On Thu, Jan 02, 2003 at 12:42:12PM -0800, S P wrote: > > 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. > Did you include include/asm-[my_arch]/semaphore.h? This is the header file in which those 2 files are defined as a function prototypes. Not includint it might be the reason of error. [That's only my guess.] -- tadeusz a. kadlubowski -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
