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99 lines
3.4 KiB
99 lines
3.4 KiB
/*******************************************************************************
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* Copyright (C) 2018 Cadence Design Systems, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to use this Software with Cadence processor cores only and
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* not with any other processors and platforms, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************************/
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/*******************************************************************************
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* xf-sched.h
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*
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* Non-preemptive earliest-deadline-first scheduler
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*
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******************************************************************************/
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#ifndef __XF_SCHED_H
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#define __XF_SCHED_H
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/*******************************************************************************
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* Types definitions
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******************************************************************************/
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/* ...scheduler data */
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typedef rb_tree_t xf_sched_t;
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/* ...scheduling item */
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typedef rb_node_t xf_task_t;
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/*******************************************************************************
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* Helpers
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******************************************************************************/
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/* ...retrieve timestamp from task handle */
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static inline u32 xf_task_timestamp(xf_task_t *t)
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{
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/* ...wipe out last bit of "color" */
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return (((rb_node_t *)t)->color & ~1);
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}
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/* ...set task decoding timestamp */
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static inline u32 xf_task_timestamp_set(xf_task_t *t, u32 ts)
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{
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/* ...technically, wiping out last bit of timestamp is not needed */
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return (((rb_node_t *)t)->color = ts);
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}
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/* ...compare two timestamps with respect to wrap-around */
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static inline int xf_timestamp_before(u32 t0, u32 t1)
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{
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/* ...distance between active items is never high */
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return ((s32)(t0 - t1) < 0);
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}
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/* ...current scheduler timestamp */
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static inline u32 xf_sched_timestamp(xf_sched_t *sched)
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{
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/* ...don't quite care about last bit */
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return ((rb_tree_t *)sched)->root.color;
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}
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/* ...set scheduler timestamp */
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static inline u32 xf_sched_timestamp_set(xf_sched_t *sched, u32 ts)
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{
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/* ...wipe out last bit (black color is 0) */
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return (((rb_tree_t *)sched)->root.color = ts & ~0x1);
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}
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/*******************************************************************************
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* Entry points
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******************************************************************************/
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/* ...place message into scheduler queue */
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extern void xf_sched_put(xf_sched_t *sched, xf_task_t *t, u32 ts);
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/* ...get first item from the scheduler */
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extern xf_task_t * xf_sched_get(xf_sched_t *sched);
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/* ...cancel task execution */
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extern void xf_sched_cancel(xf_sched_t *sched, xf_task_t *t);
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/* ...initialize scheduler */
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extern void xf_sched_init(xf_sched_t *sched);
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#endif /* __XF_SCHED_H */
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