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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/base-export.h" |
8 #include "src/base/lazy-instance.h" | 9 #include "src/base/lazy-instance.h" |
9 #if V8_OS_WIN | 10 #if V8_OS_WIN |
10 #include "src/base/win32-headers.h" | 11 #include "src/base/win32-headers.h" |
11 #endif | 12 #endif |
12 | 13 |
13 #if V8_OS_MACOSX | 14 #if V8_OS_MACOSX |
14 #include <mach/semaphore.h> // NOLINT | 15 #include <mach/semaphore.h> // NOLINT |
15 #elif V8_OS_POSIX | 16 #elif V8_OS_POSIX |
16 #include <semaphore.h> // NOLINT | 17 #include <semaphore.h> // NOLINT |
17 #endif | 18 #endif |
18 | 19 |
19 namespace v8 { | 20 namespace v8 { |
20 namespace base { | 21 namespace base { |
21 | 22 |
22 // Forward declarations. | 23 // Forward declarations. |
23 class TimeDelta; | 24 class TimeDelta; |
24 | 25 |
25 // ---------------------------------------------------------------------------- | 26 // ---------------------------------------------------------------------------- |
26 // Semaphore | 27 // Semaphore |
27 // | 28 // |
28 // A semaphore object is a synchronization object that maintains a count. The | 29 // 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 | 30 // 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 | 31 // object and incremented each time a thread signals the semaphore. When the |
31 // count reaches zero, threads waiting for the semaphore blocks until the | 32 // count reaches zero, threads waiting for the semaphore blocks until the |
32 // count becomes non-zero. | 33 // count becomes non-zero. |
33 | 34 |
34 class Semaphore final { | 35 class V8_BASE_EXPORT Semaphore final { |
35 public: | 36 public: |
36 explicit Semaphore(int count); | 37 explicit Semaphore(int count); |
37 ~Semaphore(); | 38 ~Semaphore(); |
38 | 39 |
39 // Increments the semaphore counter. | 40 // Increments the semaphore counter. |
40 void Signal(); | 41 void Signal(); |
41 | 42 |
42 // Decrements the semaphore counter if it is positive, or blocks until it | 43 // Decrements the semaphore counter if it is positive, or blocks until it |
43 // becomes positive and then decrements the counter. | 44 // becomes positive and then decrements the counter. |
44 void Wait(); | 45 void Wait(); |
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92 typedef typename LazyDynamicInstance<Semaphore, CreateSemaphoreTrait<N>, | 93 typedef typename LazyDynamicInstance<Semaphore, CreateSemaphoreTrait<N>, |
93 ThreadSafeInitOnceTrait>::type type; | 94 ThreadSafeInitOnceTrait>::type type; |
94 }; | 95 }; |
95 | 96 |
96 #define LAZY_SEMAPHORE_INITIALIZER LAZY_DYNAMIC_INSTANCE_INITIALIZER | 97 #define LAZY_SEMAPHORE_INITIALIZER LAZY_DYNAMIC_INSTANCE_INITIALIZER |
97 | 98 |
98 } // namespace base | 99 } // namespace base |
99 } // namespace v8 | 100 } // namespace v8 |
100 | 101 |
101 #endif // V8_BASE_PLATFORM_SEMAPHORE_H_ | 102 #endif // V8_BASE_PLATFORM_SEMAPHORE_H_ |
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