site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Thanks mousse! That's the ticket! :-) - Greg On Feb 11, 2008, at 10:26 PM, mm w wrote: Hi Greg, as far I understand you want to use /System/Library/Frameworks/Kernel.framework/Headers/kern/locks.h nm /mach_kernel | grep lck_mtx_try_lock 0019aa30 T _lck_mtx_try_lock 004d1b03 D _lck_mtx_try_lock_lockstat_patch_point 0019a930 T _lck_mtx_try_lock_spin 004d1aff D _lck_mtx_try_lock_spin_lockstat_patch_point extern boolean_t lck_mtx_try_lock(lck_mtx_t *lck); further information: take a look here xnu/osfmk/i386/i386_lock.s or here xnu/osfmk/ppc/hw_lock.s and sure the IOKit interface http://developer.apple.com/documentation/Darwin/Reference/KernelIOKitFramewo... call me mousse,\\ enjoy -mmw On Feb 11, 2008, at 3:42 PM, mm w wrote: try to understand, what you do (if you use a lck object (locked)) if your lock object has been created, a lock has been aquired when you create a lock object, the lock system test it for you Hi mmw, thanks for your reply. I was specifically wondering how I could do this from a kernel extension? I don't see a header in Kernel.framework that contains any try_lock functions for lck_mtx_t. Thanks! - Greg Hmm... I've found this in the sources to xnu, but I can't find this in the Kernel.framework. Perhaps I should have mentioned that I'm writing a kernel extension. Does this exist for kernel extensions, and if so how do I access it? Right now I'm just linking against Kernel.framework, which doesn't seem to have this header. Thanks! - Greg -- -mmw _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... there is a private method: extern boolean_t lck_mtx_try_lock(lck_mtx_t *lck); but as I tried to explain you this API does the job for you, it is lock system/api for a mutex_t if you absolutely want to use it just declare it as extern in your header On Feb 11, 2008 6:54 PM, Greg <greg@kinostudios.com> wrote: hi Greg, yep these mechanisms exist, this is the first things that you implement when you write a lock system no matter on what: islockable and islocked -mmw This email sent to site_archiver@lists.apple.com