0dcad8331b
The term 'context' is vague and overloaded. Its usage for 'an execution
context' is now referred as such, in both comments and some APIs' names.
When the execution context can only be a fiber or a task (i.e. not an
ISR), it is referred to as a 'thread', again in comments and everywhere
in the code.
APIs that had their names changed:
- nano_context_id_t is now nano_thread_id_t
- context_self_get() is now sys_thread_self_get()
- context_type_get() is now sys_execution_context_type_get()
- context_custom_data_set/get() are now
sys_thread_custom_data_set/get()
The 'context' prefix namespace does not have to be reserved by the
kernel anymore.
The Context Control Structure (CCS) data structure is now the Thread
Control Structure (TCS):
- struct ccs is now struct tcs
- tCCS is now tTCS
Change-Id: I7526a76c5b01e7c86333078e2d2e77c9feef5364
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/* wait queue for multiple fibers on nanokernel objects */
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/*
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* Copyright (c) 2015 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _kernel_nanokernel_include_wait_q__h_
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#define _kernel_nanokernel_include_wait_q__h_
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#include <nano_private.h>
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/* reset a wait queue, call during operation */
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static inline void _nano_wait_q_reset(struct _nano_queue *wait_q)
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{
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wait_q->head = (void *)0;
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wait_q->tail = (void *)&(wait_q->head);
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}
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/* initialize a wait queue: call only during object initialization */
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static inline void _nano_wait_q_init(struct _nano_queue *wait_q)
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{
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_nano_wait_q_reset(wait_q);
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}
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/*
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* Remove first fiber from a wait queue and put it on the ready queue, knowing
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* that the wait queue is not empty.
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*/
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static inline
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struct tcs *_nano_wait_q_remove_no_check(struct _nano_queue *wait_q)
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{
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struct tcs *tcs = wait_q->head;
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if (wait_q->tail == wait_q->head) {
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_nano_wait_q_reset(wait_q);
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} else {
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wait_q->head = tcs->link;
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}
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tcs->link = 0;
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_nano_fiber_schedule(tcs);
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return tcs;
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}
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/*
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* Remove first fiber from a wait queue and put it on the ready queue.
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* Abort and return NULL if the wait queue is empty.
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*/
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static inline struct tcs *_nano_wait_q_remove(struct _nano_queue *wait_q)
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{
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return wait_q->head ? _nano_wait_q_remove_no_check(wait_q) : NULL;
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}
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/* put current fiber on specified wait queue */
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static inline void _nano_wait_q_put(struct _nano_queue *wait_q)
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{
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((struct tcs *)wait_q->tail)->link = _nanokernel.current;
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wait_q->tail = _nanokernel.current;
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}
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#ifdef CONFIG_NANO_TIMEOUTS
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static inline void _nano_timeout_remove_tcs_from_wait_q(struct tcs *tcs)
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{
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struct _nano_queue *wait_q = tcs->nano_timeout.wait_q;
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if (wait_q->head == tcs) {
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if (wait_q->tail == wait_q->head) {
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_nano_wait_q_reset(wait_q);
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} else {
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wait_q->head = tcs->link;
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}
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} else {
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struct tcs *prev = wait_q->head;
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while (prev->link != tcs) {
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prev = prev->link;
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}
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prev->link = tcs->link;
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if (wait_q->tail == tcs) {
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wait_q->tail = prev;
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}
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}
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}
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#include <timeout_q.h>
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#else
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#define _nano_timeout_tcs_init(tcs) do { } while ((0))
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#define _nano_timeout_abort(tcs) do { } while ((0))
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#define _nano_get_earliest_timeouts_deadline() ((uint32_t)TICKS_UNLIMITED)
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#endif
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#endif /* _kernel_nanokernel_include_wait_q__h_ */
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