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// Copyright (C) 2007 Anthony Williams
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#define __STDC_CONSTANT_MACROS
#include <boost/thread/once.hpp>
#include <boost/assert.hpp>
#include <pthread.h>
#include <stdlib.h>
namespace boost
{
namespace detail
{
BOOST_THREAD_DECL boost::uintmax_t once_global_epoch=UINTMAX_C(~0);
BOOST_THREAD_DECL pthread_mutex_t once_epoch_mutex=PTHREAD_MUTEX_INITIALIZER;
BOOST_THREAD_DECL pthread_cond_t once_epoch_cv = PTHREAD_COND_INITIALIZER;
namespace
{
pthread_key_t epoch_tss_key;
pthread_once_t epoch_tss_key_flag=PTHREAD_ONCE_INIT;
extern "C" void delete_epoch_tss_data(void* data)
{
free(data);
}
extern "C" void create_epoch_tss_key()
{
BOOST_VERIFY(!pthread_key_create(&epoch_tss_key,delete_epoch_tss_data));
}
}
boost::uintmax_t& get_once_per_thread_epoch()
{
BOOST_VERIFY(!pthread_once(&epoch_tss_key_flag,create_epoch_tss_key));
void* data=pthread_getspecific(epoch_tss_key);
if(!data)
{
data=malloc(sizeof(boost::uintmax_t));
BOOST_VERIFY(!pthread_setspecific(epoch_tss_key,data));
*static_cast<boost::uintmax_t*>(data)=UINTMAX_C(~0);
}
return *static_cast<boost::uintmax_t*>(data);
}
}
}
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