2012-04-23 06:02:28 +00:00
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/**
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* Complete implementation in Device Drivers
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <rtdevice.h>
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#define RT_COMPLETED 1
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#define RT_UNCOMPLETED 0
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void rt_completion_init(struct rt_completion* completion)
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{
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rt_base_t level;
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RT_ASSERT(completion != RT_NULL);
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level = rt_hw_interrupt_disable();
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completion->flag = RT_UNCOMPLETED;
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rt_list_init(&completion->suspended_list);
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rt_hw_interrupt_enable(level);
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}
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rt_err_t rt_completion_wait(struct rt_completion* completion, rt_int32_t timeout)
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{
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rt_err_t result;
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rt_base_t level;
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rt_thread_t thread;
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RT_ASSERT(completion != RT_NULL);
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result = RT_EOK;
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thread = rt_thread_self();
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level = rt_hw_interrupt_disable();
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if (completion->flag != RT_COMPLETED)
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{
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/* only one thread can suspend on complete */
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RT_ASSERT(rt_list_isempty(&(completion->suspended_list)));
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if (timeout == 0)
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{
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result = -RT_ETIMEOUT;
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goto __exit;
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}
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else
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{
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2012-05-01 17:52:48 +00:00
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/* reset thread error number */
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thread->error = RT_EOK;
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2012-04-23 06:02:28 +00:00
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/* suspend thread */
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rt_thread_suspend(thread);
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/* add to suspended list */
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rt_list_insert_before(&(completion->suspended_list), &(thread->tlist));
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/* current context checking */
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RT_DEBUG_NOT_IN_INTERRUPT;
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/* start timer */
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if (timeout > 0)
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{
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/* reset the timeout of thread timer and start it */
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rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, &timeout);
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rt_timer_start(&(thread->thread_timer));
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}
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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/* do schedule */
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rt_schedule();
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/* thread is waked up */
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result = thread->error;
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level = rt_hw_interrupt_disable();
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/* clean completed flag */
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completion->flag = RT_UNCOMPLETED;
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}
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}
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__exit:
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rt_hw_interrupt_enable(level);
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return result;
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}
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void rt_completion_done(struct rt_completion* completion)
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{
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rt_base_t level;
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RT_ASSERT(completion != RT_NULL);
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level = rt_hw_interrupt_disable();
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completion->flag = RT_COMPLETED;
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if (!rt_list_isempty(&(completion->suspended_list)))
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{
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/* there is one thread in suspended list */
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struct rt_thread *thread;
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/* get thread entry */
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thread = rt_list_entry(completion->suspended_list.next, struct rt_thread, tlist);
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2012-05-01 17:52:48 +00:00
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2012-04-23 06:02:28 +00:00
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/* resume it */
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rt_thread_resume(thread);
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rt_hw_interrupt_enable(level);
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/* perform a schedule */
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rt_schedule();
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}
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else
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{
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rt_hw_interrupt_enable(level);
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}
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}
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