Stanislav Sedov wrote:
On Thu, 22 Oct 2009 16:20:32 +0800
"Yan, Yeqing" <yeqing....@intel.com> mentioned:
kse_exit
kse_wakeup
kse_create
kse_thr_interrupt
kse_release
kse_switchin
I read $man kse, but I can not find any example about how to use it. I write
some test codes to call these function but all these codes are failed.
The kse man page documents the syscalls but they are intended to be
used only by the libkse library.
there was some early test code in /usr/src/tools/KSE but it probably
doesn't eve n compile any more.
mac_syscall
I read $man 3 mac, but I can not find the usage about mac_syscall function.
thr_create
thr_suspend
thr_kill2
Once again, these calls are meant to be only accessed from
the threading library.
(though man pages should be written)
I fear there's no documentation on these syscalls exists. So for use
information
you'll have to refer to the actual source code of these syscalls/or and
libc/libthr
source code which makes uses of them.
By the way, it is said “I think that KSE was used in 5.x and 6.x and then
dropped in favor of a 1:1 threading model when 7.0 was released”
Does it mean the KSE syscall can be removed from FreeBSD 7.0?
it will remain oin all 7.x kernels but is removed from 8.x
libkse (M:N threading) was default threading library on FreeBSD versions prior
to
7.0, and the default has changed to libthr (1:1 threading in FreeBSD 7). libkse
was completely removed in FreeBSD 8, but it is still functional on FreeBSD 7.x.
KSE based threading, while theoretically useful introduces a number of
annoying complications to the kernel and was "holding up" other
developement. Since Linux has gone with 1:1 threading, nearly all
applications a re now written with 1:1 threading in mind so it made
little sense to maintain all the extra complexity for no reason.
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