浅谈linux模拟多线程崩溃和多进程崩溃

结论是：多线程下如果其中一个线程崩溃了会导致其他线程（整个进程）都崩溃；多进程下如果其中一个进程崩溃了对其余进程没有影响；

多线程

#include <stdio.h>#include <string.h>#include <stdlib.h>#include <pthread.h>#include <assert.h>void *fun1(void *arg){ printf('fun1 entern'); while(1) { printf('%sn', __FUNCTION__); usleep(1000 * 1000); } printf('fun1 exitn'); return ((void *)1);}void *fun2(void *arg){ printf('fun1 entern'); usleep(1000 * 3000); char * ptr = (char *)malloc(sizeof(char)); printf('ptr1: 0x%xn', ptr); ptr = NULL; printf('ptr2: 0x%xn', ptr); free(ptr); memcpy(ptr, '123', 3); printf('ptr3: 0x%xn', ptr); printf('fun2 exitn'); return ((void *)2);}int main(void){ pthread_t tid1, tid2; int err; err = pthread_create(&tid1, NULL, fun1, NULL); assert(0 == err); err = pthread_create(&tid2, NULL, fun2, NULL); assert(0 == err); printf('main join ...n');// getchar(); pthread_join(tid1, NULL); pthread_join(tid2, NULL); return 0;}

多进程

#include <stdio.h>#include <string.h>#include <stdlib.h>#include <pthread.h>#include <assert.h>void fun(void *arg){ printf('fun1 entern'); usleep(1000 * 3000); char * ptr = (char *)malloc(sizeof(char)); printf('ptr1: 0x%xn', ptr); ptr = NULL; printf('ptr2: 0x%xn', ptr); free(ptr); memcpy(ptr, '123', 3); printf('ptr3: 0x%xn', ptr); printf('fun2 exitn'); return ;}int main(int argc, char *argv[]){ assert(2 == argc); pid_t pid; int i; for(i=0; i<atoi(argv[1]); i++) { pid = fork(); if(0 > pid) { printf('fork error'); exit(1); } else if(0 == pid) { printf('child pid is %lun', (unsigned long)getpid()); fun(NULL); exit(0); } } printf('parent pid is %lun', (unsigned long)getpid()); while(-1 != wait(NULL)); //等待所有子进程结束 printf('main returnn'); getchar(); return 0;}

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