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Clean up confusing comment. Move it to the place of code which is

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talked about.  Explain where the mentioned trampoline located
(usermode), and the fact that attempt to exit last thread is denied in
kernel (by delegating the work to usermode).

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2014-11-03 11:29:08 +00:00
parent d2d52b0013
commit 74d5b4af82
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=274038
1 changed files with 6 additions and 4 deletions
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10
sys/kern/kern_thr.c
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@ -317,10 +317,6 @@ sys_thr_exit(struct thread *td, struct thr_exit_args *uap)
PROC_LOCK(p);
/*
* Shutting down last thread in the proc. This will actually
* call exit() in the trampoline when it returns.
*/
if (p->p_numthreads != 1) {
racct_sub(p, RACCT_NTHR, 1);
LIST_REMOVE(td, td_hash);
@ -331,6 +327,12 @@ sys_thr_exit(struct thread *td, struct thr_exit_args *uap)
thread_exit();
/* NOTREACHED */
}
/*
* Ignore attempts to shut down last thread in the proc. This
* will actually call _exit(2) in the usermode trampoline when
* it returns.
*/
PROC_UNLOCK(p);
rw_wunlock(&tidhash_lock);
return (0);