我试图分叉多线程应用程序.似乎fork没有复制我的第二个帖子.
这是我的代码：
#include <stdlib.h> #include <pthread.h> #include <iostream> #include <linux/unistd.h> #include <iostream> #include <sys/types.h> #include <sys/wait.h> #include <signal.h> #include <stdio.h> #include <unistd.h> #include <string> #include <unistd.h> #include <stdlib.h> #include <sys/ioctl.h> using namespace std; void Loop(const char* zThread) { while (true) { sleep(2); cout << "LOOP : " << zThread << " : " << getpid() << endl; } } void *MyFunction(void *pData) { Loop("Second"); }; int main() { pthread_t thread1; pthread_create(&thread1,NULL,MyFunction,NULL); int iPID = fork(); if (iPID == 0) cout << "Child : " << getpid() << endl; else cout << "Parent : " << getpid() << endl; Loop("First"); return EXIT_SUCCESS; };
它提供以下输出,该输出不包含子进程的第二个线程写入的任何信息.
test_1/ss> ./a.out Parent : 11877 Child : 11879 LOOP : Second : 11877 LOOP : First : 11877 LOOP : First : 11879 LOOP : Second : 11877 LOOP : First : 11877 LOOP : First : 11879 LOOP : Second : 11877 LOOP : First : 11877 LOOP : First : 11879 LOOP : Second : 11877 LOOP : First : 11877 LOOP : First : 11879 LOOP : Second : 11877 LOOP : First : 11877 LOOP : First : 11879 LOOP : Second : 11877 LOOP : First : 11877 LOOP : First : 11879
第二个帖子怎么了？
解决方法
只分叉调用线程.
从docs：
A process shall be created with a single thread. If a multi-threaded process calls fork(),the new process shall contain a replica of the calling thread and its entire address space,possibly including the states of mutexes and other resources. Consequently,to avoid errors,the child process may only execute async-signal-safe operations until such time as one of the exec functions is called.
