How can we start a real thread in gecko using javascript and use XPCOM
in it?
Is dispatching events to /nsIStreamTransportService/ or
/nsIThreadManager.newThread(0) /the right way?
--
Best regards,
??(Ray You)
-------- Original Message --------
Message-ID: <50d1787d.8010...@mozilla.com>
Date: Wed, 19 Dec 2012 16:19:09 +0800
From: Ray You <r...@mozilla.com>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0)
Gecko/17.0 Thunderbird/17.0
MIME-Version: 1.0
To: doug.tur...@gmail.com
Subject: A question about multithreading in gecko using javascript
Content-Type: multipart/alternative;
boundary="------------060401050602000000060705"
Hi Doug,
I've read you DeviceStorage patch code, and believe that it really uses
two threads, thus is really asynchronous, which means it would not be
blocked by heavy IO operation. Plus it uses XPCOM components on another
thread.
I believe the following code starts a new thread:
https://mxr.mozilla.org/mozilla-central/source/dom/devicestorage/nsDeviceStorage.cpp#1121
nsCOMPtr<nsIEventTarget
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=nsIEventTarget>>target
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=target> =do_GetService
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=do_GetService>(NS_STREAMTRANSPORTSERVICE_CONTRACTID
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=NS_STREAMTRANSPORTSERVICE_CONTRACTID>);
NS_ASSERTION
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=NS_ASSERTION>(target,"Must
have stream transport service");
nsCOMPtr<InitCursorEvent
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=InitCursorEvent>>event
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=event> =new InitCursorEvent
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=InitCursorEvent>(this,mFile
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=mFile>);
target <http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=target>->Dispatch(
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=>event
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=event>,NS_DISPATCH_NORMAL
<http://dxr.mozilla.org/search.cgi?tree=mozilla-central&string=NS_DISPATCH_NORMAL>);
However javascript version of this code is not working: Dispatching the
event to /nsIThreadManager.currentThread///mainThread/ works, while
dispatching it to /nsIStreamTransportService/ or
/nsIThreadManager.newThread(0) /does not.
Is there anything missing? Could we really start a new thread and use
XPCOM components in it using js?
I've been stuck on this for a while and have read mdn and mozwiki on
threads. I also learn that we can't access XPCOM components in chrome
worker. Your help would be greatly appreciated.
--
Best regards,
??(Ray You)
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