On Feb 24 05:00, Yaakov (Cygwin/X) wrote: > On Fri, 2012-02-24 at 10:38 +0100, Corinna Vinschen wrote: > > On Feb 23 21:38, Yaakov (Cygwin/X) wrote: > > > This patchset adds pthread_getname_np and pthread_setname_np. These > > > were added to glibc in 2.12[1] and are also present in some form on > > > NetBSD and several UNIXes. IIUC recent versions of GDB can benefit from > > > this support. > > > > Thanks for your patch, but I don't think it's the whole thing. > > > > Consider, if you implement pthread_[gs]etname_np as you did, then you > > have pthread names which are only available to the process in which > > the threads are running. > > My implementation is based on NetBSD's[1]. So what purpose do these > functions serve then on that it and the UNIXes? (Serious question.)
See the source of the pthread_setname_np function. There's a call to the kernel: thread->pt_name = cp; (void)_lwp_setname(thread->pt_lid, cp); _lwp_setname ultimately calls the kernel function sys__lwp_setname in http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/kern/sys_lwp.c?rev=1.53 So the kernel knows the name and the sys__lwp_getname entry point can be used to fetch the name of a thread in another process. How exactly this is fetched by which BSD tool, I don't know, but it's all in the sources :) Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat
