1. Can we call XPCOM in js-ctype code?
2. What about this code in DeviceStorage implementation?
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>);
I notice that there are assertions on both /NS_IsMainThread()/ and
/!NS_IsMainThread()/. Seems like it really starts a backstage thread in
DeviceStorage implementation. Is this true?/
/
--
Best regards,
??(Ray You)
On 12/20/12 7:35 PM, David Rajchenbach-Teller wrote:
On 12/20/12 7:27 AM, Ray You wrote:
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?
I don't think this is supported anymore. As far as I can tell, if you
truly need to call XPCOM from JS in a background thread, you need to do
the following:
- write extern "C" code that calls into XPCOM;
- launch a Chrome Worker from JS;
- link JS to your C shared lib through js-ctypes;
- call your C code from JS through js-ctypes.
Cheers,
David
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