Get service processes working on Mac and Linux.

chrome/common/service_process_util.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_COMMON_SERVICE_PROCESS_UTIL_H_
 #define CHROME_COMMON_SERVICE_PROCESS_UTIL_H_
 
 #include <string>
 
 #include "base/process.h"
 #include "base/scoped_ptr.h"
 #include "base/shared_memory.h"
-#include "base/task.h"
+
+class Task;
+class MessageLoop;
 
 template <typename T> struct DefaultSingletonTraits;
 
 // Return the IPC channel to connect to the service process.
 //
 std::string GetServiceProcessChannelName();
 
 // Return a name that is scoped to this instance of the service process. We
 // use the user-data-dir as a scoping prefix.
 std::string GetServiceProcessScopedName(const std::string& append_str);
 
 // Return a name that is scoped to this instance of the service process. We
 // use the user-data-dir and the version as a scoping prefix.
 std::string GetServiceProcessScopedVersionedName(const std::string& append_str);
 
 // The following methods are used in a process that acts as a client to the
 // service process (typically the browser process).
 // --------------------------------------------------------------------------
 // This method checks that if the service process is ready to receive
 // IPC commands.
 bool CheckServiceProcessReady();
 
-// Returns the process id of the currently running service process. Returns 0
-// if no service process is running.
+// Returns the process id and version of the currently running service process.
 // Note: DO NOT use this check whether the service process is ready because
-// a non-zero return value only means that the process is running and not that
-// it is ready to receive IPC commands. This method is only exposed for testing.
-base::ProcessId GetServiceProcessPid();
+// a true return value only means that some process shared data was available,
+// and not that the process is ready to receive IPC commands, or even running.
+// This method is only exposed for testing.
+bool GetServiceProcessSharedData(std::string* version, base::ProcessId* pid);
 // --------------------------------------------------------------------------
 
 // Forces a service process matching the specified version to shut down.
-bool ForceServiceProcessShutdown(const std::string& version);
+bool ForceServiceProcessShutdown(const std::string& version,
+                                 base::ProcessId process_id);
 
 // This is a class that is used by the service process to signal events and
 // share data with external clients. This class lives in this file because the
 // internal data structures and mechanisms used by the utility methods above
 // and this class are shared.
 class ServiceProcessState {
  public:
   // Returns the singleton instance.
   static ServiceProcessState* GetInstance();
 
   // Tries to become the sole service process for the current user data dir.
   // Returns false if another service process is already running.
   bool Initialize();
 
   // Signal that the service process is ready.
   // This method is called when the service process is running and initialized.
   // |shutdown_task| is invoked when we get a shutdown request from another
   // process (in the same thread that called SignalReady). It can be NULL.
-  void SignalReady(Task* shutdown_task);
+  // |message_loop| must be of type IO and is the loop that POSIX uses
+  // to monitor the service process.
+  bool SignalReady(MessageLoop *message_loop, Task* shutdown_task);
 
   // Signal that the service process is stopped.
   void SignalStopped();
 
   // Register the service process to run on startup.
   bool AddToAutoRun();
 
   // Unregister the service process to run on startup.
   bool RemoveFromAutoRun();
 
@@ skipping 11 matching lines @@
   // Acquires a singleton lock for the service process. A return value of false
   // means that a service process instance is already running.
   bool TakeSingletonLock();
 
   // Key used to register the service process to auto-run.
   std::string GetAutoRunKey();
 
   // Tear down the platform specific state.
   void TearDownState();
 
-  // Allows each platform to specify whether it supports killing older versions.
-  bool ShouldHandleOtherVersion();
   // An opaque object that maintains state. The actual definition of this is
   // platform dependent.
   struct StateData;
   StateData* state_;
   scoped_ptr<base::SharedMemory> shared_mem_service_data_;
 
   friend struct DefaultSingletonTraits<ServiceProcessState>;
 };
 
 #endif  // CHROME_COMMON_SERVICE_PROCESS_UTIL_H_