Re: [PATCH 1/2] Futex minor fixes

[Alex Riesen <alexander.riesen@synopsys.COM>]

Rusty Russell, Tue, Aug 26, 2003 05:05:56 +0200:
> Hi Andrew, Ingo,
> 
> 	This was posted before, but dropped.
> 
> Name: Minor futex comment tweaks and cleanups
> Author: Rusty Russell
> Status: Tested on 2.6.0-test4-bk2
> 
> D: Changes:
> D: 
> D: (1) don't return 0 from futex_wait if we are somehow
> D: spuriously woken up, return -EINTR on any such case,

But the code below does not mean there actually was a signal,
unless I'm missing something.

> -	if (time == 0) {
> -		ret = -ETIMEDOUT;
> -		goto out;
> -	}
> -	if (signal_pending(current))
> -		ret = -EINTR;
> -out:
> -	/* Were we woken up anyway? */
> +
> +	/* Were we woken up (and removed from queue)?  Always return
> +	 * success when this happens. */
>  	if (!unqueue_me(&q))
>  		ret = 0;
> +	else if (time == 0)
> +		ret = -ETIMEDOUT;
> +	else
> +		ret = -EINTR;
> +

Here. EINTR is often (if not always) assumed to be caused by a signal.
And someone may rightfully depend on it being that way.

-alex