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Issue 21087012: Simplify implementation of Mutex. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Fix unit test. Created 7 years, 4 months ago
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1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28 #include "mutex.h"
29
30 #include <errno.h>
31
32 #include "checks.h"
33
34 namespace v8 {
35 namespace internal {
36
37 #if V8_OS_UNIX
38
39 Mutex::Mutex() {
40 pthread_mutexattr_t attr;
41 int result = pthread_mutexattr_init(&attr);
42 ASSERT_EQ(0, result);
43 result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
44 ASSERT_EQ(0, result);
45 result = pthread_mutex_init(&mutex_, &attr);
46 ASSERT_EQ(0, result);
47 result = pthread_mutexattr_destroy(&attr);
48 ASSERT_EQ(0, result);
49 USE(result);
50 }
51
52
53 Mutex::~Mutex() {
54 pthread_mutex_destroy(&mutex_);
55 }
56
57
58 void Mutex::Lock() {
59 int result = pthread_mutex_lock(&mutex_);
60 ASSERT_EQ(0, result);
61 USE(result);
62 }
63
64
65 void Mutex::Unlock() {
66 int result = pthread_mutex_unlock(&mutex_);
67 ASSERT_EQ(0, result);
68 USE(result);
69 }
70
71
72 bool Mutex::TryLock() {
73 int result = pthread_mutex_trylock(&mutex_);
74 // Return false if the lock is busy and locking failed.
75 if (result == EBUSY) {
76 return false;
77 }
78 ASSERT_EQ(0, result);
79 return true;
80 }
81
82 #elif V8_OS_WIN32
83
84 Mutex::Mutex() {
85 InitializeCriticalSection(&cs_);
86 }
87
88
89 Mutex::~Mutex() {
90 DeleteCriticalSection(&cs_);
91 }
92
93
94 void Mutex::Lock() {
95 EnterCriticalSection(&cs_);
96 }
97
98
99 void Mutex::Unlock() {
100 LeaveCriticalSection(&cs_);
101 }
102
103
104 bool Mutex::TryLock() {
105 return TryEnterCriticalSection(&cs_);
106 }
107
108 #endif // V8_OS_WIN32
109
110 } } // namespace v8::internal
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