fork1.forkall.c

Solaris下进程编程源码,sun公司培训用例

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>

void* thread_func(void*);
void print_thread();

int main(int argc, char** argv)
{
        pid_t child_pid1, child_pid2;
        pthread_t tid1, tid2;
    
        // Create two threads
        if (pthread_create(&tid1, NULL, thread_func, NULL) != 0 ||
            pthread_create(&tid2, NULL, thread_func, NULL) != 0) {
                printf("Can't create threads.\n");
                return -1;
        }
    
        // Create the child process 1 using fork1()
        if ((child_pid1 = fork1()) == -1){
                printf("Can't create child process 1\n");
                exit(-1);
        } else if (child_pid1 == 0) { // Child 1's code
                printf("Child %d is created by process %d using fork1\n",
                       getpid(), getppid());
                while (1) {
                        sleep(3);
                        print_thread();
                }
        } else { // Parent's code
                // Create the child process 2 using forkall()
                if (( child_pid2 = forkall()) == -1){
                        printf("Can't create child process 2\n");
                        exit(-1);
                } else if (child_pid2 == 0) { // Child 2's code
                        printf("Child %d is created by process %d using forkall\n",
                               getpid(), getppid());
                        while (1) {
                                sleep(3);
                                print_thread();
                        }
                } else { // Parent's code
                        while (1) {
                                sleep(2);
                                print_thread();
                        }
                }
        }
}

void* thread_func(void* arg)
{
        while (1) {
                sleep(3);
                print_thread();
        }
}

void print_thread()
{
        printf("Process %d: thread %d running\n", getpid(), pthread_self());  
}