thread.c

关于thead线程的例子代码

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

void *foo(void *arg);

int main(int argc, char **argv)
{
  pthread_t tid;
  int err;

  //int pthread_create(pthread_t * restrict thread, const pthread_attr_t * restrict attr, void *(*start_routine) (void *), void *restrict arg);
  if ((err = pthread_create(&tid, NULL, foo, NULL)) != 0)
  {
    fprintf(stderr, "pthread_create() failed: %s\n", strerror(err));
    exit(1);
  }

  fprintf(stdout, "pthread_create() successed, tid = %p.\n", &tid);
  fprintf(stdout, "Main thread: pid = %d\n", getpid());

  fprintf(stdout, "Main thread: before pthread_join()\n");

  void *value;

  //int pthread_join(pthread_t thread, void **value_ptr);
  if ((err = pthread_join(tid, &value)) != 0)
  {
    fprintf(stderr, "pthread_join() failed: %s\n", strerror(err));
    exit(1);
  }

  fprintf(stdout, "Main thread: after pthread_join()\n");

  sleep(10);

  return 0;
}

void *foo(void *arg)
{
  fprintf(stdout, "No.1 thread: Just a test.\n");
  fprintf(stdout, "No.1 thread: pid = %d\n", getpid());

  int i;

  for (i = 0; i < 10; i++)
  {
    fprintf(stdout, ".");
    fflush(stdout);
    sleep(1);
  }

  //return NULL;
  pthread_exit(0);
}