89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
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* Copyright (c) 2010-2015 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** @file
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*
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* @brief dynamic-size LIFO queue object
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*/
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#include <kernel.h>
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#include <nano_private.h>
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#include <misc/debug/object_tracing_common.h>
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#include <toolchain.h>
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#include <sections.h>
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#include <wait_q.h>
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#include <sched.h>
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void k_lifo_init(struct k_lifo *lifo)
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{
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lifo->list = (void *)0;
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sys_dlist_init(&lifo->wait_q);
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SYS_TRACING_OBJ_INIT(k_lifo, lifo);
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}
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void k_lifo_put(struct k_lifo *lifo, void *data)
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{
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struct k_thread *first_pending_thread;
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unsigned int key;
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key = irq_lock();
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first_pending_thread = _unpend_first_thread(&lifo->wait_q);
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if (first_pending_thread) {
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_timeout_abort(first_pending_thread);
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_ready_thread(first_pending_thread);
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_set_thread_return_value_with_data(first_pending_thread,
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0, data);
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if (!_is_in_isr() && _must_switch_threads()) {
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(void)_Swap(key);
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return;
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}
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} else {
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*(void **)data = lifo->list;
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lifo->list = data;
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}
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irq_unlock(key);
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}
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void *k_lifo_get(struct k_lifo *lifo, int32_t timeout)
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{
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unsigned int key;
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void *data;
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key = irq_lock();
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if (likely(lifo->list)) {
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data = lifo->list;
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lifo->list = *(void **)data;
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irq_unlock(key);
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return data;
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}
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if (timeout == K_NO_WAIT) {
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irq_unlock(key);
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return NULL;
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}
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_pend_current_thread(&lifo->wait_q, timeout);
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return _Swap(key) ? NULL : _current->swap_data;
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}
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