import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

ipc/glue/SharedMemoryBasic_mach.h

@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ipc_SharedMemoryBasic_mach_h
+#define mozilla_ipc_SharedMemoryBasic_mach_h
+
+#include "base/file_descriptor_posix.h"
+#include "base/process.h"
+
+#include "SharedMemory.h"
+#include <mach/port.h>
+
+//
+// This is a low-level wrapper around platform shared memory.  Don't
+// use it directly; use Shmem allocated through IPDL interfaces.
+//
+
+class MachPortSender;
+class ReceivePort;
+
+namespace mozilla {
+namespace ipc {
+
+class SharedMemoryBasic final : public SharedMemoryCommon<mach_port_t>
+{
+public:
+  static void SetupMachMemory(pid_t pid,
+                              ReceivePort* listen_port,
+                              MachPortSender* listen_port_ack,
+                              MachPortSender* send_port,
+                              ReceivePort* send_port_ack,
+                              bool pidIsParent);
+
+  static void CleanupForPid(pid_t pid);
+
+  static void Shutdown();
+
+  SharedMemoryBasic();
+
+  virtual bool SetHandle(const Handle& aHandle) override;
+
+  virtual bool Create(size_t aNbytes) override;
+
+  virtual bool Map(size_t nBytes) override;
+
+  virtual void CloseHandle() override;
+
+  virtual void* memory() const override
+  {
+    return mMemory;
+  }
+
+  virtual SharedMemoryType Type() const override
+  {
+    return TYPE_BASIC;
+  }
+
+  static Handle NULLHandle()
+  {
+    return Handle();
+  }
+
+
+  virtual bool IsHandleValid(const Handle &aHandle) const override;
+
+  virtual bool ShareToProcess(base::ProcessId aProcessId,
+                              Handle* aNewHandle) override;
+
+private:
+  ~SharedMemoryBasic();
+
+  void Unmap();
+  mach_port_t mPort;
+  // Pointer to mapped region, null if unmapped.
+  void *mMemory;
+};
+
+} // namespace ipc
+} // namespace mozilla
+
+#endif // ifndef mozilla_ipc_SharedMemoryBasic_mach_h