操作系統(tǒng)原理實驗報告05

學(xué)號姓名專業(yè)、班實驗地點指導(dǎo)教師實驗時間實驗序號：5操作系統(tǒng)原理》實驗報告實驗項目名稱：線程的同步一、實驗?zāi)康募耙筮M一步掌握Windows系統(tǒng)環(huán)境下線程的創(chuàng)建與撤銷。熟悉Windows系統(tǒng)提供的線程同步API。使用Windows系統(tǒng)提供的線程同步API解決實際問題。二、實驗設(shè)備(環(huán)境)及要求Windows操作系統(tǒng)與VisualC++開發(fā)環(huán)境三、實驗內(nèi)容與步驟完成主、子兩個線程之間的同步，要求子線程先執(zhí)行。在主線程中使用系統(tǒng)調(diào)用CreateThread()創(chuàng)建一個子線程。主線程創(chuàng)建子線程后進入阻塞狀態(tài)，直到子線程運行完畢后喚醒主線程。<參考程序>#include"stdafx.h"#includevstdio?h>#includevwindows.h>staticHANDLEhi;〃線程句柄staticHANDLEhHandle1=NULL;〃信號量句柄voidfunc();intmain(intargc,char*argv[]){intnRetCode=0;DWORDdwThreadID1;DWORDdRes,err;hHandlel=代碼1〃創(chuàng)建一個信號量if(hHandle1==NULL)printf("SemaphoreCreateFail!\n");elseprintf("SemaphoreCreateSuccess!\n");hHandlel=代碼2〃打開信號量if(hHandle1==NULL)printf("SemaphoreOpenFail!\n");elseprintf("SemaphoreOpenSuccess!\n");h1=CreateThread((LPSECURITY_ATTRIBUTES)NULL,0,(LPTHREAD_START_ROUTINE)func,(LPVOID)NULL,0,&dwThreadID1);〃創(chuàng)建子線程if(h1==NULL)printf("Thread1createFail!\n");elseprintf("Thread1createSuccess!\n");dRes=代碼3〃主線程等待子線程結(jié)束err=GetLastError();printf("WaitForSingleObjecterr=%d\n",err);if(dRes==WAIT_TIMEOUT)printf("TIMEOUT!dRes=%d\n",dRes);elseif(dRes==WAIT_OBJECT_0)printf("WAIT_OBJECT!dRes=%d\n",dRes);elseif(dRes==WAIT_ABANDONED)printf("WAIT_ABANDONED!dRes=%d\n",dRes);elseprintf("dRes=%d\n",dRes);CloseHandle(h1);CloseHandle(hHandle1);ExitThread(0);returnnRetCode;

voidfunc(){BOOLrc;DWORDerr;printf("NowInThread!\n");rc=代碼4〃子線程喚醒主線程err=GetLastError();printf("ReleaseSemaphoreerr=%d\n",err);if(rc==0)printf("SemaphoreReleaseFail!\n");elseprintf("SemaphoreReleaseSuccess!rc=%d\n",rc);}以上程序完成了主、子兩個線程執(zhí)行先后順序的同步關(guān)系，填充代碼并思考以下問題：如何實現(xiàn)多個線程的同步？若允許子線程執(zhí)行多次后主線程再執(zhí)行，又如何設(shè)置信號量的初值。四、實驗結(jié)果與數(shù)據(jù)處理dwukdawlnreaaiDi;DWORDdRes,err;c「*C:\vc\t2\Debug\1.exe*SemaphoreCreateSuccess*SemaphoreOpenSuccess*ThreadlcreateSuccess*NowInThread*ReleaseSemaphoreerr=6SemaphoreReleaseFail*WaitForSingleObjecterr=0WAIT_OBJEGT?dRes=0c「*C:\vc\t2\Debug\1.exe*SemaphoreCreateSuccess*SemaphoreOpenSuccess*ThreadlcreateSuccess*NowInThread*ReleaseSemaphoreerr=6SemaphoreReleaseFail*WaitForSingleObjecterr=0WAIT_OBJEGT?dRes=0Pressanykeytocontinue,elseprintf("SemaphoreCreateSuccess?\n");hHandlel=OpenSemaphore(SEMAPHORE_MODIFV_STATE,if(hHandle1==NULL)printf("SemaphoreOpenFaielseprintf("SemaphoreOpenSuccess?\n");h1=CreateThread((LPSECURITY_ATTRIBUTES)NULL,0,(LPTHREADSTARTROUTINE)Func,(LPUOID)NULL,—0,&dwThreadID1);iF(h1==NULL)printF("Thread1createFail?\n");elseprintF("Thread1createSuccess?\n");dRes=WaitForSingle0bject(h1,100000);err=GetLastError();printF("WaitForSingleObjecterr=^d\n",err);if(dRes==WAITTIMEOUT)printF("TIMEOUT?dReelseif(dRes==WAIT_OBJECT_O)printF("WfiIT_OBJEe