[RFA]: fork safe stdio locks

[Thomas Pfaff]

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.
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