tc002_01_sem.c.svn-base

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * File      : tc001_thread.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-05-28     Bernard      the first version
 */

#include <rtthread.h>

char thread1_stack[512];
char thread2_stack[512];

struct rt_thread thread1;
struct rt_thread thread2;

struct rt_semaphore sem;

void thread1_entry(void* parameter)
{
	while (1)
	{
		if (rt_sem_take(&sem, RT_WAITING_FOREVER) == RT_EOK)
		{
			rt_kprintf("thread1:taken semaphore\n");

			rt_thread_delay(50);
			rt_sem_release(&sem);
		}
	}
}

void thread2_entry(void* parameter)
{
	while (1)
	{
		if (rt_sem_take(&sem, RT_WAITING_FOREVER) == RT_EOK)
		{
			rt_kprintf("thread2:taken semaphore\n");

			rt_thread_delay(10);
			rt_sem_release(&sem);
		}

		if (rt_sem_take(&sem, RT_WAITING_NO) == RT_EOK)
		{
			rt_kprintf("thread2:taken semaphore ok with no waiting\n");

			rt_thread_delay(10);
			rt_sem_release(&sem);
		}
		else
		{
			rt_kprintf("thread2: take semaphore failed with no waiting\n");
		}
	}
}

int rt_application_init()
{
	rt_sem_init(&sem, "semt", 1, RT_IPC_FLAG_FIFO);

	rt_thread_init(&thread1,
		"thread1",
		thread1_entry, RT_NULL,
		&thread1_stack[0], sizeof(thread1_stack),
		200, 100);

	rt_thread_init(&thread2,
		"thread2",
		thread2_entry, RT_NULL,
		&thread2_stack[0], sizeof(thread2_stack),
		250, 75);

	rt_thread_startup(&thread1);
	rt_thread_startup(&thread2);

	return 0;
}