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Thread exiting

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Pagers kill all children but suspend themselves.
Currently not straightforward for a pager to delete its own tcb and quit.
It should take all allocator locks without sleeping, remove itself from
scheduler queue and then delete itself and quit. This is not so easy now
as some allocation locks are mutexes. (Address space lock, ktcb/space
allocators etc.)

An easier approach would be to have a kernel thread or a superior thread
that would delete the pager
This commit is contained in:
Bahadir Balban
2009-10-31 22:46:29 +02:00
parent c763679aaa
commit 5ed93b6563
4 changed files with 69 additions and 134 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
src/arch/arm/exception.c
View File

@@ -62,7 +62,7 @@ void ipc_restore_state(struct ipc_state *state)
}
/* Send data fault ipc to the faulty task's pager */
void fault_ipc_to_pager(u32 faulty_pc, u32 fsr, u32 far)
int fault_ipc_to_pager(u32 faulty_pc, u32 fsr, u32 far)
{
int err;
@@ -119,15 +119,24 @@ void fault_ipc_to_pager(u32 faulty_pc, u32 fsr, u32 far)
/* Send ipc to the task's pager */
if ((err = ipc_sendrecv(current->pagerid,
current->pagerid, 0)) < 0) {
printk("Thread (%d) faulted in kernel and its pager "
"returned error (%d). Suspend and exiting thread.\n",
current->tid, err);
BUG_ON(current->nlocks);
BUG_ON(current->nlocks);
/* Exit as if signalled */
current->flags |= TASK_EXITING;
sched_exit_sync();
/* Return on interrupt */
if (err == -EINTR) {
printk("Thread (%d) page-faulted "
"and got interrupted by its pager.\n",
current->tid);
return err;
} else { /* Suspend on any other error */
printk("Thread (%d) faulted in kernel "
"and an error occured during "
"page-fault ipc. err=%d. Suspending task.\n",
current->tid, err);
current->flags |= TASK_SUSPENDING;
sched_suspend_sync();
}
}
return 0;
}
/*
@@ -141,6 +150,7 @@ void fault_ipc_to_pager(u32 faulty_pc, u32 fsr, u32 far)
int pager_pagein_request(unsigned long addr, unsigned long size,
unsigned int flags)
{
int err;
u32 abort = 0;
unsigned long npages = __pfn(align_up(size, PAGE_SIZE));
struct ipc_state ipc_state;
@@ -154,7 +164,9 @@ int pager_pagein_request(unsigned long addr, unsigned long size,
/* For every page to be used by the kernel send a page-in request */
for (int i = 0; i < npages; i++)
fault_ipc_to_pager(0, abort, addr + (i * PAGE_SIZE));
if ((err = fault_ipc_to_pager(0, abort,
addr + (i * PAGE_SIZE))) < 0)
return err;
/* Restore ipc state */
ipc_restore_state(&ipc_state);
@@ -266,6 +278,11 @@ void data_abort_handler(u32 faulted_pc, u32 fsr, u32 far)
/* This notifies the pager */
fault_ipc_to_pager(faulted_pc, fsr, far);
if (current->flags & TASK_SUSPENDING) {
BUG_ON(current->nlocks);
sched_suspend_sync();
}
return;
error:
@@ -290,6 +307,11 @@ void prefetch_abort_handler(u32 faulted_pc, u32 fsr, u32 far, u32 lr)
if (KERN_ADDR(lr))
goto error;
fault_ipc_to_pager(faulted_pc, fsr, far);
if (current->flags & TASK_SUSPENDING) {
BUG_ON(current->nlocks);
sched_suspend_sync();
}
return;
error: