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#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
static pthread_cond_t cond1;
static pthread_cond_t cond2;
static pthread_mutex_t test_lock = PTHREAD_MUTEX_INITIALIZER;
static void *
thread1_func(void* arg)
{
printf("Thread 1 (arg=%p tid=%d) entered.\n", arg, gettid());
printf("1 waiting for cond1\n");
pthread_mutex_lock(&test_lock);
pthread_cond_wait(&cond1, &test_lock );
pthread_mutex_unlock(&test_lock);
printf("Thread 1 done.\n");
return 0;
}
static void *
thread2_func(void* arg)
{
printf("Thread 2 (arg=%p tid=%d) entered.\n", arg, gettid());
printf("2 waiting for cond2\n");
pthread_mutex_lock(&test_lock);
pthread_cond_wait(&cond2, &test_lock );
pthread_mutex_unlock(&test_lock);
printf("Thread 2 done.\n");
return 0;
}
static void *
thread3_func(void* arg)
{
printf("Thread 3 (arg=%p tid=%d) entered.\n", arg, gettid());
printf("3 waiting for cond1\n");
pthread_mutex_lock(&test_lock);
pthread_cond_wait(&cond1, &test_lock );
pthread_mutex_unlock(&test_lock);
printf("3 Sleeping\n");
sleep(2);
printf("3 signal cond2\n");
pthread_cond_signal(&cond2);
printf("Thread 3 done.\n");
return 0;
}
static void *
thread4_func(void* arg)
{
printf("Thread 4 (arg=%p tid=%d) entered.\n", arg, gettid());
printf("4 Sleeping\n");
sleep(5);
printf("4 broadcast cond1\n");
pthread_cond_broadcast(&cond1);
printf("Thread 4 done.\n");
return 0;
}
int main(int argc, const char *argv[])
{
pthread_t t[4];
pthread_cond_init(&cond1, NULL);
pthread_cond_init(&cond2, NULL);
pthread_create( &t[0], NULL, thread1_func, (void *)1 );
pthread_create( &t[1], NULL, thread2_func, (void *)2 );
pthread_create( &t[2], NULL, thread3_func, (void *)3 );
pthread_create( &t[3], NULL, thread4_func, (void *)4 );
pthread_join(t[0], NULL);
pthread_join(t[1], NULL);
pthread_join(t[2], NULL);
pthread_join(t[3], NULL);
return 0;
}
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