Launch processes asynchronously so as not to block the UI thread. For now, re...

chrome/browser/child_process_launcher.cc

 // Copyright (c) 2009 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 "chrome/browser/child_process_launcher.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/scoped_ptr.h"
@@ skipping 55 matching lines @@
  private:
   friend class base::RefCountedThreadSafe<ChildProcessLauncher::Context>;
   friend class ChildProcessLauncher;
 
   ~Context() {
     Terminate();
   }
 
   void LaunchInternal(int ipcfd, CommandLine* cmd_line) {
     scoped_ptr<CommandLine> cmd_line_deleter(cmd_line);
-    base::ProcessHandle handle;
+    base::ProcessHandle handle = base::kNullProcessHandle;
     bool zygote = false;
 #if defined(OS_WIN)
     handle = sandbox::StartProcess(cmd_line);
 #elif defined(OS_POSIX)
 
 #if defined(OS_LINUX)
     // On Linux, normally spawn processes with zygotes. We can't do this when
     // we're spawning child processes through an external program (i.e. there is
     // a command prefix) like GDB so fall through to the POSIX case then.
     if (!CommandLine::ForCurrentProcess()->HasSwitch(
@@ skipping 25 matching lines @@
         fds_to_map.push_back(std::make_pair(crash_signal_fd,
                                             kCrashDumpSignal + 3));
       }
       const int sandbox_fd =
           Singleton<RenderSandboxHostLinux>()->GetRendererSocket();
       fds_to_map.push_back(std::make_pair(sandbox_fd, kSandboxIPCChannel + 3));
 #endif  // defined(OS_LINUX)
 
       // Actually launch the app.
       if (!base::LaunchApp(cmd_line->argv(), fds_to_map, false, &handle))
-        handle = 0;
+        handle = base::kNullProcessHandle;
     }
 #endif
 
     ChromeThread::PostTask(
         client_thread_id_, FROM_HERE,
         NewRunnableMethod(
             this, &ChildProcessLauncher::Context::Notify, handle, zygote));
   }
 
   void Notify(base::ProcessHandle handle, bool zygote) {
@@ skipping 96 matching lines @@
   if (child_exited)
     context_->process_.Close();
 
   return did_crash;
 }
 
 void ChildProcessLauncher::SetProcessBackgrounded(bool background) {
   DCHECK(!context_->starting_);
   context_->process_.SetProcessBackgrounded(background);
 }