[LTP] [PATCH 1/2] syscalls/tkill: Convert tkill01 to the new API

[xieziyao <xieziyao@huawei.com>]

Hi, Petr, Cyril,

Learned a lot. Thanks for your review and modifications to the code.

Kind regards,
Ziyao

-----Original Message-----
From: Petr Vorel [mailto:pvorel@suse.cz] 
Sent: Thursday, April 29, 2021 2:05 AM
To: Cyril Hrubis <chrubis@suse.cz>
Cc: xieziyao <xieziyao@huawei.com>; ltp@lists.linux.it
Subject: Re: [LTP] [PATCH 1/2] syscalls/tkill: Convert tkill01 to the new API

Hi Cyril, Xie,

> > > +int sig_flag = 0;

> > It should be
> > static int sig_flag;

> It has to be volatile as well, if we are waiting in a bussy loop on it 
> and it's changed ansynchronously from a signal handler, otherwise 
> compiler may misoptimize the code.

> Generally the code that waits for a signal should look like:

> static volatile sig_atomic_t sig_flag;

Oh, yes, volatile. Thanks for other hints, code adjusted and whole patchset merged.

Kind regards,
Petr