如何从C中的多线程程序编写多进程程序

Question

我有两个线程的多线程程序，我想将它转换为多进程程序，以便两个线程成为两个进程，它告诉哪个进程首先完成

这是mutlithreaded程序：

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define OUTPUTNAME "write.out"
#define OUTPUTNAME1 "fprint.out"

void *syscall_writer_function();
void *stdlibrary_writer_function();
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mutex2 = PTHREAD_MUTEX_INITIALIZER;
int counter = 0;

main()
{
    int rc1, rc2;
    pthread_t thread1, thread2;

    /* Create independent threads each of which will execute functions */

    if( (rc1=pthread_create( &thread1, NULL, &syscall_writer_function, NULL)) )

    {
        printf("Thread creation failed: %d\n", rc1);
    }

    if( (rc2=pthread_create( &thread2, NULL, &stdlibrary_writer_function, NULL)) )
    {
        printf("Thread creation failed: %d\n", rc2);
    }

    pthread_join( thread1, NULL);
    pthread_join( thread2, NULL);

    exit(EXIT_SUCCESS);
}

void *syscall_writer_function()
{
    long i;
    int fd;
    if ((fd=open(OUTPUTNAME,O_WRONLY|O_CREAT,0644)) < 0){
        fprintf(stderr,"Can't open %s. Bye.\n",OUTPUTNAME);
        exit(1);
    }
    for (i=0; i<50000; i++) { /* write 50,000 Ys with write */
        if (write(fd,"Y",1) < 1) {
            fprintf(stderr,"Can't write. Bye\n");
            exit(1);
        }
    }
    pthread_mutex_lock( &mutex2 );
    counter++;
    printf("Syscall finished\n");
    printf("Counter value: %d\n",counter);
    close(fd);

    pthread_mutex_unlock( &mutex2 );
}

void *stdlibrary_writer_function()
{
    long i;
    FILE *fp;
    if ((fp=fopen(OUTPUTNAME1,"w")) == NULL) {
        fprintf(stderr,"Can't open %s. Bye.\n",OUTPUTNAME1);
        exit(1);
    }
    for (i=0; i<400000; i++) { /* write 400,000 Xs with fprintf */
        if (fprintf(fp,"X") < 1) {
            fprintf(stderr,"Can't write. Bye\n");
            exit(1);
        }
    }

    counter++;
    printf("Stdlibrary finished\n");
    printf("Counter value: %d\n",counter);
    fclose(fp);
}

如何将其转换为C？

中的多进程程序