::thread鍙︿竴涓噸瑕佺粍鎴愰儴鍒嗘槸mutex錛屼互鍙?qiáng)宸ヤ綔鍦╩utex涓婄殑boost::mutex::scoped_lock銆乧ondition鍜宐arrier錛岃繖浜涢兘鏄負(fù)瀹炵幇綰跨▼鍚屾鎻愪緵鐨勩?br />
mutex
boost鎻愪緵鐨刴utex鏈?font color="#999900">6縐嶏細(xì)
boost::mutex
boost::try_mutex
boost::timed_mutex
boost::recursive_mutex
boost::recursive_try_mutex
boost::recursive_timed_mutex
涓嬮潰浠呭boost::mutex榪涜鍒嗘瀽銆?br />
mutex綾繪槸涓涓狢riticalSection錛堜復(fù)鐣屽尯錛夊皝瑁呯被錛屽畠鍦ㄦ瀯閫犲嚱鏁頒腑鏂板緩涓涓復(fù)鐣屽尯騫禝nitializeCriticalSection錛岀劧鍚庣敤涓涓垚鍛樺彉閲?font color="#ff6633">
void* m_mutex;
鏉ヤ繚瀛樿涓寸晫鍖虹粨鏋勩?br />
闄?
姝や箣澶栵紝mutex榪樻彁渚涗簡(jiǎn)do_lock銆乨o_unlock絳夋柟娉曪紝榪欎簺鏂規(guī)硶鍒嗗埆璋冪敤EnterCriticalSection銆?
LeaveCriticalSection鏉ヤ慨鏀規(guī)垚鍛樺彉閲弇_mutex錛圕RITICAL_SECTION緇撴瀯鎸囬拡錛夌殑鐘舵侊紝浣嗚繖浜涙柟娉曢兘鏄?font color="#990000">private鐨勶紝浠ラ槻姝㈡垜浠洿鎺ュmutex榪涜閿佹搷浣滐紝鎵鏈夌殑閿佹搷浣滈兘蹇呴』閫氳繃mutex鐨勫弸鍏冪被detail::thread::lock_ops<mutex>鏉ュ畬鎴愶紝姣旇緝鏈夋剰鎬濈殑鏄紝lock_ops鐨勬墍鏈夋柟娉曪細(xì)lock銆乽nlock銆乼rylock絳夐兘鏄?font color="#990000">static鐨勶紝濡俵ock_ops<Mutex>::lock鐨勫疄鐜幫細(xì)
1 template <typename Mutex>
2 class lock_ops : private noncopyable
3 {
4 
5 public:
6 static void lock(Mutex& m)
7 {
8 m.do_lock();
9 }
10 
11 }
boost::thread鐨勮璁¤呬負(fù)浠涔堜細(xì)榪欎箞璁捐鍛紵鎴戞兂澶ф鏄細(xì)
1銆乥oost::thread鐨勮璁¤呬笉甯屾湜琚垜浠洿鎺ユ搷浣渕utex錛屾敼鍙樺叾鐘舵侊紝鎵浠utex鐨勬墍鏈夋柟娉曢兘鏄?font color="#990000">private鐨勶紙闄や簡(jiǎn)鏋勯犲嚱鏁幫紝鏋愭瀯鍑芥暟錛夈?font color="#999900">
2銆佽櫧鐒舵垜浠彲浠ラ氳繃lock_ops鏉ヤ慨鏀筸utex鐨勭姸鎬侊紝濡傦細(xì)
1 #include <boost/thread/thread.hpp>
2 #include <boost/thread/mutex.hpp>
3 #include <boost/thread/detail/lock.hpp>
4
5 int main()
6 {
7 boost::mutex mt;
8 //mt.do_lock(); // Error! Can not access private member!
9
10 boost::detail::thread::lock_ops<boost::mutex>::lock(mt);
11
12 return 0;
13 }
浣嗘槸錛岃繖鏄笉鎺ㄨ崘鐨勶紝鍥犱負(fù)mutex銆乻coped_lock銆乧ondition銆乥arrier鏄竴濂楀畬鏁寸殑綾葷郴錛屽畠浠槸鐩鎬簰鍗忓悓宸ヤ綔鐨勶紝鍍忎笂闈㈣繖涔堟搷浣滄病鏈夊姙娉曚笌鍚庨潰鐨勫嚑涓被鍗忓悓宸ヤ綔銆?br />
scoped_lock
涓婇潰璇磋繃錛屼笉搴旇鐩存帴鐢╨ock_ops鏉ユ搷浣渕utex瀵硅薄錛岄偅涔堬紝搴旇鐢ㄤ粈涔堝憿錛熺瓟妗堝氨鏄痵coped_lock銆備笌瀛樺湪澶氱mutex涓鏍鳳紝瀛樺湪澶氱涓巑utex瀵瑰簲鐨剆coped_lock錛?br />
scoped_lock
scoped_try_lock
scoped_timed_lock
榪欓噷鎴戜滑鍙璁簊coped_lock銆?br />
scoped_lock鏄畾涔夊湪namespace boost::detail::thread涓嬬殑錛屼負(fù)浜?jiǎn)鏂逛究鎴戜滑鋴社敤锛堜篃湄?fù)浜?jiǎn)鏂逛究璁捐鑰咃級(jí)錛宮utex浣跨敤浜?jiǎn)涓嬮潰鐨?font color="#990000">typedef錛?font color="#990000">
typedef detail::thread::scoped_lock<mutex> scoped_lock;
榪欐牱鎴戜滑灝卞彲浠ラ氳繃錛?br />
boost::mutex::scoped_lock
鏉ヤ嬌鐢╯coped_lock綾繪ā鏉夸簡(jiǎn)銆?br />
鐢變簬scoped_lock鐨勪綔鐢ㄤ粎鍦ㄤ簬瀵筸utex鍔犻攣/瑙i攣錛堝嵆浣縨utex EnterCriticalSection/LeaveCriticalSection錛夛紝鍥犳錛屽畠鐨勬帴鍙d篃寰堢畝鍗曪紝闄や簡(jiǎn)鏋勯犲嚱鏁板錛屼粎鏈塴ock/unlock/locked錛堝垽鏂槸鍚﹀凡鍔犻攣錛夛紝鍙?qiáng)绫诲瀷铦{鎹㈡搷浣滅void*錛屼竴鑸垜浠笉闇瑕佹樉寮忚皟鐢ㄨ繖浜涙柟娉曪紝鍥犱負(fù)scoped_lock鐨勬瀯閫犲嚱鏁版槸榪欐牱瀹氫箟鐨勶細(xì)
1 explicit scoped_lock(Mutex& mx, bool initially_locked=true)
2 : m_mutex(mx), m_locked(false)
3 {
4 if (initially_locked) lock();
5 }
娉細(xì)m_mutex鏄竴涓猰utex鐨勫紩鐢ㄣ?br />
鍥犳錛屽綋鎴戜滑涓嶆寚瀹歩nitially_locked鍙傛暟鏋勯犱竴涓猻coped_lock瀵硅薄
鏃訛紝scoped_lock浼?xì)鑷姩瀵规墍緇戝畾鐨刴utex鍔犻攣錛岃屾瀽鏋勫嚱鏁頒細(xì)媯(gè)鏌ユ槸鍚﹀姞閿侊紝鑻ュ凡鍔犻攣錛屽垯瑙i攣錛涘綋鐒?dòng)灱屾湁浜涙儏鍐典笅锛屾垜浠彲鑳戒笉闇瑕佹瀯閫犳椂鑷姩
鍔犻攣錛岃繖鏍峰氨闇瑕佽嚜宸辮皟鐢╨ock鏂規(guī)硶銆傚悗闈㈢殑condition銆乥arrier涔熶細(xì)璋冪敤scoped_lock鐨刲ock銆乽nlock鏂規(guī)硶鏉ュ疄鐜伴儴
鍒嗘柟娉曘?br />
姝e洜涓簊coped_lock鍏鋒湁鍙湪鏋勯犳椂鍔犻攣錛屾瀽鏋勬椂瑙i攣鐨勭壒鎬э紝鎴戜滑緇忓父浼?xì)鋴社敤灞閮ㄥ彉閲忔潵瀹炵幇瀵筸utex鐨勭嫭鍗犺闂?br />
1 #include <boost/thread/thread.hpp>
2 #include <boost/thread/mutex.hpp>
3 #include <iostream>
4
5 boost::mutex io_mutex;
6
7 void count() // worker function
8 {
9 for (int i = 0; i < 10; ++i)
10 {
11 boost::mutex::scoped_lock lock(io_mutex);
12 std::cout << i << std::endl;
13 }
14 }
15
16 int main(int argc, char* argv[])
17 {
18 boost::thread thrd1(&count);
19 boost::thread thrd2(&count);
20 thrd1.join();
21 thrd2.join();
22
23 return 0;
24 }
鍦ㄦ瘡嬈¤緭鍑轟俊鎭椂錛屼負(fù)浜?jiǎn)闃叉鏁翠釜杈撳國(guó)櫩嚱E嬭鍏跺畠綰跨▼鎵撲貢錛岄氳繃瀵筰o_mutex鍔犻攣錛堣繘鍏ヤ復(fù)鐣屽尯錛夛紝浠庤屼繚璇佷簡(jiǎn)杈撳嚭鐨勬紜с?br />
鍦ㄤ嬌鐢?
scoped_lock鏃訛紝鎴戜滑鏈夋椂鍊欓渶瑕佷嬌鐢ㄥ叏灞閿侊紙瀹氫箟涓涓叏灞mutex錛屽綋闇瑕佺嫭鍗犺闂叏灞璧勬簮鏃訛紝浠ヨ鍏ㄥ眬mutex涓哄弬鏁版瀯閫犱竴涓?
scoped_lock瀵硅薄鍗沖彲銆傚叏灞mutex鍙互鏄叏灞鍙橀噺錛屼篃鍙互鏄被鐨勯潤(rùn)鎬佹柟娉曠瓑錛夛紝鏈夋椂鍊欏垯闇瑕佷嬌鐢ㄥ璞¢攣錛堝皢mutex瀹氫箟鎴愮被鐨勬垚鍛樺彉
閲忥級(jí)錛屽簲璇ユ牴鎹渶瑕佽繘琛屽悎鐞嗛夋嫨銆?br />
Java鐨剆ynchronized鍙敤浜庡鏂規(guī)硶鍔犻攣錛屽浠g爜孌靛姞閿侊紝瀵瑰璞″姞閿侊紝瀵圭被鍔犻攣錛堜粛鐒舵槸瀵硅薄綰?
鐨勶級(jí)錛岃繖鍑犵鍔犻攣鏂瑰紡閮藉彲浠ラ氳繃涓婇潰璁茬殑瀵硅薄閿佹潵妯℃嫙錛涚浉鍙嶏紝鍦↗ava涓疄鐜板叏灞閿佸ソ鍍忔湁鐐歸夯鐑?chǔ)锛屽繀椤粸畣璇锋眰灏佽鍒熬c諱腑錛屼互杞崲鎴愪笂闈㈢殑鍥涚
synchronized褰㈠紡涔嬩竴銆?br />
condition
condition鐨勬帴鍙e涓嬶細(xì)
1 class condition : private boost::noncopyable // Exposition only
2 {
3 public:
4 // construct/copy/destruct
5 condition();
6 ~condition();
7
8 // notification
9 void notify_one();
10 void notify_all();
11
12 // waiting
13 template<typename ScopedLock> void wait(ScopedLock&);
14 template<typename ScopedLock, typename Pred> void wait(ScopedLock&, Pred);
15 template<typename ScopedLock>
16 bool timed_wait(ScopedLock&, const boost::xtime&);
17 template<typename ScopedLock, typename Pred>
18 bool timed_wait(ScopedLock&, Pred);
19 };
鍏朵腑wait鐢ㄤ簬絳夊緟鏌愪釜condition鐨勫彂鐢燂紝鑰宼imed_wait鍒欐彁渚涘叿鏈夎秴鏃剁殑wait鍔熻兘錛宯otify_one鐢ㄤ簬鍞ら啋涓涓瓑寰呰condition鍙戠敓鐨勭嚎紼嬶紝notify_all鍒欑敤浜庡敜閱掓墍鏈夌瓑寰呰condition鍙戠敓鐨勭嚎紼嬨?br />
鐢變簬condition鐨勮涔夌浉瀵硅緝涓哄鏉傦紝瀹冪殑瀹炵幇涔熸槸鏁翠釜boost::thread搴撲腑鏈澶嶆潅鐨勶紙瀵筗indows鐗堟湰鑰岃█錛屽鏀寔pthread鐨勭増鏈岃█錛岀敱浜巔thread宸茬粡鎻愪緵浜?jiǎn)pthread_cond_t錛屼嬌寰梒ondition瀹炵幇璧鋒潵涔熷崄鍒嗙畝鍗曪級(jí)錛屼笅闈㈠wait鍜宯otify_one榪涜綆瑕佸垎鏋愩?br />
condition鍐呴儴鍖呭惈浜?jiǎn)涓涓猚ondition_impl瀵硅薄錛岀敱璇ュ璞℃墽琛屾潵澶勭悊瀹為檯鐨剋ait銆乶otify_one...絳夋搷浣溿?br />

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