Linux-Pthread代碼解析-生產(chǎn)者消費(fèi)者

新鄉(xiāng)學(xué)院計(jì)算機(jī)與信息工程學(xué)院實(shí)驗(yàn)報(bào)告課程名稱操作系統(tǒng)原理專業(yè)計(jì)算機(jī)科學(xué)與技術(shù)班級3班學(xué)號2013052701xx姓名xxx實(shí)驗(yàn)成績?nèi)握n教師xxx2013年12月3日實(shí)驗(yàn)名稱姓名Pthread代碼解析---生產(chǎn)者消費(fèi)者xxx成績實(shí)驗(yàn)地點(diǎn)A14-322實(shí)驗(yàn)時(shí)間2013年12月10日一、實(shí)驗(yàn)?zāi)康呐c要求實(shí)驗(yàn)?zāi)康模哼M(jìn)一步熟悉linux中Pthread代碼解析---生產(chǎn)者消費(fèi)者實(shí)驗(yàn)要求：認(rèn)真二、操作步驟1、編寫producer_consumer.c文件代碼，代碼如下：#include<stdio.h>#include<pthread.h>#include<semaphore.h>#include<unistd.h>#include<stdlib.h>#include<time.h>//線程//因?yàn)橛玫搅藄em_init等intbuffer[10]={0,0,0,0,0,0,0,0,0,0};inti=0;intj=0;//信號量的數(shù)據(jù)類型為結(jié)構(gòu)sem_t，它本質(zhì)上是一個(gè)長整型的數(shù)sem_tfull;//信號量sem_tempty;pthread_mutex_tmutex;//pthread_mutex_t是一個(gè)結(jié)構(gòu),是互斥鎖voidproducer(void){intm;while(i<10){pthread_mutex_lock(&mutex);//聲明開始用互斥鎖上鎖buffer[i]=i+1;i=i+1;printf("\nthereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9\n");printf("\nbuffer:");for(m=0;m<10;m++)printf("%3d",buffer[m]);printf("\nthenumberaddedbytheproduceris:");printf("%d",buffer[i]);printf("\npointeris%d",i);sem_post(&full);//intsem_post(sem_t*sem);------sem_post函數(shù)的作用是給信號量的值加上一個(gè)“1”，它是一個(gè)“原子操作"即同時(shí)對同一個(gè)信號量做加“1”操作的兩個(gè)線程是不會(huì)沖突的pthread_mutex_unlock(&mutex);//聲明開始用互斥鎖解鎖}}voidconsumer(void){intm;while(j<10){intx;pthread_mutex_lock(&mutex);sem_wait(&full);//sem_wait函數(shù)也是一個(gè)原子操作，它的作用是從信號量的值減去一個(gè)“1”，但它永遠(yuǎn)會(huì)先等待該信號量為一個(gè)非零值才開始做減法。if(buffer[j]==0)break;x=buffer[j];buffer[j]=0;j=j+1;printf("\nbuffer:");for(m=0;m<10;m++)printf("%3d",buffer[m]);printf("\n%disremovedformthebufferbyconsumer",x);printf("\nThepresentpointeris%d",j);pthread_mutex_unlock(&mutex);sem_post(&empty);}}intmain(){pthread_tthread1,thread2,thread3,thread4;sem_init(&full,0,0);//intsem_init(sem_t*sem,intpshared,unsignedintvalue)---------sem_init()化一個(gè)定位在sem的匿名信號量。value參數(shù)。pshared參數(shù)指明信號量是由進(jìn)程內(nèi)線程共享，由進(jìn)程之間共享。如果pshared的值為0，那么信號量將被進(jìn)程內(nèi)的線程放置在所有線程都可見的地址上初始指定信號量的初始值還是共享，并且應(yīng)該sem_init(&empty,0,10);pthread_create(&thread1,NULL,(void*)producer,NULL);//函數(shù)pthread_create用來創(chuàng)建一個(gè)線程pthread_create(&thread2,NULL,(void*)consumer,NULL);//函數(shù)pthread_join用來等待一個(gè)線程的結(jié)束pthread_join(thread1,NULL);pthread_join(thread2,NULL);}2、執(zhí)行g(shù)cc命令如下：[root@bogon桌面]#gcc-oproducer_consumer.outproducer_consumer.c-lpthread三、實(shí)驗(yàn)結(jié)果1：在終端輸入gcc-oproducer_consumer.outproducer_consumer.c-lpthread命令之后，運(yùn)行./producer_consumer.out結(jié)果如下：[root@bogon桌面]#gcc-oproducer_consumer.outproducer_consumer.c-lpthread[root@bogon桌面]#./producer_consumer.outthereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1000000000thenumberaddedbytheproduceris:0pointeris1thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1200000000thenumberaddedbytheproduceris:0pointeris2thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1230000000thenumberaddedbytheproduceris:0pointeris3thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1234000000thenumberaddedbytheproduceris:0pointeris4thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1234500000thenumberaddedbytheproduceris:0pointeris5thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1234560000thenumberaddedbytheproduceris:0pointeris6thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1234567000thenumberaddedbytheproduceris:0pointeris7thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1234567800thenumberaddedbytheproduceris:0pointeris8thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:1234567890thenumberaddedbytheproduceris:0pointeris9thereare10blocksinthebuffer:0,1,2,3,4,5,6,7,8,9buffer:12345678910thenumberaddedbytheproduceris:10pointeris10buffer:023456789101isremovedformthebufferbyconsumerThepresentpointeris1buffer:003456789102isremovedformthebufferbyconsumerThepresentpointeris2buffer:000456789103isremovedformthebufferbyconsumerThepresentpointeris3buffer:000056789104isremovedformthebufferbyconsumerThepresentpointeris4buffer:000006789105isremovedformthebufferbyconsumerThepresentpointeris5buffer:000000789106isremovedformthebufferbyconsumerThepresentpointeris6buffer:000000089107isremovedformthebufferbyconsumerThepresentpointeris7buffer:000000009108isremovedformthebufferbyco