wait_event() problems
I have been trying to get the following to work:
atomic_t stop;
struct wait_queue wait_queue_stuff, another_wait_queue;
/* Initialized before use with init_wait_queue() */
kernel_thread()
{
for(;;)
{
if(atomic_read(stop))
interruptible_sleep_on(_queue_stuff);
do_regular_stuff();
}
}
ioctl_start()
{
if(waitqueue_active(_queue_stuff))
{
atomic_set(, 0);
wake_up_interruptible(_queue_stuff);
}
}
ioctl_stop()
{
if(!waitqueue_active(_queue_stuff))
{
atomic_set(, 1);
wait_event(another_wait_queue, waitqueue_active(_queue_stuff));
}
}
The problem is that when ioctl_stop() is executed, the kernel thread
never gets any CPU time so it remains stuck in "D" state forever.
Maybe I'm doing something wrong, but something seems to be broken.
The following patch 'fixes' it.
--- linux-2.4.1/include/linux/sched.h.orig Tue Jul 3 15:14:07 2001
+++ linux-2.4.1/include/linux/sched.h Tue Jul 3 15:16:27 2001
@@ -763,6 +763,7 @@
set_current_state(TASK_UNINTERRUPTIBLE);\
if (condition) \
break; \
+current->policy = SCHED_YIELD; \
schedule(); \
} \
current->state = TASK_RUNNING; \
Cheers,
Dick Johnson
Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).
I was going to compile a list of innovations that could be
attributed to Microsoft. Once I realized that Ctrl-Alt-Del
was handled in the BIOS, I found that there aren't any.
-
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Please read the FAQ at http://www.tux.org/lkml/
wait_event() problems patch
I have been trying to get the following to work:
atomic_t stop;
struct wait_queue wait_queue_stuff, another_wait_queue;
/* Initialized before use with init_wait_queue() */
kernel_thread()
{
for(;;)
{
if(atomic_read(stop))
interruptible_sleep_on(wait_queue_stuff);
do_regular_stuff();
}
}
ioctl_start()
{
if(waitqueue_active(wait_queue_stuff))
{
atomic_set(stop, 0);
wake_up_interruptible(wait_queue_stuff);
}
}
ioctl_stop()
{
if(!waitqueue_active(wait_queue_stuff))
{
atomic_set(stop, 1);
wait_event(another_wait_queue, waitqueue_active(wait_queue_stuff));
}
}
The problem is that when ioctl_stop() is executed, the kernel thread
never gets any CPU time so it remains stuck in D state forever.
Maybe I'm doing something wrong, but something seems to be broken.
The following patch 'fixes' it.
--- linux-2.4.1/include/linux/sched.h.orig Tue Jul 3 15:14:07 2001
+++ linux-2.4.1/include/linux/sched.h Tue Jul 3 15:16:27 2001
@@ -763,6 +763,7 @@
set_current_state(TASK_UNINTERRUPTIBLE);\
if (condition) \
break; \
+current-policy = SCHED_YIELD; \
schedule(); \
} \
current-state = TASK_RUNNING; \
Cheers,
Dick Johnson
Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).
I was going to compile a list of innovations that could be
attributed to Microsoft. Once I realized that Ctrl-Alt-Del
was handled in the BIOS, I found that there aren't any.
-
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
