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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _OS_SCHED_H_
#define _OS_SCHED_H_ 1
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include <os/spinlock.h>
#define SCHED_NQUEUES 4
/*
* Represents a queue of processes
*
* @q; Actual queue
* @nproc: Number of processes in this queue
*/
struct sched_queue {
TAILQ_HEAD(, proc) q;
struct spinlock lock;
size_t nproc;
};
/*
* Enqueue a new process to a queue
*
* @q: Queue to target
* @proc: Process to place in the queue
*
* Returns zero on success, otherwise a less than
* zero value to indicate failure.
*/
int sched_enq(struct sched_queue *q, struct proc *proc);
/*
* Dequeue a process from a queue
*
* @q: Queue to dequeue from
* @procp: Result of new popped process is written here
*
* Returns zero on success, otherwise a less than zero
* value on failure.
*/
int sched_deq(struct sched_queue *q, struct proc **procp);
/*
* Initialize the scheduler into a basic
* known state.
*/
void sched_init(void);
#endif /* !_OS_SCHED_H_ */
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