linux条件锁
父线程里：
  pthread_mutex_lock(&s_startupMutex);
  pthread_attr_t attr;
  pthread_attr_init (&attr);
  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 
  printf("server_create_child_thread\n"); 
  err = pthread_create(child_thread_value,&attr,child_thread,(void *)&peer );

  while (child_thread_start == 0) {
    printf("child_thread_start=0\n");
    pthread_cond_wait(&s_startupCond, &s_startupMutex);
  }
  child_thread_start=0;
  pthread_mutex_unlock(&s_startupMutex);

子线程里：
  pthread_mutex_lock(&s_startupMutex);
  sock_number = *(int *)sock_file_num;
  child_thread_start = 1;
  printf("broadcast\n");
  pthread_cond_broadcast(&s_startupCond);
  pthread_mutex_unlock(&s_startupMutex);
这里子线程明明广播了条件信号，为什么父线程还是一直阻塞等待呢，像是完全没有被唤醒
------解决方案--------------------
试了一下，能够唤醒阿，以下是根据楼主代码写的程序

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <pthread.h>



pthread_cond_t s_startupCond;

pthread_mutex_t s_startupMutex;

int child_thread_start=0;



void *child_thread()

{

	pthread_mutex_lock(&s_startupMutex);

	child_thread_start = 1;

	printf("broadcast\n");

	pthread_cond_broadcast(&s_startupCond);

	pthread_mutex_unlock(&s_startupMutex);

}



int main()

{

	pthread_t child_thread_value;

	pthread_mutex_lock(&s_startupMutex);

	pthread_attr_t attr;

	pthread_attr_init (&attr);

	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);



	printf("server_create_child_thread\n"); 

	int err = pthread_create(&child_thread_value,&attr,child_thread,(void *)NULL);



	while (child_thread_start == 0) {

		printf("child_thread_start=0\n");

		pthread_cond_wait(&s_startupCond, &s_startupMutex);

	}

        printf("pthread_cond_wait return and child_thread_start == 1\n");

	child_thread_start=0;

	pthread_mutex_unlock(&s_startupMutex);



    return 0;

}

以下是编译命令

gcc -o test test.c  -lpthread

以下是结果

server_create_child_thread

child_thread_start=0

broadcast

pthread_cond_wait return and child_thread_start == 1