) \ | |
31 AnnotateRWLockReleased(__FILE__, __LINE__, lock, is_w) | |
32 | |
33 #ifdef DYNAMIC_ANNOTATIONS_WANT_ATTRIBUTE_WEAK | |
34 # ifdef __GNUC__ | |
35 # define DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK __attribute__((weak)) | |
36 # else | |
37 /* TODO(glider): for Windows support we may want to change this macro in order | |
38 to prepend __declspec(selectany) to the annotations' declarations. */ | |
39 # error weak annotations are not supported for your compiler | |
40 # endif | |
41 #else | |
42 # define DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK | |
43 #endif | 16 #endif |
44 | 17 |
45 extern "C" { | 18 #if __has_feature(thread_sanitizer) |
46 void AnnotateRWLockCreate( | 19 |
47 const char *file, int line, | 20 /* Report that a lock has been created at address "lock". */ |
48 const volatile void *lock) DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK; | 21 #define ANNOTATE_RWLOCK_CREATE(lock) \ |
49 void AnnotateRWLockDestroy( | 22 AnnotateRWLockCreate(__FILE__, __LINE__, lock) |
50 const char *file, int line, | 23 |
51 const volatile void *lock) DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK; | 24 /* Report that the lock at address "lock" is about to be destroyed. */ |
52 void AnnotateRWLockAcquired( | 25 #define ANNOTATE_RWLOCK_DESTROY(lock) \ |
53 const char *file, int line, | 26 AnnotateRWLockDestroy(__FILE__, __LINE__, lock) |
54 const volatile void *lock, long is_w) DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK; | 27 |
55 void AnnotateRWLockReleased( | 28 /* Report that the lock at address "lock" has been acquired. |
56 const char *file, int line, | 29 is_w=1 for writer lock, is_w=0 for reader lock. */ |
57 const volatile void *lock, long is_w) DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK; | 30 #define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \ |
58 } | 31 AnnotateRWLockAcquired(__FILE__, __LINE__, lock, is_w) |
| 32 |
| 33 /* Report that the lock at address "lock" is about to be released. */ |
| 34 #define ANNOTATE_RWLOCK_RELEASED(lock, is_w) \ |
| 35 AnnotateRWLockReleased(__FILE__, __LINE__, lock, is_w) |
| 36 |
| 37 #if defined(DYNAMIC_ANNOTATIONS_WANT_ATTRIBUTE_WEAK) |
| 38 #if defined(__GNUC__) |
| 39 #define DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK __attribute__((weak)) |
| 40 #else |
| 41 /* TODO(glider): for Windows support we may want to change this macr
o in order |
| 42 to prepend __declspec(selectany) to the annotations' declarations
. */ |
| 43 #error weak annotations are not supported for your compiler |
| 44 #endif |
| 45 #else |
| 46 #define DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK |
| 47 #endif |
| 48 |
| 49 extern "C" { |
| 50 void AnnotateRWLockCreate( |
| 51 const char *file, int line, |
| 52 const volatile void *lock) DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK; |
| 53 void AnnotateRWLockDestroy( |
| 54 const char *file, int line, |
| 55 const volatile void *lock) DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK; |
| 56 void AnnotateRWLockAcquired( |
| 57 const char *file, int line, |
| 58 const volatile void *lock, long is_w) DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK
; |
| 59 void AnnotateRWLockReleased( |
| 60 const char *file, int line, |
| 61 const volatile void *lock, long is_w) DYNAMIC_ANNOTATIONS_ATTRIBUTE_WEAK
; |
| 62 } |
59 | 63 |
60 #else | 64 #else |
61 | 65 |
62 #define ANNOTATE_RWLOCK_CREATE(lock) | 66 #define ANNOTATE_RWLOCK_CREATE(lock) |
63 #define ANNOTATE_RWLOCK_DESTROY(lock) | 67 #define ANNOTATE_RWLOCK_DESTROY(lock) |
64 #define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) | 68 #define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) |
65 #define ANNOTATE_RWLOCK_RELEASED(lock, is_w) | 69 #define ANNOTATE_RWLOCK_RELEASED(lock, is_w) |
66 | 70 |
67 #endif | 71 #endif |
68 | 72 |
69 #ifdef SK_DEBUG | 73 #ifdef SK_DEBUG |
70 | 74 |
71 #include "SkThreadID.h" | 75 #include "SkThreadID.h" |
72 #include "SkTDArray.h" | 76 #include "SkTDArray.h" |
73 | 77 |
74 class SkSharedMutex::ThreadIDSet { | 78 class SkSharedMutex::ThreadIDSet { |
75 public: | 79 public: |
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341 | 345 |
342 // If shared count is going to zero (because the old count == 1) and the
re are exclusive | 346 // If shared count is going to zero (because the old count == 1) and the
re are exclusive |
343 // waiters, then run a single exclusive waiter. | 347 // waiters, then run a single exclusive waiter. |
344 if (((oldQueueCounts & kSharedMask) >> kSharedOffset) == 1 | 348 if (((oldQueueCounts & kSharedMask) >> kSharedOffset) == 1 |
345 && (oldQueueCounts & kWaitingExclusiveMask) > 0) { | 349 && (oldQueueCounts & kWaitingExclusiveMask) > 0) { |
346 fExclusiveQueue.signal(); | 350 fExclusiveQueue.signal(); |
347 } | 351 } |
348 } | 352 } |
349 | 353 |
350 #endif | 354 #endif |
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