On Sat, Sep 04, 1999 at 05:55:38PM +0530, sushil@iitk.ac.in wrote:
> Hi,
> I am running linux 2.9.9 kernel.
> I am trying the understand the locking mechanism used in linux to make
> the kernel SMP safe. In do_fork() (also in many other syscall interface
> functions) there is call to lock_kernel() function. What does
> lock_kernel() do? If it is used to synchronize the access to kernel data
> structures from other processes on other processors, then why, after
> having called this function, we again try to do some locking like calling
> spin_lock(&lastpid_lock) in get_pid()?
>
> I have seen the definition of lock_kernel. It increments the
> current->lock_depth and if it nonzero then tries to lock the kernel_flag
> variable.
>
> Kindly reply.
> I am on this mailing list.
>
> Thanks,
> Sushil.
>
>
>
>
>
> -
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