当前位置：首页 > news >正文

linux——退出单一线程

news 2026/6/14 3:31:05

pthread_exit

exit(0)

函数原型： void pthread‐exit(void *retval)； retval指针：必须指向全局，堆

#include<stdio.h> #include<pthread.h> #include<unistd.h> #include<string.h> #include<stdlib.h> void* myfunc(void *arg) { printf("child pthread id:%ld\n",pthread_self()); for(int i=0;i<5;i++) { printf("child pthread %d\n",i); } return 0; } int main() { pthread_t pthid; int ret; ret = pthread_create(&pthid,NULL,myfunc,NULL); if(ret != 0) { printf("error number is %d\n",ret); printf("%s\n",strerror(ret)); } printf("parent pthread id:%ld\n",pthread_self()); pthread_exit(NULL); for(int i=0;i<5;i++) { printf("parent pthread %d\n",i); } sleep(2); return 0; }

在主线程里调用`pthread_exit(NULL)`

作用：只退出当前主线程，进程不会结束。
结果：主线程挂了，但进程里还有子线程活着，所以子线程继续跑。

#include<stdio.h> #include<pthread.h> #include<unistd.h> #include<string.h> #include<stdlib.h> void* myfunc(void *arg) { printf("child pthread id:%ld\n",pthread_self()); for(int i=0;i<5;i++) { printf("child pthread %d\n",i); if(i==2) { exit(0); } } return 0; } int main() { pthread_t pthid; int ret; ret = pthread_create(&pthid,NULL,myfunc,NULL); if(ret != 0) { printf("error number is %d\n",ret); printf("%s\n",strerror(ret)); } printf("parent pthread id:%ld\n",pthread_self()); for(int i=0;i<5;i++) { printf("parent pthread %d\n",i); } pthread_exit(NULL); sleep(2); return 0; }

这里子线程循环到2是，exit退出了整个进程

#include<stdio.h> #include<pthread.h> #include<unistd.h> #include<string.h> #include<stdlib.h> void* myfunc(void *arg) { printf("child pthread id:%ld\n",pthread_self()); for(int i=0;i<5;i++) { printf("child pthread %d\n",i); if(i==2) { exit(0); } } return 0; } int main() { pthread_t pthid; int ret; ret = pthread_create(&pthid,NULL,myfunc,NULL); if(ret != 0) { printf("error number is %d\n",ret); printf("%s\n",strerror(ret)); } printf("parent pthread id:%ld\n",pthread_self()); int i=0 while(1) { i++; printf("parent pthread %d\n",i); } pthread_exit(NULL); sleep(2); return 0; }

这段代码就证明了，exit退出了整个进程

#include<stdio.h> #include<pthread.h> #include<unistd.h> #include<string.h> #include<stdlib.h> void* myfunc(void *arg) { printf("child pthread id:%ld\n",pthread_self()); for(int i=0;i<5;i++) { printf("child pthread %d\n",i); if(i==2) { pthread_exit(NULL); } } return 0; } int main() { pthread_t pthid; int ret; ret = pthread_create(&pthid,NULL,myfunc,NULL); if(ret != 0) { printf("error number is %d\n",ret); printf("%s\n",strerror(ret)); } printf("parent pthread id:%ld\n",pthread_self()); int i=0 while(1) { i++; printf("parent pthread %d\n",i); } pthread_exit(NULL); sleep(2); return 0; }

将exit换成pthread_exit就可以只退出子线程，不退出主线程了

也可以将pthread_exit(NULL)换为return NULL，效果也是一样的

还可以在子线程里调用个函数

#include<stdio.h> #include<pthread.h> #include<unistd.h> #include<string.h> #include<stdlib.h> void* myreturn() { return NULL; } void* myfunc(void *arg) { printf("child pthread id:%ld\n",pthread_self()); for(int i=0;i<5;i++) { printf("child pthread %d\n",i); if(i==2) { myreturn(); } } return 0; } int main() { pthread_t pthid; int ret; ret = pthread_create(&pthid,NULL,myfunc,NULL); if(ret != 0) { printf("error number is %d\n",ret); printf("%s\n",strerror(ret)); } printf("parent pthread id:%ld\n",pthread_self()); int i=0 while(1) { i++; printf("parent pthread %d\n",i); } pthread_exit(NULL); sleep(2); return 0; }

效果也是一样的

查看全文

http://www.jsqmd.com/news/600163/