/******************************************************************************
* Copyright (c) 2015-2024 jiangxiaogang<kerndev@foxmail.com>
*
* This file is part of KLite distribution.
*
* KLite is free software, you can redistribute it and/or modify it under
* the MIT Licence.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
******************************************************************************/
#include "internal.h"
#include "kernel.h"

struct cond
{
	struct tcb_list list;
};

cond_t cond_create(void)
{
	struct cond *cond;
	cond = heap_alloc(NULL, sizeof(struct cond));
	if(cond != NULL)
	{
		memset(cond, 0, sizeof(struct cond));
	}
	return (cond_t)cond;
}

void cond_delete(cond_t cond)
{
	heap_free(NULL, cond);
}

void cond_signal(cond_t cond)
{
	cpu_enter_critical();
	sched_tcb_wake_from((struct tcb_list *)cond);
	sched_preempt(false);
	cpu_leave_critical();
}

void cond_broadcast(cond_t cond)
{
	cpu_enter_critical();
	while(sched_tcb_wake_from((struct tcb_list *)cond));
	sched_preempt(false);
	cpu_leave_critical();
}

void cond_wait(cond_t cond, mutex_t mutex)
{
	cpu_enter_critical();
	sched_tcb_wait(sched_tcb_now, (struct tcb_list *)cond);
	mutex_unlock(mutex);
	sched_switch();
	cpu_leave_critical();
	mutex_lock(mutex);
}

uint32_t cond_timed_wait(cond_t cond, mutex_t mutex, uint32_t timeout)
{
	cpu_enter_critical();
	if(timeout == 0)
	{
		cpu_leave_critical();
		return false;
	}
	sched_tcb_timed_wait(sched_tcb_now, (struct tcb_list *)cond, timeout);
	mutex_unlock(mutex);
	sched_switch();
	cpu_leave_critical();
	mutex_lock(mutex);
	return sched_tcb_now->timeout;
}