From bac394c4956281bcd5b4f653a152c659b3f5bb9c Mon Sep 17 00:00:00 2001
From: Leon Arber <larber@ncsa.uiuc.edu>
Date: Thu, 16 Mar 2006 16:35:32 -0500
Subject: [svn-r12110] Purpose: Optimization

Description:
Get rid of unnecessary function call for systems that don't have rand_r.

Solution:
If rand_r isn't present on a system, then macros can be used to simply call
the underlying random function instead of calling the HDrand/HDsrand functions
that keep track of the random seed within the library.


Platforms tested:
heping (minor change)

Misc. update:
---
 src/H5.c        | 21 ++++++---------------
 src/H5private.h | 18 +++++++++++++++++-
 2 files changed, 23 insertions(+), 16 deletions(-)

diff --git a/src/H5.c b/src/H5.c
index 724ea35..9988414 100644
--- a/src/H5.c
+++ b/src/H5.c
@@ -3119,12 +3119,11 @@ H5_trace (const double *returning, const char *func, const char *type, ...)
  * Function:	HDrand/HDsrand
  *
  * Purpose:	Wrapper function for rand.  If rand_r exists on this system,
- * 		use it.  Otherwise, just call random() or rand().
+ * 		use it. 
  *
  * 		Wrapper function for srand.  If rand_r is available, it will keep
  * 		track of the seed locally instead of using srand() which modifies
- * 		global state and can break other programs.  Otherwise, just call
- * 		srandom() or srand().
+ * 		global state and can break other programs. 
  *
  * Return:	Success:	Random number from 0 to RAND_MAX
  *
@@ -3136,26 +3135,18 @@ H5_trace (const double *returning, const char *func, const char *type, ...)
  * Modifications:
  *-------------------------------------------------------------------------
  */
+#ifdef H5_HAVE_RAND_R
+
 static unsigned int g_seed = 42;
 
 int HDrand(void)
 {
-#ifdef H5_HAVE_RAND_R
     return rand_r(&g_seed);
-#elif H5_HAVE_RANDOM
-    return random();
-#else
-    return rand();
-#endif
 }
 
 void HDsrand(unsigned int seed)
 {
-#ifdef H5_HAVE_RAND_R
     g_seed = seed; 
-#elif H5_HAVE_RANDOM
-    srandom(seed);
-#else
-    srand(seed);
-#endif
 }
+
+#endif
diff --git a/src/H5private.h b/src/H5private.h
index 96e91eb..b89967d 100644
--- a/src/H5private.h
+++ b/src/H5private.h
@@ -773,8 +773,24 @@ typedef off_t                   h5_stat_size_t;
 #define HDputs(S)		puts(S)
 #define HDqsort(M,N,Z,F)	qsort(M,N,Z,F)
 #define HDraise(N)		raise(N)
-H5_DLL int HDrand(void);
+
+#ifdef H5_HAVE_RAND_R
 #define HDrandom()		HDrand()
+#define HDsrandom(S)		HDsrand(S)
+H5_DLL int HDrand();
+H5_DLL void HDsrand(unsigned int seed);
+#elif H5_HAVE_RANDOM
+#define HDrand()		random()
+#define HDrandom()		random()
+#define HDsrandom(S)		srandom(S)
+#define HDsrand(S)		srandom(S)
+#else
+#define HDrand()		rand()
+#define HDrandom()		rand()
+#define HDsrandom(S)		srand(S)
+#define HDsrand(S)		srand(S)
+#endif
+
 #define HDread(F,M,Z)		read(F,M,Z)
 #define HDreaddir(D)		readdir(D)
 #define HDrealloc(M,Z)		realloc(M,Z)
-- 
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