45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/*
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FUNCTION
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<<__tz_lock>>, <<__tz_unlock>>--lock time zone global variables
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INDEX
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__tz_lock
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INDEX
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__tz_unlock
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ANSI_SYNOPSIS
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#include "local.h"
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void __tz_lock (void);
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void __tz_unlock (void);
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TRAD_SYNOPSIS
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void __tz_lock();
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void __tz_unlock();
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DESCRIPTION
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The <<tzset>> facility functions call these functions when they need
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to ensure the values of global variables. The version of these routines supplied
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in the library do not do anything. If multiple threads of execution
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can call the time functions and give up scheduling in the middle, then you
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you need to define your own versions of these functions in order to
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safely lock the time zone variables during a call. If you do not, the results
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of <<localtime>>, <<mktime>>, <<ctime>>, and <<strftime>> are undefined.
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The lock <<__tz_lock>> may not be called recursively; that is,
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a call <<__tz_lock>> will always lock all subsequent <<__tz_lock>> calls
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until the corresponding <<__tz_unlock>> call on the same thread is made.
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*/
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#include <_ansi.h>
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#include "local.h"
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_VOID
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_DEFUN_VOID (__tz_lock)
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{
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}
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_VOID
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_DEFUN_VOID (__tz_unlock)
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{
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}
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