linux系統(tǒng)課程-課件09day09線程同步2其他

讀寫(xiě)鎖的特點(diǎn)：讀共享，寫(xiě)?yīng)氄迹瑢?xiě)優(yōu)先級(jí)高讀寫(xiě)鎖仍然是一把鎖，有不同的狀態(tài)：讀寫(xiě)讀寫(xiě)鎖場(chǎng)景練習(xí)線程A加寫(xiě)鎖成功 線程B請(qǐng)求讀線程B線程A持有讀鎖 線程B請(qǐng)求寫(xiě)線程B線程A擁有讀鎖 線程B請(qǐng)求讀B加鎖 BCA釋放后，BB釋放后，C線程A持有寫(xiě)鎖 然后線程B請(qǐng)求讀鎖 然后程C請(qǐng)求BC阻A釋放，C加C釋放，B加constpthread_rwlockattr_t*restrictattr);pthread_rwlock_trwlock=銷毀讀intintintint條件變 條件變量不是所，要和互斥量-pthread_mutex_t*restrictmutex,structtimespec}

time_t longtv_nsec;/*nanosecondes*tv_sec絕對(duì)時(shí)間，填寫(xiě)的時(shí)候time(NULL)+600==>設(shè)置超時(shí)條件變量阻塞pthread_mutex_t*restrict先釋放鎖阻塞在cond條件變量上intpthread_cond_destroy(pthread_cond_t初始化一個(gè)條constpthread_condattr_t*restrictattr);intpthread_cond_broadcast(pthread_cond_t條件變量的作用：避免無(wú)必要內(nèi)容 創(chuàng)建線程回收線程線程退出pthread_exit殺死線程pthread_cancel線程分離pthread_detach,也可以通過(guò)屬性設(shè)置pthread_attr_setdetachstate設(shè)置屬性分離，之前需要查看線程IDpthread_self在進(jìn)程內(nèi)唯一 信號(hào)量是進(jìn)化版的互斥量，允許多個(gè)線程共享資intsem_init(sem_t*sem,intpshared,unsignedintsem定義的信號(hào)量0代表線程信非0代表進(jìn)程信value定義信號(hào)量的sem_destroy摧毀信號(hào)intsem_destroy(sem_t*sem);申請(qǐng)信號(hào)量，申請(qǐng)成功value--intsem_wait(sem_t*sem);釋放信號(hào)量value++intsem_post(sem_t分區(qū)linux-day09-線程同步的第9 實(shí)現(xiàn)常見(jiàn)兩個(gè)現(xiàn)象的死鎖，鎖了又鎖以及交叉實(shí)現(xiàn)哲學(xué)家分區(qū)linux-day09-線程同步的第10errno #defineEPERM 1/*Operationnotpermitted*/#defineENOENT 2/*Nosuchfileordirectory*/#defineESRCH 3/*Nosuchprocess*/#defineEINTR /*Interruptedsystemcall*/#defineEIO /*I/Oerror*/#defineENXIO /*Nosuchdeviceoraddress*/#defineE2BIG /*Argumentlisttoolong*/#defineENOEXEC /*Execformaterror*/#defineEBADF /*Badfilenumber*/#defineECHILD /*Nochildprocesses*/#defineEAGAIN /*Tryagain*/#defineENOMEM12/*Outofmemory*/#defineEACCES13/*Permissiondenied*/#defineEFAULT14/*Badaddress*/#defineENOTBLK15/*Blockdevicerequired*/#defineEBUSY 16/*Deviceorresourcebusy*/#defineEEXIST17/*Fileexists*/#defineEXDEV /*Cross-devicelink*/#defineENODEV /*Nosuchdevice*/#defineENOTDIR /*Notadirectory*/#defineEISDIR /*Isadirectory*/#defineEINVAL 22 /*Invalidargument*/#defineENFILE /*Filetableoverflow*/#defineEMFILE 24 /*Toomanyopenfiles*/#defineENOTTY /*Notatypewriter*/#defineETXTBSY /*Textfilebusy*/#defineEFBIG /*Filetoolarge*/#defineENOSPC /*Nospaceleftondevice*/#defineESPIPE /*Illegalseek*/#defineEROFS /*Read-onlyfilesystem*/#defineEMLINK /*Toomanylinks*/ /*Brokenpipe /*Mathargumentoutofof /*Mathresultnotrepresentable#defineEDEADLK /*Resourcedeadlockwouldoccur*/#defineENALONG /*Filenametoolong*/#defineENOLCK /*Norecordlocksavailable*/#defineENOSYS /*Invalidsystemcallnumber*/#defineENOTEMPTY /*Directorynotempty*/ /*Toomanysymboliclinks#defineEWOULDBLOCK EAGAIN/*Operationwouldblock*/#defineENOMSG /*Nomessageofdesiredtype*/#defineEIDRM /*Identifierremoved*/#defineECHRNG /*Channelnumberoutofrange*/#defineEL2NSYNC /*Level2notsynchronized*/#defineEL3HLT /*Level3halted*/ /*Level3reset#defineELNRNG /*Linknumberoutofrange*/#defineEUNATCH /*Protocoldrivernotattached*/#defineENOCSI /*NoCSIstructureavailable*/#defineEL2HLT /*Level2halted*/ /*Invalidexchange#defineEBADR 53 /*Invalidrequestdescriptor*/#defineEXFULL /*Exchangefull*/ /*Noanode#defineEBADRQC /*Invalidrequestcode*/#defineEBADSLT /*Invalidslot*/ #defineEBFONT /*Badfontfileformat*/#defineENOSTR /*Devicenotastream*/#defineENODATA /*Nodataavailable*/#defineETIME /*Timerexpired*/ /*Outofstreamsresources#defineENONET /*Machineisnotonthenetwork*/#defineENOPKG 65 /*Packagenotinstalled*/#defineEREMOTE /*Objectisremote*/#defineENOLINK /*Linkhasbeensevered*/#defineEADV /*Advertiseerror*/ /*Srmounterror#defineECOMM /*Communicationerroronsend*/#defineEPROTO /*Protocolerror*/#defineEMULTIHOP /*Multihopattempted*/#defineEDOTDOT /*RFSspecificerror*/#defineEBADMSG /*Notadatamessage*/#defineEOVERFLOW /*Valuetoolargefordefineddatatype*/#defineENOTUNIQ /*Namenotuniqueonnetwork*/#defineEBADFD /*Filedescriptorinbadstate*/#defineEREMCHG /*Remoteaddresschanged*/ /*Cannotaccessaneededshared#defineELIBBAD 80 /*Accessingacorruptedsharedlibrary*/ /*.libsectionina.outcorrupted*/#defineELIBMAX /*Attemptingtolinkintoomanysharedlibraries*/ /*Cannotexecasharedlibrary /*Illegalbytesequence#defineERESTART /*Interruptedsystemcallshouldberestarted*/#defineESTRPIPE /*Streamspipeerror*/#defineEUSERS /*Toomanyusers*/#defineENOTSOCK88/*Socketoperationonnon-socket*/#defineEDESTADDRREQ89/*Destinationaddressrequired*/#defineEMSGSIZE90/*Messagetoolong*/#defineEPROTOTYPE /*Protocolwrongtypeforsocket*/#defineENOPROTOOPT /*Protocolnotavailable*/#defineEPROTONOSUPPORT93 /*Protocolnotsupported*/#defineESOCKTNOSUPPORT94 /*Sockettypenotsupported*/#defineEOPNOTSUPP /*Operationnotsupportedontransportendpoint*/ /*Protocolfamilynotsupported#defineEAFNOSUPPORT /*Addressfamilynotsupportedbyprotocol*/ /*Addressalreadyinuse /*Cannotassignrequested /*Networkisdown#defineENETUNREACH101/*Networkisunreachable*/#defineENETRESET102/*Networkdroppedconnectionbecauseofreset*/#defineECONNABORTED103/*Softwarecausedconnectionabort*/#defineECONNRESET104/*Connectionresetbypeer#define/*Nobufferspaceavailable#define/*Transportendpointisconnected#defineENOTCONN /*Transportendpointisnotconnected*/#defineESHUTDOWN /*Cannotsendaftertransportendpointshutdown*/#defineETOOMANYREFS /*Toomanyreferences:cannotsplice*/#defineETIMEDOUT /*Connectiontimedout*/#defineECONNREFUSED /*Connectionrefused*/#defineEHOSTDOWN /*Hostisdown*/#defineEHOSTUNREACH /*Noroutetohost*