summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/libuv/src/unix/atomic-ops.h
diff options
context:
space:
mode:
author ImJezze <jezze@gmx.net>2016-02-21 11:48:45 +0100
committer ImJezze <jezze@gmx.net>2016-02-21 11:48:45 +0100
commitcc24a339d8c0517259084b5c178d784626ba965c (patch)
tree9868e9687b5802ae0a3733712a3bbeb3bc75c953 /3rdparty/libuv/src/unix/atomic-ops.h
parentb5daabda5495dea5c50e17961ecfed2ea8619d76 (diff)
Merge remote-tracking branch 'refs/remotes/mamedev/master'
Second attempt
Diffstat (limited to '3rdparty/libuv/src/unix/atomic-ops.h')
-rw-r--r--3rdparty/libuv/src/unix/atomic-ops.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/3rdparty/libuv/src/unix/atomic-ops.h b/3rdparty/libuv/src/unix/atomic-ops.h
new file mode 100644
index 00000000000..84e471838be
--- /dev/null
+++ b/3rdparty/libuv/src/unix/atomic-ops.h
@@ -0,0 +1,77 @@
+/* Copyright (c) 2013, Ben Noordhuis <info@bnoordhuis.nl>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef UV_ATOMIC_OPS_H_
+#define UV_ATOMIC_OPS_H_
+
+#include "internal.h" /* UV_UNUSED */
+
+#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+#include <atomic.h>
+#define __sync_val_compare_and_swap(p, o, n) atomic_cas_ptr(p, o, n)
+#endif
+
+UV_UNUSED(static int cmpxchgi(int* ptr, int oldval, int newval));
+UV_UNUSED(static long cmpxchgl(long* ptr, long oldval, long newval));
+UV_UNUSED(static void cpu_relax(void));
+
+/* Prefer hand-rolled assembly over the gcc builtins because the latter also
+ * issue full memory barriers.
+ */
+UV_UNUSED(static int cmpxchgi(int* ptr, int oldval, int newval)) {
+#if defined(__i386__) || defined(__x86_64__)
+ int out;
+ __asm__ __volatile__ ("lock; cmpxchg %2, %1;"
+ : "=a" (out), "+m" (*(volatile int*) ptr)
+ : "r" (newval), "0" (oldval)
+ : "memory");
+ return out;
+#elif defined(_AIX) && defined(__xlC__)
+ const int out = (*(volatile int*) ptr);
+ __compare_and_swap(ptr, &oldval, newval);
+ return out;
+#else
+ return __sync_val_compare_and_swap(ptr, oldval, newval);
+#endif
+}
+
+UV_UNUSED(static long cmpxchgl(long* ptr, long oldval, long newval)) {
+#if defined(__i386__) || defined(__x86_64__)
+ long out;
+ __asm__ __volatile__ ("lock; cmpxchg %2, %1;"
+ : "=a" (out), "+m" (*(volatile long*) ptr)
+ : "r" (newval), "0" (oldval)
+ : "memory");
+ return out;
+#elif defined(_AIX) && defined(__xlC__)
+ const long out = (*(volatile int*) ptr);
+# if defined(__64BIT__)
+ __compare_and_swaplp(ptr, &oldval, newval);
+# else
+ __compare_and_swap(ptr, &oldval, newval);
+# endif /* if defined(__64BIT__) */
+ return out;
+#else
+ return __sync_val_compare_and_swap(ptr, oldval, newval);
+#endif
+}
+
+UV_UNUSED(static void cpu_relax(void)) {
+#if defined(__i386__) || defined(__x86_64__)
+ __asm__ __volatile__ ("rep; nop"); /* a.k.a. PAUSE */
+#endif
+}
+
+#endif /* UV_ATOMIC_OPS_H_ */