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Multiple updates on sleeping, vma dropping and thread suspend.

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- Updated sleeping paths such that a task is atomically put into
  a runqueue and made RUNNABLE, or removed from a runqueue and made SLEEPING.
- Modified vma dropping sources to handle both copy_on_write() and exit() cases
  in a common function.
- Added the first infrastructure to have a pager to suspend a task and wait for
  suspend completion from the scheduler.
This commit is contained in:
Bahadir Balban
2008-10-13 12:22:10 +03:00
parent f6d0a79298
commit 0db0f7e334
23 changed files with 416 additions and 200 deletions
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7
src/lib/mutex.c
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@@ -51,7 +51,7 @@ void sem_up(struct mutex *mutex)
INIT_LIST_HEAD(&wq.task_list);
list_add_tail(&wq.task_list, &mutex->wq.task_list);
mutex->sleepers++;
current->state = TASK_SLEEPING;
sched_prepare_sleep();
printk("(%d) produced, now sleeping...\n", current->tid);
spin_unlock(&mutex->slock);
schedule();
@@ -89,7 +89,7 @@ void sem_down(struct mutex *mutex)
INIT_LIST_HEAD(&wq.task_list);
list_add_tail(&wq.task_list, &mutex->wq.task_list);
mutex->sleepers++;
current->state = TASK_SLEEPING;
sched_prepare_sleep();
printk("(%d) Waiting to consume, now sleeping...\n", current->tid);
spin_unlock(&mutex->slock);
schedule();
@@ -124,7 +124,7 @@ int mutex_lock(struct mutex *mutex)
task_set_wqh(current, &mutex->wqh, &wq);
list_add_tail(&wq.task_list, &mutex->wqh.task_list);
mutex->wqh.sleepers++;
current->state = TASK_SLEEPING;
sched_prepare_sleep();
spin_unlock(&mutex->wqh.slock);
printk("(%d) sleeping...\n", current->tid);
schedule();
@@ -160,7 +160,6 @@ void mutex_unlock(struct mutex *mutex)
BUG_ON(list_empty(&mutex->wqh.task_list));
list_del_init(&wq->task_list);
mutex->wqh.sleepers--;
sleeper->state = TASK_RUNNABLE;
spin_unlock(&mutex->wqh.slock);
/*