#include
#include
#include
#include
#include
#include
#include
void *thread_function(void *arg);
int run_now = 1;
pthread_mutex_t work_mutex;
int main()
{
int res;
int print_count1 = 0;
pthread_t a_thread;
if(pthread_mutex_init(&work_mutex,NULL) != 0)
{
perror("Mutex init failed");
exit(1);
}
if(pthread_mutex_lock(&work_mutex) !=0)
{
perror("Lock failed");
exit(1);
}
else
printf("main lock\n");
while(print_count1++<5)
{
if(run_now == 1)
{
printf("main thread is run\n");
run_now = 2;
}
else
{
printf("main thread is sleep\n");
sleep(1);
}
}
if(pthread_mutex_unlock(&work_mutex) !=0)
{
perror("unlock failed");
exit(1);
}
else
printf("main unlock\n");
pthread_mutex_destory(&work_mutex);
pthread_join(a_thread,NULL);
exit(0);
}
void *thread_function(void *arg)
{
int print_count2 = 0;
sleep(1);
if(pthread_mutex_lock(&work_mutex) != 0)
{
perror("Lock failed");
exit(1);
}
else
printf("function lock\n");
while(print_count2++<5)
{
if(run_now == 2)
{
printf("function thread is run\n");
run_now = 1;
}
else
{
printf("function thread is sleep\n");
sleep(1);
}
}
if(pthread_mutex_unlock(&work_mutex) != 0)
{
perror("unlock failed");
exit(1);
}
else
printf("function unlock\n");
pthread_exit(NULL);
}
