pthread
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函数
pthread_create 用来创建新的线程。使用它需要包含 pthread.h 文件。其第三个参数为返回值为 void* 的函数。
pthread_join 可以用来等待线程退出，否则主线程退出时整个程序会退出。
示例
一
我写的测试程序：
//=====================================================================
// 多线程测试
//=====================================================================
#include<stdio.h>
#include<unistd.h>
#include<pthread.h>
//---------------------------------------------------------------------
void* thread2(){
while(1){
printf("Hello from thread2!\n");
sleep(3);
}
}
int main(){
pthread_t pid;
pthread_create(&pid, NULL, thread2, NULL);
printf("Hello from main()!\n");
sleep(9);
return 0;
}
//=====================================================================
二
linux c/c++多线程程序的编写 中的示例程序（有少许更改）：
#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<pthread.h>
#include<string.h>
void *thread_function(void* arg);
char message[] = "Hello world!";
int main() {
int res;
pthread_t a_thread;
void *thread_result;
res = pthread_create(&a_thread, NULL, thread_function, (void*)message);
if (0 != res) {
perror("Thread creation faied");
exit(EXIT_FAILURE);
}
printf("Waiting for thread to finish...\n");
res = pthread_join(a_thread, &thread_result);
if (0 != res) {
perror("Thread join failed");
exit(EXIT_FAILURE);
}
printf("Thread joined, it returned %s\n", (char*)thread_result);
printf("Message is now %s\n",message);
exit(EXIT_SUCCESS);
}
void *thread_function(void* arg) {
printf("thread_function is running. argument was %s\n",(char*)arg);
sleep(3);
strcpy(message,"bye!");
pthread_exit("Thank you for the cpu time");
}
编译
编译命令：
gcc -o mthread mthread.c -lpthread