![]() | |||||||||||||
Messages in this thread |
On Wed, 2005-10-26 at 01:43 +0200, Andi Kleen wrote: > Alan Stern <stern@rowland.harvard.edu> writes: > > > Has anyone been bothered by the fact that notifier chains are not safe > > with regard to registration and unregistration while the chain is in use? > > The notifier_chain_register and notifier_chain_unregister routines have > > writelock protections, but the corresponding readlock is never taken! > > If you add locks to the reader make sure it is only taken > if the list is non empty. Otherwise you will add unacceptable > overhead to some fast paths. > > Better would be likely to use RCU. RCU will be a problem if the registered notifiers need to block. > > -Andi > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > > -- ---------------------------------------------------------------------- Chandra Seetharaman | Be careful what you choose.... - sekharan@us.ibm.com | .......you may get it. ---------------------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2005-10-26 00:04 [W:0.527 / U:0.180 seconds] ©2003-2008 Jasper Spaans | |||||||||||||