1 files changed, 94 insertions, 0 deletions
diff --git a/include/grpc/support/atm_win32.h b/include/grpc/support/atm_win32.h
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+++ b/include/grpc/support/atm_win32.h
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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.
+ *
+ */
+
+#ifndef __GRPC_SUPPORT_ATM_WIN32_H__
+#define __GRPC_SUPPORT_ATM_WIN32_H__
+
+/* Win32 variant of atm_platform.h */
+#include <grpc/support/port_platform.h>
+
+#include <windows.h>
+
+typedef gpr_intptr gpr_atm;
+
+#define gpr_atm_full_barrier MemoryBarrier
+
+static __inline gpr_atm gpr_atm_acq_load(const gpr_atm *p) {
+  gpr_atm result = *p;
+  gpr_atm_full_barrier();
+  return result;
+}
+
+static __inline void gpr_atm_rel_store(gpr_atm *p, gpr_atm value) {
+  gpr_atm_full_barrier();
+  *p = value;
+}
+
+static __inline int gpr_atm_no_barrier_cas(gpr_atm *p, gpr_atm o, gpr_atm n) {
+  /* InterlockedCompareExchangePointerNoFence() not available on vista or
+     windows7 */
+  return o == (gpr_atm)InterlockedCompareExchangePointerAcquire(p, (void *)n,
+                                                                (void *)o);
+}
+
+static __inline int gpr_atm_acq_cas(gpr_atm *p, gpr_atm o, gpr_atm n) {
+  return o == (gpr_atm)InterlockedCompareExchangePointerAcquire(p, (void *)n,
+                                                                (void *)o);
+}
+
+static __inline int gpr_atm_rel_cas(gpr_atm *p, gpr_atm o, gpr_atm n) {
+  return o == (gpr_atm)InterlockedCompareExchangePointerRelease(p, (void *)n,
+                                                                (void *)o);
+}
+
+static __inline gpr_atm gpr_atm_no_barrier_fetch_add(gpr_atm *p,
+                                                     gpr_atm delta) {
+  /* Use the CAS operation to get pointer-sized fetch and add */
+  gpr_atm old;
+  do {
+    old = *p;
+  } while (!gpr_atm_no_barrier_cas(p, old, old + delta));
+  return old;
+}
+
+static __inline gpr_atm gpr_atm_full_fetch_add(gpr_atm *p, gpr_atm delta) {
+  /* Use a CAS operation to get pointer-sized fetch and add */
+  gpr_atm old;
+  do {
+    old = *p;
+  } while (old != (gpr_atm)InterlockedCompareExchangePointer(
+                      p, (void *)(old + delta), (void *)old));
+  return old;
+}
+
+#endif  /* __GRPC_SUPPORT_ATM_WIN32_H__ */