Re: [LTP] [PATCH] Synchronization between two processes

[Subrata Modak <subrata@linux.vnet.ibm.com>]

On Fri, 2009-05-15 at 15:04 +0800, Gui Xiaohua wrote:
> The child-process wait SIGUSR1 which would be sended by parent-process,
> if the child-process execute sigtimedwait() after parent-process send 
> the signal, it would never receive the SIGUSR1 from parent-process.
> I cann't make sure the SIGUSR1 be sended after child-process execute 
> sigtimedwait() with 100 percent, and i try my best.
> 
> Signed-off-by: Gui Xiaohua <guixh@cn.fujitsu.com>

Over to Serge.

Regards--
Subrata

> --- testcases/kernel/containers/pidns/pidns12-old.c	2009-05-14 17:00:20.000000000 +0800
> +++ testcases/kernel/containers/pidns/pidns12.c	2009-05-15 15:15:22.000000000 +0800
> @@ -109,7 +109,7 @@ int child_fn(void *arg)
>  	}
> 
>  	/* Set timeout for sigtimedwait */
> -	timeout.tv_sec = 3;
> +	timeout.tv_sec = 10;
>  	timeout.tv_nsec = 0;
> 
>  	/* Set mask to wait for SIGUSR1 signal */
> @@ -182,6 +182,9 @@ int main(int argc, char *argv[])
>  		cleanup();
>  	}
> 
> +	/*Try best to make sure the SIGUSR1 be sended after child-process execute sigtimedwait*/
> +	sleep(5);
> +
>  	/* Send SIGUSR1 to container init */
>  	if (kill(cpid, SIGUSR1) == -1) {
>  		tst_resm(TBROK, "parent: kill() failed(%s).", strerror(errno));
> 
> 
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