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代码的名称是read_write_mutex.h这个代码可用#xff0c;但是未优化#xff0c;还存在冗余的代码如果涉及到进程挂掉了#xff0c;造成进程堵塞#xff0c;如何解决#xff1f;还未涉及
//#ifndef BOOST_THREAD_PTHREAD_SHARED_MUTEX_HPP
#define BOOST_THREAD_PTHR…代码
代码的名称是read_write_mutex.h这个代码可用但是未优化还存在冗余的代码如果涉及到进程挂掉了造成进程堵塞如何解决还未涉及
//#ifndef BOOST_THREAD_PTHREAD_SHARED_MUTEX_HPP
#define BOOST_THREAD_PTHREAD_SHARED_MUTEX_HPP// (C) Copyright 2006-8 Anthony Williams
// (C) Copyright 2012 Vicente J. Botet Escriba
//
// 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 boost/assert.hpp
#include boost/static_assert.hpp
#include boost/thread/mutex.hpp
#include boost/thread/condition_variable.hpp
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
#include boost/thread/detail/thread_interruption.hpp
#endif
#ifdef BOOST_THREAD_USES_CHRONO
#include boost/chrono/system_clocks.hpp
#include boost/chrono/ceil.hpp
#endif
#include boost/thread/detail/delete.hpp
#include boost/assert.hpp#include boost/config/abi_prefix.hpp
#include boost/interprocess/sync/named_mutex.hpp
#include boost/interprocess/sync/named_condition.hppnamespace bip boost::interprocess;
namespace chy
{class shared_mutex{private:class state_data{public:state_data () :shared_count(0),exclusive(false),upgrade(false),exclusive_waiting_blocked(false){}void assert_free() const{BOOST_ASSERT( ! exclusive );BOOST_ASSERT( ! upgrade );BOOST_ASSERT( shared_count0 );}void assert_locked() const{BOOST_ASSERT( exclusive );BOOST_ASSERT( shared_count0 );BOOST_ASSERT( ! upgrade );}void assert_lock_shared () const{BOOST_ASSERT( ! exclusive );BOOST_ASSERT( shared_count0 );//BOOST_ASSERT( (! upgrade) || (shared_count1));// if upgraded there are at least 2 threads sharing the mutex,// except when unlock_upgrade_and_lock has decreased the number of readers but has not taken yet exclusive ownership.}void assert_lock_upgraded () const{BOOST_ASSERT( ! exclusive );BOOST_ASSERT( upgrade );BOOST_ASSERT( shared_count0 );}void assert_lock_not_upgraded () const{BOOST_ASSERT( ! upgrade );}bool can_lock () const{return ! (shared_count || exclusive);}void exclusive_blocked (bool blocked){exclusive_waiting_blocked blocked;}void lock (){exclusive true;}void unlock (){exclusive false;exclusive_waiting_blocked false;}bool can_lock_shared () const{return ! (exclusive || exclusive_waiting_blocked);}bool more_shared () const{return shared_count 0 ;}unsigned get_shared_count () const{return shared_count ;}unsigned lock_shared (){return shared_count;}void unlock_shared (){--shared_count;}bool unlock_shared_downgrades(){if (upgrade) {upgradefalse;exclusivetrue;return true;} else {exclusive_waiting_blockedfalse;return false;}}void lock_upgrade (){shared_count;upgradetrue;}bool can_lock_upgrade () const{return ! (exclusive || exclusive_waiting_blocked || upgrade);}void unlock_upgrade (){upgradefalse;--shared_count;}//private:unsigned shared_count;bool exclusive;bool upgrade;bool exclusive_waiting_blocked;};state_data state;
// boost::mutex state_change;bip::named_mutex state_change{bip::open_or_create,mutex};
// boost::condition_variable shared_cond;bip::named_condition shared_cond{bip::open_or_create,read};
// boost::condition_variable exclusive_cond;bip::named_condition exclusive_cond{bip::open_or_create,write};boost::condition_variable upgrade_cond;void release_waiters(){exclusive_cond.notify_one();shared_cond.notify_all();}public:BOOST_THREAD_NO_COPYABLE(shared_mutex)shared_mutex(){}~shared_mutex(){}void lock_shared(){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);
// boost::unique_lockbip::named_mutexlk(state_change);boost::unique_lockbip::named_mutex lk(state_change);while(!state.can_lock_shared()){shared_cond.wait(lk);}state.lock_shared();}bool try_lock_shared(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);if(!state.can_lock_shared()){return false;}state.lock_shared();return true;}//#if defined BOOST_THREAD_USES_DATETIME
// bool timed_lock_shared(boost::system_time const timeout)
// {
//#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
// boost::this_thread::disable_interruption do_not_disturb;
//#endifboost::unique_lockboost::mutex lk(state_change);
// boost::unique_lockbip::named_mutexlk(state_change);
//
// while(!state.can_lock_shared())
// {
// if(!shared_cond.timed_wait(lk,timeout))
// {
// return false;
// }
// }
// state.lock_shared();
// return true;
// }// templatetypename TimeDuration
// bool timed_lock_shared(TimeDuration const relative_time)
// {
// return timed_lock_shared(boost::get_system_time()relative_time);
// }
//#endif
#ifdef BOOST_THREAD_USES_CHRONOtemplate class Rep, class Periodbool try_lock_shared_for(const boost::chrono::durationRep, Period rel_time){return try_lock_shared_until(boost::chrono::steady_clock::now() rel_time);}template class Clock, class Durationbool try_lock_shared_until(const boost::chrono::time_pointClock, Duration abs_time){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);while(!state.can_lock_shared())//while(state.exclusive || state.exclusive_waiting_blocked){
// if(boost::cv_status::timeoutshared_cond.wait_until(lk,abs_time))
// {
// return false;
// }}state.lock_shared();return true;}
#endifvoid unlock_shared(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);state.assert_lock_shared();state.unlock_shared();if (! state.more_shared()){if (state.upgrade){// As there is a thread doing a unlock_upgrade_and_lock that is waiting for ! state.more_shared()// avoid other threads to lock, lock_upgrade or lock_shared, so only this thread is notified.state.upgradefalse;state.exclusivetrue;//lk.unlock();upgrade_cond.notify_one();}else{state.exclusive_waiting_blockedfalse;//lk.unlock();}release_waiters();}}void lock(){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);while (state.shared_count || state.exclusive){state.exclusive_waiting_blockedtrue;exclusive_cond.wait(lk);}state.exclusivetrue;}#if defined BOOST_THREAD_USES_DATETIMEbool timed_lock(boost::system_time const timeout){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);while(state.shared_count || state.exclusive){state.exclusive_waiting_blockedtrue;if(!exclusive_cond.timed_wait(lk,timeout)){if(state.shared_count || state.exclusive){state.exclusive_waiting_blockedfalse;release_waiters();return false;}break;}}state.exclusivetrue;return true;}templatetypename TimeDurationbool timed_lock(TimeDuration const relative_time){return timed_lock(boost::get_system_time()relative_time);}
#endif
#ifdef BOOST_THREAD_USES_CHRONOtemplate class Rep, class Periodbool try_lock_for(const boost::chrono::durationRep, Period rel_time){return try_lock_until(boost::chrono::steady_clock::now() rel_time);}template class Clock, class Durationbool try_lock_until(const boost::chrono::time_pointClock, Duration abs_time){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);while(state.shared_count || state.exclusive){state.exclusive_waiting_blockedtrue;
// if(boost::cv_status::timeout exclusive_cond.wait_until(lk,abs_time))
// {
// if(state.shared_count || state.exclusive)
// {
// state.exclusive_waiting_blockedfalse;
// release_waiters();
// return false;
// }
// break;
// }}state.exclusivetrue;return true;}
#endifbool try_lock(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);if(state.shared_count || state.exclusive){return false;}else{state.exclusivetrue;return true;}}void unlock(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);state.assert_locked();state.exclusivefalse;state.exclusive_waiting_blockedfalse;state.assert_free();release_waiters();}void lock_upgrade(){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);while(state.exclusive || state.exclusive_waiting_blocked || state.upgrade){shared_cond.wait(lk);}state.lock_shared();state.upgradetrue;}#if defined BOOST_THREAD_USES_DATETIMEbool timed_lock_upgrade(boost::system_time const timeout){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);while(state.exclusive || state.exclusive_waiting_blocked || state.upgrade){if(!shared_cond.timed_wait(lk,timeout)){if(state.exclusive || state.exclusive_waiting_blocked || state.upgrade){return false;}break;}}state.lock_shared();state.upgradetrue;return true;}templatetypename TimeDurationbool timed_lock_upgrade(TimeDuration const relative_time){return timed_lock_upgrade(boost::get_system_time()relative_time);}
#endif
#ifdef BOOST_THREAD_USES_CHRONOtemplate class Rep, class Periodbool try_lock_upgrade_for(const boost::chrono::durationRep, Period rel_time){return try_lock_upgrade_until(boost::chrono::steady_clock::now() rel_time);}template class Clock, class Durationbool try_lock_upgrade_until(const boost::chrono::time_pointClock, Duration abs_time){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);while(state.exclusive || state.exclusive_waiting_blocked || state.upgrade){
// if(boost::cv_status::timeout shared_cond.wait_until(lk,abs_time))
// {
// if(state.exclusive || state.exclusive_waiting_blocked || state.upgrade)
// {
// return false;
// }
// break;
// }}state.lock_shared();state.upgradetrue;return true;}
#endifbool try_lock_upgrade(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);if(state.exclusive || state.exclusive_waiting_blocked || state.upgrade){return false;}else{state.lock_shared();state.upgradetrue;state.assert_lock_upgraded();return true;}}void unlock_upgrade(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);//state.upgradefalse;state.unlock_upgrade();if(! state.more_shared() ){state.exclusive_waiting_blockedfalse;release_waiters();} else {shared_cond.notify_all();}}// Upgrade - Exclusivevoid unlock_upgrade_and_lock(){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);state.assert_lock_upgraded();state.unlock_shared();
// while (state.more_shared())
// {
// upgrade_cond.wait(lk);
// }state.upgradefalse;state.exclusivetrue;state.assert_locked();}void unlock_and_lock_upgrade(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);state.assert_locked();state.exclusivefalse;state.upgradetrue;state.lock_shared();state.exclusive_waiting_blockedfalse;state.assert_lock_upgraded();release_waiters();}bool try_unlock_upgrade_and_lock(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);state.assert_lock_upgraded();if( !state.exclusive !state.exclusive_waiting_blocked state.upgrade state.shared_count1){state.shared_count0;state.exclusivetrue;state.upgradefalse;state.assert_locked();return true;}return false;}
#ifdef BOOST_THREAD_USES_CHRONOtemplate class Rep, class Periodbooltry_unlock_upgrade_and_lock_for(const boost::chrono::durationRep, Period rel_time){return try_unlock_upgrade_and_lock_until(boost::chrono::steady_clock::now() rel_time);}template class Clock, class Durationbooltry_unlock_upgrade_and_lock_until(const boost::chrono::time_pointClock, Duration abs_time){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endif
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);state.assert_lock_upgraded();if (state.shared_count ! 1){
// for (;;)
// {
// boost::cv_status status shared_cond.wait_until(lk,abs_time);
// if (state.shared_count 1)
// break;
// if(status boost::cv_status::timeout)
// return false;
// }}state.upgradefalse;state.exclusivetrue;state.exclusive_waiting_blockedfalse;state.shared_count0;return true;}
#endif// Shared - Exclusivevoid unlock_and_lock_shared(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);state.assert_locked();state.exclusivefalse;state.lock_shared();state.exclusive_waiting_blockedfalse;release_waiters();}#ifdef BOOST_THREAD_PROVIDES_SHARED_MUTEX_UPWARDS_CONVERSIONSbool try_unlock_shared_and_lock(){boost::unique_lockboost::mutex lk(state_change);state.assert_lock_shared();if( !state.exclusive !state.exclusive_waiting_blocked !state.upgrade state.shared_count1){state.shared_count0;state.exclusivetrue;return true;}return false;}
#ifdef BOOST_THREAD_USES_CHRONOtemplate class Rep, class Periodbooltry_unlock_shared_and_lock_for(const chrono::durationRep, Period rel_time){return try_unlock_shared_and_lock_until(chrono::steady_clock::now() rel_time);}template class Clock, class Durationbooltry_unlock_shared_and_lock_until(const chrono::time_pointClock, Duration abs_time){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endifboost::unique_lockboost::mutex lk(state_change);state.assert_lock_shared();if (state.shared_count ! 1){for (;;){cv_status status shared_cond.wait_until(lk,abs_time);if (state.shared_count 1)break;if(status cv_status::timeout)return false;}}state.upgradefalse;state.exclusivetrue;state.exclusive_waiting_blockedfalse;state.shared_count0;return true;}
#endif
#endif// Shared - Upgradevoid unlock_upgrade_and_lock_shared(){
// boost::unique_lockboost::mutex lk(state_change);boost::unique_lockbip::named_mutexlk(state_change);state.assert_lock_upgraded();state.upgradefalse;state.exclusive_waiting_blockedfalse;release_waiters();}#ifdef BOOST_THREAD_PROVIDES_SHARED_MUTEX_UPWARDS_CONVERSIONSbool try_unlock_shared_and_lock_upgrade(){boost::unique_lockboost::mutex lk(state_change);state.assert_lock_shared();if( !state.exclusive !state.exclusive_waiting_blocked !state.upgrade){state.upgradetrue;return true;}return false;}
#ifdef BOOST_THREAD_USES_CHRONOtemplate class Rep, class Periodbooltry_unlock_shared_and_lock_upgrade_for(const chrono::durationRep, Period rel_time){return try_unlock_shared_and_lock_upgrade_until(chrono::steady_clock::now() rel_time);}template class Clock, class Durationbooltry_unlock_shared_and_lock_upgrade_until(const chrono::time_pointClock, Duration abs_time){
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONSboost::this_thread::disable_interruption do_not_disturb;
#endifboost::unique_lockboost::mutex lk(state_change);state.assert_lock_shared();if( state.exclusive|| state.exclusive_waiting_blocked|| state.upgrade){for (;;){cv_status status exclusive_cond.wait_until(lk,abs_time);if( ! state.exclusive ! state.exclusive_waiting_blocked ! state.upgrade)break;if(status cv_status::timeout)return false;}}state.upgradetrue;return true;}
#endif
#endif};typedef shared_mutex upgrade_mutex;
}#include boost/config/abi_suffix.hpp//#endif测试代码
#include boost/thread/thread.hpp
#include boost/interprocess/sync/scoped_lock.hpp
#include boost/interprocess/sync/named_mutex.hpp
#include boost/ref.hpp#include read_write_mutex.h#include string
#include mutexchy::shared_mutex global_mutex;
int global_num 10;//全局变量写者改变全局变量读者读全局变量
namespace bip boost::interprocess;
//bip::named_mutex global_mutex(bip::open_or_create,mtx);//读线程
void read_thread(std::string name){
// boost::lock_guardbip::named_mutex lock(global_mutex);//读锁定
// bip::named_mutex global_mutex(bip::open_or_create,mtx);
// global_mutex.lock();boost::shared_lockchy::shared_mutex lock{global_mutex};printf(线程%s抢占了资源global_num %d\n,name.c_str(),global_num);boost::this_thread::sleep(boost::posix_time::seconds(1));printf(线程%s释放了资源...\n,name.c_str());
// global_mutex.unlock();
}//写线程
void write_thread(std::string name){
// std::lock_guardbip::named_mutex lock(global_mutex);//写锁定
// bip::named_mutex global_mutex(bip::open_or_create,mtx);
// global_mutex.lock();boost::lock_guardchy::shared_mutex lock{global_mutex};global_num;//写线程改变数据的数值printf(线程%s抢占了资源global_num %d\n,name.c_str(),global_num);boost::this_thread::sleep(boost::posix_time::seconds(1));printf(线程%s释放了资源...\n,name.c_str());
// global_mutex.unlock();
}int main(){std::string read_thread_r1 read_thread_r1;std::string read_thread_r2 read_thread_r2;std::string read_thread_r3 read_thread_r3;std::string read_thread_r4 read_thread_r4;std::string read_thread_r5 read_thread_r5;std::string write_thread_w1 write_thread_w1;std::string write_thread_w2 write_thread_w2;boost::thread_group tg;tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r1)));tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r2)));tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r3)));tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r4)));tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r5)));tg.create_thread(boost::bind(write_thread,boost::ref(write_thread_w1)));tg.create_thread(boost::bind(write_thread,boost::ref(write_thread_w2)));tg.join_all();return 0;
}
