DMARC-Filter:	OpenDMARC Filter v1.4.2 delorie.com 56GEsbWk3154032
Authentication-Results:	delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com
Authentication-Results:	delorie.com; spf=pass smtp.mailfrom=cygwin.com
DKIM-Filter:	OpenDKIM Filter v2.11.0 delorie.com 56GEsbWk3154032
Authentication-Results:	delorie.com;
	dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=QOGAqiFJ
X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 300B7385780D
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1752677676;
	bh=RcJAGR32BQ69Q6uV0ncxNFk1P8GZb5fORuulcI1Lajs=;
	h=Date:To:Subject:In-Reply-To:References:List-Id:List-Unsubscribe:
	List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:
	From;
	b=QOGAqiFJRICfmP73ZsdhveS6UJUPk+wvTxL/oEMG1SpZOvfpjGr0gt4WL5DXqP4b5
	Uyv153BFSythzBZ8+oO3x8ymERV8uZaSSC7ZwanP93tZM7Rvbj1TPIwka3u5NRHqLL
	h3E9oKiFG2EYPH56zRX7n0AVxX9d7IC5gkRoJHjw=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.2 sourceware.org F38343857B90
ARC-Filter:	OpenARC Filter v1.0.0 sourceware.org F38343857B90
ARC-Seal:	i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1752677566; cv=none;
	b=BDJp8owhBp3QvApOx02Z/9I/g0J5FRPTz0HPikoAS9pAupI7r5IGqqCyk+VdhMj3nHGDzfQglmyCwuc4U+Max7ealOHiSDjwA1tZtK85t2Kr63htH5mfa75NutUZ5FIUahb+j20aFBf1D7hrpXAMCENj9VYtR7UKy4k21XPDRLs=
ARC-Message-Signature:	i=1; a=rsa-sha256; d=sourceware.org; s=key;
	t=1752677566; c=relaxed/simple;
	bh=O8Ng51FSHirOnBU590VY6CbL3xGW1dAcpzeMv6MGnD8=;
	h=Date:From:To:Subject:Message-Id:Mime-Version:DKIM-Signature;
	b=U/Smx8QYcsdnHn4Xu1AFlMn84YCEMr1cUAjU9NmkmlyQQtNHzMSJ5JJGNzm32wNt53FbuumGExU9L4fM8lPXxYZDToFkhFCo9LpeUXfFcycSKOmULp7tGJiJxUHZZUN5aKb4egbid9EABO7PpussWtuZsK6IFpv0RFfopeGSejU=
ARC-Authentication-Results:	i=1; server2.sourceware.org
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org F38343857B90
Date:	Wed, 16 Jul 2025 23:52:36 +0900
To:	cygwin AT cygwin DOT com
Subject:	Re: Calling system() in multi-threads.
Message-Id:	<20250716235236.96055ec145d9a0528b50c357@nifty.ne.jp>
In-Reply-To:	<20250618203127.71ac180de11230a9a6055185@nifty.ne.jp>
References:	<20250617215411 DOT ebf69d1c18b55191a1b76c01 AT nifty DOT ne DOT jp>
	<eb7786ee-dc7a-4689-9d17-b842e581d7c7 AT maxrnd DOT com>
	<20250618203127 DOT 71ac180de11230a9a6055185 AT nifty DOT ne DOT jp>
X-Mailer:	Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32)
Mime-Version:	1.0
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.30
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
Errors-To:	cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Hi Corinna,

On Wed, 18 Jun 2025 20:31:27 +0900
Takashi Yano wrote:
> On Tue, 17 Jun 2025 15:42:26 -0700
> Mark Geisert wrote:
> > Hi Takashi,
> > 
> > On 6/17/2025 5:54 AM, Takashi Yano via Cygwin wrote:
> > > Hi,
> > > 
> > > If system() is called in parallel in threads, system()
> > > fails with exit code 127.
> > > 
> > > Just compile pthread_system.c attached and run.
> > > 
> > > I believe system() is multi-thread safe so the STC
> > > should work.
> > 
> > I regret to inform that system() is not currently MT-safe.  I discovered 
> > this a few years ago when porting YAFU (Yet Another Factoring Utility).
> > 
> > I ended up supplying a wrapper that serialized the system() call itself 
> > but allowed multiple wrappers (and thus child processes) to be running 
> > at the same time.  I never got around to supplying a fix for Cygwin. 
> > I've attached the code.
> > HTH somehow,
> 
> Thanks for the information. I guess the cause is that accessing
> child_info_spawn NO_COPY ch_spawn;
> in spwan.cc conflicts with other threads. I wonder ch_spawn should
> be thread-specific. Or should be guarded by lock.

Do you have any idea?

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -