>i remember filling GDT with TLS segments for glibc. what does this >segment mean ? is it that the glibc libraries are found in this >segment ? here is my view TLS is a thread local storage segment, this concept is used in threading abstractions to store the per thread local data. yes, when we fill the GDT there is also an entry for the pointer in TLS segment #1 descriptor. The _thread extension is already supported by glibc.The kernel keeps a specific per thread GDT entry that can be set up and modified by each thread. The kernel upon context switch, modifies this GDT entry to match that of the thread's TLS setting.this way user space threaded code can access per thread data via this descriptor regards lk -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
