test-example-projects/c_projects/30wklite/sources/opt/event_flags.c

/******************************************************************************
* Copyright (c) 2015-2023 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 <string.h>
#include "kernel.h"
#include "event_flags.h"

struct event_flags
{
	mutex_t  mutex;
	cond_t   cond;
	uint32_t bits;
};

event_flags_t event_flags_create(void)
{
	struct event_flags *flags;
	flags = heap_alloc(NULL, sizeof(struct event_flags));
	if(flags != NULL)
	{
		memset(flags, 0, sizeof(struct event_flags));
		flags->mutex = mutex_create();
		if(flags->mutex == NULL)
		{
			heap_free(NULL, flags);
			return NULL;
		}
		flags->cond = cond_create();
		if(flags->cond == NULL)
		{
			mutex_delete(flags->mutex);
			heap_free(NULL, flags);
			return NULL;
		}
	}
	return flags;
}

void event_flags_delete(event_flags_t flags)
{
	mutex_delete(flags->mutex);
	cond_delete(flags->cond);
	heap_free(NULL, flags);
}

void event_flags_set(event_flags_t flags, uint32_t bits)
{
	mutex_lock(flags->mutex);
	flags->bits |= bits;
	mutex_unlock(flags->mutex);
	cond_broadcast(flags->cond);
}

void event_flags_reset(event_flags_t flags, uint32_t bits)
{
	mutex_lock(flags->mutex);
	flags->bits &= ~bits;
	mutex_unlock(flags->mutex);
}

static uint32_t try_wait_bits(event_flags_t flags, uint32_t bits, uint32_t ops)
{
	uint32_t cmp;
	uint32_t wait_all;
	cmp = flags->bits & bits;
	wait_all = ops & EVENT_FLAGS_WAIT_ALL;
	if((wait_all && (cmp == bits)) || ((!wait_all) && (cmp != 0)))
	{
		if(ops & EVENT_FLAGS_AUTO_RESET)
		{
			flags->bits &= ~bits;
		}
		return cmp;
	}
	return 0;
}

uint32_t event_flags_wait(event_flags_t flags, uint32_t bits, uint32_t ops)
{
	uint32_t ret;
	mutex_lock(flags->mutex);
	while(1)
	{
		ret = try_wait_bits(flags, bits, ops);
		if(ret != 0)
		{
			break;
		}
		cond_wait(flags->cond, flags->mutex);
	}
	mutex_unlock(flags->mutex);
	return ret;
}

uint32_t event_flags_timed_wait(event_flags_t flags, uint32_t bits, uint32_t ops, uint32_t timeout)
{
	uint32_t ret;
	mutex_lock(flags->mutex);
	while(1)
	{
		ret = try_wait_bits(flags, bits, ops);
		if((ret != 0) || (timeout == 0))
		{
			break;
		}
		timeout = cond_timed_wait(flags->cond, flags->mutex, timeout);
	}
	mutex_unlock(flags->mutex);
	return ret;
}