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exit1(): update comment about thread_single()

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We do not check single-threading conditions in trap, or when sleeping
uninterruptible.

Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Differential revision:	https://reviews.freebsd.org/D36207
This commit is contained in:
Konstantin Belousov 2022-08-12 23:16:29 +03:00
parent f835be5822
commit 30b16a6bcf
1 changed files with 3 additions and 4 deletions
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7
sys/kern/kern_exit.c
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@ -276,16 +276,15 @@ exit1(struct thread *td, int rval, int signo)
* Kill off the other threads. This requires
* some co-operation from other parts of the kernel
* so it may not be instantaneous. With this state set
* any thread entering the kernel from userspace will
* thread_exit() in trap(). Any thread attempting to
* any thread attempting to interruptibly
* sleep will return immediately with EINTR or EWOULDBLOCK
* which will hopefully force them to back out to userland
* freeing resources as they go. Any thread attempting
* to return to userland will thread_exit() from userret().
* to return to userland will thread_exit() from ast().
* thread_exit() will unsuspend us when the last of the
* other threads exits.
* If there is already a thread singler after resumption,
* calling thread_single will fail; in that case, we just
* calling thread_single() will fail; in that case, we just
* re-check all suspension request, the thread should
* either be suspended there or exit.
*/