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authorRoland McGrath <roland@gnu.org>1996-07-23 21:40:11 +0000
committerRoland McGrath <roland@gnu.org>1996-07-23 21:40:11 +0000
commitb24be05f19d1471526b4643d96c078d32ec1c692 (patch)
tree63907e014c30ac36f9ab6714dce8e945da305deb /time/localtime.c
parente3047adb46007d1c8a81c0f10c74f7d4f8fdbd22 (diff)
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Tue Jul 23 02:49:58 1996 Ulrich Drepper <drepper@cygnus.com>
* locale/iso-4217.def: Add India to comment for symbol "INR ". Reported by Raja R Harinath <harinath@cs.umn.edu>. Sat Jul 20 14:03:45 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/dl-machine.h (elf_machine_rela): Remove bogus #undef RESOLVE. * time/tzset.c: Include <libc-lock.h>. (__tzset_lock): New lock variable. (tzset): New function (weak defn), no longer weak alias for __tzset. Call __tzset while holding __tzset_lock. * time/localtime.c: Include <libc-lock.h>. (__localtime_r): Hold __tzset_lock while doing the work.
Diffstat (limited to 'time/localtime.c')
-rw-r--r--time/localtime.c49
1 files changed, 28 insertions, 21 deletions
diff --git a/time/localtime.c b/time/localtime.c
index 4c68ab2..9dff89c 100644
--- a/time/localtime.c
+++ b/time/localtime.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1991, 1992, 1993, 1995 Free Software Foundation, Inc.
+/* localtime -- convert `time_t' to `struct tm' in local time zone
+Copyright (C) 1991, 92, 93, 95, 96 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -18,6 +19,7 @@ Cambridge, MA 02139, USA. */
#include <errno.h>
#include <time.h>
+#include <libc-lock.h>
/* The C Standard says that localtime and gmtime return the same pointer. */
struct tm _tmbuf;
@@ -35,7 +37,11 @@ __localtime_r (timer, tp)
const time_t *timer;
struct tm *tp;
{
- extern int __use_tzfile;
+ /* This lock is defined in tzset.c and locks all the data defined there
+ and in tzfile.c; the internal functions do no locking themselves.
+ This lock is only taken here and in `tzset'. */
+ __libc_lock_define (extern, __tzset_lock);
+ extern int __tzset_run, __use_tzfile;
extern int __tz_compute __P ((time_t timer, struct tm *tp));
extern int __tzfile_compute __P ((time_t timer,
long int *leap_correct, int *leap_hit));
@@ -48,36 +54,37 @@ __localtime_r (timer, tp)
return NULL;
}
- {
- /* Make sure the database is initialized. */
- extern int __tzset_run;
- if (! __tzset_run)
- __tzset ();
- }
+ __libc_lock_lock (__tzset_lock);
+
+ /* Make sure the database is initialized. */
+ if (! __tzset_run)
+ __tzset ();
if (__use_tzfile)
{
if (! __tzfile_compute (*timer, &leap_correction, &leap_extra_secs))
- return NULL;
+ tp = NULL;
}
else
{
- struct tm *gmtp = __gmtime_r (timer, tp);
- if (gmtp == NULL)
- return NULL;
-
- if (! __tz_compute (*timer, gmtp))
- return NULL;
-
+ tp = __gmtime_r (timer, tp);
+ if (tp && ! __tz_compute (*timer, tp))
+ tp = NULL;
leap_correction = 0L;
leap_extra_secs = 0;
}
- __offtime (timer, __timezone - leap_correction, tp);
- tp->tm_sec += leap_extra_secs;
- tp->tm_isdst = __daylight;
- tp->tm_gmtoff = __timezone;
- tp->tm_zone = __tzname[__daylight];
+ if (tp)
+ {
+ __offtime (timer, __timezone - leap_correction, tp);
+ tp->tm_sec += leap_extra_secs;
+ tp->tm_isdst = __daylight;
+ tp->tm_gmtoff = __timezone;
+ tp->tm_zone = __tzname[__daylight];
+ }
+
+ __libc_lock_unlock (__tzset_lock);
+
return tp;
}
weak_alias (__localtime_r, localtime_r)