锘??xml version="1.0" encoding="utf-8" standalone="yes"?> 鍦?涓婁竴綃囨枃绔?/font>緇撴潫鏃訛紝鎴戞弿榪頒簡涓涓瘮杈冪壒孌婄殑闅鵑錛氬鏋滅嚎紼嬫鍦ㄧ瓑寰呮煇涓壒瀹氭潯浠跺彂鐢燂紝瀹冨簲璇ュ浣曞鐞嗚繖縐嶆儏鍐碉紵瀹冨彲浠ラ噸澶嶅浜掓枼瀵硅薄閿佸畾鍜岃В閿侊紝姣忔閮戒細(xì)媯(gè)鏌ュ叡浜暟鎹粨鏋勶紝浠ユ煡鎵炬煇涓箋備絾榪欐槸鍦ㄦ氮璐規(guī)椂闂村拰璧勬簮錛岃屼笖榪欑綣佸繖鏌ヨ鐨勬晥鐜囬潪甯鎬綆銆傝В鍐寵繖涓棶棰樼殑鏈浣蟲柟娉曟槸浣跨敤 pthread_cond_wait() 璋冪敤鏉ョ瓑寰呯壒孌婃潯浠跺彂鐢熴? 浜嗚В pthread_cond_wait() 鐨勪綔鐢ㄩ潪甯擱噸瑕?-- 瀹冩槸 POSIX 綰跨▼淇″彿鍙戦佺郴緇熺殑鏍稿績錛屼篃鏄渶闅句互鐞嗚В鐨勯儴鍒嗐?/p>
棣栧厛錛岃鎴戜滑鑰冭檻浠ヤ笅鎯呭喌錛氱嚎紼嬩負(fù)鏌ョ湅宸查摼鎺ュ垪琛ㄨ岄攣瀹氫簡浜掓枼瀵硅薄錛岀劧鑰岃鍒楄〃鎭板閥鏄┖鐨勩傝繖涓鐗瑰畾綰跨▼浠涔堜篃騫蹭笉浜?-- 鍏惰璁℃剰鍥炬槸浠庡垪琛ㄤ腑闄ゅ幓鑺傜偣錛屼絾鏄幇鍦ㄥ嵈娌℃湁鑺傜偣銆傚洜姝わ紝瀹冨彧鑳斤細(xì) 閿佸畾浜掓枼瀵硅薄鏃訛紝綰跨▼灝嗚皟鐢?pthread_cond_wait(&mycond,&mymutex)銆俻thread_cond_wait() 璋冪敤鐩稿綋澶嶆潅錛屽洜姝ゆ垜浠瘡嬈″彧鎵ц瀹冪殑涓涓搷浣溿?/p>
pthread_cond_wait() 鎵鍋氱殑絎竴浠朵簨灝辨槸鍚屾椂瀵逛簰鏂ュ璞¤В閿侊紙浜庢槸鍏跺畠綰跨▼鍙互淇敼宸查摼鎺ュ垪琛級(jí)錛屽茍絳夊緟鏉′歡 mycond 鍙戠敓錛堣繖鏍峰綋 pthread_cond_wait() 鎺ユ敹鍒板彟涓涓嚎紼嬬殑“淇″彿”鏃訛紝瀹冨皢鑻忛啋錛夈傜幇鍦ㄤ簰鏂ュ璞″凡琚В閿侊紝鍏跺畠綰跨▼鍙互璁塊棶鍜屼慨鏀瑰凡閾炬帴鍒楄〃錛屽彲鑳借繕浼?xì)娣诲姞椤广?/p>
姝ゆ椂錛宲thread_cond_wait() 璋冪敤榪樻湭榪斿洖銆傚浜掓枼瀵硅薄瑙i攣浼?xì)绔嬪崨_彂鐢燂紝浣嗙瓑寰呮潯浠?mycond 閫氬父鏄竴涓樆濉炴搷浣滐紝榪欐剰鍛崇潃綰跨▼灝嗙潯鐪狅紝鍦ㄥ畠鑻忛啋涔嬪墠涓嶄細(xì)娑堣?CPU 鍛ㄦ湡銆傝繖姝f槸鎴戜滑鏈熷緟鍙戠敓鐨勬儏鍐點(diǎn)傜嚎紼嬪皢涓鐩寸潯鐪狅紝鐩村埌鐗瑰畾鏉′歡鍙戠敓錛屽湪榪欐湡闂翠笉浼?xì)鍙戠敓鋼Q浣曟氮璐?CPU 鏃墮棿鐨勭箒蹇欐煡璇€備粠綰跨▼鐨勮搴︽潵鐪嬶紝瀹冨彧鏄湪絳夊緟 pthread_cond_wait() 璋冪敤榪斿洖銆?/p>
鐜板湪緇х畫璇存槑錛屽亣璁懼彟涓涓嚎紼嬶紙縐頒綔“2 鍙風(fēng)嚎紼?#8221;錛夐攣瀹氫簡 mymutex 騫跺宸查摼鎺ュ垪琛ㄦ坊鍔犱簡涓欏廣傚湪瀵逛簰鏂ュ璞¤В閿佷箣鍚庯紝2 鍙風(fēng)嚎紼嬩細(xì)绔嬪嵆璋冪敤鍑芥暟 pthread_cond_broadcast(&mycond)銆傛鎿嶄綔涔嬪悗錛? 鍙風(fēng)嚎紼嬪皢浣挎墍鏈夌瓑寰?mycond 鏉′歡鍙橀噺鐨勭嚎紼嬬珛鍗寵嫃閱掋傝繖鎰忓懗鐫絎竴涓嚎紼嬶紙浠嶅浜?pthread_cond_wait() 璋冪敤涓級(jí)鐜板湪灝嗚嫃閱掋?/p>
鐜板湪錛岀湅涓涓嬬涓涓嚎紼嬪彂鐢熶簡浠涔堛傛?zhèn)ㄥ彲鑳戒細(xì)璁や负鍦?2 鍙風(fēng)嚎紼嬭皟鐢?pthread_cond_broadcast(&mymutex) 涔嬪悗錛? 鍙風(fēng)嚎紼嬬殑 pthread_cond_wait() 浼?xì)绔嬪崒櫩斿洖銆備笉鏄偅鏍鳳紒瀹為檯涓婏紝pthread_cond_wait() 灝嗘墽琛屾渶鍚庝竴涓搷浣滐細(xì)閲嶆柊閿佸畾 mymutex銆備竴鏃?pthread_cond_wait() 閿佸畾浜嗕簰鏂ュ璞★紝閭d箞瀹冨皢榪斿洖騫跺厑璁?1 鍙風(fēng)嚎紼嬬戶緇墽琛屻傞偅鏃訛紝瀹冨彲浠ラ┈涓婃鏌ュ垪琛紝鏌ョ湅瀹冩墍鎰熷叴瓚g殑鏇存敼銆?/p>
閭d釜榪囩▼闈炲父澶嶆潅錛屽洜姝よ鎴戜滑鍏堟潵鍥為【涓涓嬨傜涓涓嚎紼嬮鍏堣皟鐢細(xì) 鐒跺悗錛屽畠媯(gè)鏌ヤ簡鍒楄〃銆傛病鏈夋壘鍒版劅鍏磋叮鐨勪笢瑗匡紝浜庢槸瀹冭皟鐢細(xì) 鐒跺悗錛宲thread_cond_wait() 璋冪敤鍦ㄨ繑鍥炲墠鎵ц璁稿鎿嶄綔錛?/p>
瀹冨 mymutex 瑙i攣錛岀劧鍚庤繘鍏ョ潯鐪犵姸鎬侊紝絳夊緟 mycond 浠ユ帴鏀?POSIX 綰跨▼“淇″彿”銆備竴鏃︽帴鏀跺埌“淇″彿”錛堝姞寮曞彿鏄洜涓烘垜浠茍涓嶆槸鍦ㄨ璁轟紶緇熺殑 UNIX 淇″彿錛岃屾槸鏉ヨ嚜 pthread_cond_signal() 鎴?pthread_cond_broadcast() 璋冪敤鐨勪俊鍙鳳級(jí)錛屽畠?yōu)兗?xì)鑻忛啋銆備絾 pthread_cond_wait() 娌℃湁绔嬪嵆榪斿洖 -- 瀹冭繕瑕佸仛涓浠朵簨錛氶噸鏂伴攣瀹?mutex錛?/p>
pthread_cond_wait() 鐭ラ亾鎴戜滑鍦ㄦ煡鎵?mymutex “鑳屽悗”鐨勫彉鍖栵紝鍥犳瀹冪戶緇搷浣滐紝涓烘垜浠攣瀹氫簰鏂ュ璞★紝鐒跺悗鎵嶈繑鍥炪?/p>
pthread_cond_wait() 灝忔祴楠?/span> 鐜板湪宸插洖欏句簡 pthread_cond_wait() 璋冪敤錛屾?zhèn)ㄥ簲璇ヤ簡瑙d簡瀹冪殑宸ヤ綔鏂瑰紡銆傚簲璇ヨ兘澶熷彊榪?pthread_cond_wait() 渚濇鎵ц鐨勬墍鏈夋搷浣溿傚皾璇曚竴涓嬨傚鏋滅悊瑙d簡 pthread_cond_wait()錛屽叾浣欓儴鍒嗗氨鐩稿綋瀹規(guī)槗錛屽洜姝よ閲嶆柊闃呰浠ヤ笂閮ㄥ垎錛岀洿鍒拌浣忎負(fù)姝€傚ソ錛岃瀹屼箣鍚庯紝鑳藉惁鍛婅瘔鎴戝湪璋冪敤 pthread_cond_wait() 涔?鍓?/em>錛屼簰鏂ュ璞″繀欏誨浜庝粈涔堢姸鎬侊紵pthread_cond_wait() 璋冪敤榪斿洖涔嬪悗錛屼簰鏂ュ璞″浜庝粈涔堢姸鎬侊紵榪欎袱涓棶棰樼殑絳旀閮芥槸“閿佸畾”銆傛棦鐒跺凡緇忓畬鍏ㄧ悊瑙d簡 pthread_cond_wait() 璋冪敤錛岀幇鍦ㄦ潵緇х畫鐮旂┒鏇寸畝鍗曠殑涓滆タ -- 鍒濆鍖栧拰鐪熸鐨勫彂閫佷俊鍙峰拰騫挎挱榪涚▼銆傚埌閭f椂錛屾垜浠皢浼?xì)瀵瑰寘鍚簡澶毦U跨▼宸ヤ綔闃熷垪鐨?C 浠g爜浜嗗鎸囨帉銆? 鏉′歡鍙橀噺鏄竴涓渶瑕佸垵濮嬪寲鐨勭湡瀹炴暟鎹粨鏋勩備互涓嬪氨鍒濆鍖栫殑鏂規(guī)硶銆傞鍏堬紝瀹氫箟鎴栧垎閰嶄竴涓潯浠跺彉閲忥紝濡備笅鎵紺猴細(xì) 鐒跺悗錛岃皟鐢ㄤ互涓嬪嚱鏁拌繘琛屽垵濮嬪寲錛?/p>
鐬э紝鍒濆鍖栧畬鎴愪簡錛佸湪閲婃斁鎴栧簾寮冩潯浠跺彉閲忎箣鍓嶏紝闇瑕佹瘉鍧忓畠錛屽涓嬫墍紺猴細(xì) 寰堢畝鍗曞惂銆傛帴鐫璁ㄨ pthread_cond_wait() 璋冪敤銆?/p>
涓鏃﹀垵濮嬪寲浜嗕簰鏂ュ璞″拰鏉′歡鍙橀噺錛屽氨鍙互絳夊緟鏌愪釜鏉′歡錛屽涓嬫墍紺猴細(xì) 璇鋒敞鎰忥紝浠g爜鍦ㄩ昏緫涓婂簲璇ュ寘鍚?mycond 鍜?mymutex銆備竴涓壒瀹氭潯浠跺彧鑳芥湁涓涓簰鏂ュ璞★紝鑰屼笖鏉′歡鍙橀噺搴旇琛ㄧず浜掓枼鏁版嵁“鍐呴儴”鐨勪竴縐嶇壒孌婄殑鏉′歡鏇存敼銆備竴涓簰鏂ュ璞″彲浠ョ敤璁稿鏉′歡鍙橀噺錛堜緥濡傦紝cond_empty銆乧ond_full銆乧ond_cleanup錛夛紝浣嗘瘡涓潯浠跺彉閲忓彧鑳芥湁涓涓簰鏂ュ璞°?/p>
瀵逛簬鍙戦佷俊鍙峰拰騫挎挱錛岄渶瑕佹敞鎰忎竴鐐廣傚鏋滅嚎紼嬫洿鏀規(guī)煇浜涘叡浜暟鎹紝鑰屼笖瀹冩兂瑕佸敜閱掓墍鏈夋鍦ㄧ瓑寰呯殑綰跨▼錛屽垯搴斾嬌鐢?pthread_cond_broadcast 璋冪敤錛屽涓嬫墍紺猴細(xì) 鍦ㄦ煇浜涙儏鍐典笅錛屾椿鍔ㄧ嚎紼嬪彧闇瑕佸敜閱掔涓涓鍦ㄧ潯鐪犵殑綰跨▼銆傚亣璁炬?zhèn)ㄥ彧瀵归槦鍒楁氛d姞浜嗕竴涓伐浣滀綔涓氥傞偅涔堝彧闇瑕佸敜閱掍竴涓伐浣滅▼搴忕嚎紼嬶紙鍐嶅敜閱掑叾瀹冪嚎紼嬫槸涓嶇ぜ璨岀殑錛侊級(jí)錛?/p>
姝ゅ嚱鏁板彧鍞ら啋涓涓嚎紼嬨傚鏋?POSIX 綰跨▼鏍囧噯鍏佽鎸囧畾涓涓暣鏁幫紝鍙互璁╂?zhèn)ㄥ敜閱掍竴瀹氭暟閲忕殑姝e湪鐫$湢鐨勭嚎紼嬶紝閭e氨鏇村畬緹庝簡銆備絾鏄緢鍙儨錛屾垜娌℃湁琚個(gè)璇峰弬鍔犱細(xì)璁?/p>
鎴戝皢婕旂ず濡備綍鍒涘緩澶氱嚎紼嬪伐浣滅粍銆傚湪榪欎釜鏂規(guī)涓紝鎴戜滑鍒涘緩浜嗚澶氬伐浣滅▼搴忕嚎紼嬨傛瘡涓嚎紼嬮兘浼?xì)妫鏌?wq錛?#8220;宸ヤ綔闃熷垪”錛夛紝鏌ョ湅鏄惁鏈夐渶瑕佸畬鎴愮殑宸ヤ綔銆傚鏋滄湁闇瑕佸畬鎴愮殑宸ヤ綔錛岄偅涔堢嚎紼嬪皢浠庨槦鍒椾腑闄ゅ幓涓涓妭鐐癸紝鎵ц榪欎簺鐗瑰畾宸ヤ綔錛岀劧鍚庣瓑寰呮柊鐨勫伐浣滃埌杈俱?/p>
涓庢鍚屾椂錛屼富綰跨▼璐熻矗鍒涘緩榪欎簺宸ヤ綔紼嬪簭綰跨▼銆佸皢宸ヤ綔娣誨姞鍒伴槦鍒楋紝鐒跺悗鍦ㄥ畠閫鍑烘椂鏀墮泦鎵鏈夊伐浣滅▼搴忕嚎紼嬨傛?zhèn)畣浼?xì)閬囧埌璁稿 C 浠g爜錛屽ソ濂藉噯澶囧惂錛?/p>
闇瑕侀槦鍒楁槸鍑轟簬涓や釜鍘熷洜銆傞鍏堬紝闇瑕侀槦鍒楁潵淇濆瓨宸ヤ綔浣滀笟銆傝繕闇瑕佸彲鐢ㄤ簬璺熻釜宸茬粓姝㈢嚎紼嬬殑鏁版嵁緇撴瀯銆傝繕璁板緱鍓嶅嚑綃囨枃绔狅紙璇峰弬闃呮湰鏂囩粨灝懼鐨?鍙傝冭祫鏂?/font>錛変腑錛屾垜鏇炬彁鍒拌繃闇瑕佷嬌鐢ㄥ甫鏈夌壒瀹氳繘紼嬫爣璇嗙殑 pthread_join 鍚楋紵浣跨敤“娓呴櫎闃熷垪”錛堢О浣?"cq"錛夊彲浠ヨВ鍐蟲棤娉曠瓑寰?浠諱綍宸茬粓姝㈢嚎紼嬬殑闂錛堢◢鍚庡皢璇︾粏璁ㄨ榪欎釜闂錛夈備互涓嬫槸鏍囧噯闃熷垪浠g爜銆傚皢姝や唬鐮佷繚瀛樺埌鏂囦歡 queue.h 鍜?queue.c錛? 鎴戠紪鍐欑殑騫朵笉鏄嚎紼嬪畨鍏ㄧ殑闃熷垪渚嬬▼錛屼簨瀹炰笂鎴戝垱寤轟簡涓涓?#8220;鏁版嵁鍖呰”鎴?#8220;鎺у埗”緇撴瀯錛屽畠鍙互鏄換浣曠嚎紼嬫敮鎸佺殑鏁版嵁緇撴瀯銆傜湅涓涓?control.h錛?/p>
鐜板湪鎮(zhèn)ㄧ湅鍒頒簡 data_control 緇撴瀯瀹氫箟錛屼互涓嬫槸瀹冪殑瑙嗚琛ㄧず錛?/p>
鍥懼儚涓殑閿佷唬琛ㄤ簰鏂ュ璞★紝瀹冨厑璁稿鏁版嵁緇撴瀯榪涜浜掓枼璁塊棶銆傞粍鑹茬殑鏄熶唬琛ㄦ潯浠跺彉閲忥紝瀹冨彲浠ョ潯鐪狅紝鐩村埌鎵璁ㄨ鐨勬暟鎹粨鏋勬敼鍙樹負(fù)姝€俹n/off 寮鍏寵〃紺烘暣鏁?"active"錛屽畠鍛婅瘔綰跨▼姝ゆ暟鎹槸鍚︽槸媧誨姩鐨勩傚湪浠g爜涓紝鎴戜嬌鐢ㄦ暣鏁?active 浣滀負(fù)鏍囧織錛屽憡璇夊伐浣滈槦鍒椾綍鏃跺簲璇ュ叧闂備互涓嬫槸 control.c錛?/p>
鍦ㄥ紑濮嬭皟璇曚箣鍓嶏紝榪橀渶瑕佷竴涓枃浠躲備互涓嬫槸 dbug.h錛?/p>
姝や唬鐮佺敤浜庡鐞嗗伐浣滅粍浠g爜涓殑涓嶅彲綰犳閿欒銆?/p>
璇村埌宸ヤ綔緇勪唬鐮侊紝浠ヤ笅灝辨槸錛?/p>
鐜板湪鏉ュ揩閫熷垵鎺掍唬鐮併傚畾涔夌殑絎竴涓粨鏋勭О浣?"wq"錛屽畠鍖呭惈浜?data_control 鍜岄槦鍒楀ご銆俤ata_control 緇撴瀯鐢ㄤ簬浠茶瀵規(guī)暣涓槦鍒楃殑璁塊棶錛屽寘鎷槦鍒椾腑鐨勮妭鐐廣備笅涓姝ュ伐浣滄槸瀹氫箟瀹為檯鐨勫伐浣滆妭鐐廣傝浣夸唬鐮佺鍚堟湰鏂囦腑鐨勭ず渚嬶紝姝ゅ鎵鍖呭惈鐨勯兘鏄綔涓氬彿銆?/p>
鎺ョ潃錛屽垱寤烘竻闄ら槦鍒椼傛敞閲婅鏄庝簡瀹冪殑宸ヤ綔鏂瑰紡銆傚ソ錛岀幇鍦ㄨ鎴戜滑璺寵繃 threadfunc()銆乯oin_threads()銆乧reate_threads() 鍜?initialize_structs() 璋冪敤錛岀洿鎺ヨ煩鍒?main()銆傛墍鍋氱殑絎竴浠朵簨灝辨槸鍒濆鍖栫粨鏋?-- 榪欏寘鎷垵濮嬪寲 data_controls 鍜岄槦鍒楋紝浠ュ強(qiáng)嬋媧誨伐浣滈槦鍒椼?/p>
鐜板湪鍒濆鍖栫嚎紼嬨傚鏋滅湅涓涓?create_threads() 璋冪敤錛屼技涔庝竴鍒囨甯?-- 闄や簡涓浠朵簨銆傝娉ㄦ剰錛屾垜浠鍦ㄥ垎閰嶆竻闄よ妭鐐癸紝浠ュ強(qiáng)鍒濆鍖栧畠鐨勭嚎紼嬪彿鍜?TID 緇勪歡銆傛垜浠繕灝嗘竻闄よ妭鐐逛綔涓哄垵濮嬭嚜鍙橀噺浼犻掔粰姣忎竴涓柊鐨勫伐浣滅▼搴忕嚎紼嬨備負(fù)浠涔堣繖鏍峰仛錛?/p>
鍥犱負(fù)褰撴煇涓伐浣滅▼搴忕嚎紼嬮鍑烘椂錛屽畠浼?xì)灏嗗叾娓呴櫎鑺傜偣杩炴帴鍒版竻闄ら槦鍒楀Q岀劧鍚庣粓姝€傞偅鏃訛紝涓葷嚎紼嬩細(xì)鍦ㄦ竻闄ら槦鍒椾腑媯(gè)嫻嬪埌榪欎釜鑺傜偣錛堝埄鐢ㄦ潯浠跺彉閲忥級(jí)錛屽茍灝嗚繖涓妭鐐圭Щ鍑洪槦鍒椼傚洜涓?TID錛堢嚎紼嬫爣璇嗭級(jí)瀛樺偍鍦ㄦ竻闄よ妭鐐逛腑錛屾墍浠ヤ富綰跨▼鍙互紜垏鐭ラ亾鍝釜綰跨▼宸茬粓姝簡銆傜劧鍚庯紝涓葷嚎紼嬪皢璋冪敤 pthread_join(tid)錛屽茍鑱旀帴閫傚綋鐨勫伐浣滅▼搴忕嚎紼嬨傚鏋滄病鏈夊仛璁板綍錛岄偅涔堜富綰跨▼灝遍渶瑕佹寜浠繪剰欏哄簭鑱旀帴宸ヤ綔紼嬪簭綰跨▼錛屽彲鑳芥槸鎸夊畠浠殑鍒涘緩欏哄簭銆傜敱浜庣嚎紼嬩笉涓瀹氭寜姝ら『搴忕粓姝紝閭d箞涓葷嚎紼嬪彲鑳戒細(xì)鍦ㄥ凡緇忚仈鎺ヤ簡鍗佷釜綰跨▼鏃訛紝絳夊緟鑱旀帴鍙︿竴涓嚎紼嬨傛?zhèn)ㄨ兘鐞嗚В杩櫩U嶈璁″喅絳栨槸濡備綍浣垮叧闂唬鐮佸姞閫熺殑鍚楋紙灝ゅ叾鍦ㄤ嬌鐢ㄥ嚑鐧句釜宸ヤ綔紼嬪簭綰跨▼鐨勬儏鍐典笅錛夛紵 鎴戜滑宸插惎鍔ㄤ簡宸ヤ綔紼嬪簭綰跨▼錛堝畠浠凡緇忓畬鎴愪簡鎵ц threadfunc()錛岀◢鍚庡皢璁ㄨ姝ゅ嚱鏁幫級(jí)錛岀幇鍦ㄤ富綰跨▼寮濮嬪皢宸ヤ綔鑺傜偣鎻掑叆宸ヤ綔闃熷垪銆傞鍏堬紝瀹冮攣瀹?wq 鐨勬帶鍒朵簰鏂ュ璞★紝鐒跺悗鍒嗛厤 16000 涓伐浣滃寘錛屽皢瀹冧滑閫愪釜鎻掑叆闃熷垪銆傚畬鎴愪箣鍚庯紝灝嗚皟鐢?pthread_cond_broadcast()錛屼簬鏄墍鏈夋鍦ㄧ潯鐪犵殑綰跨▼浼?xì)琚敜閱掑Q屽茍寮濮嬫墽琛屽伐浣溿傛鏃訛紝涓葷嚎紼嬪皢鐫$湢涓ょ閽燂紝鐒跺悗閲婃斁宸ヤ綔闃熷垪錛屽茍閫氱煡宸ヤ綔紼嬪簭綰跨▼緇堟媧誨姩銆傛帴鐫錛屼富綰跨▼浼?xì)璋冪?join_threads() 鍑芥暟鏉ユ竻闄ゆ墍鏈夊伐浣滅▼搴忕嚎紼嬨?/p>
鐜板湪鏉ヨ璁?threadfunc()錛岃繖鏄墍鏈夊伐浣滅▼搴忕嚎紼嬮兘瑕佹墽琛岀殑浠g爜銆傚綋宸ヤ綔紼嬪簭綰跨▼鍚姩鏃訛紝瀹冧細(xì)绔嬪嵆閿佸畾宸ヤ綔闃熷垪浜掓枼瀵硅薄錛岃幏鍙栦竴涓伐浣滆妭鐐癸紙濡傛灉鏈夌殑璇濓級(jí)錛岀劧鍚庡瀹冭繘琛屽鐞嗐傚鏋滄病鏈夊伐浣滐紝鍒欒皟鐢?pthread_cond_wait()銆傛?zhèn)ㄤ細(xì)娉ㄦ剰鍒皹q欎釜璋冪敤鍦ㄤ竴涓潪甯哥揣鍑戠殑 while() 寰幆涓紝榪欐槸闈炲父閲嶈鐨勩傚綋浠?pthread_cond_wait() 璋冪敤涓嫃閱掓椂錛屽喅涓嶈兘璁や負(fù)鏉′歡鑲畾鍙戠敓浜?-- 瀹?鍙兘鍙戠敓浜嗭紝涔熷彲鑳芥病鏈夊彂鐢熴傚鏋滃彂鐢熶簡榪欑鎯呭喌錛屽嵆閿欒鍦板敜閱掍簡綰跨▼錛岃屽垪琛ㄦ槸絀虹殑錛岄偅涔?while 寰幆灝嗗啀嬈¤皟鐢?pthread_cond_wait()銆? 濡傛灉鏈変竴涓伐浣滆妭鐐癸紝閭d箞鎴戜滑鍙墦鍗板畠鐨勪綔涓氬彿錛岄噴鏀懼畠騫墮鍑恒傜劧鑰岋紝瀹為檯浠g爜浼?xì)鎵ц涓浜涙洿瀹炶川鎬х殑鎿嶄綔銆傚湪 while() 寰幆緇撳熬錛屾垜浠攣瀹氫簡浜掓枼瀵硅薄錛屼互渚挎鏌?active 鍙橀噺錛屼互鍙?qiáng)鍦ㄥ惊鐜瘷鍓檭▼個(gè)鏌ユ柊鐨勫伐浣滆妭鐐廣傚鏋滄墽琛屽畬姝や唬鐮侊紝灝變細(xì)鍙戠幇濡傛灉 wq.control.active 鏄?0錛寃hile 寰幆灝變細(xì)緇堟錛屽茍浼?xì)鎵ц?threadfunc() 緇撳熬澶勭殑娓呴櫎浠g爜銆?/p>
宸ヤ綔紼嬪簭綰跨▼鐨勬竻闄や唬鐮侀儴浠墮潪甯告湁瓚c傞鍏堬紝鐢變簬 pthread_cond_wait() 榪斿洖浜嗛攣瀹氱殑浜掓枼瀵硅薄錛屽畠浼?xì)瀵?work_queue 瑙i攣銆傜劧鍚庯紝瀹冮攣瀹氭竻闄ら槦鍒楋紝娣誨姞娓呴櫎浠g爜錛堝寘鍚簡 TID錛屼富綰跨▼灝嗕嬌鐢ㄦ TID 鏉ヨ皟鐢?pthread_join()錛夛紝鐒跺悗鍐嶅娓呴櫎闃熷垪瑙i攣銆傛鍚庯紝瀹冨彂淇″彿緇欐墍鏈?cq 絳夊緟鑰?(pthread_cond_signal(&cq.control.cond))錛屼簬鏄富綰跨▼灝辯煡閬撴湁涓涓緟澶勭悊鐨勬柊鑺傜偣銆傛垜浠笉浣跨敤 pthread_cond_broadcast()錛屽洜涓烘病鏈夎繖涓繀瑕?-- 鍙湁涓涓嚎紼嬶紙涓葷嚎紼嬶級(jí)鍦ㄧ瓑寰呮竻闄ら槦鍒椾腑鐨勬柊鑺傜偣銆傚綋瀹冭皟鐢?join_threads() 鏃訛紝宸ヤ綔紼嬪簭綰跨▼灝嗘墦鍗板叧闂秷鎭紝鐒跺悗緇堟錛岀瓑寰呬富綰跨▼鍙戝嚭鐨?pthread_join() 璋冪敤銆?/p>
濡傛灉瑕佹煡鐪嬪叧浜庡浣曚嬌鐢ㄦ潯浠跺彉閲忕殑綆鍗曠ず渚嬶紝璇峰弬鑰?join_threads() 鍑芥暟銆傚鏋滆繕鏈夊伐浣滅▼搴忕嚎紼嬶紝join_threads() 浼?xì)涓鐩存墽琛岋紝絳夊緟娓呴櫎闃熷垪涓柊鐨勬竻闄よ妭鐐廣傚鏋滄湁鏂拌妭鐐癸紝鎴戜滑浼?xì)灏嗘鑺傜偣绉诲嚭闃熷垪銆佸娓呴櫎闃熷垪瑙i攣錛堜粠鑰屼嬌宸ヤ綔紼嬪簭鍙互娣誨姞娓呴櫎鑺傜偣錛夈佽仈鎺ユ柊鐨勫伐浣滅▼搴忕嚎紼嬶紙浣跨敤瀛樺偍鍦ㄦ竻闄よ妭鐐逛腑鐨?TID錛夈侀噴鏀炬竻闄よ妭鐐廣佸噺灝?#8220;鐜版湁”綰跨▼鐨勬暟閲忥紝鐒跺悗緇х畫銆?/p>
鐜板湪宸茬粡鍒頒簡“POSIX 綰跨▼璇﹁В”緋誨垪鐨勫熬澹幫紝甯屾湜鎮(zhèn)ㄥ凡緇忓噯澶囧ソ寮濮嬪皢澶氱嚎紼嬩唬鐮佹坊鍔犲埌鎮(zhèn)ㄨ嚜宸辯殑搴旂敤紼嬪簭涓傛湁鍏寵緇嗕俊鎭紝璇峰弬闃?鍙傝冭祫鏂?/font>閮ㄥ垎錛岃繖閮ㄥ垎鍐呭榪樺寘鍚簡鏈枃涓嬌鐢ㄧ殑鎵鏈夋簮鐮佺殑 tar 鏂囦歡銆備笅涓涓郴鍒椾腑鍐嶈錛? Daniel Robbins 灞呬綇鍦ㄦ柊澧ㄨタ鍝ュ窞鐨?Albuquerque銆備粬鏄?Gentoo Technologies, Inc. 鐨勬昏鍏?CEO錛孏entoo 欏圭洰鐨勬昏璁″笀錛孧acMillan 鍑虹増涔︾睄鐨勬挵紼夸綔鑰咃紝浠栫殑钁椾綔鏈夛細(xì) Caldera OpenLinux Unleashed, SuSE Linux Unleashed, 鍜?Samba Unleashed銆侱aniel 鑷簩騫寸駭璧峰氨涓庤綆楁満鏌愪簺棰嗗煙緇撲笅涓嶈В涔嬬紭錛岄偅鏃朵粬棣栧厛鎺ヨЕ鐨勬槸 Logo 紼嬪簭璇█錛屽茍娌夋漢浜?Pac-Man 娓告垙涓傝繖涔熻灝辨槸浠栬嚦浠婁粛鎷呬換 SONY Electronic Publishing/Psygnosis 鐨勯甯浘褰㈣璁″笀鐨勫師鍥犳墍鍦ㄣ侱aniel 鍠滄涓庡瀛?Mary 鍜屾柊鍑虹敓鐨勫コ鍎?Hadassah 涓璧峰叡搴︽椂鍏夈傚彲閫氳繃 drobbins@gentoo.org涓?Daniel 鑱旂郴銆? Daniel Robbins 灞呬綇鍦ㄦ柊澧ㄨタ鍝ュ窞鐨?Albuquerque銆備粬鏄?Gentoo Technologies, Inc. 鐨勬昏鍏?CEO錛孏entoo 欏圭洰鐨勬昏璁″笀錛孧acMillan 鍑虹増涔︾睄鐨勬挵紼夸綔鑰咃紝浠栫殑钁椾綔鏈夛細(xì) Caldera OpenLinux Unleashed, SuSE Linux Unleashed, 鍜?Samba Unleashed銆侱aniel 鑷簩騫寸駭璧峰氨涓庤綆楁満鏌愪簺棰嗗煙緇撲笅涓嶈В涔嬬紭錛岄偅鏃朵粬棣栧厛鎺ヨЕ鐨勬槸 Logo 紼嬪簭璇█錛屽茍娌夋漢浜?Pac-Man 娓告垙涓傝繖涔熻灝辨槸浠栬嚦浠婁粛鎷呬換 SONY Electronic Publishing/Psygnosis 鐨勯甯浘褰㈣璁″笀鐨勫師鍥犳墍鍦ㄣ侱aniel 鍠滄涓庡瀛?Mary 鍜屾柊鍑虹敓鐨勫コ鍎?Hadassah 涓璧峰叡搴︽椂鍏夈傚彲閫氳繃 drobbins@gentoo.org涓?Daniel 鑱旂郴銆? Daniel Robbins 灞呬綇鍦ㄦ柊澧ㄨタ鍝ュ窞鐨?Albuquerque銆備粬鏄?Gentoo Technologies, Inc. 鐨勬昏鍏?CEO錛孏entoo 欏圭洰鐨勬昏璁″笀錛孧acMillan 鍑虹増涔︾睄鐨勬挵紼夸綔鑰咃紝浠栫殑钁椾綔鏈夛細(xì) Caldera OpenLinux Unleashed, SuSE Linux Unleashed, 鍜?Samba Unleashed銆侱aniel 鑷簩騫寸駭璧峰氨涓庤綆楁満鏌愪簺棰嗗煙緇撲笅涓嶈В涔嬬紭錛岄偅鏃朵粬棣栧厛鎺ヨЕ鐨勬槸 Logo 紼嬪簭璇█錛屽茍娌夋漢浜?Pac-Man 娓告垙涓傝繖涔熻灝辨槸浠栬嚦浠婁粛鎷呬換 SONY Electronic Publishing/Psygnosis 鐨勯甯浘褰㈣璁″笀鐨勫師鍥犳墍鍦ㄣ侱aniel 鍠滄涓庡瀛?Mary 鍜屾柊鍑虹敓鐨勫コ鍎?Hadassah 涓璧峰叡搴︽椂鍏夈傚彲閫氳繃 drobbins@gentoo.org涓?Daniel 鑱旂郴銆? Daniel Robbins 灞呬綇鍦ㄦ柊澧ㄨタ鍝ュ窞鐨?Albuquerque銆備粬鏄?Gentoo Technologies, Inc. 鐨勬昏鍏?CEO錛孏entoo 欏圭洰鐨勬昏璁″笀錛孧acMillan 鍑虹増涔︾睄鐨勬挵紼夸綔鑰咃紝浠栫殑钁椾綔鏈夛細(xì) Caldera OpenLinux Unleashed, SuSE Linux Unleashed, 鍜?Samba Unleashed銆侱aniel 鑷簩騫寸駭璧峰氨涓庤綆楁満鏌愪簺棰嗗煙緇撲笅涓嶈В涔嬬紭錛岄偅鏃朵粬棣栧厛鎺ヨЕ鐨勬槸 Logo 紼嬪簭璇█錛屽茍娌夋漢浜?Pac-Man 娓告垙涓傝繖涔熻灝辨槸浠栬嚦浠婁粛鎷呬換 SONY Electronic Publishing/Psygnosis 鐨勯甯浘褰㈣璁″笀鐨勫師鍥犳墍鍦ㄣ侱aniel 鍠滄涓庡瀛?Mary 鍜屾柊鍑虹敓鐨勫コ鍎?Hadassah 涓璧峰叡搴︽椂鍏夈傚彲閫氳繃 drobbins@gentoo.org涓?Daniel 鑱旂郴銆? 鍦?鍓嶄竴綃囨枃绔犱腑 錛岃皥鍒頒簡浼?xì)瀵艰嚧寮傚父缁撴灉鐨劸U跨▼浠g爜銆備袱涓嚎紼嬪垎鍒鍚屼竴涓叏灞鍙橀噺榪涜浜嗕簩鍗佹鍔犱竴銆傚彉閲忕殑鍊兼渶鍚庡簲璇ユ槸 40錛屼絾鏈緇堝煎嵈鏄?21銆傝繖鏄庝箞鍥炰簨鍛紵鍥犱負(fù)涓涓嚎紼嬩笉鍋滃湴“鍙栨秷”浜嗗彟涓涓嚎紼嬫墽琛岀殑鍔犱竴鎿嶄綔錛屾墍浠ヤ駭鐢熻繖涓棶棰樸傜幇鍦ㄨ鎴戜滑鏉ユ煡鐪嬫敼姝e悗鐨勪唬鐮侊紝瀹冧嬌鐢?浜掓枼瀵硅薄(mutex)鏉ヨВ鍐寵闂錛? 濡傛灉灝嗚繖孌典唬鐮佷笌 鍓嶄竴綃囨枃绔?/font> 涓粰鍑虹殑鐗堟湰浣滀竴涓瘮杈冿紝灝變細(xì)娉ㄦ剰鍒板鍔犱簡 pthread_mutex_lock() 鍜?pthread_mutex_unlock() 鍑芥暟璋冪敤銆傚湪綰跨▼紼嬪簭涓繖浜涜皟鐢ㄦ墽琛屼簡涓嶅彲鎴栫己鐨勫姛鑳姐備粬浠彁渚涗簡涓縐?鐩鎬簰鎺掓枼鐨勬柟娉曪紙浜掓枼瀵硅薄鍗崇敱姝ゅ緱鍚嶏級(jí)銆備袱涓嚎紼嬩笉鑳藉悓鏃跺鍚屼竴涓簰鏂ュ璞″姞閿併? 浜掓枼瀵硅薄鏄繖鏍峰伐浣滅殑銆傚鏋滅嚎紼?a 璇曞浘閿佸畾涓涓簰鏂ュ璞★紝鑰屾鏃剁嚎紼?b 宸查攣瀹氫簡鍚屼竴涓簰鏂ュ璞℃椂錛岀嚎紼?a 灝卞皢榪涘叆鐫$湢鐘舵併備竴鏃︾嚎紼?b 閲婃斁浜嗕簰鏂ュ璞★紙閫氳繃 pthread_mutex_unlock() 璋冪敤錛夛紝綰跨▼ a 灝辮兘澶熼攣瀹氳繖涓簰鏂ュ璞★紙鎹㈠彞璇濊錛岀嚎紼?a 灝卞皢浠?pthread_mutex_lock() 鍑芥暟璋冪敤涓繑鍥烇紝鍚屾椂浜掓枼瀵硅薄琚攣瀹氾級(jí)銆傚悓鏍峰湴錛屽綋綰跨▼ a 姝i攣瀹氫簰鏂ュ璞℃椂錛屽鏋滅嚎紼?c 璇曞浘閿佸畾浜掓枼瀵硅薄鐨勮瘽錛岀嚎紼?c 涔熷皢涓存椂榪涘叆鐫$湢鐘舵併傚宸查攣瀹氱殑浜掓枼瀵硅薄涓婅皟鐢?pthread_mutex_lock() 鐨勬墍鏈夌嚎紼嬮兘灝嗚繘鍏ョ潯鐪犵姸鎬侊紝榪欎簺鐫$湢鐨勭嚎紼嬪皢“鎺掗槦”璁塊棶榪欎釜浜掓枼瀵硅薄銆?/p>
閫氬父浣跨敤 pthread_mutex_lock() 鍜?pthread_mutex_unlock() 鏉ヤ繚鎶ゆ暟鎹粨鏋勩傝繖灝辨槸璇達(dá)紝閫氳繃綰跨▼鐨勯攣瀹氬拰瑙i攣錛屽浜庢煇涓鏁版嵁緇撴瀯錛岀‘淇濇煇涓鏃跺埢鍙兘鏈変竴涓嚎紼嬭兘澶熻闂畠銆傚彲浠ユ帹嫻嬪埌錛屽綋綰跨▼璇曞浘閿佸畾涓涓湭鍔犻攣鐨勪簰鏂ュ璞℃椂錛孭OSIX 綰跨▼搴撳皢鍚屾剰閿佸畾錛岃屼笉浼?xì)鋴删U跨▼榪涘叆鐫$湢鐘舵併?/p>
鍥句腑錛岄攣瀹氫簡浜掓枼瀵硅薄鐨勭嚎紼嬭兘澶熷瓨鍙栧鏉傜殑鏁版嵁緇撴瀯錛岃屼笉蹇呮媴蹇冨悓鏃朵細(xì)鏈夊叾瀹冪嚎紼嬪共鎵般傞偅涓暟鎹粨鏋勫疄闄呬笂鏄?#8220;鍐葷粨”浜嗭紝鐩村埌浜掓枼瀵硅薄琚В閿佷負(fù)姝€俻thread_mutex_lock() 鍜?pthread_mutex_unlock() 鍑芥暟璋冪敤錛屽鍚?#8220;鍦ㄦ柦宸ヤ腑”鏍囧織涓鏍鳳紝灝嗘鍦ㄤ慨鏀瑰拰璇誨彇鐨勬煇涓鐗瑰畾鍏變韓鏁版嵁鍖呭洿璧鋒潵銆傝繖涓や釜鍑芥暟璋冪敤鐨勪綔鐢ㄥ氨鏄鍛婂叾瀹冪嚎紼嬶紝瑕佸畠浠戶緇潯鐪犲茍絳夊緟杞埌瀹冧滑瀵逛簰鏂ュ璞″姞閿併傚綋鐒?dòng)灱岄櫎闈炲?姣忎釜 瀵圭壒瀹氭暟鎹粨鏋勮繘琛岃鍐欐搷浣滅殑璇彞鍓嶅悗錛岄兘鍒嗗埆鏀句笂 pthread_mutex_lock() 鍜?pthread_mutext_unlock() 璋冪敤錛屾墠浼?xì)鍑虹幇杩櫩U嶆儏鍐點(diǎn)?br> 鍚笂鍘誨緢鏈夎叮錛屼絾絀剁珶涓轟粈涔堣璁╃嚎紼嬬潯鐪犲憿錛熻鐭ラ亾錛岀嚎紼嬬殑涓昏浼樼偣涓嶅氨鏄叾鍏鋒湁鐙珛宸ヤ綔銆佹洿澶氱殑鏃跺欐槸鍚屾椂宸ヤ綔鐨勮兘鍔涘悧錛熸槸鐨勶紝紜疄鏄繖鏍楓傜劧鑰岋紝姣忎釜閲嶈鐨勭嚎紼嬬▼搴忛兘闇瑕佷嬌鐢ㄦ煇浜涗簰鏂ュ璞°傝鎴戜滑鍐嶇湅涓涓嬬ず渚嬬▼搴忎互渚跨悊瑙e師鍥犳墍鍦ㄣ?/p>
璇風(fēng)湅 thread_function()錛屽驚鐜腑涓寮濮嬪氨閿佸畾浜嗕簰鏂ュ璞★紝鏈鍚庢墠灝嗗畠瑙i攣銆傚湪榪欎釜紺轟緥紼嬪簭涓紝mymutex 鐢ㄦ潵淇濇姢 myglobal 鐨勫箋備粩緇嗘煡鐪?thread_function()錛屽姞涓浠g爜鎶?myglobal 澶嶅埗鍒頒竴涓眬閮ㄥ彉閲忥紝瀵瑰眬閮ㄥ彉閲忓姞涓錛岀潯鐪犱竴縐掗挓錛屽湪榪欎箣鍚庢墠鎶婂眬閮ㄥ彉閲忕殑鍊間紶鍥炵粰 myglobal銆備笉浣跨敤浜掓枼瀵硅薄鏃訛紝鍗充嬌涓葷嚎紼嬪湪 thread_function() 綰跨▼鐫$湢涓縐掗挓鏈熼棿鍐呭 myglobal 鍔犱竴錛宼hread_function() 鑻忛啋鍚庝篃浼?xì)瑕嗙洊涓痪U跨▼鎵鍔犵殑鍊箋備嬌鐢ㄤ簰鏂ュ璞¤兘澶熶繚璇佽繖縐嶆儏褰笉浼?xì)鍙戠敓銆傦紙鎮(zhèn)ㄤ篃璁鎬細(xì)鎯沖埌錛屾垜澧炲姞浜嗕竴縐掗挓寤惰繜浠ヨЕ鍙戜笉姝g‘鐨勭粨鏋溿傛妸灞閮ㄥ彉閲忕殑鍊艱祴緇?myglobal 涔嬪墠錛屽疄闄呬笂娌℃湁浠涔堢湡姝g悊鐢辮姹?thread_function() 鐫$湢涓縐掗挓銆傦級(jí)浣跨敤浜掓枼瀵硅薄鐨勬柊紼嬪簭浜х敓浜嗘湡鏈涚殑緇撴灉錛?/p>
]]>
鏈枃鏄?POSIX 綰跨▼涓夐儴鏇茬郴鍒楃殑鏈鍚庝竴閮ㄥ垎錛孌aniel 灝嗚緇嗚璁哄浣曚嬌鐢ㄦ潯浠跺彉閲忋傛潯浠跺彉閲忔槸 POSIX 綰跨▼緇撴瀯錛屽彲浠ヨ鎮(zhèn)ㄥ湪閬囧埌鏌愪簺鏉′歡鏃?#8220;鍞ら啋”綰跨▼銆傚彲浠ュ皢瀹冧滑鐪嬩綔鏄竴縐嶇嚎紼嬪畨鍏ㄧ殑淇″彿鍙戦併侱aniel 浣跨敤鐩墠鎮(zhèn)ㄦ墍瀛﹀埌鐨勭煡璇嗗疄鐜頒簡涓涓綰跨▼宸ヤ綔緇勫簲鐢ㄧ▼搴忥紝鏈枃灝嗗洿緇曠潃榪欎竴紺轟緥鑰岃繘琛岃璁恒?/blockquote>
pthread_mutex_lock(&mymutex);
pthread_cond_wait(&mycond, &mymutex);
pthread_mutex_unlock(&mymutex);
pthread_mutex_lock(&mymutex);
pthread_cond_t mycond;
pthread_cond_init(&mycond,NULL);
pthread_cond_destroy(&mycond);
pthread_cond_wait(&mycond, &mymutex);
pthread_cond_broadcast(&mycond);
pthread_cond_signal(&mycond);
queue.h
/* queue.h
** Copyright 2000 Daniel Robbins, Gentoo Technologies, Inc.
** Author: Daniel Robbins
** Date: 16 Jun 2000
*/
typedef struct node {
struct node *next;
} node;
typedef struct queue {
node *head, *tail;
} queue;
void queue_init(queue *myroot);
void queue_put(queue *myroot, node *mynode);
node *queue_get(queue *myroot);
queue.c
/* queue.c
** Copyright 2000 Daniel Robbins, Gentoo Technologies, Inc.
** Author: Daniel Robbins
** Date: 16 Jun 2000
**
** This set of queue functions was originally thread-aware. I
** redesigned the code to make this set of queue routines
** thread-ignorant (just a generic, boring yet very fast set of queue
** routines). Why the change? Because it makes more sense to have
** the thread support as an optional add-on. Consider a situation
** where you want to add 5 nodes to the queue. With the
** thread-enabled version, each call to queue_put() would
** automatically lock and unlock the queue mutex 5 times -- that's a
** lot of unnecessary overhead. However, by moving the thread stuff
** out of the queue routines, the caller can lock the mutex once at
** the beginning, then insert 5 items, and then unlock at the end.
** Moving the lock/unlock code out of the queue functions allows for
** optimizations that aren't possible otherwise. It also makes this
** code useful for non-threaded applications.
**
** We can easily thread-enable this data structure by using the
** data_control type defined in control.c and control.h. */
#include <stdio.h>
#include "queue.h"
void queue_init(queue *myroot) {
myroot->head=NULL;
myroot->tail=NULL;
}
void queue_put(queue *myroot,node *mynode) {
mynode->next=NULL;
if (myroot->tail!=NULL)
myroot->tail->next=mynode;
myroot->tail=mynode;
if (myroot->:head==NULL)
myroot->head=mynode;
}
node *queue_get(queue *myroot) {
//get from root
node *mynode;
mynode=myroot->head;
if (myroot->head!=NULL)
myroot->head=myroot->head->next;
return mynode;
}
control.h
#include
typedef struct data_control {
pthread_mutex_t mutex;
pthread_cond_t cond;
int active;
} data_control;
鎵浣跨敤鐨?data_control 緇撴瀯
control.c
/* control.c
** Copyright 2000 Daniel Robbins, Gentoo Technologies, Inc.
** Author: Daniel Robbins
** Date: 16 Jun 2000
**
** These routines provide an easy way to make any type of
** data-structure thread-aware. Simply associate a data_control
** structure with the data structure (by creating a new struct, for
** example). Then, simply lock and unlock the mutex, or
** wait/signal/broadcast on the condition variable in the data_control
** structure as needed.
**
** data_control structs contain an int called "active". This int is
** intended to be used for a specific kind of multithreaded design,
** where each thread checks the state of "active" every time it locks
** the mutex. If active is 0, the thread knows that instead of doing
** its normal routine, it should stop itself. If active is 1, it
** should continue as normal. So, by setting active to 0, a
** controlling thread can easily inform a thread work crew to shut
** down instead of processing new jobs. Use the control_activate()
** and control_deactivate() functions, which will also broadcast on
** the data_control struct's condition variable, so that all threads
** stuck in pthread_cond_wait() will wake up, have an opportunity to
** notice the change, and then terminate.
*/
#include "control.h"
int control_init(data_control *mycontrol) {
int mystatus;
if (pthread_mutex_init(&(mycontrol->mutex),NULL))
return 1;
if (pthread_cond_init(&(mycontrol->cond),NULL))
return 1;
mycontrol->active=0;
return 0;
}
int control_destroy(data_control *mycontrol) {
int mystatus;
if (pthread_cond_destroy(&(mycontrol->cond)))
return 1;
if (pthread_cond_destroy(&(mycontrol->cond)))
return 1;
mycontrol->active=0;
return 0;
}
int control_activate(data_control *mycontrol) {
int mystatus;
if (pthread_mutex_lock(&(mycontrol->mutex)))
return 0;
mycontrol->active=1;
pthread_mutex_unlock(&(mycontrol->mutex));
pthread_cond_broadcast(&(mycontrol->cond));
return 1;
}
int control_deactivate(data_control *mycontrol) {
int mystatus;
if (pthread_mutex_lock(&(mycontrol->mutex)))
return 0;
mycontrol->active=0;
pthread_mutex_unlock(&(mycontrol->mutex));
pthread_cond_broadcast(&(mycontrol->cond));
return 1;
}
dbug.h
#define dabort() \
{ printf("Aborting at line %d in source file %s\n",__LINE__,__FILE__); abort(); }
workcrew.c
#include <stdio.h>
#include <stdlib.h>
#include "control.h"
#include "queue.h"
#include "dbug.h"
/* the work_queue holds tasks for the various threads to complete. */
struct work_queue {
data_control control;
queue work;
} wq;
/* I added a job number to the work node. Normally, the work node
would contain additional data that needed to be processed. */
typedef struct work_node {
struct node *next;
int jobnum;
} wnode;
/* the cleanup queue holds stopped threads. Before a thread
terminates, it adds itself to this list. Since the main thread is
waiting for changes in this list, it will then wake up and clean up
the newly terminated thread. */
struct cleanup_queue {
data_control control;
queue cleanup;
} cq;
/* I added a thread number (for debugging/instructional purposes) and
a thread id to the cleanup node. The cleanup node gets passed to
the new thread on startup, and just before the thread stops, it
attaches the cleanup node to the cleanup queue. The main thread
monitors the cleanup queue and is the one that performs the
necessary cleanup. */
typedef struct cleanup_node {
struct node *next;
int threadnum;
pthread_t tid;
} cnode;
void *threadfunc(void *myarg) {
wnode *mywork;
cnode *mynode;
mynode=(cnode *) myarg;
pthread_mutex_lock(&wq.control.mutex);
while (wq.control.active) {
while (wq.work.head==NULL && wq.control.active) {
pthread_cond_wait(&wq.control.cond, &wq.control.mutex);
}
if (!wq.control.active)
break;
//we got something!
mywork=(wnode *) queue_get(&wq.work);
pthread_mutex_unlock(&wq.control.mutex);
//perform processing...
printf("Thread number %d processing job %d\n",mynode->threadnum,mywork->jobnum);
free(mywork);
pthread_mutex_lock(&wq.control.mutex);
}
pthread_mutex_unlock(&wq.control.mutex);
pthread_mutex_lock(&cq.control.mutex);
queue_put(&cq.cleanup,(node *) mynode);
pthread_mutex_unlock(&cq.control.mutex);
pthread_cond_signal(&cq.control.cond);
printf("thread %d shutting down...\n",mynode->threadnum);
return NULL;
}
#define NUM_WORKERS 4
int numthreads;
void join_threads(void) {
cnode *curnode;
printf("joining threads...\n");
while (numthreads) {
pthread_mutex_lock(&cq.control.mutex);
/* below, we sleep until there really is a new cleanup node. This
takes care of any false wakeups... even if we break out of
pthread_cond_wait(), we don't make any assumptions that the
condition we were waiting for is true. */
while (cq.cleanup.head==NULL) {
pthread_cond_wait(&cq.control.cond,&cq.control.mutex);
}
/* at this point, we hold the mutex and there is an item in the
list that we need to process. First, we remove the node from
the queue. Then, we call pthread_join() on the tid stored in
the node. When pthread_join() returns, we have cleaned up
after a thread. Only then do we free() the node, decrement the
number of additional threads we need to wait for and repeat the
entire process, if necessary */
curnode = (cnode *) queue_get(&cq.cleanup);
pthread_mutex_unlock(&cq.control.mutex);
pthread_join(curnode->tid,NULL);
printf("joined with thread %d\n",curnode->threadnum);
free(curnode);
numthreads--;
}
}
int create_threads(void) {
int x;
cnode *curnode;
for (x=0; x<NUM_WORKERS; x++) {
curnode=malloc(sizeof(cnode));
if (!curnode)
return 1;
curnode->threadnum=x;
if (pthread_create(&curnode->tid, NULL, threadfunc, (void *) curnode))
return 1;
printf("created thread %d\n",x);
numthreads++;
}
return 0;
}
void initialize_structs(void) {
numthreads=0;
if (control_init(&wq.control))
dabort();
queue_init(&wq.work);
if (control_init(&cq.control)) {
control_destroy(&wq.control);
dabort();
}
queue_init(&wq.work);
control_activate(&wq.control);
}
void cleanup_structs(void) {
control_destroy(&cq.control);
control_destroy(&wq.control);
}
int main(void) {
int x;
wnode *mywork;
initialize_structs();
/* CREATION */
if (create_threads()) {
printf("Error starting threads... cleaning up.\n");
join_threads();
dabort();
}
pthread_mutex_lock(&wq.control.mutex);
for (x=0; x<16000; x++) {
mywork=malloc(sizeof(wnode));
if (!mywork) {
printf("ouch! can't malloc!\n");
break;
}
mywork->jobnum=x;
queue_put(&wq.work,(node *) mywork);
}
pthread_mutex_unlock(&wq.control.mutex);
pthread_cond_broadcast(&wq.control.cond);
printf("sleeping...\n");
sleep(2);
printf("deactivating work queue...\n");
control_deactivate(&wq.control);
/* CLEANUP */
join_threads();
cleanup_structs();
}
![]()
![]()
![]()
![]()
]]>
POSIX 綰跨▼鏄彁楂樹唬鐮佸搷搴斿拰鎬ц兘鐨勬湁鍔涙墜孌點(diǎn)傚湪姝や笁閮ㄥ垎緋誨垪鏂囩珷鐨勭浜岀瘒涓紝Daniel Robbins 灝嗚鏄庯紝濡備綍浣跨敤琚О涓轟簰鏂ュ璞$殑鐏靛閥灝忕帺鎰忥紝鏉ヤ繚鎶ょ嚎紼嬩唬鐮佷腑鍏變韓鏁版嵁緇撴瀯鐨勫畬鏁存с?/blockquote>
thread3.c
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
int myglobal;
pthread_mutex_t mymutex=PTHREAD_MUTEX_INITIALIZER;
void *thread_function(void *arg) {
int i,j;
for ( i=0; i<20; i++) {
pthread_mutex_lock(&mymutex);
j=myglobal;
j=j+1;
printf(".");
fflush(stdout);
sleep(1);
myglobal=j;
pthread_mutex_unlock(&mymutex);
}
return NULL;
}
int main(void) {
pthread_t mythread;
int i;
if ( pthread_create( &mythread, NULL, thread_function, NULL) ) {
printf("error creating thread.");
abort();
}
for ( i=0; i<20; i++) {
pthread_mutex_lock(&mymutex);
myglobal=myglobal+1;
pthread_mutex_unlock(&mymutex);
printf("o");
fflush(stdout);
sleep(1);
}
if ( pthread_join ( mythread, NULL ) ) {
printf("error joining thread.");
abort();
}
printf("\nmyglobal equals %d\n",myglobal);
exit(0);
}
璇風(fēng)湅榪欏箙杞繪澗鐨勬極鐢伙紝鍥涗釜灝忕簿鐏甸噸鐜頒簡鏈榪戜竴嬈?pthread_mutex_lock() 璋冪敤鐨勪竴涓満闈€?/strong>
$ ./thread3
o..o..o.o..o..o.o.o.o.o..o..o..o.ooooooo
myglobal equals 40
涓轟簡榪涗竴姝ユ帰绱㈣繖涓瀬涓洪噸瑕佺殑姒傚康錛岃鎴戜滑鐪嬩竴鐪嬬▼搴忎腑榪涜鍔犱竴鎿嶄綔鐨勪唬鐮侊細(xì)
thread_function() 鍔犱竴浠g爜錛?
j=myglobal;
j=j+1;
printf(".");
fflush(stdout);
sleep(1);
myglobal=j;
涓葷嚎紼嬪姞涓浠g爜錛?
myglobal=myglobal+1;
|
濡傛灉浠g爜鏄綅浜庡崟綰跨▼紼嬪簭涓紝鍙互棰勬湡 thread_function() 浠g爜灝嗗畬鏁存墽琛屻傛帴涓嬫潵鎵嶄細(xì)鎵ц涓葷嚎紼嬩唬鐮侊紙鎴栬呮槸浠ョ浉鍙嶇殑欏哄簭鎵ц錛夈傚湪涓嶄嬌鐢ㄤ簰鏂ュ璞$殑綰跨▼紼嬪簭涓紝浠g爜鍙兘錛堝嚑涔庢槸錛岀敱浜庤皟鐢ㄤ簡 sleep() 鐨勭紭鏁咃級(jí)浠ュ涓嬬殑欏哄簭鎵ц錛?/p>
thread_function() 綰跨▼ 涓葷嚎紼?
j=myglobal;
j=j+1;
printf(".");
fflush(stdout);
sleep(1); myglobal=myglobal+1;
myglobal=j;
|
褰撲唬鐮佷互姝ょ壒瀹氶『搴忔墽琛屾椂錛屽皢瑕嗙洊涓葷嚎紼嬪 myglobal 鐨勪慨鏀廣傜▼搴忕粨鏉熷悗錛屽氨灝嗗緱鍒頒笉姝g‘鐨勫箋傚鏋滄槸鍦ㄦ搷綰墊寚閽堢殑璇濓紝灝卞彲鑳戒駭鐢熸閿欒銆傛敞鎰忓埌 thread_function() 綰跨▼鎸夐『搴忔墽琛屼簡瀹冪殑鎵鏈夋寚浠ゃ傜湅鏉ヤ笉璞℃槸 thread_function() 鏈変粈涔堟搴忛鍊掋傞棶棰樻槸錛屽悓涓鏃墮棿鍐咃紝鍙︿竴涓嚎紼嬪鍚屼竴鏁版嵁緇撴瀯榪涜浜嗗彟涓涓慨鏀廣?/p>
鍦ㄨВ閲婂浣曠‘瀹氬湪浣曞浣跨敤浜掓枼瀵硅薄涔嬪墠錛屽厛鏉ユ繁鍏ヤ簡瑙d竴涓嬬嚎紼嬬殑鍐呴儴宸ヤ綔鏈哄埗銆傝鐪嬬涓涓緥瀛愶細(xì)
鍋囪涓葷嚎紼嬪皢鍒涘緩涓変釜鏂扮嚎紼嬶細(xì)綰跨▼ a銆佺嚎紼?b 鍜岀嚎紼?c銆傚亣瀹氶鍏堝垱寤虹嚎紼?a錛岀劧鍚庢槸綰跨▼ b錛屾渶鍚庡垱寤虹嚎紼?c銆?/p>
pthread_create( &thread_a, NULL, thread_function, NULL);
pthread_create( &thread_b, NULL, thread_function, NULL);
pthread_create( &thread_c, NULL, thread_function, NULL);
|
鍦ㄧ涓涓?pthread_create() 璋冪敤瀹屾垚鍚庯紝鍙互鍋囧畾綰跨▼ a 涓嶆槸宸插瓨鍦ㄥ氨鏄凡緇撴潫騫跺仠姝€傜浜屼釜 pthread_create() 璋冪敤鍚庯紝涓葷嚎紼嬪拰綰跨▼ b 閮藉彲浠ュ亣瀹氱嚎紼?a 瀛樺湪錛堟垨宸插仠姝級(jí)銆?/p>
鐒惰岋紝灝卞湪絎簩涓?create() 璋冪敤榪斿洖鍚庯紝涓葷嚎紼嬫棤娉曞亣瀹氭槸鍝竴涓嚎紼嬶紙a 鎴?b錛変細(xì)棣栧厛寮濮嬭繍琛屻傝櫧鐒朵袱涓嚎紼嬮兘宸插瓨鍦紝綰跨▼ CPU 鏃墮棿鐗囩殑鍒嗛厤鍙栧喅浜庡唴鏍稿拰綰跨▼搴撱傝嚦浜庤皝灝嗛鍏堣繍琛岋紝騫舵病鏈変弗鏍肩殑瑙勫垯銆傚敖綆$嚎紼?a 鏇存湁鍙兘鍦ㄧ嚎紼?b 涔嬪墠寮濮嬫墽琛岋紝浣嗚繖騫舵棤淇濊瘉銆傚浜庡澶勭悊鍣ㄧ郴緇燂紝鎯呭喌鏇存槸濡傛銆傚鏋滅紪鍐欑殑浠g爜鍋囧畾鍦ㄧ嚎紼?b 寮濮嬫墽琛屼箣鍓嶅疄闄呬笂鎵ц綰跨▼ a 鐨勪唬鐮侊紝閭d箞錛岀▼搴忔渶緇堟紜繍琛岀殑姒傜巼鏄?99%銆傛垨鑰呮洿緋熺硶錛岀▼搴忓湪鎮(zhèn)ㄧ殑鏈哄櫒涓?100% 鍦版紜繍琛岋紝鑰屽湪鎮(zhèn)ㄥ鎴風(fēng)殑鍥涘鐞嗗櫒鏈嶅姟鍣ㄤ笂姝g‘榪愯鐨勬鐜囧嵈鏄浂銆?/p>
浠庤繖涓緥瀛愯繕鍙互寰楃煡錛岀嚎紼嬪簱淇濈暀浜嗘瘡涓崟鐙嚎紼嬬殑浠g爜鎵ц欏哄簭銆傛崲鍙ヨ瘽璇達(dá)紝瀹為檯涓婇偅涓変釜 pthread_create() 璋冪敤灝嗘寜瀹冧滑鍑虹幇鐨勯『搴忔墽琛屻備粠涓葷嚎紼嬩笂鏉ョ湅錛屾墍鏈変唬鐮侀兘鏄緷嬈℃墽琛岀殑銆傛湁鏃訛紝鍙互鍒╃敤榪欎竴鐐規(guī)潵浼樺寲閮ㄥ垎綰跨▼紼嬪簭銆備緥濡傦紝鍦ㄤ笂渚嬩腑錛岀嚎紼?c 灝卞彲浠ュ亣瀹氱嚎紼?a 鍜岀嚎紼?b 涓嶆槸姝e湪榪愯灝辨槸宸茬粡緇堟銆傚畠涓嶅繀鎷呭績瀛樺湪榪樻病鏈夊垱寤虹嚎紼?a 鍜岀嚎紼?b 鐨勫彲鑳芥с傚彲浠ヤ嬌鐢ㄨ繖涓閫昏緫鏉ヤ紭鍖栫嚎紼嬬▼搴忋?/p>
鐜板湪鏉ョ湅鍙︿竴涓亣鎯崇殑渚嬪瓙銆傚亣璁炬湁璁稿綰跨▼錛屼粬浠兘姝e湪鎵ц涓嬪垪浠g爜錛?/p>
myglobal=myglobal+1;
|
閭d箞錛屾槸鍚﹂渶瑕佸湪鍔犱竴鎿嶄綔璇彞鍓嶅悗鍒嗗埆閿佸畾鍜岃В閿佷簰鏂ュ璞″憿錛熶篃璁告湁浜轟細(xì)璇?#8220;涓?#8221;銆傜紪璇戝櫒鏋佹湁鍙兘鎶婁笂榪拌祴鍊艱鍙ョ紪璇戞垚涓鏉℃満鍣ㄦ寚浠ゃ傚ぇ瀹墮兘鐭ラ亾錛屼笉鍙兘"鍗婇?涓柇涓鏉℃満鍣ㄦ寚浠ゃ傚嵆浣挎槸紜歡涓柇涔熶笉浼?xì)鐮村潖鏈哄櫒鎸囦护鐨勫畬鏁存с傚熀浜庝互涓婅冭檻錛屽緢鍙兘鍊懼悜浜庡畬鍏ㄧ渷鐣?pthread_mutex_lock() 鍜?pthread_mutex_unlock() 璋冪敤銆備笉瑕佽繖鏍峰仛銆?/p>
鎴戝湪璇村簾璇濆悧錛熶笉瀹屽叏鏄繖鏍楓傞鍏堬紝涓嶅簲璇ュ亣瀹氫笂榪拌祴鍊艱鍙ヤ竴瀹氫細(xì)琚紪璇戞垚涓鏉℃満鍣ㄦ寚浠わ紝闄ら潪浜茶嚜楠岃瘉浜嗘満鍣ㄤ唬鐮併傚嵆浣挎彃鍏ユ煇浜涘唴宓屾眹緙栬鍙ヤ互紜繚鍔犱竴鎿嶄綔鐨勫畬鏁存墽琛屸曗曠敋鑷籌紝鍗充嬌鏄嚜宸卞姩鎵嬪啓緙栬瘧鍣紒-- 浠嶇劧鍙兘鏈夐棶棰樸?/p>
絳旀鍦ㄨ繖閲屻備嬌鐢ㄥ崟鏉″唴宓屾眹緙栨搷浣滅爜鍦ㄥ崟澶勭悊鍣ㄧ郴緇熶笂鍙兘涓嶄細(xì)鏈変粈涔堥棶棰樸傛瘡涓姞涓鎿嶄綔閮藉皢瀹屾暣鍦拌繘琛岋紝騫朵笖澶氬崐浼?xì)寰楀埌鏈熸湜鐨劸l撴灉銆備絾鏄澶勭悊鍣ㄧ郴緇熷垯鎴劧涓嶅悓銆傚湪澶?CPU 鏈哄櫒涓婏紝涓や釜鍗曠嫭鐨勫鐞嗗櫒鍙兘浼?xì)鍦ㄥ嚑涔庡悓涓鏃跺埢錛堟垨鑰咃紝灝卞湪鍚屼竴鏃跺埢錛夋墽琛屼笂榪拌祴鍊艱鍙ャ備笉瑕佸繕浜嗭紝榪欐椂瀵瑰唴瀛樼殑淇敼闇瑕佸厛浠?L1 鍐欏叆 L2 楂橀熺紦瀛樸佺劧鍚庢墠鍐欏叆涓誨瓨銆傦紙SMP 鏈哄櫒騫朵笉鍙槸澧炲姞浜嗗鐞嗗櫒鑰屽凡錛涘畠榪樻湁鐢ㄦ潵浠茶瀵?RAM 瀛樺彇鐨勭壒孌婄‖浠躲傦級(jí)鏈緇堬紝鏍規(guī)湰鏃犳硶鎼炴竻鍦ㄥ啓鍏ヤ富瀛樼殑绔炰簤涓紝鍝釜 CPU 灝嗕細(xì)"鑳滃嚭"銆傝浜х敓鍙嫻嬬殑浠g爜錛屽簲浣跨敤浜掓枼瀵硅薄銆備簰鏂ュ璞″皢鎻掑叆涓閬?鍐呭瓨鍏沖崱"錛岀敱瀹冩潵紜繚瀵逛富瀛樼殑鍐欏叆鎸夌収綰跨▼閿佸畾浜掓枼瀵硅薄鐨勯『搴忚繘琛屻?/p>
鑰冭檻涓縐嶄互 32 浣嶅潡涓哄崟浣嶆洿鏂頒富瀛樼殑 SMP 浣撶郴緇撴瀯銆傚鏋滄湭浣跨敤浜掓枼瀵硅薄灝卞涓涓?64 浣嶆暣鏁拌繘琛屽姞涓鎿嶄綔錛屾暣鏁扮殑鏈楂?4 浣嶅瓧鑺傚彲鑳芥潵鑷竴涓?CPU錛岃屽叾瀹?4 涓瓧鑺傚嵈鏉ヨ嚜鍙︿竴 CPU銆傜碂緋曞惂錛佹渶緋熺硶鐨勬槸錛屼嬌鐢ㄥ樊鍔茬殑鎶鏈紝鎮(zhèn)ㄧ殑紼嬪簭鍦ㄩ噸瑕佸鎴風(fēng)殑緋葷粺涓婃湁鍙兘涓嶆槸寰堥暱鏃墮棿鎵嶅穿婧冧竴嬈★紝灝辨槸鏃╀笂涓夌偣閽熷氨宕╂簝銆侱avid R. Butenhof 鍦ㄤ粬鐨勩奝OSIX 綰跨▼緙栫▼銆嬶紙璇峰弬闃呮湰鏂囨湯灝劇殑 鍙傝冭祫鏂?/font>閮ㄥ垎錛変竴涔︿腑錛岃璁轟簡鐢變簬鏈嬌鐢ㄤ簰鏂ュ璞¤屽皢浜х敓鐨勭縐嶆儏鍐點(diǎn)?
濡傛灉鏀劇疆浜嗚繃澶氱殑浜掓枼瀵硅薄錛屼唬鐮佸氨娌℃湁浠涔堝茍鍙戞у彲璦錛岃繍琛岃搗鏉ヤ篃姣斿崟綰跨▼瑙e喅鏂規(guī)鎱€傚鏋滄斁緗簡榪囧皯鐨勪簰鏂ュ璞★紝浠g爜灝嗗嚭鐜板鎬拰浠や漢灝村艾鐨勯敊璇傚垢榪愮殑鏄紝鏈変竴涓腑闂寸珛鍦恒傞鍏堬紝浜掓枼瀵硅薄鏄敤浜庝覆琛屽寲瀛樺彇*鍏變韓鏁版嵁*銆備笉瑕佸闈炲叡浜暟鎹嬌鐢ㄤ簰鏂ュ璞★紝騫朵笖錛屽鏋滅▼搴忛昏緫紜繚浠諱綍鏃跺欓兘鍙湁涓涓嚎紼嬭兘瀛樺彇鐗瑰畾鏁版嵁緇撴瀯錛岄偅涔堜篃涓嶈浣跨敤浜掓枼瀵硅薄銆?/p>
鍏舵錛屽鏋滆浣跨敤鍏變韓鏁版嵁錛岄偅涔堝湪璇匯佸啓鍏變韓鏁版嵁鏃墮兘搴斾嬌鐢ㄤ簰鏂ュ璞°傜敤 pthread_mutex_lock() 鍜?pthread_mutex_unlock() 鎶婅鍐欓儴鍒嗕繚鎶よ搗鏉ワ紝鎴栬呭湪紼嬪簭涓笉鍥哄畾鐨勫湴鏂歸殢鏈轟嬌鐢ㄥ畠浠傚浼?xì)浠庝竴涓嚎紼嬬殑瑙掑害鏉ュ瑙嗕唬鐮侊紝騫剁‘淇濈▼搴忎腑姣忎竴涓嚎紼嬪鍐呭瓨鐨勮鐐歸兘鏄竴鑷村拰鍚堥傜殑銆備負(fù)浜嗙啛鎮(zhèn)変簰鏂ュ璞$殑鐢ㄦ硶錛屾渶鍒濆彲鑳借鑺卞ソ鍑犱釜灝忔椂鏉ョ紪鍐欎唬鐮侊紝浣嗘槸寰堝揩灝變細(xì)涔?fàn)鎯q朵笖*涔?涓嶅繀澶氭兂灝辮兘澶熸紜嬌鐢ㄥ畠浠?/p>
鐜板湪璇ユ潵鐪嬬湅浣跨敤浜掓枼瀵硅薄鐨勫悇縐嶄笉鍚屾柟娉曚簡銆傝鎴戜滑浠庡垵濮嬪寲寮濮嬨傚湪 thread3.c 紺轟緥 涓紝鎴戜滑浣跨敤浜嗛潤鎬佸垵濮嬪寲鏂規(guī)硶銆傝繖闇瑕佸0鏄庝竴涓?pthread_mutex_t 鍙橀噺錛屽茍璧嬬粰瀹冨父鏁?PTHREAD_MUTEX_INITIALIZER錛?
pthread_mutex_t mymutex=PTHREAD_MUTEX_INITIALIZER;
|
寰堢畝鍗曞惂銆備絾鏄繕鍙互鍔ㄦ佸湴鍒涘緩浜掓枼瀵硅薄銆傚綋浠g爜浣跨敤 malloc() 鍒嗛厤涓涓柊鐨勪簰鏂ュ璞℃椂錛屼嬌鐢ㄨ繖縐嶅姩鎬佹柟娉曘傛鏃訛紝闈欐佸垵濮嬪寲鏂規(guī)硶鏄涓嶉氱殑錛屽茍涓斿簲褰撲嬌鐢ㄤ緥紼?pthread_mutex_init()錛?/p>
int pthread_mutex_init( pthread_mutex_t *mymutex, const pthread_mutexattr_t *attr)
|
姝e鎵紺猴紝pthread_mutex_init 鎺ュ彈涓涓寚閽堜綔涓哄弬鏁頒互鍒濆鍖栦負(fù)浜掓枼瀵硅薄錛岃鎸囬拡鎸囧悜涓鍧楀凡鍒嗛厤濂界殑鍐呭瓨鍖恒傜浜屼釜鍙傛暟錛屽彲浠ユ帴鍙椾竴涓彲閫夌殑 pthread_mutexattr_t 鎸囬拡銆傝繖涓粨鏋勫彲鐢ㄦ潵璁劇疆鍚勭浜掓枼瀵硅薄灞炴с備絾鏄氬父騫朵笉闇瑕佽繖浜涘睘鎬э紝鎵浠ユ甯稿仛娉曟槸鎸囧畾 NULL銆?/p>
涓鏃︿嬌鐢?pthread_mutex_init() 鍒濆鍖栦簡浜掓枼瀵硅薄錛屽氨搴斾嬌鐢?pthread_mutex_destroy() 娑堥櫎瀹冦俻thread_mutex_destroy() 鎺ュ彈涓涓寚鍚?pthread_mutext_t 鐨勬寚閽堜綔涓哄弬鏁幫紝騫墮噴鏀懼垱寤轟簰鏂ュ璞℃椂鍒嗛厤緇欏畠鐨勪換浣曡祫婧愩傝娉ㄦ剰錛?pthread_mutex_destroy() 涓嶄細(xì) 閲婃斁鐢ㄦ潵瀛樺偍 pthread_mutex_t 鐨勫唴瀛樸傞噴鏀捐嚜宸辯殑鍐呭瓨瀹屽叏鍙栧喅浜庢?zhèn)ㄣ傝繕蹇呴』娉ㄦ剰涓鐐癸紝pthread_mutex_init() 鍜?pthread_mutex_destroy() 鎴愬姛鏃墮兘榪斿洖闆躲?
pthread_mutex_lock(pthread_mutex_t *mutex)
|
pthread_mutex_lock() 鎺ュ彈涓涓寚鍚戜簰鏂ュ璞$殑鎸囬拡浣滀負(fù)鍙傛暟浠ュ皢鍏墮攣瀹氥傚鏋滅宸у凡緇忛攣瀹氫簡浜掓枼瀵硅薄錛岃皟鐢ㄨ呭皢榪涘叆鐫$湢鐘舵併傚嚱鏁拌繑鍥炴椂錛屽皢鍞ら啋璋冪敤鑰咃紙鏄劇劧錛夊茍涓旇皟鐢ㄨ呰繕灝嗕繚鐣欒閿併傚嚱鏁拌皟鐢ㄦ垚鍔熸椂榪斿洖闆訛紝澶辮觸鏃惰繑鍥為潪闆剁殑閿欒浠g爜銆?/p>
pthread_mutex_unlock(pthread_mutex_t *mutex)
|
pthread_mutex_unlock() 涓?pthread_mutex_lock() 鐩擱厤鍚堬紝瀹冩妸綰跨▼宸茬粡鍔犻攣鐨勪簰鏂ュ璞¤В閿併傚緇堝簲璇ュ敖蹇宸插姞閿佺殑浜掓枼瀵硅薄榪涜瑙i攣錛堜互鎻愰珮鎬ц兘錛夈傚茍涓旂粷瀵逛笉瑕佸鎮(zhèn)ㄦ湭淇濇寔閿佺殑浜掓枼瀵硅薄榪涜瑙i攣鎿嶄綔錛堝惁鍒欙紝pthread_mutex_unlock() 璋冪敤灝嗗け璐ュ茍甯︿竴涓潪闆剁殑 EPERM 榪斿洖鍊鹼級(jí)銆?/p>
pthread_mutex_trylock(pthread_mutex_t *mutex)
|
褰撶嚎紼嬫鍦ㄥ仛鍏跺畠浜嬫儏鐨勬椂鍊欙紙鐢變簬浜掓枼瀵硅薄褰撳墠鏄攣瀹氱殑錛夛紝濡傛灉甯屾湜閿佸畾浜掓枼瀵硅薄錛岃繖涓皟鐢ㄥ氨鐩稿綋鏂逛究銆傝皟鐢?pthread_mutex_trylock() 鏃跺皢灝濊瘯閿佸畾浜掓枼瀵硅薄銆傚鏋滀簰鏂ュ璞″綋鍓嶅浜庤В閿佺姸鎬侊紝閭d箞鎮(zhèn)ㄥ皢鑾峰緱璇ラ攣騫朵笖鍑芥暟灝嗚繑鍥為浂銆傜劧鑰岋紝濡傛灉浜掓枼瀵硅薄宸查攣瀹氾紝榪欎釜璋冪敤涔熶笉浼?xì)闃诲銆傚綋鐒?dòng)灱屽畠浼?xì)榪斿洖闈為浂鐨?EBUSY 閿欒鍊箋傜劧鍚庡彲浠ョ戶緇仛鍏跺畠浜嬫儏錛岀◢鍚庡啀灝濊瘯閿佸畾銆?/p>
浜掓枼瀵硅薄鏄嚎紼嬬▼搴忓繀闇鐨勫伐鍏鳳紝浣嗗畠浠茍闈炰竾鑳界殑銆備緥濡傦紝濡傛灉綰跨▼姝e湪絳夊緟鍏變韓鏁版嵁鍐呮煇涓潯浠跺嚭鐜幫紝閭d細(xì)鍙戠敓浠涔堝憿錛熶唬鐮佸彲浠ュ弽澶嶅浜掓枼瀵硅薄閿佸畾鍜岃В閿侊紝浠ユ鏌ュ肩殑浠諱綍鍙樺寲銆傚悓鏃訛紝榪樿蹇熷皢浜掓枼瀵硅薄瑙i攣錛屼互渚垮叾瀹冪嚎紼嬭兘澶熻繘琛屼換浣曞繀闇鐨勬洿鏀廣傝繖鏄竴縐嶉潪甯稿彲鎬曠殑鏂規(guī)硶錛屽洜涓虹嚎紼嬮渶瑕佸湪鍚堢悊鐨勬椂闂磋寖鍥村唴棰戠箒鍦板驚鐜嫻嬪彉鍖栥?/p>
鍦ㄦ瘡嬈℃鏌ヤ箣闂達(dá)紝鍙互璁╄皟鐢ㄧ嚎紼嬬煭鏆傚湴榪涘叆鐫$湢錛屾瘮濡傜潯鐪犱笁縐掗挓錛屼絾鏄洜姝ょ嚎紼嬩唬鐮佸氨鏃犳硶鏈蹇綔鍑哄搷搴斻傜湡姝i渶瑕佺殑鏄繖鏍蜂竴縐嶆柟娉曪紝褰撶嚎紼嬪湪絳夊緟婊¤凍鏌愪簺鏉′歡鏃朵嬌綰跨▼榪涘叆鐫$湢鐘舵併備竴鏃︽潯浠舵弧瓚籌紝榪橀渶瑕佷竴縐嶆柟娉曚互鍞ら啋鍥犵瓑寰呮弧瓚崇壒瀹氭潯浠惰岀潯鐪犵殑綰跨▼銆傚鏋滆兘澶熷仛鍒拌繖涓鐐癸紝綰跨▼浠g爜灝嗘槸闈炲父楂樻晥鐨勶紝騫朵笖涓嶄細(xì)鍗犵敤瀹濊吹鐨勪簰鏂ュ璞¢攣銆傝繖姝f槸 POSIX 鏉′歡鍙橀噺鑳藉仛鐨勪簨錛?/p>
鑰?POSIX 鏉′歡鍙橀噺灝嗘槸鎴戜笅涓綃囨枃绔犵殑涓婚錛屽叾涓皢璇存槑濡備綍姝g‘浣跨敤鏉′歡鍙橀噺銆傚埌閭f椂錛屾?zhèn)畣鎷ユ湁浜嗗垱寰忓鏉偩U跨▼紼嬪簭鎵闇鐨勫叏閮ㄨ祫婧愶紝閭d簺綰跨▼紼嬪簭鍙互妯℃嫙宸ヤ綔浜哄憳銆佽閰嶇嚎絳夌瓑銆傛棦鐒舵?zhèn)ㄥ凡缁彮憡鏉キ憡鐔熸?zhèn)夌嚎紼嬶紝鎴戝皢鍦ㄤ笅涓綃囨枃绔犱腑鍔犲揩榪涘害銆傝繖鏍鳳紝鍦ㄤ笅涓綃囨枃绔犵殑緇撳熬灝辮兘鏀句笂涓涓浉瀵瑰鏉傜殑綰跨▼紼嬪簭銆傝鍒扮瓑鍒版潯浠朵駭鐢燂紝涓嬫鍐嶈錛?/p>
|
|
Daniel Robbins 灞呬綇鍦ㄦ柊澧ㄨタ鍝ュ窞鐨?Albuquerque銆備粬鏄?Gentoo Technologies, Inc. 鐨勬昏鍏?CEO錛?Gentoo 欏圭洰鐨勬昏璁″笀錛屽鏈?MacMillan 鍑虹増涔︾睄鐨勪綔鑰咃紝鍖呮嫭錛?Caldera OpenLinux Unleashed銆?SuSE Linux Unleashed鍜?Samba Unleashed 銆侱aniel 鑷皬瀛︿簩騫寸駭璧峰氨涓庤綆楁満緇撲笅涓嶈В涔嬬紭錛岄偅鏃朵粬棣栧厛鎺ヨЕ鐨勬槸 Logo 紼嬪簭璇█錛屽茍娌夋漢浜?Pac-Man 娓告垙涓傝繖涔熻灝辨槸浠栬嚦浠婁粛鎷呬換 SONY Electronic Publishing/Psygnosis 鐨勯甯浘褰㈣璁″笀鐨勫師鍥犳墍鍦ㄣ侱aniel 鍠滄涓庡瀛?Mary 鍜屽垰鍑虹敓鐨勫コ鍎?Hadassah 涓璧峰叡娓℃椂鍏夈傚彲閫氳繃 drobbins@gentoo.org 涓?Daniel 鍙栧緱鑱旂郴銆? |
|
Daniel Robbins 灞呬綇鍦ㄦ柊澧ㄨタ鍝ュ窞鐨?Albuquerque銆備粬鏄?Gentoo Technologies, Inc. 鐨勬昏鍏?CEO錛?Gentoo 欏圭洰鐨勬昏璁″笀錛屽鏈?MacMillan 鍑虹増涔︾睄鐨勪綔鑰咃紝鍖呮嫭錛?Caldera OpenLinux Unleashed銆?SuSE Linux Unleashed鍜?Samba Unleashed 銆侱aniel 鑷皬瀛︿簩騫寸駭璧峰氨涓庤綆楁満緇撲笅涓嶈В涔嬬紭錛岄偅鏃朵粬棣栧厛鎺ヨЕ鐨勬槸 Logo 紼嬪簭璇█錛屽茍娌夋漢浜?Pac-Man 娓告垙涓傝繖涔熻灝辨槸浠栬嚦浠婁粛鎷呬換 SONY Electronic Publishing/Psygnosis 鐨勯甯浘褰㈣璁″笀鐨勫師鍥犳墍鍦ㄣ侱aniel 鍠滄涓庡瀛?Mary 鍜屽垰鍑虹敓鐨勫コ鍎?Hadassah 涓璧峰叡娓℃椂鍏夈傚彲閫氳繃 drobbins@gentoo.org 涓?Daniel 鍙栧緱鑱旂郴銆?
[鍘熸枃鍦板潃]http://www.ibm.com/developerworks/cn/linux/thread/posix_thread1/
POSIX錛堝彲縐繪鎿嶄綔緋葷粺鎺ュ彛錛夌嚎紼嬫槸鎻愰珮浠g爜鍝嶅簲鍜屾ц兘鐨勬湁鍔涙墜孌點(diǎn)傚湪鏈郴鍒椾腑錛孌aniel Robbins 鍚戞?zhèn)ň_劇‘鍦板睍紺哄湪緙栫▼涓浣曚嬌鐢ㄧ嚎紼嬨傚叾涓繕娑夊強(qiáng)澶ч噺騫曞悗緇嗚妭錛岃瀹屾湰緋誨垪鏂囩珷錛屾?zhèn)ㄥ畬鍏ㄥ彲浠q愮敤 POSIX 綰跨▼鍒涘緩澶氱嚎紼嬬▼搴忋?/p>
浜嗚В濡備綍姝g‘榪愮敤綰跨▼鏄瘡涓涓紭縐紼嬪簭鍛樺繀澶囩殑绱犺川銆傜嚎紼嬬被浼間簬榪涚▼銆傚鍚岃繘紼嬶紝綰跨▼鐢卞唴鏍告寜鏃墮棿鍒嗙墖榪涜綆$悊銆傚湪鍗曞鐞嗗櫒緋葷粺涓紝鍐呮牳浣跨敤鏃墮棿鍒嗙墖鏉ユā鎷熺嚎紼嬬殑騫跺彂鎵ц錛岃繖縐嶆柟寮忓拰榪涚▼鐨勭浉鍚屻傝屽湪澶氬鐞嗗櫒緋葷粺涓紝濡傚悓澶氫釜榪涚▼錛岀嚎紼嬪疄闄呬笂涓鏍峰彲浠ュ茍鍙戞墽琛屻?/p>
閭d箞涓轟粈涔堝浜庡ぇ澶氭暟鍚堜綔鎬т換鍔★紝澶氱嚎紼嬫瘮澶氫釜鐙珛鐨勮繘紼嬫洿浼樿秺鍛紵榪欐槸鍥犱負(fù)錛岀嚎紼嬪叡浜浉鍚岀殑鍐呭瓨絀洪棿銆備笉鍚岀殑綰跨▼鍙互瀛樺彇鍐呭瓨涓殑鍚屼竴涓彉閲忋傛墍浠ワ紝紼嬪簭涓殑鎵鏈夌嚎紼嬮兘鍙互璇繪垨鍐欏0鏄庤繃鐨勫叏灞鍙橀噺銆傚鏋滄浘鐢?fork() 緙栧啓榪囬噸瑕佷唬鐮侊紝灝變細(xì)璁よ瘑鍒拌繖涓伐鍏風(fēng)殑閲嶈鎬с備負(fù)浠涔堝憿錛熻櫧鐒?fork() 鍏佽鍒涘緩澶氫釜榪涚▼錛屼絾瀹冭繕浼?xì)甯︽潵浠ヤ笅閫氫俊闂: 濡備綍璁╁涓繘紼嬬浉浜掗氫俊錛岃繖閲屾瘡涓繘紼嬮兘鏈夊悇鑷嫭绔嬬殑鍐呭瓨絀洪棿銆傚榪欎釜闂娌℃湁涓涓畝鍗曠殑絳旀銆傝櫧鐒舵湁璁稿涓嶅悓縐嶇被鐨勬湰鍦?IPC (榪涚▼闂撮氫俊錛夛紝浣嗗畠浠兘閬囧埌涓や釜閲嶈闅滅錛?/p>
鍙岄噸鍧忎簨: 寮閿鍜屽鏉傛ч兘闈炲ソ浜嬨傚鏋滄浘緇忎負(fù)浜嗘敮鎸?IPC 鑰屽紼嬪簭澶у姩騫叉垐榪囷紝閭d箞鎮(zhèn)ㄥ氨浼?xì)鐪熸娆h祻绾拷E嬫彁渚涚殑綆鍗曞叡浜唴瀛樻満鍒躲傜敱浜庢墍鏈夌殑綰跨▼閮介┗鐣欏湪鍚屼竴鍐呭瓨絀洪棿錛孭OSIX 綰跨▼鏃犻渶榪涜寮閿澶ц屽鏉傜殑闀胯窛紱昏皟鐢ㄣ傚彧瑕佸埄鐢ㄧ畝鍗曠殑鍚屾鏈哄埗錛岀▼搴忎腑鎵鏈夌殑綰跨▼閮藉彲浠ヨ鍙栧拰淇敼宸叉湁鐨勬暟鎹粨鏋勩傝屾棤闇灝嗘暟鎹粡鐢辨枃浠舵弿榪扮杞偍鎴栨尋鍏ョ揣紿勭殑鍏變韓鍐呭瓨絀洪棿銆備粎姝や竴涓師鍥狅紝灝辮凍浠ヨ鎮(zhèn)ㄨ冭檻搴旇閲囩敤鍗曡繘紼?澶氱嚎紼嬫ā寮忚岄潪澶氳繘紼?鍗曠嚎紼嬫ā寮忋?/p>
涓嶄粎濡傛銆傜嚎紼嬪悓鏍瘋繕鏄潪甯稿揩鎹風(fēng)殑銆備笌鏍囧噯 fork() 鐩告瘮錛岀嚎紼嬪甫鏉ョ殑寮閿寰堝皬銆傚唴鏍告棤闇鍗曠嫭澶嶅埗榪涚▼鐨勫唴瀛樼┖闂存垨鏂囦歡鎻忚堪絎︾瓑絳夈傝繖灝辮妭鐪佷簡澶ч噺鐨?CPU 鏃墮棿錛屼嬌寰楃嚎紼嬪垱寤烘瘮鏂拌繘紼嬪垱寤哄揩涓婂崄鍒頒竴鐧懼嶃傚洜涓鴻繖涓鐐癸紝鍙互澶ч噺浣跨敤綰跨▼鑰屾棤闇澶繃浜庢媴蹇冨甫鏉ョ殑 CPU 鎴栧唴瀛樹笉瓚熾備嬌鐢?fork() 鏃跺鑷寸殑澶ч噺 CPU 鍗犵敤涔熶笉澶嶅瓨鍦ㄣ傝繖琛ㄧず鍙鍦ㄧ▼搴忎腑鏈夋剰涔夛紝閫氬父灝卞彲浠ュ垱寤虹嚎紼嬨?/p>
褰撶劧錛屽拰榪涚▼涓鏍鳳紝綰跨▼灝嗗埄鐢ㄥ CPU銆傚鏋滆蔣浠舵槸閽堝澶氬鐞嗗櫒緋葷粺璁捐鐨勶紝榪欏氨鐪熺殑鏄竴澶х壒鎬э紙濡傛灉杞歡鏄紑鏀炬簮鐮侊紝鍒欐渶緇堝彲鑳藉湪涓嶅皯騫沖彴涓婅繍琛岋級(jí)銆傜壒瀹氱被鍨嬬嚎紼嬬▼搴忥紙灝ゅ叾鏄?CPU 瀵嗛泦鍨嬬▼搴忥級(jí)鐨勬ц兘灝嗛殢緋葷粺涓鐞嗗櫒鐨勬暟鐩嚑涔庣嚎鎬у湴鎻愰珮銆傚鏋滄鍦ㄧ紪鍐?CPU 闈炲父瀵嗛泦鍨嬬殑紼嬪簭錛屽垯緇濆鎯寵娉曞湪浠g爜涓嬌鐢ㄥ綰跨▼銆備竴鏃︽帉鎻′簡綰跨▼緙栫爜錛屾棤闇浣跨敤綣佺悙鐨?IPC 鍜屽叾瀹冨鏉傜殑閫氫俊鏈哄埗錛屽氨鑳藉浠ュ叏鏂板拰鍒涢犳х殑鏂規(guī)硶瑙e喅緙栫爜闅鵑銆傛墍鏈夎繖浜涚壒鎬ч厤鍚堝湪涓璧蜂嬌寰楀綰跨▼緙栫▼鏇存湁瓚c佸揩閫熷拰鐏墊椿銆?/p>
濡傛灉鐔熸?zhèn)?Linux 緙栫▼錛屽氨鏈夊彲鑳界煡閬?__clone() 緋葷粺璋冪敤銆俖_clone() 綾諱技浜?fork()錛屽悓鏃朵篃鏈夎澶氱嚎紼嬬殑鐗規(guī)с備緥濡傦紝浣跨敤 __clone()錛屾柊鐨勫瓙榪涚▼鍙互鏈夐夋嫨鍦板叡浜埗榪涚▼鐨勬墽琛岀幆澧冿紙鍐呭瓨絀洪棿錛屾枃浠舵弿榪扮絳夛級(jí)銆傝繖鏄ソ鐨勪竴闈€備絾 __clone() 涔熸湁涓嶈凍涔嬪銆傛濡俖_clone() 鍦ㄧ嚎甯姪鎸囧嚭錛?/p>
“__clone 璋冪敤鏄壒瀹氫簬 Linux 騫沖彴鐨勶紝涓嶉傜敤浜庡疄鐜板彲縐繪鐨勭▼搴忋傛緙栧啓綰跨▼鍖栧簲鐢ㄧ▼搴忥紙澶氱嚎紼嬫帶鍒跺悓涓鍐呭瓨絀洪棿錛夛紝鏈濂戒嬌鐢ㄥ疄鐜?POSIX 1003.1c 綰跨▼ API 鐨勫簱錛屼緥濡?Linux-Threads 搴撱傚弬闃?pthread_create(3thr)銆?#8221;
铏界劧 __clone() 鏈夌嚎紼嬬殑璁稿鐗規(guī)э紝浣嗗畠鏄笉鍙Щ妞嶇殑銆傚綋鐒惰繖騫朵笉鎰忓懗鐫浠g爜涓笉鑳戒嬌鐢ㄥ畠銆備絾鍦ㄨ蔣浠朵腑鑰冭檻浣跨敤 __clone() 鏃跺簲褰撴潈琛¤繖涓浜嬪疄銆傚煎緱搴嗗垢鐨勬槸錛屾濡?__clone() 鍦ㄧ嚎甯姪鎸囧嚭錛屾湁涓縐嶆洿濂界殑鏇夸唬鏂規(guī)錛歅OSIX 綰跨▼銆傚鏋滄兂緙栧啓 鍙Щ妞嶇殑 澶氱嚎紼嬩唬鐮侊紝浠g爜鍙繍琛屼簬 Solaris銆丗reeBSD銆丩inux 鍜屽叾瀹冨鉤鍙幫紝POSIX 綰跨▼鏄竴縐嶅綋鐒朵箣閫夈?/p>
涓嬮潰鏄竴涓?POSIX 綰跨▼鐨勭畝鍗曠ず渚嬬▼搴忥細(xì)
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
void *thread_function(void *arg) {
int i;
for ( i=0; i<20; i++) {
printf("Thread says hi!\n");
sleep(1);
}
return NULL;
}
int main(void) {
pthread_t mythread;
if ( pthread_create( &mythread, NULL, thread_function, NULL) ) {
printf("error creating thread.");
abort();
}
if ( pthread_join ( mythread, NULL ) ) {
printf("error joining thread.");
abort();
}
exit(0);
}
|
瑕佺紪璇戣繖涓▼搴忥紝鍙渶鍏堝皢紼嬪簭瀛樹負(fù) thread1.c錛岀劧鍚庤緭鍏ワ細(xì)
$ gcc thread1.c -o thread1 -lpthread
|
榪愯鍒欒緭鍏ワ細(xì)
$ ./thread1
|
thread1.c 鏄竴涓潪甯哥畝鍗曠殑綰跨▼紼嬪簭銆傝櫧鐒跺畠娌℃湁瀹炵幇浠涔堟湁鐢ㄧ殑鍔熻兘錛屼絾鍙互甯姪鐞嗚В綰跨▼鐨勮繍琛屾満鍒躲備笅闈紝鎴戜滑涓姝ヤ竴姝ュ湴浜嗚В榪欎釜紼嬪簭鏄共浠涔堢殑銆俶ain() 涓0鏄庝簡鍙橀噺 mythread錛岀被鍨嬫槸 pthread_t銆俻thread_t 綾誨瀷鍦?pthread.h 涓畾涔夛紝閫氬父縐頒負(fù)“綰跨▼ id”錛堢緝鍐欎負(fù) "tid"錛夈傚彲浠ヨ涓哄畠鏄竴縐嶇嚎紼嬪彞鏌勩?/p>
mythread 澹版槑鍚庯紙璁頒綇 mythread 鍙槸涓涓?"tid"錛屾垨鏄皢瑕佸垱寤虹殑綰跨▼鐨勫彞鏌勶級(jí)錛岃皟鐢?pthread_create 鍑芥暟鍒涘緩涓涓湡瀹炴椿鍔ㄧ殑綰跨▼銆備笉瑕佸洜涓?pthread_create() 鍦?"if" 璇彞鍐呰屽彈鍏惰糠鎯戙傜敱浜?pthread_create() 鎵ц鎴愬姛鏃惰繑鍥為浂鑰屽け璐ユ椂鍒欒繑鍥為潪闆跺鹼紝灝?pthread_create() 鍑芥暟璋冪敤鏀懼湪 if() 璇彞涓彧鏄負(fù)浜嗘柟渚垮湴媯(gè)嫻嬪け璐ョ殑璋冪敤銆傝鎴戜滑鏌ョ湅涓涓?pthread_create 鍙傛暟銆傜涓涓弬鏁?&mythread 鏄寚鍚?mythread 鐨勬寚閽堛傜浜屼釜鍙傛暟褰撳墠涓?NULL錛屽彲鐢ㄦ潵瀹氫箟綰跨▼鐨勬煇浜涘睘鎬с傜敱浜庣己鐪佺殑綰跨▼灞炴ф槸閫傜敤鐨勶紝鍙渶灝嗚鍙傛暟璁句負(fù) NULL銆?/p>
絎笁涓弬鏁版槸鏂扮嚎紼嬪惎鍔ㄦ椂璋冪敤鐨勫嚱鏁板悕銆傛湰渚嬩腑錛屽嚱鏁板悕涓?thread_function()銆傚綋 thread_function() 榪斿洖鏃訛紝鏂扮嚎紼嬪皢緇堟銆傛湰渚嬩腑錛岀嚎紼嬪嚱鏁版病鏈夊疄鐜板ぇ鐨勫姛鑳姐傚畠浠呭皢 "Thread says hi!" 杈撳嚭 20 嬈$劧鍚庨鍑恒傛敞鎰?thread_function() 鎺ュ彈 void * 浣滀負(fù)鍙傛暟錛屽悓鏃惰繑鍥炲肩殑綾誨瀷涔熸槸 void *銆傝繖琛ㄦ槑鍙互鐢?void * 鍚戞柊綰跨▼浼犻掍換鎰忕被鍨嬬殑鏁版嵁錛屾柊綰跨▼瀹屾垚鏃朵篃鍙繑鍥炰換鎰忕被鍨嬬殑鏁版嵁銆傞偅濡備綍鍚戠嚎紼嬩紶閫掍竴涓換鎰忓弬鏁幫紵寰堢畝鍗曘傚彧瑕佸埄鐢?pthread_create() 涓殑絎洓涓弬鏁般傛湰渚嬩腑錛屽洜涓烘病鏈夊繀瑕佸皢浠諱綍鏁版嵁浼犵粰寰笉瓚抽亾鐨?thread_function()錛屾墍浠ュ皢絎洓涓弬鏁拌涓?NULL銆?/p>
鎮(zhèn)ㄤ篃璁稿凡鎺ㄦ祴鍒幫紝鍦?pthread_create() 鎴愬姛榪斿洖涔嬪悗錛岀▼搴忓皢鍖呭惈涓や釜綰跨▼銆傜瓑涓絳夛紝 涓や釜 綰跨▼錛熸垜浠笉鏄彧鍒涘緩浜嗕竴涓嚎紼嬪悧錛熶笉閿欙紝鎴戜滑鍙垱寤轟簡涓涓繘紼嬨備絾鏄富紼嬪簭鍚屾牱涔熸槸涓涓嚎紼嬨傚彲浠ヨ繖鏍風(fēng)悊瑙o細(xì)濡傛灉緙栧啓鐨勭▼搴忔牴鏈病鏈変嬌鐢?POSIX 綰跨▼錛屽垯璇ョ▼搴忔槸鍗曠嚎紼嬬殑錛堣繖涓崟綰跨▼縐頒負(fù)“涓?#8221;綰跨▼錛夈傚垱寤轟竴涓柊綰跨▼涔嬪悗紼嬪簭鎬誨叡灝辨湁涓や釜綰跨▼浜嗐?
鎴戞兂姝ゆ椂鎮(zhèn)ㄨ嚦灝戞湁涓や釜閲嶈闂銆傜涓涓棶棰橈紝鏂扮嚎紼嬪垱寤轟箣鍚庝富綰跨▼濡備綍榪愯銆傜瓟妗堬紝涓葷嚎紼嬫寜欏哄簭緇х畫鎵ц涓嬩竴琛岀▼搴忥紙鏈緥涓墽琛?"if (pthread_join(...))"錛夈傜浜屼釜闂錛屾柊綰跨▼緇撴潫鏃跺浣曞鐞嗐傜瓟妗堬紝鏂扮嚎紼嬪厛鍋滄錛岀劧鍚庝綔涓哄叾娓呯悊榪囩▼鐨勪竴閮ㄥ垎錛岀瓑寰呬笌鍙︿竴涓嚎紼嬪悎騫舵垨“榪炴帴”銆?/p>
鐜板湪錛屾潵鐪嬩竴涓?pthread_join()銆傛濡?pthread_create() 灝嗕竴涓嚎紼嬫媶鍒嗕負(fù)涓や釜錛?pthread_join() 灝嗕袱涓嚎紼嬪悎騫朵負(fù)涓涓嚎紼嬨俻thread_join() 鐨勭涓涓弬鏁版槸 tid mythread銆傜浜屼釜鍙傛暟鏄寚鍚?void 鎸囬拡鐨勬寚閽堛傚鏋?void 鎸囬拡涓嶄負(fù) NULL錛宲thread_join 灝嗙嚎紼嬬殑 void * 榪斿洖鍊兼斁緗湪鎸囧畾鐨勪綅緗笂銆傜敱浜庢垜浠笉蹇呯悊浼?thread_function() 鐨勮繑鍥炲鹼紝鎵浠ュ皢鍏惰涓?NULL.
鎮(zhèn)ㄤ細(xì)娉ㄦ剰鍒?thread_function() 鑺變簡 20 縐掓墠瀹屾垚銆傚湪 thread_function() 緇撴潫寰堜箙涔嬪墠錛屼富綰跨▼灝卞凡緇忚皟鐢ㄤ簡 pthread_join()銆傚鏋滃彂鐢熻繖縐嶆儏鍐碉紝涓葷嚎紼嬪皢涓柇錛堣漿鍚戠潯鐪狅級(jí)鐒跺悗絳夊緟 thread_function() 瀹屾垚銆傚綋 thread_function() 瀹屾垚鍚? pthread_join() 灝嗚繑鍥炪傝繖鏃剁▼搴忓張鍙湁涓涓富綰跨▼銆傚綋紼嬪簭閫鍑烘椂錛屾墍鏈夋柊綰跨▼宸茬粡浣跨敤 pthread_join() 鍚堝茍浜嗐傝繖灝辨槸搴旇濡備綍澶勭悊鍦ㄧ▼搴忎腑鍒涘緩鐨勬瘡涓柊綰跨▼鐨勮繃紼嬨傚鏋滄病鏈夊悎騫朵竴涓柊綰跨▼錛屽垯瀹冧粛鐒跺緋葷粺鐨勬渶澶х嚎紼嬫暟闄愬埗涓嶅埄銆傝繖鎰忓懗鐫濡傛灉鏈綰跨▼鍋氭紜殑娓呯悊錛屾渶緇堜細(xì)瀵艱嚧 pthread_create() 璋冪敤澶辮觸銆?/p>
濡傛灉浣跨敤榪?fork() 緋葷粺璋冪敤錛屽彲鑳界啛鎮(zhèn)夌埗榪涚▼鍜屽瓙榪涚▼鐨勬蹇點(diǎn)傚綋鐢?fork() 鍒涘緩鍙︿竴涓柊榪涚▼鏃訛紝鏂拌繘紼嬫槸瀛愯繘紼嬶紝鍘熷榪涚▼鏄埗榪涚▼銆傝繖鍒涘緩浜嗗彲鑳介潪甯告湁鐢ㄧ殑灞傛鍏崇郴錛屽挨鍏舵槸絳夊緟瀛愯繘紼嬬粓姝㈡椂銆備緥濡傦紝waitpid() 鍑芥暟璁╁綋鍓嶈繘紼嬬瓑寰呮墍鏈夊瓙榪涚▼緇堟銆倃aitpid() 鐢ㄦ潵鍦ㄧ埗榪涚▼涓疄鐜扮畝鍗曠殑娓呯悊榪囩▼銆?/p>
鑰?POSIX 綰跨▼灝辨洿鏈夋剰鎬濄傛?zhèn)ㄥ彲鑳藉凡缁忔敞鎰忓埌鎴戜竴鐩存湁鎰忛伩鍏嶄嬌鐢?#8220;鐖剁嚎紼?#8221;鍜?#8220;瀛愮嚎紼?#8221;鐨勮娉曘傝繖鏄洜涓?POSIX 綰跨▼涓笉瀛樺湪榪欑灞傛鍏崇郴銆傝櫧鐒朵富綰跨▼鍙互鍒涘緩涓涓柊綰跨▼錛屾柊綰跨▼鍙互鍒涘緩鍙︿竴涓柊綰跨▼錛孭OSIX 綰跨▼鏍囧噯灝嗗畠浠涓虹瓑鍚岀殑灞傛銆傛墍浠ョ瓑寰呭瓙綰跨▼閫鍑虹殑姒傚康鍦ㄨ繖閲屾病鏈夋剰涔夈侾OSIX 綰跨▼鏍囧噯涓嶈褰曚換浣?#8220;瀹舵棌”淇℃伅銆傜己灝戝鏃忎俊鎭湁涓涓富瑕佸惈鎰忥細(xì)濡傛灉瑕佺瓑寰呬竴涓嚎紼嬬粓姝紝灝卞繀欏誨皢綰跨▼鐨?tid 浼犻掔粰 pthread_join()銆傜嚎紼嬪簱鏃犳硶涓烘?zhèn)ㄦ柇瀹?tid銆?/p>
瀵瑰ぇ澶氭暟寮鍙戣呮潵璇磋繖涓嶆槸涓ソ娑堟伅錛屽洜涓鴻繖浼?xì)鋴涉湁澶氫釜绾拷E嬬殑紼嬪簭澶嶆潅鍖栥備笉榪囦笉瑕佷負(fù)姝ゆ媴蹇с侾OSIX 綰跨▼鏍囧噯鎻愪緵浜嗘湁鏁堝湴綆$悊澶氫釜綰跨▼鎵闇瑕佺殑鎵鏈夊伐鍏楓傚疄闄呬笂錛屾病鏈夌埗/瀛愬叧緋昏繖涓浜嬪疄鍗翠負(fù)鍦ㄧ▼搴忎腑浣跨敤綰跨▼寮杈熶簡鏇村垱閫犳х殑鏂規(guī)硶銆備緥濡傦紝濡傛灉鏈変竴涓嚎紼嬬О涓虹嚎紼?1錛岀嚎紼?1 鍒涘緩浜嗙О涓虹嚎紼?2 鐨勭嚎紼嬶紝鍒欑嚎紼?1 鑷繁娌℃湁蹇呰璋冪敤 pthread_join() 鏉ュ悎騫剁嚎紼?2錛岀▼搴忎腑鍏跺畠浠諱竴綰跨▼閮藉彲浠ュ仛鍒般傚綋緙栧啓澶ч噺浣跨敤綰跨▼鐨勪唬鐮佹椂錛岃繖灝卞彲鑳藉厑璁稿彂鐢熸湁瓚g殑浜嬫儏銆備緥濡傦紝鍙互鍒涘緩涓涓寘鍚墍鏈夊凡鍋滄綰跨▼鐨勫叏灞“姝葷嚎紼嬪垪琛?#8221;錛岀劧鍚庤涓涓笓闂ㄧ殑娓呯悊綰跨▼涓撶瓑鍋滄鐨勭嚎紼嬪姞鍒板垪琛ㄤ腑銆傝繖涓竻鐞嗙嚎紼嬭皟鐢?pthread_join() 灝嗗垰鍋滄鐨勭嚎紼嬩笌鑷繁鍚堝茍銆傜幇鍦紝浠呯敤涓涓嚎紼嬪氨宸у鍜屾湁鏁堝湴澶勭悊浜嗗叏閮ㄦ竻鐞嗐?br>
鐜板湪鎴戜滑鏉ョ湅涓浜涗唬鐮侊紝榪欎簺浠g爜鍋氫簡涓浜涙剰鎯充笉鍒扮殑浜嬫儏銆倀hread2.c 鐨勪唬鐮佸涓嬶細(xì)
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
int myglobal;
void *thread_function(void *arg) {
int i,j;
for ( i=0; i<20; i++) {
j=myglobal;
j=j+1;
printf(".");
fflush(stdout);
sleep(1);
myglobal=j;
}
return NULL;
}
int main(void) {
pthread_t mythread;
int i;
if ( pthread_create( &mythread, NULL, thread_function, NULL) ) {
printf("error creating thread.");
abort();
}
for ( i=0; i<20; i++) {
myglobal=myglobal+1;
printf("o");
fflush(stdout);
sleep(1);
}
if ( pthread_join ( mythread, NULL ) ) {
printf("error joining thread.");
abort();
}
printf("\nmyglobal equals %d\n",myglobal);
exit(0);
}
|
濡傚悓絎竴涓▼搴忥紝榪欎釜紼嬪簭鍒涘緩涓涓柊綰跨▼銆備富綰跨▼鍜屾柊綰跨▼閮藉皢鍏ㄥ眬鍙橀噺 myglobal 鍔犱竴 20 嬈°備絾鏄▼搴忔湰韜駭鐢熶簡鏌愪簺鎰忔兂涓嶅埌鐨勭粨鏋溿傜紪璇戜唬鐮佽杈撳叆錛?/p>
$ gcc thread2.c -o thread2 -lpthread
|
榪愯璇瘋緭鍏ワ細(xì)
$ ./thread2
|
杈撳嚭錛?/p>
$ ./thread2
..o.o.o.o.oo.o.o.o.o.o.o.o.o.o..o.o.o.o.o
myglobal equals 21
|
闈炲父鎰忓鍚э紒鍥犱負(fù) myglobal 浠庨浂寮濮嬶紝涓葷嚎紼嬪拰鏂扮嚎紼嬪悇鑷鍏惰繘琛屼簡 20 嬈″姞涓, 紼嬪簭緇撴潫鏃?myglobal 鍊煎簲褰撶瓑浜?40銆傜敱浜?myglobal 杈撳嚭緇撴灉涓?21錛岃繖鍏朵腑鑲畾鏈夐棶棰樸備絾鏄┒绔熸槸浠涔堝憿錛?/p>
鏀懼純鍚楋紵濂斤紝璁╂垜鏉ヨВ閲婃槸鎬庝箞涓鍥炰簨銆傞鍏堟煡鐪嬪嚱鏁?thread_function()銆傛敞鎰忓浣曞皢 myglobal 澶嶅埗鍒板眬閮ㄥ彉閲?"j" 浜嗗悧? 鎺ョ潃灝?j 鍔犱竴, 鍐嶇潯鐪犱竴縐掞紝鐒跺悗鍒拌繖鏃舵墠灝嗘柊鐨?j 鍊煎鍒跺埌 myglobal錛熻繖灝辨槸鍏抽敭鎵鍦ㄣ傝鎯充竴涓嬶紝濡傛灉涓葷嚎紼嬪氨鍦ㄦ柊綰跨▼灝?myglobal 鍊煎鍒剁粰 j 鍚?/strong> 绔嬪嵆灝?myglobal 鍔犱竴錛屼細(xì)鍙戠敓浠涔堬紵褰?thread_function() 灝?j 鐨勫煎啓鍥?myglobal 鏃訛紝灝辮鐩栦簡涓葷嚎紼嬫墍鍋氱殑淇敼銆?
褰撶紪鍐欑嚎紼嬬▼搴忔椂錛屽簲閬垮厤浜х敓榪欑鏃犵敤鐨勫壇浣滅敤錛屽惁鍒欏彧浼?xì)娴匆?guī)椂闂達(dá)紙褰撶劧錛岄櫎浜嗙紪鍐欏叧浜?POSIX 綰跨▼鐨勬枃绔犳椂鏈夌敤錛夈傞偅涔堬紝濡備綍鎵嶈兘鎺掗櫎榪欑闂鍛紵
鐢變簬鏄皢 myglobal 澶嶅埗緇?j 騫朵笖絳変簡涓縐掍箣鍚庢墠鍐欏洖鏃朵駭鐢熼棶棰橈紝鍙互灝濊瘯閬垮厤浣跨敤涓存椂灞閮ㄥ彉閲忓茍鐩存帴灝?myglobal 鍔犱竴銆傝櫧鐒惰繖縐嶈В鍐蟲柟妗堝榪欎釜鐗瑰畾渚嬪瓙閫傜敤錛屼絾瀹冭繕鏄笉姝g‘銆傚鏋滄垜浠 myglobal 榪涜鐩稿澶嶆潅鐨勬暟瀛﹁繍綆楋紝鑰屼笉鏄畝鍗曠殑鍔犱竴錛岃繖縐嶆柟娉曞氨浼?xì)澶辨晥銆備絾鏄負(fù)浠涔堝憿錛?/p>
瑕佺悊瑙h繖涓棶棰橈紝蹇呴』璁頒綇綰跨▼鏄茍鍙戣繍琛岀殑銆傚嵆浣垮湪鍗曞鐞嗗櫒緋葷粺涓婅繍琛岋紙鍐呮牳鍒╃敤鏃墮棿鍒嗙墖妯℃嫙澶氫換鍔★級(jí)涔熸槸鍙互鐨勶紝浠庣▼搴忓憳鐨勮搴︼紝鎯沖儚涓や釜綰跨▼鏄悓鏃舵墽琛岀殑銆倀hread2.c 鍑虹幇闂鏄洜涓?thread_function() 渚濊禆浠ヤ笅璁烘嵁錛氬湪 myglobal 鍔犱竴涔嬪墠鐨勫ぇ綰︿竴縐掗挓鏈熼棿涓嶄細(xì)淇敼 myglobal銆傞渶瑕佹湁浜涢斿緞璁╀竴涓嚎紼嬪湪瀵?myglobal 鍋氭洿鏀規(guī)椂閫氱煡鍏跺畠綰跨▼“涓嶈闈犺繎”銆傛垜灝嗗湪涓嬩竴綃囨枃绔犱腑璁茶В濡備綍鍋氬埌榪欎竴鐐廣傚埌鏃跺欒銆?/p>
|
|
Daniel Robbins 灞呬綇鍦ㄦ柊澧ㄨタ鍝ュ窞鐨?Albuquerque銆備粬鏄?Gentoo Technologies, Inc. 鐨勬昏鍏?CEO錛?Gentoo 欏圭洰鐨勬昏璁″笀錛屽鏈?MacMillan 鍑虹増涔︾睄鐨勪綔鑰咃紝鍖呮嫭錛?Caldera OpenLinux Unleashed銆?SuSE Linux Unleashed鍜?Samba Unleashed 銆侱aniel 鑷皬瀛︿簩騫寸駭璧峰氨涓庤綆楁満緇撲笅涓嶈В涔嬬紭錛岄偅鏃朵粬棣栧厛鎺ヨЕ鐨勬槸 Logo 紼嬪簭璇█錛屽茍娌夋漢浜?Pac-Man 娓告垙涓傝繖涔熻灝辨槸浠栬嚦浠婁粛鎷呬換 SONY Electronic Publishing/Psygnosis 鐨勯甯浘褰㈣璁″笀鐨勫師鍥犳墍鍦ㄣ侱aniel 鍠滄涓庡瀛?Mary 鍜屽垰鍑虹敓鐨勫コ鍎?Hadassah 涓璧峰叡娓℃椂鍏夈傚彲閫氳繃 drobbins@gentoo.org 涓?Daniel Robbins 鍙栧緱鑱旂郴銆? |
|
bool msg_recv_thread(void)

{
int max = 0;
fd_set readfds; // 緇撴灉闆?/span>
struct timeval RevTimeOut;
RevTimeOut.tv_sec = 1; // 璁懼畾select鐨勮秴鏃舵椂闂翠負(fù)1s
RevtimeOut.tv_usec = 0;
while(1)
{
FD_SET(conn_socket, &readfds);
max = (max > conn_socket) ? max : conn_socket;
int ret = select(max+1, &readfds, NULL, NULL, &RevTimeOut);
if (ret <= 0)
{
continue;
}
if (FD_ISSET(conn_socket, &readfds) != 0)
{
// 鎺ュ彈榪炴帴璇鋒眰澶勭悊……
}
// 鍏朵粬澶勭悊……
}