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/*
* Barrier
* (C) 2016 Joel Low
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_UTIL_BARRIER_H_
#define BOTAN_UTIL_BARRIER_H_
#include <botan/mutex.h>
#if defined(BOTAN_TARGET_OS_HAS_THREADS)
#include <condition_variable>
#endif
namespace Botan {
#if defined(BOTAN_TARGET_OS_HAS_THREADS)
// Barrier implements a barrier synchronization primitive. wait() will indicate
// how many threads to synchronize; each thread needing synchronization should
// call sync(). When sync() returns, the barrier is reset to zero, and the
// m_syncs counter is incremented. m_syncs is a counter to ensure that wait()
// can be called after a sync() even if the previously sleeping threads have
// not awoken.)
class Barrier final
{
public:
explicit Barrier(int value = 0) : m_value(value), m_syncs(0) {}
void wait(unsigned delta);
void sync();
private:
int m_value;
unsigned m_syncs;
mutex_type m_mutex;
std::condition_variable m_cond;
};
#endif
}
#endif
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