[Mac] Replace the existing browser-child mach ipc with a long-lived listener ...

base/mach_ipc_mac.mm

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/mach_ipc_mac.h"
 
 #import <Foundation/Foundation.h>
 
 #include <stdio.h>
 #include "base/logging.h"
@@ skipping 180 matching lines @@
     return;
 
   init_result_ = mach_port_insert_right(current_task,
                                         port_,
                                         port_,
                                         MACH_MSG_TYPE_MAKE_SEND);
 
   if (init_result_ != KERN_SUCCESS)
     return;
 
-  NSPort *ns_port = [NSMachPort portWithMachPort:port_];
+  // Without |NSMachPortDeallocateNone|, the NSMachPort seems to deallocate
+  // receive rights on port when it is eventually released.  It is not necessary
+  // to deallocate any rights here as |port_| is fully deallocated in the
+  // ReceivePort destructor.
+  NSPort *ns_port = [NSMachPort portWithMachPort:port_
+                                         options:NSMachPortDeallocateNone];
   NSString *port_name = [NSString stringWithUTF8String:receive_port_name];
   [[NSMachBootstrapServer sharedInstance] registerPort:ns_port name:port_name];
 }
 
 //==============================================================================
 // create a new mach port for receiving messages
 ReceivePort::ReceivePort() {
   mach_port_t current_task = mach_task_self();
 
   init_result_ = mach_port_allocate(current_task,
@@ skipping 33 matching lines @@
   // return any error condition encountered in constructor
   if (init_result_ != KERN_SUCCESS)
     return init_result_;
 
   out_message->Head()->msgh_bits = 0;
   out_message->Head()->msgh_local_port = port_;
   out_message->Head()->msgh_remote_port = MACH_PORT_NULL;
   out_message->Head()->msgh_reserved = 0;
   out_message->Head()->msgh_id = 0;
 
+  mach_msg_option_t rcv_options = MACH_RCV_MSG;
+  if (timeout != MACH_MSG_TIMEOUT_NONE)
+    rcv_options |= MACH_RCV_TIMEOUT;
+
   kern_return_t result = mach_msg(out_message->Head(),
-                                  MACH_RCV_MSG | MACH_RCV_TIMEOUT,
+                                  rcv_options,
                                   0,
                                   out_message->MaxSize(),
                                   port_,
                                   timeout,              // timeout in ms
                                   MACH_PORT_NULL);
 
   return result;
 }
 
 #pragma mark -
@@ skipping 36 matching lines @@
                                   message.Head()->msgh_size,
                                   0,
                                   MACH_PORT_NULL,
                                   timeout,              // timeout in ms
                                   MACH_PORT_NULL);
 
   return result;
 }
 
 }  // namespace base