1 // Copyright (c) 2012, Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 // * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 // * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30 // This contains Pthread-related functions not provided by the Android NDK
31 // but required by the Breakpad unit test. The functions are inlined here
32 // in a C++ anonymous namespace in order to keep the build files simples.
33
34 #ifndef GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H
35 #define GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H
36
37 #include <pthread.h>
38
39 namespace {
40
41 // Android doesn't provide pthread_barrier_t for now.
42 #ifndef PTHREAD_BARRIER_SERIAL_THREAD
43
44 // Anything except 0 will do here.
45 #define PTHREAD_BARRIER_SERIAL_THREAD 0x12345
46
47 typedef struct {
48 pthread_mutex_t mutex;
49 pthread_cond_t cond;
50 unsigned count;
51 } pthread_barrier_t;
52
pthread_barrier_init(pthread_barrier_t * barrier,const void *,unsigned count)53 int pthread_barrier_init(pthread_barrier_t* barrier,
54 const void* /* barrier_attr */,
55 unsigned count) {
56 barrier->count = count;
57 pthread_mutex_init(&barrier->mutex, NULL);
58 pthread_cond_init(&barrier->cond, NULL);
59 return 0;
60 }
61
pthread_barrier_wait(pthread_barrier_t * barrier)62 int pthread_barrier_wait(pthread_barrier_t* barrier) {
63 // Lock the mutex
64 pthread_mutex_lock(&barrier->mutex);
65 // Decrement the count. If this is the first thread to reach 0, wake up
66 // waiters, unlock the mutex, then return PTHREAD_BARRIER_SERIAL_THREAD.
67 if (--barrier->count == 0) {
68 // First thread to reach the barrier
69 pthread_cond_broadcast(&barrier->cond);
70 pthread_mutex_unlock(&barrier->mutex);
71 return PTHREAD_BARRIER_SERIAL_THREAD;
72 }
73 // Otherwise, wait for other threads until the count reaches 0, then
74 // return 0 to indicate this is not the first thread.
75 do {
76 pthread_cond_wait(&barrier->cond, &barrier->mutex);
77 } while (barrier->count > 0);
78
79 pthread_mutex_unlock(&barrier->mutex);
80 return 0;
81 }
82
pthread_barrier_destroy(pthread_barrier_t * barrier)83 int pthread_barrier_destroy(pthread_barrier_t *barrier) {
84 barrier->count = 0;
85 pthread_cond_destroy(&barrier->cond);
86 pthread_mutex_destroy(&barrier->mutex);
87 return 0;
88 }
89
90 #endif // defined(PTHREAD_BARRIER_SERIAL_THREAD)
91
92 } // namespace
93
94 #endif // GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H
95