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https://github.com/drasko/codezero.git
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aa2be891cd
- Implemented reasonable way to suspend task.
- A task that has a pending suspend would be interrupted
from its sleep via the suspender task.
- If suspend was raised and right after, task became about to sleep,
then scheduler wakes it up.
- If suspend was raised when task was in user mode, then an irq suspends it.
- Also suspends are checked at the end of a syscall so that if suspend was
raised because of a syscall from the task, the task is suspended before it
goes back to user mode.
- This mechanism is very similar to signals, and it may lead as a base for
implementing signal handling.
- Implemented common vma dropping for shadow vm object dropping and task exiting.
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
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* Scheduler and runqueue API definitions.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __SCHEDULER_H__
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#define __SCHEDULER_H__
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#include <l4/generic/tcb.h>
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#include INC_SUBARCH(mm.h)
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#include INC_GLUE(memory.h)
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/* Task priorities */
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#define TASK_PRIO_MAX 10
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#define TASK_PRIO_REALTIME 10
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#define TASK_PRIO_PAGER 8
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#define TASK_PRIO_SERVER 6
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#define TASK_PRIO_NORMAL 4
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#define TASK_PRIO_LOW 2
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/* Ticks per second, try ticks = 1000 + timeslice = 1 for regressed preemption test. */
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#define SCHED_TICKS 100
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/*
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* A task can run continuously at this granularity,
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* even if it has a greater total time slice.
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*/
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#define SCHED_GRANULARITY SCHED_TICKS/10
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static inline struct ktcb *current_task(void)
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{
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register u32 stack asm("sp");
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return (struct ktcb *)(stack & (~PAGE_MASK));
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}
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#define current current_task()
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#define need_resched (current->ts_need_resched)
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void sched_init_task(struct ktcb *task, int priority);
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void sched_prepare_sleep(void);
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void sched_suspend_sync(void);
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void sched_suspend_async(void);
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void sched_resume_sync(struct ktcb *task);
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void sched_resume_async(struct ktcb *task);
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void scheduler_start(void);
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void schedule(void);
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#endif /* __SCHEDULER_H__ */
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