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 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 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 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 int pthread_yield(void) { 93 sched_yield(); 94 return 0; 95 } 96 97 } // namespace 98 99 #endif // GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H 100
