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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_BASE_PLATFORM_SEMAPHORE_H_ | 5 #ifndef V8_BASE_PLATFORM_SEMAPHORE_H_ |
6 #define V8_BASE_PLATFORM_SEMAPHORE_H_ | 6 #define V8_BASE_PLATFORM_SEMAPHORE_H_ |
7 | 7 |
8 #include "src/base/lazy-instance.h" | 8 #include "src/base/lazy-instance.h" |
9 #if V8_OS_WIN | 9 #if V8_OS_WIN |
10 #include "src/base/win32-headers.h" | 10 #include "src/base/win32-headers.h" |
11 #endif | 11 #endif |
12 | 12 |
13 #if V8_OS_MACOSX | 13 #if V8_OS_MACOSX |
14 #include <mach/semaphore.h> // NOLINT | 14 #include <mach/semaphore.h> // NOLINT |
15 #elif V8_OS_POSIX | 15 #elif V8_OS_POSIX |
16 #include <semaphore.h> // NOLINT | 16 #include <semaphore.h> // NOLINT |
17 #endif | 17 #endif |
18 | 18 |
19 namespace v8 { | 19 namespace v8 { |
20 namespace base { | 20 namespace base { |
21 | 21 |
22 #if V8_OS_AIX | |
23 // On aix sem_t is of type int | |
24 const uintptr_t kSemaphoreAlignmentMask = sizeof(int) - 1; | |
jochen (gone - plz use gerrit)
2016/05/02 16:15:45
Any reason this is defined in the header?
| |
25 #else | |
26 const uintptr_t kSemaphoreAlignmentMask = sizeof(void*) - 1; | |
27 #endif | |
28 | |
22 // Forward declarations. | 29 // Forward declarations. |
23 class TimeDelta; | 30 class TimeDelta; |
24 | 31 |
25 // ---------------------------------------------------------------------------- | 32 // ---------------------------------------------------------------------------- |
26 // Semaphore | 33 // Semaphore |
27 // | 34 // |
28 // A semaphore object is a synchronization object that maintains a count. The | 35 // A semaphore object is a synchronization object that maintains a count. The |
29 // count is decremented each time a thread completes a wait for the semaphore | 36 // count is decremented each time a thread completes a wait for the semaphore |
30 // object and incremented each time a thread signals the semaphore. When the | 37 // object and incremented each time a thread signals the semaphore. When the |
31 // count reaches zero, threads waiting for the semaphore blocks until the | 38 // count reaches zero, threads waiting for the semaphore blocks until the |
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93 typedef typename LazyDynamicInstance<Semaphore, CreateSemaphoreTrait<N>, | 100 typedef typename LazyDynamicInstance<Semaphore, CreateSemaphoreTrait<N>, |
94 ThreadSafeInitOnceTrait>::type type; | 101 ThreadSafeInitOnceTrait>::type type; |
95 }; | 102 }; |
96 | 103 |
97 #define LAZY_SEMAPHORE_INITIALIZER LAZY_DYNAMIC_INSTANCE_INITIALIZER | 104 #define LAZY_SEMAPHORE_INITIALIZER LAZY_DYNAMIC_INSTANCE_INITIALIZER |
98 | 105 |
99 } // namespace base | 106 } // namespace base |
100 } // namespace v8 | 107 } // namespace v8 |
101 | 108 |
102 #endif // V8_BASE_PLATFORM_SEMAPHORE_H_ | 109 #endif // V8_BASE_PLATFORM_SEMAPHORE_H_ |
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