创建多线程做减法(简化1）
坑爹的师父，坑爹的代码……粗略的精简了一下，但是线程的创建还是有点问题，下一版再研究以下是代码：
#include <pthread.h>#include <stdio.h>#include <stdlib.h>#define SIZE 5int sum;static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;void * thread(void *);int main(int argc, char *argv[]){ pthread_t tid; int i, rc = {0, 0, 0, 0, 0}; printf("enter main\n"); printf("Please input a number : \n"); scanf("%d", &sum); while (sum >= 0) {for (i = 0; i < SIZE; i++){ rc = pthread_create(&tid, NULL, thread, &i); if (rc != 0) printf("The thread%d-create is failed!\n", i); } } pthread_cond_wait(&cond, &mutex); printf("leave main\n"); exit(0);}void * thread(void *arg){ int * nArg = (int *)arg; printf("enter thread%d\n", *nArg); pthread_mutex_lock(&mutex); if (sum <= 0)exit(0); elseprintf("This is thread%d, sum : %d, thread id is %u\n", *nArg, sum, (unsigned int)pthread_self()); pthread_cond_signal(&cond); sum -= (*nArg); printf("This is thread%d, sum : %d, thread id is %u\n", *nArg, sum, (unsigned int)pthread_self()); pthread_mutex_unlock(&mutex); printf("leave thread%d\n", *nArg); pthread_exit(0);}
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