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 // Copyright (c) 2012, Google Inc.

 // All rights reserved.

 //

 // Redistribution and use in source and binary forms, with or without

 // modification, are permitted provided that the following conditions are

 // met:

 //

 //     * Redistributions of source code must retain the above copyright

 // notice, this list of conditions and the following disclaimer.

 //     * Redistributions in binary form must reproduce the above

 // copyright notice, this list of conditions and the following disclaimer

 // in the documentation and/or other materials provided with the

 // distribution.

 //     * Neither the name of Google Inc. nor the names of its

 // contributors may be used to endorse or promote products derived from

 // this software without specific prior written permission.

 //

 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 // This contains Pthread-related functions not provided by the Android NDK

 // but required by the Breakpad unit test. The functions are inlined here

 // in a C++ anonymous namespace in order to keep the build files simples.

 #ifndef GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H

 #define GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H

 #include <pthread.h>

 namespace {

 // Android doesn't provide pthread_barrier_t for now.

 #ifndef PTHREAD_BARRIER_SERIAL_THREAD

 // Anything except 0 will do here.

 #define PTHREAD_BARRIER_SERIAL_THREAD  0x12345

 typedef struct {

   pthread_mutex_t  mutex;

   pthread_cond_t   cond;

   unsigned         count;

 } pthread_barrier_t;

 int pthread_barrier_init(pthread_barrier_t* barrier,

                          const void* /* barrier_attr */,

                          unsigned count) {

   barrier->count = count;

   pthread_mutex_init(&barrier->mutex, NULL);

   pthread_cond_init(&barrier->cond, NULL);

   return 0;

 }

 int pthread_barrier_wait(pthread_barrier_t* barrier) {

   // Lock the mutex

   pthread_mutex_lock(&barrier->mutex);

   // Decrement the count. If this is the first thread to reach 0, wake up

   // waiters, unlock the mutex, then return PTHREAD_BARRIER_SERIAL_THREAD.

   if (--barrier->count == 0) {

     // First thread to reach the barrier

     pthread_cond_broadcast(&barrier->cond);

     pthread_mutex_unlock(&barrier->mutex);

     return PTHREAD_BARRIER_SERIAL_THREAD;

   }

   // Otherwise, wait for other threads until the count reaches 0, then

   // return 0 to indicate this is not the first thread.

   do {

     pthread_cond_wait(&barrier->cond, &barrier->mutex);

   } while (barrier->count > 0);

   pthread_mutex_unlock(&barrier->mutex);

   return 0;

 }

 int pthread_barrier_destroy(pthread_barrier_t *barrier) {

   barrier->count = 0;

   pthread_cond_destroy(&barrier->cond);

   pthread_mutex_destroy(&barrier->mutex);

   return 0;

 }

 #endif  // defined(PTHREAD_BARRIER_SERIAL_THREAD)

 int pthread_yield(void) {

   sched_yield();

   return 0;

 }

 }  // namespace

 #endif  // GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_PTHREAD_FIXES_H