第18章___線程同步互斥與進(jìn)程間通信

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1、同步對(duì)象互斥量事件臨界區(qū)信號(hào)量MFC對(duì)同步對(duì)象的支持互斥的引入（錯(cuò)誤例子）#include#includeHANDLEthread1;HANDLEthread2;inttickets=100;DWORDWINAPIThread1Proc(LPVOIDlparam);DWORDWINAPIThread2Proc(LPVOIDlparam);voidmain(){thread1=CreateThread(NULL,0,Thread1Proc,NULL,0,NULL);t

2、hread2=CreateThread(NULL,0,Thread2Proc,NULL,0,NULL);Sleep(40000);CloseHandle(thread1);CloseHandle(thread2);}DWORDWINAPIThread1Proc(LPVOIDlparam){intt;while(tickets>0){t=tickets;Sleep(100);cout<<"Thread1sell:"<

3、Proc(LPVOIDlparam){intt;while(tickets>0){t=tickets;Sleep(100);cout<<"Thread2sell:"<

4、utexAttributes,//繼承屬性，可以為空BOOLbInitialOwner,//創(chuàng)建后是否立即擁有訪問權(quán)LPCTSTRlpName);//互斥對(duì)象的名字，為NULL則為匿名互斥對(duì)象功能：創(chuàng)建一個(gè)命名或匿名的互斥對(duì)象，返回句柄函數(shù)返回值：如對(duì)象已存在，則返回原來存在的對(duì)象句柄，創(chuàng)建成功返回新句柄，創(chuàng)建失敗返回NULL互斥對(duì)象相關(guān)函數(shù)DWORDWaitForSingleObject(HANDLEhHandle,//互斥對(duì)象句柄DWORDdwMilliseconds);//等待時(shí)間功能：等待獲取互斥對(duì)象的

5、訪問權(quán)，未獲取之前會(huì)一直等待，或用完dwMilliseconds為止，dwMilliseconds可以為0-INFINITE一旦一個(gè)線程獲取了訪問權(quán)，函數(shù)會(huì)把互斥對(duì)象置為不可用狀態(tài)函數(shù)返回值為：WAIT_OBJECT_0獲得擁有權(quán)，WAIT_TIMEOUT等待超長(zhǎng)，WAIT_ABANDONED前擁有者異常終止互斥對(duì)象相關(guān)函數(shù)DWORDWaitForMultipleObjects(DWORDnCount,//數(shù)組中句柄個(gè)數(shù)constHANDLE*lpHandles,//對(duì)象句柄數(shù)組BOOLbWaitAll,//是

6、否等待全部DWORDdwMilliseconds);互斥對(duì)象相關(guān)函數(shù)BOOLReleaseMutex(HANDLEhMutex);功能：釋放對(duì)互斥對(duì)象的訪問權(quán)，使互斥對(duì)象處于有信號(hào)（可用）狀態(tài)使用互斥量后的程序#include#includeHANDLEthread1;HANDLEthread2;inttickets=100;DWORDWINAPIThread1Proc(LPVOIDlparam);DWORDWINAPIThread2Proc(LPVOIDlpara

7、m);HANDLEhMutex;voidmain(){thread1=CreateThread(NULL,0,Thread1Proc,NULL,0,NULL);thread2=CreateThread(NULL,0,Thread2Proc,NULL,0,NULL);hMutex=CreateMutex(NULL,false,NULL);while(tickets>0)Sleep(1000);CloseHandle(thread1);CloseHandle(thread2);}DWORDWINAPIThread1

8、Proc(LPVOIDlparam){intt;while(tickets>0){WaitForSingleObject(hMutex,INFINITE);t=tickets;Sleep(100);if(t>0)cout<<"Thread1sell:"<