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133 lines
3.4 KiB
133 lines
3.4 KiB
/******************************************************************************
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* Copyright (c) 2015-2023 jiangxiaogang<kerndev@foxmail.com>
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*
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* This file is part of KLite distribution.
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*
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* KLite is free software, you can redistribute it and/or modify it under
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* the MIT Licence.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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******************************************************************************/
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#include <string.h>
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#include "kernel.h"
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#include "event_flags.h"
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struct event_flags
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{
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mutex_t mutex;
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cond_t cond;
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uint32_t bits;
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};
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event_flags_t event_flags_create(void)
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{
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struct event_flags *flags;
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flags = heap_alloc(NULL, sizeof(struct event_flags));
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if(flags != NULL)
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{
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memset(flags, 0, sizeof(struct event_flags));
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flags->mutex = mutex_create();
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if(flags->mutex == NULL)
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{
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heap_free(NULL, flags);
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return NULL;
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}
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flags->cond = cond_create();
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if(flags->cond == NULL)
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{
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mutex_delete(flags->mutex);
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heap_free(NULL, flags);
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return NULL;
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}
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}
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return flags;
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}
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void event_flags_delete(event_flags_t flags)
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{
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mutex_delete(flags->mutex);
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cond_delete(flags->cond);
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heap_free(NULL, flags);
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}
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void event_flags_set(event_flags_t flags, uint32_t bits)
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{
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mutex_lock(flags->mutex);
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flags->bits |= bits;
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mutex_unlock(flags->mutex);
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cond_broadcast(flags->cond);
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}
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void event_flags_reset(event_flags_t flags, uint32_t bits)
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{
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mutex_lock(flags->mutex);
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flags->bits &= ~bits;
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mutex_unlock(flags->mutex);
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}
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static uint32_t try_wait_bits(event_flags_t flags, uint32_t bits, uint32_t ops)
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{
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uint32_t cmp;
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uint32_t wait_all;
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cmp = flags->bits & bits;
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wait_all = ops & EVENT_FLAGS_WAIT_ALL;
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if((wait_all && (cmp == bits)) || ((!wait_all) && (cmp != 0)))
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{
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if(ops & EVENT_FLAGS_AUTO_RESET)
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{
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flags->bits &= ~bits;
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}
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return cmp;
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}
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return 0;
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}
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uint32_t event_flags_wait(event_flags_t flags, uint32_t bits, uint32_t ops)
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{
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uint32_t ret;
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mutex_lock(flags->mutex);
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while(1)
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{
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ret = try_wait_bits(flags, bits, ops);
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if(ret != 0)
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{
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break;
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}
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cond_wait(flags->cond, flags->mutex);
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}
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mutex_unlock(flags->mutex);
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return ret;
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}
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uint32_t event_flags_timed_wait(event_flags_t flags, uint32_t bits, uint32_t ops, uint32_t timeout)
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{
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uint32_t ret;
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mutex_lock(flags->mutex);
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while(1)
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{
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ret = try_wait_bits(flags, bits, ops);
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if((ret != 0) || (timeout == 0))
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{
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break;
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}
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timeout = cond_timed_wait(flags->cond, flags->mutex, timeout);
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}
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mutex_unlock(flags->mutex);
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return ret;
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}
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