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 enter\n"); while(1) { printf("%s\n", __FUNCTION__); usleep(1000 * 1000); } printf("fun1 exit\n"); return ((void *)1);}void *fun2(void *arg){ printf("fun1 enter\n"); usleep(1000 * 3000); char * ptr = (char *)malloc(sizeof(char)); printf("ptr1: 0x%x\n", ptr); ptr = NULL; printf("ptr2: 0x%x\n", ptr); free(ptr); memcpy(ptr, "123", 3); printf("ptr3: 0x%x\n", ptr); printf("fun2 exit\n"); 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 enter\n"); usleep(1000 * 3000); char * ptr = (char *)malloc(sizeof(char)); printf("ptr1: 0x%x\n", ptr); ptr = NULL; printf("ptr2: 0x%x\n", ptr); free(ptr); memcpy(ptr, "123", 3); printf("ptr3: 0x%x\n", ptr); printf("fun2 exit\n"); 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 %lu\n", (unsigned long)getpid()); fun(NULL); exit(0); } } printf("parent pid is %lu\n", (unsigned long)getpid()); while(-1 != wait(NULL)); //等待所有子进程结束 printf("main return\n"); getchar(); return 0;}

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