From af27ab5c3bb6e0ef5d4f618a4f1b99e72060b424 Mon Sep 17 00:00:00 2001
From: ken <unknown>
Date: Tue, 24 Jul 2001 04:39:32 +0000
Subject: [PATCH] [project @ 2001-07-24 04:39:31 by ken] Make the Time module
 thread-safe by calling the reentrant functions gmtime_r and
 localtime_r instead of gmtime and localtime wherever they
 are available.

(This is necessary to make Time work at all on our Alpha machine --
perhaps GHC tickles the reentrancy of the C library or something?)
---
 configure.in         |    2 +-
 ghc/lib/std/Time.hsc |   54 ++++++++++++++++++++++++++++++++++++++++----------
 mk/config.h.in       |    6 ++++++
 mk/config.mk.in      |    4 ++--
 4 files changed, 52 insertions(+), 14 deletions(-)

diff --git a/configure.in b/configure.in
index a35ad4a..cafba55 100644
--- a/configure.in
+++ b/configure.in
@@ -836,7 +836,7 @@ AC_CHECK_FUNCS(pclose    _pclose )
 
 
 dnl ** check for specific library functions that we are interested in
-AC_CHECK_FUNCS(access ftime getclock getpagesize getrusage gettimeofday mktime mprotect readlink setitimer stat symlink sysconf timelocal times vadvise vfork)
+AC_CHECK_FUNCS(access ftime getclock getpagesize getrusage gettimeofday mktime mprotect readlink setitimer stat symlink sysconf timelocal times vadvise vfork localtime_r gmtime_r)
 
 dnl ** check whether this machine has gmp3 installed
 AC_CHECK_LIB(gmp,  __gmpz_fdiv_qr, HaveLibGmp=YES; LibGmp=gmp,
diff --git a/ghc/lib/std/Time.hsc b/ghc/lib/std/Time.hsc
index 0e77f37..2cbf318 100644
--- a/ghc/lib/std/Time.hsc
+++ b/ghc/lib/std/Time.hsc
@@ -3,7 +3,7 @@
 -- to compile on sparc-solaris.  Blargh.
 
 -- -----------------------------------------------------------------------------
--- $Id: Time.hsc,v 1.17 2001/07/24 04:35:36 ken Exp $
+-- $Id: Time.hsc,v 1.18 2001/07/24 04:39:31 ken Exp $
 --
 -- (c) The University of Glasgow, 1995-2001
 --
@@ -367,18 +367,42 @@ gmtoff x = do
 
 
 toCalendarTime :: ClockTime -> IO CalendarTime
-toCalendarTime =  clockToCalendarTime localtime False
+#if HAVE_LOCALTIME_R
+toCalendarTime =  clockToCalendarTime_reentrant (throwAwayReturnPointer localtime_r) False
+#else
+toCalendarTime =  clockToCalendarTime_static localtime False
+#endif
 
 toUTCTime      :: ClockTime -> CalendarTime
-toUTCTime      =  unsafePerformIO . clockToCalendarTime gmtime True
+#if HAVE_GMTIME_R
+toUTCTime      =  unsafePerformIO . clockToCalendarTime_reentrant (throwAwayReturnPointer gmtime_r) True
+#else
+toUTCTime      =  unsafePerformIO . clockToCalendarTime_static gmtime True
+#endif
 
--- ToDo: should be made thread safe, because localtime uses static storage,
--- or use the localtime_r version.
-clockToCalendarTime :: (Ptr CTime -> IO (Ptr CTm)) -> Bool -> ClockTime
+throwAwayReturnPointer :: (Ptr CTime -> Ptr CTm -> IO (Ptr CTm))
+                       -> (Ptr CTime -> Ptr CTm -> IO (       ))
+throwAwayReturnPointer fun x y = fun x y >> return ()
+
+clockToCalendarTime_static :: (Ptr CTime -> IO (Ptr CTm)) -> Bool -> ClockTime
 	 -> IO CalendarTime
-clockToCalendarTime fun is_utc (TOD secs psec) = do
+clockToCalendarTime_static fun is_utc (TOD secs psec) = do
+  putStrLn ("clockToCalendarTime: TOD " ++ show secs ++ " " ++ show psec)
   withObject (fromIntegral secs :: CTime)  $ \ p_timer -> do
+    case p_timer of Ptr addr -> putStrLn ("const time_t * = " ++ show (I## (addr2Int## addr)))
     p_tm <- fun p_timer 	-- can't fail, according to POSIX
+    clockToCalendarTime_aux is_utc p_tm psec
+
+clockToCalendarTime_reentrant :: (Ptr CTime -> Ptr CTm -> IO ()) -> Bool -> ClockTime
+	 -> IO CalendarTime
+clockToCalendarTime_reentrant fun is_utc (TOD secs psec) = do
+  withObject (fromIntegral secs :: CTime)  $ \ p_timer -> do
+    allocaBytes (#const sizeof(struct tm)) $ \ p_tm -> do
+      fun p_timer p_tm
+      clockToCalendarTime_aux is_utc p_tm psec
+
+clockToCalendarTime_aux :: Bool -> Ptr CTm -> Integer -> IO CalendarTime
+clockToCalendarTime_aux is_utc p_tm psec = do
     sec   <-  (#peek struct tm,tm_sec  ) p_tm :: IO CInt
     min   <-  (#peek struct tm,tm_min  ) p_tm :: IO CInt
     hour  <-  (#peek struct tm,tm_hour ) p_tm :: IO CInt
@@ -593,10 +617,18 @@ formatTimeDiff l fmt td@(TimeDiff year month day hour min sec _)
 
 type CTm = () -- struct tm
 
-foreign import unsafe localtime :: Ptr CTime -> IO (Ptr CTm)
-foreign import unsafe gmtime    :: Ptr CTime -> IO (Ptr CTm)
-foreign import unsafe mktime    :: Ptr CTm   -> IO CTime
-foreign import unsafe time      :: Ptr CTime -> IO CTime
+#if HAVE_LOCALTIME_R
+foreign import unsafe localtime_r :: Ptr CTime -> Ptr CTm -> IO (Ptr CTm)
+#else
+foreign import unsafe localtime   :: Ptr CTime -> IO (Ptr CTm)
+#endif
+#if HAVE_GMTIME_R
+foreign import unsafe gmtime_r    :: Ptr CTime -> Ptr CTm -> IO (Ptr CTm)
+#else
+foreign import unsafe gmtime      :: Ptr CTime -> IO (Ptr CTm)
+#endif
+foreign import unsafe mktime      :: Ptr CTm   -> IO CTime
+foreign import unsafe time        :: Ptr CTime -> IO CTime
 
 #if HAVE_GETTIMEOFDAY
 type CTimeVal = ()
diff --git a/mk/config.h.in b/mk/config.h.in
index d81ca78..f6567d8 100644
--- a/mk/config.h.in
+++ b/mk/config.h.in
@@ -665,6 +665,12 @@
 /* Define if you have the gettimeofday function.  */
 #undef HAVE_GETTIMEOFDAY
 
+/* Define if you have the gmtime_r function.  */
+#undef HAVE_GMTIME_R
+
+/* Define if you have the localtime_r function.  */
+#undef HAVE_LOCALTIME_R
+
 /* Define if you have the macsystem function.  */
 #undef HAVE_MACSYSTEM
 
diff --git a/mk/config.mk.in b/mk/config.mk.in
index 40f5fd1..a0eb257 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -185,8 +185,8 @@ GhcUnregisterised=NO
 # (as well as a C backend)
 #
 # Target platforms supported:
-#   i386, alpha & sparc
-ifneq "$(findstring $(HostArch_CPP), i386 alpha sparc)" ""
+#   i386 & sparc
+ifneq "$(findstring $(HostArch_CPP), i386 sparc)" ""
 GhcWithNativeCodeGen=YES
 else
 GhcWithNativeCodeGen=NO
-- 
1.7.10.4