On Wed, Jun 10, 2009 at 10:19 PM, Meryl Silverburgh < silverburgh.me...@gmail.com> wrote:
> On Wed, Jun 10, 2009 at 12:18 PM, John Abd-El-Malek<j...@chromium.org> > wrote: > > > > > > On Wed, Jun 10, 2009 at 11:48 AM, Meryl Silverburgh > > <silverburgh.me...@gmail.com> wrote: > >> > >> From this document, it talks about Messaging between > >> > >> > http://dev.chromium.org/developers/design-documents/displaying-a-web-page-in-chrome > >> > >> Can you please help me understand what is the Message Flow for an Alert > >> Dialog? > >> > >> like in this case: > >> <html><script> function f1() { var a = 1; alert("hello"); a = 2;}; > >> f1(); </script></html> > >> > >> I assume it is like this, please correct me if i am wrong: > >> 1. Browser Process downloads the test page > >> 2. Renderer Process gets the html source, parses the html and have v8 > >> executes script node > >> 3. v8 pauses at 'alert' call, sends a message to Browser Process to > >> pop up the alert dialog and Render Process blocked till it receives > >> message from Browser. > >> 4. Browser Process shows the alert dialog with the right message (in > >> this case 'hello') > >> 5. When user clicks 'Okay', browser process sends a message back to > >> Renderer Process and v8 continues execute the rest of the Script node. > >> > >> Is this correct? > > > > Yep this is pretty much what happens. For more details, search > > for ViewHostMsg_RunJavaScriptMessage > > > > Thank you. John. > > I think this method is Render process to send a message to Browser > process to pop up an alert dialog. > bool RenderView::RunJavaScriptMessage(int type, > const std::wstring& message, > const std::wstring& default_value, > const GURL& frame_url, > std::wstring* result) > > that calls: > bool Channel::Send(Message* message); > and then > bool Channel::ChannelImpl::ProcessOutgoingMessages() > > My question is how the Render process being blocked after it sends the > message to Browser process, which one is a blocking calls or which one > calls a blocking method? > And how it will resume when Browser process replys a message? How > Render is being resumed (which method does that)? This is done automatically since ViewHostMsg_RunJavaScriptMessage is declared as a synchronous IPC message (see render_messages_internal.h). The code that does the waiting until the browser replies is IPC::SyncChannel. See Send() in ipc_sync_channel.cc. > > > Thank you. > > > >> > >> Thank you for any clarificaiton. > >> > >> > >> > > > > > --~--~---------~--~----~------------~-------~--~----~ Chromium Developers mailing list: chromium-dev@googlegroups.com View archives, change email options, or unsubscribe: http://groups.google.com/group/chromium-dev -~----------~----~----~----~------~----~------~--~---
