[webkit-dev] Single-threaded database/storage solution

laszlo.1.gombos at nokia.com laszlo.1.gombos at nokia.com
Tue Aug 18 12:57:33 PDT 2009

Hi All,

QtWebKit has a build time flag called ENABLE_SINGLE_THREADED to turn off ENABLE_JSC_MULTIPLE_THREADS and WebCore features that create additional threads. I'm interested to make this feature available for QtWebKit (and maybe other ports) as well, not just to the WINCE port. See http://trac.webkit.org/changeset/44411.


-----Original Message-----
From: webkit-dev-bounces at lists.webkit.org 
[mailto:webkit-dev-bounces at lists.webkit.org] On Behalf Of ext 
George Staikos
Sent: Tuesday, August 18, 2009 10:36 PM
To: WebKit Development
Subject: Re: [webkit-dev] Single-threaded database/storage solution

On 18-Aug-09, at 1:44 PM, Yong Li wrote:

> Hi, All,
> The current webkit database/storage is implemented with creating new 
> threads. But not all platform/products support mulple- threading. 
> Also, threading can be expensive on some platforms.
> Except this database/storage implementation, WEBKIT platform- 
> code can build and run in a single thread. WEBKIT generally uses 
> WebCore::Timer To avoid blocking UI. Another way to avoid blocking UI 
> is to create a separate thread for UI, and WEBKIT code can still run 
> in a single-thread. Now it's broken by database/ storage code, which 
> forces to use multiple threads for WEBKIT. In our WINCE port, we have 
> implemented a single-threaded solution with WebCore::Timer. The patch 
> has been post to https://bugs.webkit.org/
> show_bug.cgi?id=28019 . The patch is a bit out-of-date, due 
to changes 
> in upstream. New patch will come soon. Please give some comments if 
> you're interested.
> There's a macro ENABLE_JSC_MULTIPLE_THREADS used in JSC. Probably 
> there should also be a macro ENABLE_WEBCORE_MULTIPLE_THREADS. Or just 
> use ENABLE_MULTIPLE_THREADS for all multi-threading code.

   I agree with that and I think a cleanup of the patch would 
make it a good addition.  Forcing the use of threads here is not ideal.

George Staikos
Torch Mobile Inc.

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