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([2001:a61:2479:6801:d8fe:4132:9f23:7e8f]) by smtp.gmail.com with ESMTPSA id 70sm2410231wme.15.2020.09.10.23.44.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Sep 2020 23:44:56 -0700 (PDT) Cc: mtk.manpages@gmail.com, linux-man@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 22/24] membarrier.2: Note that glibc does not provide a wrapper To: Alejandro Colomar References: <20200910211344.3562-1-colomar.6.4.3@gmail.com> <20200910211344.3562-23-colomar.6.4.3@gmail.com> From: "Michael Kerrisk (man-pages)" Message-ID: <5aad6df9-3531-1b16-4d2d-97fb5cf423c2@gmail.com> Date: Fri, 11 Sep 2020 08:44:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200910211344.3562-23-colomar.6.4.3@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-man-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org On 9/10/20 11:13 PM, Alejandro Colomar wrote: > Notes: I copied .nf and .fi from futex.2, but they made no visual difference. > What do they actually do? > > Signed-off-by: Alejandro Colomar Thanks, Alex. Patch applied. Cheers, Michael > --- > man2/membarrier.2 | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/man2/membarrier.2 b/man2/membarrier.2 > index 8825de71e..f65c6be5c 100644 > --- a/man2/membarrier.2 > +++ b/man2/membarrier.2 > @@ -26,9 +26,15 @@ > .SH NAME > membarrier \- issue memory barriers on a set of threads > .SH SYNOPSIS > +.nf > +.PP > .B #include > .PP > .BI "int membarrier(int " cmd ", int " flags ");" > +.fi > +.PP > +.IR Note : > +There is no glibc wrapper for this system call; see NOTES. > .SH DESCRIPTION > The > .BR membarrier () > @@ -270,6 +276,9 @@ Examples where > .BR membarrier () > can be useful include implementations > of Read-Copy-Update libraries and garbage collectors. > +.PP > +Glibc does not provide a wrapper for this system call; call it using > +.BR syscall (2). > .SH EXAMPLES > Assuming a multithreaded application where "fast_path()" is executed > very frequently, and where "slow_path()" is executed infrequently, the > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/