Merge branch 'upstream-libuv' into import-libuv

* upstream-libuv:
  libuv 2016-08-30 (897738b1)

1 files changed, 88 insertions, 0 deletions

diff --git a/Utilities/cmlibuv/src/unix/atomic-ops.h b/Utilities/cmlibuv/src/unix/atomic-ops.h
new file mode 100644
index 0000000..815e355
--- /dev/null
+++ b/Utilities/cmlibuv/src/unix/atomic-ops.h
@@ -0,0 +1,88 @@
+/* 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;
+#elif defined(__MVS__)
+  return __plo_CS(ptr, (unsigned int*) ptr,
+                  oldval, (unsigned int*) &newval);
+#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;
+#elif defined (__MVS__)
+# ifdef _LP64
+  return __plo_CSGR(ptr, (unsigned long long*) ptr,
+                    oldval, (unsigned long long*) &newval);
+# else
+  return __plo_CS(ptr, (unsigned int*) ptr,
+                  oldval, (unsigned int*) &newval);
+# endif
+#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_ */