mirror of
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.
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
#ifndef __LIB_WAIT_H__
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#define __LIB_WAIT_H__
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#include <l4/lib/list.h>
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#include <l4/lib/spinlock.h>
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struct ktcb;
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struct waitqueue {
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struct list_head task_list;
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struct ktcb *task;
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};
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enum wakeup_flags {
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WAKEUP_INTERRUPT = (1 << 0),
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WAKEUP_SYNC = (1 << 1)
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};
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#define CREATE_WAITQUEUE_ON_STACK(wq, tsk) \
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struct waitqueue wq = { \
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.task_list = { &wq.task_list, &wq.task_list }, \
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.task = tsk, \
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};
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struct waitqueue_head {
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int sleepers;
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struct spinlock slock;
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struct list_head task_list;
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};
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static inline void waitqueue_head_init(struct waitqueue_head *head)
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{
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memset(head, 0, sizeof(struct waitqueue_head));
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INIT_LIST_HEAD(&head->task_list);
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}
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void task_set_wqh(struct ktcb *task, struct waitqueue_head *wqh,
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struct waitqueue *wq);
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void task_unset_wqh(struct ktcb *task);
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/*
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* Sleep if the given condition isn't true.
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* ret will tell whether condition was met
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* or we got interrupted.
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*/
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#define WAIT_EVENT(wqh, condition, ret) \
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do { \
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ret = 0; \
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for (;;) { \
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spin_lock(&(wqh)->slock); \
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if (condition) { \
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spin_unlock(&(wqh)->slock); \
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break; \
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} \
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CREATE_WAITQUEUE_ON_STACK(wq, current); \
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task_set_wqh(current, wqh, &wq); \
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(wqh)->sleepers++; \
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list_add_tail(&wq.task_list, &(wqh)->task_list);\
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printk("(%d) waiting...\n", current->tid); \
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sched_prepare_sleep(); \
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spin_unlock(&(wqh)->slock); \
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schedule(); \
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/* Did we wake up normally or get interrupted */\
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if (current->flags & TASK_INTERRUPTED) { \
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current->flags &= ~TASK_INTERRUPTED; \
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ret = -EINTR; \
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break; \
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} \
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} \
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} while(0);
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void wake_up(struct waitqueue_head *wqh, unsigned int flags);
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int wake_up_task(struct ktcb *task, unsigned int flags);
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void wake_up_all(struct waitqueue_head *wqh, unsigned int flags);
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#endif /* __LIB_WAIT_H__ */
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