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Re: [RFA]: fork safe stdio locks

From: Jeff Johnston <jjohnstn at redhat dot com>
To: Thomas Pfaff <tpfaff at gmx dot net>
Cc: newlib at sources dot redhat dot com
Date: Tue, 09 Mar 2004 16:30:18 -0500
Subject: Re: [RFA]: fork safe stdio locks
References: <404CD004.3090307@gmx.net>

Patch checked in with slight modification.  I changed the __fp_lock() and
__fp_unlock() routines to use _flockfile() and _funlockfile().

-- Jeff J.

Thomas Pfaff wrote:

As i already mentioned i think that stdio locks should be locked at fork and unlocked in both the parent and the child afterwards to avoid a deadlock in the child process (at least when you are working with pthread mutexes for locking).

The attached patch will add 2 functions to findfp.c which can be called at before and after fork.

Thomas

2004-03-08 Thomas Pfaff <tpfaff@gmx.net>
    * libc/stdio/findfp.c (__sfp): Rename lock to __sfp_lock.
    Change __sfp_lock to static global.
    (__fp_lock): New static function.
    (__fp_unlock): Ditto.
    (__fp_lock_all): New function.
    (__fp_unlock_all): Ditto.

References:
- [RFA]: fork safe stdio locks
  - From: Thomas Pfaff

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