Re: signal

[Abhishek Kumar <yaduabhi@xxxxxxxxx>]

signal in the term of UNIX signals is as explained but if there is  a
high  priority process like a NMI then syscall execution yields
control to processing the interrupt

-Abhishek



On 7/7/05, Gaurav Dhiman <gaurav4lkg@xxxxxxxxx> wrote:
> On 07 Jul 2005 12:34:15 +0530, Anurag Verma <averma@xxxxxxxxxxxxxxxxxxx> wrote:
> > Hi All
> > Can u please tell me when a process is busy in executing a system call,
> > and then another process sends a signal then what will happen to the
> > exectution of system call. Will it be interrupted ?
> 
> No, Signals are handled while returning from system calls or
> interrupts handlers. When process P1 is executing the system call code
> in kernel, and another process sends the signal to it, it kernel will
> give the controol to signal handler while returning from that system
> call or the interrupt handler (whatever the next interrupt occurs),
> whichever occurs first.
> 
> > If not then once the system call execution is finished then the signal
> > handler will be invoked?
> 
> Well it will be invoked before that only, because timer interrupts
> occur too freq and while returing from its handler, kernel will check
> the pending signals for currenly running process and invoke the
> registered signal handlers.
> 
> -Gaurav
> 
> > Please clarify me.
> > Thanks in advance.
> > bye
> > Anu
> >
> >
> >
> >
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