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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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67
tasks/fs0/src/task.c
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@@ -33,46 +33,6 @@ struct tcb *find_task(int tid)
return 0;
}
/*
* Asks pager to send information about currently running tasks. Since this is
* called during initialisation, there can't be that many, so we assume message
* registers are sufficient. First argument tells how many there are, the rest
* tells the tids.
*/
int receive_pager_taskdata_orig(l4id_t *tdata)
{
int err;
/* Make the actual ipc call */
if ((err = l4_sendrecv(PAGER_TID, PAGER_TID,
L4_IPC_TAG_TASKDATA)) < 0) {
printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, err);
return err;
}
/* Check if call itself was successful */
if ((err = l4_get_retval()) < 0) {
printf("%s: Error: %d.\n", __FUNCTION__, err);
return err;
}
/* Read total number of tasks. Note already used one mr. */
if ((tdata[0] = (l4id_t)read_mr(L4SYS_ARG0)) >= MR_UNUSED_TOTAL) {
printf("%s: Error: Too many tasks to read. Won't fit in mrs.\n",
__FUNCTION__);
BUG();
}
// printf("%s: %d Total tasks.\n", __FUNCTION__, tdata[0]);
/* Now read task ids. */
for (int i = 0; i < (int)tdata[0]; i++) {
tdata[1 + i] = (l4id_t)read_mr(L4SYS_ARG1 + i);
// printf("%s: Task id: %d\n", __FUNCTION__, tdata[1 + i]);
}
return 0;
}
/* Allocate a task struct and initialise it */
struct tcb *create_tcb(void)
{
@@ -89,6 +49,15 @@ struct tcb *create_tcb(void)
return t;
}
void destroy_tcb(struct tcb *t)
{
kfree(t->fdpool);
list_del(&t->list);
tcb_head.total--;
kfree(t);
}
/*
* Attaches to task's utcb. FIXME: Add SHM_RDONLY and test it.
* FIXME: This calls the pager and is a potential for deadlock
@@ -156,6 +125,24 @@ int pager_notify_fork(struct tcb *sender, l4id_t parid,
}
/*
* Pager tells us that a task is exiting by this call.
*/
int pager_notify_exit(struct tcb *sender, l4id_t tid)
{
struct tcb *task;
printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
BUG_ON(!(task = find_task(tid)));
destroy_tcb(task);
printf("%s/%s: Exiting...\n", __TASKNAME__, __FUNCTION__);
return 0;
}
/* Read task information into the utcb page, since it won't fit into mrs. */
struct task_data_head *receive_pager_taskdata(void)
{