Re: how to use wait_event_interruptible_timeout

From: manomugdha biswas (manomugdhab_at_yahoo.co.in)
Date: 09/13/05

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    Date:	Tue, 13 Sep 2005 14:49:06 +0100 (BST)
To: linux-kernel@vger.kernel.org

    Hi,
    I have a kernel module (kernel 2.6) where I have
    opened multiple tcp connections. when there is no data
    i want my process to sleep. For that i have added the
    following code.
     
    /* Initialise the wait q head */
      init_waitqueue_head(&VNICClientWQHead);

    init_waitqueue_entry(&(currentMap->waitQ), current);
    add_wait_queue(currentMap->sock->sk->sk_sleep,
    &(currentMap->waitQ));

    /* here currentMap is a structure containing tcp
    conenction info for my module. There is a currentMap
    for each tcp connection */

    wait_event_interruptible_timeout(VNICClientWQHead,
                                     0, HZ * 100000);

    I am not sure about the condition argument, 0.

    It is not working. How the condition is to be set here
    so that whenever data is available on any socket (tcp
    connection) the sleeping process gets waken up?

    Could anyone please give some light on this?

    Regards,
    Mano

    --- Gaurav Dhiman <gaurav4lkg@gmail.com> wrote:

    > On 9/13/05, manomugdha biswas
    > <manomugdhab@yahoo.co.in> wrote:
    > > Hi,
    > > I am using the this function in the following way:
    >
    > you are using it wrong way ....
    >
    > >
    > > wait_queue_head_t VNICClientWQHead;
    > >
    > > /* Initialise the wait q head */
    > > init_waitqueue_head(&VNICClientWQHead);
    > >
    > > init_waitqueue_entry(&waitQ, current);
    > > add_wait_queue(sock->sk->sk_sleep, waitQ));
    >
    > need not to do this at all, as all this is done by
    > wait_event_interruptible_timepout() function. Just
    > here you initialize
    > the head of the list.
    >
    > >
    > > /*
    > > my code, it reads data from socket
    > > */
    > >
    > > wait_event_interruptible_timeout(VNICClientWQHead,
    > 0,
    > > HZ * 100000);
    > >
    > > if no activity is to be done then this process
    > sleeps.
    > > When some data comes in socket i.e socket becomes
    > > readable this process should wake up. In kernel
    > 2.4 it
    > > was working fine using
    > interruptible_sleep_on_time().
    > > But it is not working in kernel 2.6 even if data
    > > arrives in socket! The sleeping process never wake
    > up.
    > > Could you please tell me what is the problem?
    > >
    > > Regards,
    > > Mano
    > >
    > >
    > > --- Gaurav Dhiman <gaurav4lkg@gmail.com> wrote:
    > >
    > > > On 9/13/05, manomugdha biswas
    > > > <manomugdhab@yahoo.co.in> wrote:
    > > > > Hi,
    > > > > I was using interruptible_sleep_on_timeout()
    > in
    > > > kernel
    > > > > 2.4. In kernel 2.6 I have use
    > > > > wait_event_interruptible_timeout. But it is
    > now
    > > > > working!!. interruptible_sleep_on_timeout()
    > was
    > > > > working fine. Could anyone please help me in
    > this
    > > > > regard.
    > > >
    > > > What problem are you facing with
    > > > wait_event_interruptible_timeout() in 2.6
    > > > Elaborate more on it.
    > > >
    > > > -Gaurav
    > > >
    > > > > Regards,
    > > > > Mano
    > > > >
    > > > > Manomugdha Biswas
    > > > >
    > > > >
    > > > >
    > > > >
    > > >
    > >
    >
    __________________________________________________________
    > > > > Yahoo! India Matrimony: Find your partner now.
    > Go
    > > > to http://yahoo.shaadi.com
    > > > > -
    > > > > To unsubscribe from this list: send the line
    > > > "unsubscribe linux-kernel" in
    > > > > the body of a message to
    > majordomo@vger.kernel.org
    > > > > More majordomo info at
    > > > http://vger.kernel.org/majordomo-info.html
    > > > > Please read the FAQ at
    > http://www.tux.org/lkml/
    > > > >
    > > >
    > > >
    > > > --
    > > > - Gaurav
    > > > my blog: http://lkdp.blogspot.com/
    > > > --
    > > > -
    > > > To unsubscribe from this list: send the line
    > > > "unsubscribe linux-kernel" in
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    > majordomo@vger.kernel.org
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    > > > Please read the FAQ at http://www.tux.org/lkml/
    > > >
    > >
    > >
    > > Manomugdha Biswas
    > >
    > >
    > >
    > >
    >
    __________________________________________________________
    > > Yahoo! India Matrimony: Find your partner now. Go
    > to http://yahoo.shaadi.com
    > >
    >
    >
    > --
    > - Gaurav
    > my blog: http://lkdp.blogspot.com/
    > --
    >

    Manomugdha Biswas

                    
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