Linux_OS_Sem_No.cpp

/*
 * @Author: xuezaigds@gmail.com
 * @Last Modified time: 2016-09-01 09:38:07
 */

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

int main(int argc, char *argv[])
{
    char message = 'X';
    int i = 0;
    if(argc > 1)
        message = argv[1][0];
    for(i = 0; i < 3; ++i)
    {
        printf("%c", message);
        fflush(stdout);
        sleep(rand() % 3);
        printf("%c", message);
        fflush(stdout);
        sleep(rand() % 2);
    }
    sleep(10);
    printf("\n%d - finished\n", getpid());
    exit(EXIT_SUCCESS);
}