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75 lines
2.0 KiB
75 lines
2.0 KiB
////////////////////////////////////////////////////////////////////////////// |
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// |
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// (C) Copyright Ion Gaztanaga 2005-2009. Distributed under the Boost |
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// Software License, Version 1.0. (See accompanying file |
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/interprocess for documentation. |
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// |
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////////////////////////////////////////////////////////////////////////////// |
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#include<boost/interprocess/exceptions.hpp> |
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#include <boost/interprocess/detail/posix_time_types_wrk.hpp> |
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namespace boost { |
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namespace interprocess { |
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inline interprocess_semaphore::~interprocess_semaphore() |
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{} |
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inline interprocess_semaphore::interprocess_semaphore(unsigned int initialCount) |
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{ ipcdetail::atomic_write32(&this->m_count, boost::uint32_t(initialCount)); } |
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inline void interprocess_semaphore::post() |
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{ |
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ipcdetail::atomic_inc32(&m_count); |
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} |
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inline void interprocess_semaphore::wait() |
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{ |
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while(!ipcdetail::atomic_add_unless32(&m_count, boost::uint32_t(-1), boost::uint32_t(0))){ |
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while(ipcdetail::atomic_read32(&m_count) == 0){ |
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ipcdetail::thread_yield(); |
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} |
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} |
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} |
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inline bool interprocess_semaphore::try_wait() |
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{ |
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return ipcdetail::atomic_add_unless32(&m_count, boost::uint32_t(-1), boost::uint32_t(0)); |
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} |
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inline bool interprocess_semaphore::timed_wait(const boost::posix_time::ptime &abs_time) |
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{ |
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if(abs_time == boost::posix_time::pos_infin){ |
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this->wait(); |
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return true; |
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} |
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//Obtain current count and target time |
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boost::posix_time::ptime now(microsec_clock::universal_time()); |
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if(now >= abs_time) |
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return false; |
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do{ |
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if(this->try_wait()){ |
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break; |
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} |
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now = microsec_clock::universal_time(); |
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if(now >= abs_time){ |
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return this->try_wait(); |
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} |
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// relinquish current time slice |
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ipcdetail::thread_yield(); |
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}while (true); |
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return true; |
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} |
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/* |
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inline int interprocess_semaphore::get_count() const |
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{ |
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return (int)ipcdetail::atomic_read32(&m_count); |
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}*/ |
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} //namespace interprocess { |
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} //namespace boost {
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