Author: ed
Date: Thu May 30 06:20:50 2013
New Revision: 251124
URL: http://svnweb.freebsd.org/changeset/base/251124
Log:
Add __sync_synchronize().
This function can easily be implemented on top of the mb() macro
provided by <machine/atomic.h>.
Added:
head/lib/libcompiler_rt/__sync_synchronize.c (contents, props changed)
Modified:
head/lib/libcompiler_rt/Makefile
Modified: head/lib/libcompiler_rt/Makefile
==============================================================================
--- head/lib/libcompiler_rt/Makefile Thu May 30 06:20:23 2013
(r251123)
+++ head/lib/libcompiler_rt/Makefile Thu May 30 06:20:50 2013
(r251124)
@@ -164,6 +164,7 @@ SRCF+= __sync_fetch_and_add_4 \
__sync_fetch_and_sub_4 \
__sync_fetch_and_xor_4 \
__sync_lock_test_and_set_4 \
+ __sync_synchronize \
__sync_val_compare_and_swap_4
.endif
.if ${MACHINE_ARCH:Mmips64*} != ""
Added: head/lib/libcompiler_rt/__sync_synchronize.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/lib/libcompiler_rt/__sync_synchronize.c Thu May 30 06:20:50
2013 (r251124)
@@ -0,0 +1,47 @@
+/*-
+ * Copyright (c) 2013 Ed Schouten <e...@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <machine/atomic.h>
+
+#ifdef __clang__
+static void
+atomic_func(void)
+#else
+void
+__sync_synchronize(void)
+#endif
+{
+
+ mb();
+}
+
+#ifdef __clang__
+__strong_reference(atomic_func, __sync_synchronize);
+#endif
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