Android: implement rand_r()

stdlib.h doesn't implement rand_r() on Android.

Signed-off-by: Charles Briere <charlesbriere.flatzo@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/Makefile.am b/Makefile.am
index d169ef0653bdfd593af11f4da707ef50026f9b4d..938027c0c6ec20a36f9ebdad85783cc0c3bd2293 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,6 +23,7 @@ nobase_dist_include_HEADERS = urcu/compiler.h urcu/hlist.h urcu/list.h \
                urcu/lfstack.h urcu/syscall-compat.h \
                $(top_srcdir)/urcu/map/*.h \
                $(top_srcdir)/urcu/static/*.h \
+               urcu/rand-compat.h \
                urcu/tls-compat.h
 nobase_nodist_include_HEADERS = urcu/arch.h urcu/uatomic.h urcu/config.h
 

diff --git a/tests/benchmark/test_urcu_hash.h b/tests/benchmark/test_urcu_hash.h
index c0727b7ba9898d92d14a51c103a0f95389fa9b55..b35acdb88330d41c8ff2f73307730c181443bc32 100644 (file)
--- a/tests/benchmark/test_urcu_hash.h
+++ b/tests/benchmark/test_urcu_hash.h
@@ -37,6 +37,7 @@
 #include <signal.h>
 
 #include <urcu/tls-compat.h>
+#include <urcu/rand-compat.h>
 #include "cpuset.h"
 #include "thread-id.h"
 

diff --git a/urcu/rand-compat.h b/urcu/rand-compat.h
new file mode 100644 (file)
index 0000000..2c57751
--- /dev/null
+++ b/urcu/rand-compat.h
@@ -0,0 +1,63 @@
+#ifndef _URCU_RAND_COMPAT_H
+#define _URCU_RAND_COMPAT_H
+
+/*
+ * urcu/rand-compat.h
+ *
+ * Userspace RCU library - rand/rand_r Compatibility Header
+ *
+ * Copyright 1996 - Ulrich Drepper <drepper@cygnus.com >
+ * Copyright 2013 - Pierre-Luc St-Charles <pierre-luc.st-charles@polymtl.ca>
+ *
+ * Note: this file is only used to simplify the code required to
+ * use the 'rand_r(...)' system function across multiple platforms,
+ * which might not always be referenced the same way.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifdef __ANDROID__
+/*
+ * Reentrant random function from POSIX.1c.
+ * Copyright (C) 1996, 1999 Free Software Foundation, Inc.
+ * This file is part of the GNU C Library.
+ * Contributed by Ulrich Drepper <drepper@cygnus.com <mailto:drepper@cygnus.com>>, 1996.
+ */
+static inline int rand_r(unsigned int *seed)
+{
+       unsigned int next = *seed;
+       int result;
+
+       next *= 1103515245;
+       next += 12345;
+       result = (unsigned int) (next / 65536) % 2048;
+
+       next *= 1103515245;
+       next += 12345;
+       result <<= 10;
+       result ^= (unsigned int) (next / 65536) % 1024;
+
+       next *= 1103515245;
+       next += 12345;
+       result <<= 10;
+       result ^= (unsigned int) (next / 65536) % 1024;
+
+       *seed = next;
+
+       return result;
+}
+#endif /* __ANDROID__ */
+
+#endif /* _URCU_RAND_COMPAT_H */

diff --git a/urcu/static/urcu.h b/urcu/static/urcu.h
index 53d2610a6f775651db01f6dec2ab22f1cc9d17ed..33545b71f68c1be9dc25ef78a59a9a052d16aca5 100644 (file)
--- a/urcu/static/urcu.h
+++ b/urcu/static/urcu.h
@@ -41,6 +41,7 @@
 #include <urcu/list.h>
 #include <urcu/futex.h>
 #include <urcu/tls-compat.h>
+#include <urcu/rand-compat.h>
 
 #ifdef __cplusplus
 extern "C" {