/*
FUNCTION
<<__tz_lock>>, <<__tz_unlock>>--lock time zone global variables

INDEX
	__tz_lock
INDEX
	__tz_unlock

ANSI_SYNOPSIS
	#include "local.h"
	void __tz_lock (void);
	void __tz_unlock (void);

TRAD_SYNOPSIS
	void __tz_lock();
	void __tz_unlock();

DESCRIPTION
The <<tzset>> facility functions call these functions when they need
to ensure the values of global variables.  The version of these routines supplied
in the library do not do anything.  If multiple threads of execution
can call the time functions and give up scheduling in the middle, then you
you need to define your own versions of these functions in order to
safely lock the time zone variables during a call.  If you do not, the results
of <<localtime>>, <<mktime>>, <<ctime>>, and <<strftime>> are undefined.

The lock <<__tz_lock>> may not be called recursively; that is,
a call <<__tz_lock>> will always lock all subsequent <<__tz_lock>> calls
until the corresponding <<__tz_unlock>> call on the same thread is made.
*/

#include <_ansi.h>
#include "local.h"

_VOID
_DEFUN_VOID (__tz_lock)
{
}

_VOID
_DEFUN_VOID (__tz_unlock)
{
}