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| author | kib <kib@FreeBSD.org> | 2014-12-13 16:18:29 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2014-12-13 16:18:29 +0000 |
| commit | d41bf48327e4a369279b68c229110e873880419a (patch) | |
| tree | 21a6b4ad228b2aef4fe0eedb1771d3e649435e34 /sys/kern/kern_exec.c | |
| parent | 07899121cbcd3408ca43bb2f40102fa7e41decae (diff) | |
| download | FreeBSD-src-d41bf48327e4a369279b68c229110e873880419a.zip FreeBSD-src-d41bf48327e4a369279b68c229110e873880419a.tar.gz | |
Add facility to stop all userspace processes. The supposed use of the
feature is to quisce the system before suspend.
Stop is implemented by reusing the thread_single(9) with the special
mode SINGLE_ALLPROC. SINGLE_ALLPROC differs from the existing
single-threading modes by allowing (requiring) caller to operate on
other process. Interruptible sleeps for !TDF_SBDRY threads are
suspended like SIGSTOP does it, instead of aborting the sleep, like
SINGLE_NO_EXIT, to avoid spurious EINTRs on resume.
Provide debugging sysctl debug.stop_all_proc, which causes total stop
and suspends syncer, while waiting for variable reset for resume. It
is used for debugging; should be removed after the real use of the
interface is added.
In collaboration with: pho
Discussed with: avg
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Diffstat (limited to 'sys/kern/kern_exec.c')
| -rw-r--r-- | sys/kern/kern_exec.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c index 7ae7d4e..19c33b6 100644 --- a/sys/kern/kern_exec.c +++ b/sys/kern/kern_exec.c @@ -289,7 +289,7 @@ kern_execve(td, args, mac_p) args->endp - args->begin_envv); if (p->p_flag & P_HADTHREADS) { PROC_LOCK(p); - if (thread_single(SINGLE_BOUNDARY)) { + if (thread_single(p, SINGLE_BOUNDARY)) { PROC_UNLOCK(p); exec_free_args(args); return (ERESTART); /* Try again later. */ @@ -308,9 +308,9 @@ kern_execve(td, args, mac_p) * force other threads to suicide. */ if (error == 0) - thread_single(SINGLE_EXIT); + thread_single(p, SINGLE_EXIT); else - thread_single_end(); + thread_single_end(p, SINGLE_BOUNDARY); PROC_UNLOCK(p); } if ((td->td_pflags & TDP_EXECVMSPC) != 0) { |
