多线程并行与退出

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例1：进程与线程并行输出

#include <stdio.h>#include <string.h>#include <errno.h>#include <pthread.h>//线程函数入口void *thread_routine(void *arg){printf("I am a thread, my thread id is : %d\n", pthread_self());        int i;for ( i = 0; i < 5; i++){printf("thread i = %d\n", i);fflush(stdout); //冲洗缓冲区，避免影响进程sleep(1);}printf("I am a thread, I will exit\n");}int main(){pthread_t tid;int ret = 0;ret = pthread_create(&tid, NULL, thread_routine, NULL); //创建一个线程if (ret != 0){printf("pthread_create error\n");exit(0);}        int i;for ( i = 0; i < 5; i++){printf("main i = %d\n", i);fflush(stdout); //冲洗缓冲区，避免影响线程sleep(1);}sleep(2); //等待线程退出，如果线程还在执行，但是进程退出，那么线程也会退出printf("parent exit\n");exit(0);}

例2：等待线程与线程退出函数

#include <stdio.h>#include <string.h>#include <errno.h>#include <pthread.h>//线程函数入口void *thread_routine(void *arg){printf("I am a thread, my thread id is : %d\n", pthread_self());int i;for (i = 0; i < 5; i++){printf("thread i = %d\n", i);fflush(stdout); //冲洗缓冲区，避免影响进程sleep(1);}sleep(3);printf("child exit\n");pthread_exit(NULL);//线程结束函数}int main(){pthread_t tid;int ret = 0;ret = pthread_create(&tid, NULL, thread_routine, NULL); //创建一个线程if (ret != 0){printf("pthread_create error\n");exit(0);}int i;for (i = 0; i < 5; i++){printf("main i = %d\n", i);fflush(stdout); //冲洗缓冲区，避免影响线程sleep(1);}pthread_join(tid, NULL);//等待线程退出printf("parent exit\n");exit(0);}

例3：创建多个线程，并向线程传递数据

#include <stdio.h>#include <string.h>#include <stdlib.h>#include <errno.h>#include <pthread.h>typedef struct Threadinfo{char name[64];int age;int numId;}ThreadInfo;int nNum, nLoop;void *thread_routine(void *arg){int i = 0;ThreadInfo * p = (ThreadInfo*)arg;for (i = 0; i < nLoop; ++i){printf("thread id is : %d, numid is %d\n", pthread_self(), i, p->numId);}printf("child exit: %d\n", pthread_self());pthread_exit(arg);}int main(){int i = 0;pthread_t tidArray[200];ThreadInfo tmp[200];printf("Input the number of thread:");scanf("%d", &nNum);printf("Input the number of nLoop:");scanf("%d", &nLoop);int ret = 0;for (i = 0; i < nNum; ++i){memset(&tmp[i], 0, sizeof(ThreadInfo));tmp[i].numId = i;pthread_create(&tidArray[i], NULL, thread_routine, &tmp[i]);}for (i = 0; i < nNum; ++i){pthread_join(tidArray[i], NULL);}printf("parent exit\n");exit(0);}

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