#ifndef BOOST_THREAD_PTHREAD_MUTEX_HPP #define BOOST_THREAD_PTHREAD_MUTEX_HPP // (C) Copyright 2007-8 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) #include <pthread.h> #include <boost/utility.hpp> #include <boost/throw_exception.hpp> #include <boost/thread/exceptions.hpp> #include <boost/thread/locks.hpp> #include <boost/thread/thread_time.hpp> #include <boost/thread/xtime.hpp> #include <boost/assert.hpp> #include <errno.h> #include "timespec.hpp" #include "pthread_mutex_scoped_lock.hpp" #ifdef _POSIX_TIMEOUTS #if _POSIX_TIMEOUTS >= 0 #define BOOST_PTHREAD_HAS_TIMEDLOCK #endif #endif #include <boost/config/abi_prefix.hpp> namespace boost { class mutex: boost::noncopyable { private: pthread_mutex_t m; public: mutex() { int const res=pthread_mutex_init(&m,NULL); if(res) { boost::throw_exception(thread_resource_error()); } } ~mutex() { BOOST_VERIFY(!pthread_mutex_destroy(&m)); } void lock() { BOOST_VERIFY(!pthread_mutex_lock(&m)); } void unlock() { BOOST_VERIFY(!pthread_mutex_unlock(&m)); } bool try_lock() { int const res=pthread_mutex_trylock(&m); BOOST_ASSERT(!res || res==EBUSY); return !res; } typedef pthread_mutex_t* native_handle_type; native_handle_type native_handle() { return &m; } typedef unique_lock<mutex> scoped_lock; typedef detail::try_lock_wrapper<mutex> scoped_try_lock; }; typedef mutex try_mutex; class timed_mutex: boost::noncopyable { private: pthread_mutex_t m; #ifndef BOOST_PTHREAD_HAS_TIMEDLOCK pthread_cond_t cond; bool is_locked; #endif public: timed_mutex() { int const res=pthread_mutex_init(&m,NULL); if(res) { boost::throw_exception(thread_resource_error()); } #ifndef BOOST_PTHREAD_HAS_TIMEDLOCK int const res2=pthread_cond_init(&cond,NULL); if(res2) { BOOST_VERIFY(!pthread_mutex_destroy(&m)); boost::throw_exception(thread_resource_error()); } is_locked=false; #endif } ~timed_mutex() { BOOST_VERIFY(!pthread_mutex_destroy(&m)); #ifndef BOOST_PTHREAD_HAS_TIMEDLOCK BOOST_VERIFY(!pthread_cond_destroy(&cond)); #endif } template<typename TimeDuration> bool timed_lock(TimeDuration const & relative_time) { return timed_lock(get_system_time()+relative_time); } bool timed_lock(boost::xtime const & absolute_time) { return timed_lock(system_time(absolute_time)); } #ifdef BOOST_PTHREAD_HAS_TIMEDLOCK void lock() { BOOST_VERIFY(!pthread_mutex_lock(&m)); } void unlock() { BOOST_VERIFY(!pthread_mutex_unlock(&m)); } bool try_lock() { int const res=pthread_mutex_trylock(&m); BOOST_ASSERT(!res || res==EBUSY); return !res; } bool timed_lock(system_time const & abs_time) { struct timespec const timeout=detail::get_timespec(abs_time); int const res=pthread_mutex_timedlock(&m,&timeout); BOOST_ASSERT(!res || res==ETIMEDOUT); return !res; } typedef pthread_mutex_t* native_handle_type; native_handle_type native_handle() { return &m; } #else void lock() { boost::pthread::pthread_mutex_scoped_lock const local_lock(&m); while(is_locked) { BOOST_VERIFY(!pthread_cond_wait(&cond,&m)); } is_locked=true; } void unlock() { boost::pthread::pthread_mutex_scoped_lock const local_lock(&m); is_locked=false; BOOST_VERIFY(!pthread_cond_signal(&cond)); } bool try_lock() { boost::pthread::pthread_mutex_scoped_lock const local_lock(&m); if(is_locked) { return false; } is_locked=true; return true; } bool timed_lock(system_time const & abs_time) { struct timespec const timeout=detail::get_timespec(abs_time); boost::pthread::pthread_mutex_scoped_lock const local_lock(&m); while(is_locked) { int const cond_res=pthread_cond_timedwait(&cond,&m,&timeout); if(cond_res==ETIMEDOUT) { return false; } BOOST_ASSERT(!cond_res); } is_locked=true; return true; } #endif typedef unique_lock<timed_mutex> scoped_timed_lock; typedef detail::try_lock_wrapper<timed_mutex> scoped_try_lock; typedef scoped_timed_lock scoped_lock; }; } #include <boost/config/abi_suffix.hpp> #endif