> clone(child_stack=0xb7f7d4d4,
> flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|
> CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|
> CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID,
> parent_tidptr=0xb7f7dbe8,
> {entry_number:6, base_addr:0xb7f7dba0, limit:1048575,
> seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
> seg_not_present:0, useable:1},
> child_tidptr=0xb7f7dbe8) = 21945
hm, IIRC, what you see there (base_addr) is base address of TLS segment.
This segment is mapped on certain entry (see entry_number) in local CPU
GDT. Also, this segment is separated for user mode stack. However, it
makes sense to use base_addr of TLS segment since I must unique for
each thread on the same thread group.
Yes, base_addr is TLS segment base address, "man clone" will show us that
there is a five parameter clone(). However, I can't find the
five-parameter-clone's
implementation, there is only a sys_clone(), which has only one parameter.
I would appreciate it if anyone can tell me which is the
implementation function.
Regard,
Cheng
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
