Hi
On Tue, Apr 15, 2008 at 3:10 AM, bhanu nani <bhanu.lnxnew@xxxxxxxxx> wrote:
> The write method is:
>
> static DECLARE_WAIT_QUEUE_HEAD(muk_wait);
> static DECLARE_WAIT_QUEUE_HEAD(muk_wr_wait);
> wait_queue_t my_wait; /* init_wait(&my_wait) in mod init */
>
> ssize_t muk_write(struct file *filp, char const *buff, size_t count,
> loff_t *f_pos)
> {
> prepare_to_wait(&muk_wr_wait, &my_wait, TASK_INTERRUPTIBLE);
> schedule();
> finish_wait(&muk_wr_wait, &my_wait);
> }
>
> and the read method is as follows:
> ssize_t muk_read(struct file *filp, char *buff, size_t count, loff_t *f_pos)
> {
> write =FULL;
> wake_up_interruptible(&muk_wr_wait);
> return 0;
> }
>
> Whats heppens is:
> when I call my write first, it blocks up expected at schedule as it
> gives the processor way to CPU.
> But when I try to get the control back with a wakeup call from read,
> it is not able to wake the slepping Write process up.
try to use interruptible_sleep_on instead of prepare_to_wait().
http://lxr.linux.no/linux/kernel/sched.c#L3869
regards,
Mulyadi.
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