text: // Copyright (c) 2011,2015, Robert Escriva
  // 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 po6 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.
  
  // C
  #include <stdlib.h>
  
  // STL
  #include <stdexcept>
  
  // po6
  #include "po6/threads/cond.h"
  
  using po6::threads::cond;
  
  cond :: cond(mutex* mtx)
      : m_mtx(mtx)
      , m_cond()
  {
      int ret = pthread_cond_init(&m_cond, NULL);
  
      if (ret != 0)
      {
          abort();
      }
  }
  
  cond :: ~cond() throw ()
  {
      int ret = pthread_cond_destroy(&m_cond);
  
      if (ret != 0)
      {
          abort();
      }
  }
  
  void
  cond :: lock()
  {
      m_mtx->lock();
  }
  
  void
  cond :: unlock()
  {
      m_mtx->unlock();
  }
  
  void
  cond :: wait()
  {
      int ret = pthread_cond_wait(&m_cond, &m_mtx->m_mutex);
  
      if (ret != 0)
      {
          abort();
      }
  }
  
  void
  cond :: signal()
  {
      int ret = pthread_cond_signal(&m_cond);
  
      if (ret != 0)
      {
          abort();
      }
  }
  
  void
  cond :: broadcast()
  {
      int ret = pthread_cond_broadcast(&m_cond);
  
      if (ret != 0)
      {
          abort();
      }
  }
  