mirror of
https://github.com/drasko/codezero.git
synced 2026-01-12 02:43:15 +01:00
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__
|
|
#define __LIB_WAIT_H__
|
|
|
|
#include <l4/lib/list.h>
|
|
#include <l4/lib/spinlock.h>
|
|
|
|
struct ktcb;
|
|
struct waitqueue {
|
|
struct list_head task_list;
|
|
struct ktcb *task;
|
|
};
|
|
|
|
enum wakeup_flags {
|
|
WAKEUP_INTERRUPT = (1 << 0),
|
|
WAKEUP_SYNC = (1 << 1)
|
|
};
|
|
|
|
#define CREATE_WAITQUEUE_ON_STACK(wq, tsk) \
|
|
struct waitqueue wq = { \
|
|
.task_list = { &wq.task_list, &wq.task_list }, \
|
|
.task = tsk, \
|
|
};
|
|
|
|
struct waitqueue_head {
|
|
int sleepers;
|
|
struct spinlock slock;
|
|
struct list_head task_list;
|
|
};
|
|
|
|
static inline void waitqueue_head_init(struct waitqueue_head *head)
|
|
{
|
|
memset(head, 0, sizeof(struct waitqueue_head));
|
|
INIT_LIST_HEAD(&head->task_list);
|
|
}
|
|
|
|
void task_set_wqh(struct ktcb *task, struct waitqueue_head *wqh,
|
|
struct waitqueue *wq);
|
|
|
|
void task_unset_wqh(struct ktcb *task);
|
|
|
|
|
|
/*
|
|
* Sleep if the given condition isn't true.
|
|
* ret will tell whether condition was met
|
|
* or we got interrupted.
|
|
*/
|
|
#define WAIT_EVENT(wqh, condition, ret) \
|
|
do { \
|
|
ret = 0; \
|
|
for (;;) { \
|
|
spin_lock(&(wqh)->slock); \
|
|
if (condition) { \
|
|
spin_unlock(&(wqh)->slock); \
|
|
break; \
|
|
} \
|
|
CREATE_WAITQUEUE_ON_STACK(wq, current); \
|
|
task_set_wqh(current, wqh, &wq); \
|
|
(wqh)->sleepers++; \
|
|
list_add_tail(&wq.task_list, &(wqh)->task_list);\
|
|
printk("(%d) waiting...\n", current->tid); \
|
|
sched_prepare_sleep(); \
|
|
spin_unlock(&(wqh)->slock); \
|
|
schedule(); \
|
|
/* Did we wake up normally or get interrupted */\
|
|
if (current->flags & TASK_INTERRUPTED) { \
|
|
current->flags &= ~TASK_INTERRUPTED; \
|
|
ret = -EINTR; \
|
|
break; \
|
|
} \
|
|
} \
|
|
} while(0);
|
|
|
|
void wake_up(struct waitqueue_head *wqh, unsigned int flags);
|
|
int wake_up_task(struct ktcb *task, unsigned int flags);
|
|
void wake_up_all(struct waitqueue_head *wqh, unsigned int flags);
|
|
|
|
#endif /* __LIB_WAIT_H__ */
|
|
|