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#include <pthread.h>
#include <semaphore.h>
#include <stdio.h>
static sem_t sema;
static void* other_thread()
{
printf("other_thread here!\n");
sleep(1);
while (1)
{
printf("other_thread: sem_post...\n");
if(sem_post(&sema) == -1)
printf("sem_post failed\n");
sleep(1);
}
printf("other_thread dies!\n");
pthread_exit(0);
}
static void test_thread(void* parameter)
{
pthread_t tid;
printf("main thread here!\n");
printf("sleep 5 seconds...");
sleep(5);
printf("done\n");
sem_init(&sema, 0, 0);
/* create the "other" thread */
if(pthread_create(&tid, 0, &other_thread, 0)!=0)
/* error */
printf("pthread_create OtherThread failed.\n");
else
printf("created OtherThread=%x\n", tid);
/* let the other thread run */
while (1)
{
printf("Main: sem_wait...\n");
if(sem_wait(&sema) == -1)
printf("sem_wait failed\n");
printf("Main back.\n\n");
}
pthread_exit(0);
}
#include <finsh.h>
void libc_sem()
{
rt_thread_t tid;
tid = rt_thread_create("semtest", test_thread, RT_NULL,
2048, 20, 5);
if (tid != RT_NULL)
{
rt_thread_startup(tid);
}
}
FINSH_FUNCTION_EXPORT(libc_sem, posix semaphore test);
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