michael@0: // Copyright (c) 2012, Google Inc.
michael@0: // All rights reserved.
michael@0: //
michael@0: // Redistribution and use in source and binary forms, with or without
michael@0: // modification, are permitted provided that the following conditions are
michael@0: // met:
michael@0: //
michael@0: //     * Redistributions of source code must retain the above copyright
michael@0: // notice, this list of conditions and the following disclaimer.
michael@0: //     * Redistributions in binary form must reproduce the above
michael@0: // copyright notice, this list of conditions and the following disclaimer
michael@0: // in the documentation and/or other materials provided with the
michael@0: // distribution.
michael@0: //     * Neither the name of Google Inc. nor the names of its
michael@0: // contributors may be used to endorse or promote products derived from
michael@0: // this software without specific prior written permission.
michael@0: //
michael@0: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
michael@0: // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
michael@0: // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
michael@0: // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
michael@0: // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
michael@0: // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
michael@0: // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0: // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
michael@0: // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0: 
michael@0: // This contains Pthread-related functions not provided by the Android NDK
michael@0: // but required by the Breakpad unit test. The functions are inlined here
michael@0: // in a C++ anonymous namespace in order to keep the build files simples.
michael@0: 
michael@0: #ifndef GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H
michael@0: #define GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H
michael@0: 
michael@0: #include <pthread.h>
michael@0: 
michael@0: namespace {
michael@0: 
michael@0: // Android doesn't provide pthread_barrier_t for now.
michael@0: #ifndef PTHREAD_BARRIER_SERIAL_THREAD
michael@0: 
michael@0: // Anything except 0 will do here.
michael@0: #define PTHREAD_BARRIER_SERIAL_THREAD  0x12345
michael@0: 
michael@0: typedef struct {
michael@0:   pthread_mutex_t  mutex;
michael@0:   pthread_cond_t   cond;
michael@0:   unsigned         count;
michael@0: } pthread_barrier_t;
michael@0: 
michael@0: int pthread_barrier_init(pthread_barrier_t* barrier,
michael@0:                          const void* /* barrier_attr */,
michael@0:                          unsigned count) {
michael@0:   barrier->count = count;
michael@0:   pthread_mutex_init(&barrier->mutex, NULL);
michael@0:   pthread_cond_init(&barrier->cond, NULL);
michael@0:   return 0;
michael@0: }
michael@0: 
michael@0: int pthread_barrier_wait(pthread_barrier_t* barrier) {
michael@0:   // Lock the mutex
michael@0:   pthread_mutex_lock(&barrier->mutex);
michael@0:   // Decrement the count. If this is the first thread to reach 0, wake up
michael@0:   // waiters, unlock the mutex, then return PTHREAD_BARRIER_SERIAL_THREAD.
michael@0:   if (--barrier->count == 0) {
michael@0:     // First thread to reach the barrier
michael@0:     pthread_cond_broadcast(&barrier->cond);
michael@0:     pthread_mutex_unlock(&barrier->mutex);
michael@0:     return PTHREAD_BARRIER_SERIAL_THREAD;
michael@0:   }
michael@0:   // Otherwise, wait for other threads until the count reaches 0, then
michael@0:   // return 0 to indicate this is not the first thread.
michael@0:   do {
michael@0:     pthread_cond_wait(&barrier->cond, &barrier->mutex);
michael@0:   } while (barrier->count > 0);
michael@0: 
michael@0:   pthread_mutex_unlock(&barrier->mutex);
michael@0:   return 0;
michael@0: }
michael@0: 
michael@0: int pthread_barrier_destroy(pthread_barrier_t *barrier) {
michael@0:   barrier->count = 0;
michael@0:   pthread_cond_destroy(&barrier->cond);
michael@0:   pthread_mutex_destroy(&barrier->mutex);
michael@0:   return 0;
michael@0: }
michael@0: 
michael@0: #endif  // defined(PTHREAD_BARRIER_SERIAL_THREAD)
michael@0: 
michael@0: int pthread_yield(void) {
michael@0:   sched_yield();
michael@0:   return 0;
michael@0: }
michael@0: 
michael@0: }  // namespace
michael@0: 
michael@0: #endif  // GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H