semaphore.cpp - mozsearch

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/*

* Semaphore

* (C) 2013 Joel Low

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/internal/semaphore.h>

// Based on code by Pierre Gaston (http://p9as.blogspot.com/2012/06/c11-semaphores.html)

namespace Botan {

void Semaphore::release(size_t n)

   for(size_t i = 0; i != n; ++i)

      std::lock_guard<std::mutex> lock(m_mutex);

      if(m_value++ < 0)

         ++m_wakeups;

         m_cond.notify_one();

void Semaphore::acquire()

   std::unique_lock<std::mutex> lock(m_mutex);

   if(m_value-- <= 0)

       m_cond.wait(lock, [this] { return m_wakeups > 0; });

       --m_wakeups;