Bug 156757

Summary:	Consider more alternative locking protocols for WTF::Lock
Product:	WebKit	Reporter:	Filip Pizlo <fpizlo>
Component:	Web Template Framework	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	ggaren
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	All
OS:	All

Description Filip Pizlo 2016-04-19 12:16:25 PDT

The current protocol errs on the side of fairness by having the slow path release the lock while the queue lock is held.  This reduces barging opportunities.

We should consider other futex-based protocols.  For example, it might be interesting to see how Linux's pthread_mutex_lock algorithm would work in WTF::Lock.