Changeset 31404 in webkit for trunk/JavaScriptCore/wtf/Threading.h

Timestamp:

Mar 28, 2008, 1:21:39 PM (17 years ago)

Author:

[email protected]

Message:

Reviewed by Sam Weinig.

Fix a dtoa thread safety issue.

WebCore can call kjs_strtod without holding JS lock, but we didn't have thread safety
compiled in for dtoa.

This is a 0.5% regression on SunSpider, which Sam Weinig has volunteered to cover with
his recent improvement.

• kjs/dtoa.cpp: (Bigint::Balloc): (Bigint::Bfree): Changed to use fastMalloc/fastDelete - they are much faster than the dtoa custom version was in the presence of locking (but somewhat slower in single-threaded case). (Bigint::pow5mult): Got rid of the dreaded double-checked locking anti-pattern (had to restructure the code to avoid significant performance implications). (Bigint::lshift): Rewrote to avoid an allocation, if possible.

(Bigint::rv_alloc):
(Bigint::kjs_freedtoa):
(Bigint::kjs_dtoa):
Check for USE(MULTIPLE_THREADS), not dtoa legacy MULTIPLE_THREADS.

• kjs/InitializeThreading.cpp: Added. (KJS::initializeThreading):
• kjs/InitializeThreading.h: Added. Initialize threading at KJS level, if enabled.

• kjs/dtoa.h: Expose dtoa mutex for KJS::initializeThreading.

• kjs/testkjs.cpp: (kjsmain): Call initializeThreading.

• JavaScriptCore.exp: Export KJS::initializeThreading.

• GNUmakefile.am:
• JavaScriptCore.exp:
• JavaScriptCore.pri:
• JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj:
• JavaScriptCoreSources.bkl:
• JavaScriptCore.xcodeproj/project.pbxproj: Added InitializeThreading.{h,cpp}.

• wtf/Threading.h: Removed a using directive for WTF::initializeThreading - it is only to be called from KJS::initializeThreading, and having it in the global namespace is useless.

File:

• trunk/JavaScriptCore/wtf/Threading.h (modified) (1 diff)

trunk/JavaScriptCore/wtf/Threading.h

@@ -262 +262 @@
 using WTF::currentThread;
 using WTF::detachThread;
-using WTF::initializeThreading;
 using WTF::waitForThreadCompletion;