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Re: new files imported without new modules added
From: |
Eric Blake |
Subject: |
Re: new files imported without new modules added |
Date: |
Tue, 24 May 2011 15:46:13 -0600 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc14 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.10 |
On 05/24/2011 03:39 PM, Bruno Haible wrote:
> 1) In code that ends up in lisp.run (e.g. errunix.d). This executable has
> the option to use multiple threads. Therefore strerror_r should be
> used instead of strerror(), because - as Eric explained - when you
> call strerror(EACCES) in one thread and strerror(ENOENT) in another
> thread at nearly the same time, by the time you retrieve the error
> message
> in the first thread, it might read "Permissionle or directory".
> YES, even for fixed error messages, strerror() uses a static buffer
> in the majority of OSes (at least on NetBSD, HP-UX, native Win32,
> Cygwin).
Not cygwin (it uses a thread-local buffer for "Unknown error", and
direct string pointers for known errors), but I can indeed confirm that
FreeBSD 8.2 returns the same pointer for multiple strerror() results,
and if that pointer is not thread-local, you have problems in a
multi-threaded app.
--
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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- Re: strerror vs. threads, (continued)
- Re: strerror vs. threads, Simon Josefsson, 2011/05/24
- Re: strerror vs. threads, Eric Blake, 2011/05/24
- Re: strerror vs. threads, Simon Josefsson, 2011/05/25
- Re: strerror vs. threads, Eric Blake, 2011/05/25
- coping with conflicting strerror_r signatures [was: strerror vs. threads], Eric Blake, 2011/05/25
- Re: strerror vs. threads [was: new files imported without new modules added], Sam Steingold, 2011/05/24
- Re: strerror vs. threads [was: new files imported without new modules added], Eric Blake, 2011/05/24
- [PATCH 1/2] perror: call strerror_r directly, Eric Blake, 2011/05/24
- [PATCH 2/2] strerror: drop strerror_r dependency, Eric Blake, 2011/05/24
- Re: new files imported without new modules added, Bruno Haible, 2011/05/24
- Re: new files imported without new modules added,
Eric Blake <=