Re: Semaphore

["Rupa" <rupa.ramakrishna@ionidea.com>]

Hello,

   I have used semaphore for locking in my kernel module. It is working fine. I am able to compile and install the module.

   I have just used asm/semaphore.h in my include files.

Rupa

----- Original Message -----

From: S P

To: kernelnewbies@nl.linux.org

Sent: Friday, January 03, 2003 2:12 AM

Subject: Semaphore

Hi,

I am trying to use semaphore for locking. Following is the piece of code I am using :

struct semaphore mr_sem;

sema_init(&mr_sem, 1); /* usage count is 1 */

if (down_interruptible(&mr_sem))
  /* semaphore not acquired; received a signal ... */

/* critical region (semaphore acquired) ... */

up(&mr_sem);

 

The compilation is done using gcc with options _D__KERNEL__. It compiles properly, but the linking gives some errors regards to __down_failed_interruptible and __up_wakeup.

Do I need to specify some other options for the compilation.

Thanks for the help.

-SP

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