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/*

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 use the lock API defined in sys/lock.h.  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"

#include <sys/lock.h>

#ifndef __SINGLE_THREAD__

__LOCK_INIT(static, __tz_lock_object);

#endif

_VOID

_DEFUN_VOID (__tz_lock)

{

#ifndef __SINGLE_THREAD__

  __lock_acquire(__tz_lock_object);

#endif

}

_VOID

_DEFUN_VOID (__tz_unlock)

{

#ifndef __SINGLE_THREAD__

  __lock_release(__tz_lock_object);

#endif

}