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Add thread_run_flash() helper

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It unsuspends single suspended thread, passed as the argument.
It is up to the caller to arrange the target thread to suspend later,
since the state of the process is not changed from stopped.  In particular,
the unsuspended thread must not leave to userspace, since boundary code
is not prepared to this situation.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D29955
This commit is contained in:
Konstantin Belousov 2021-04-24 14:47:53 +03:00
parent 15465a2c25
commit af928fded0
2 changed files with 26 additions and 0 deletions
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25
sys/kern/kern_thread.c
View File

@ -1514,6 +1514,31 @@ thread_unsuspend_one(struct thread *td, struct proc *p, bool boundary)
return (setrunnable(td, 0));
}
void
thread_run_flash(struct thread *td)
{
struct proc *p;
p = td->td_proc;
PROC_LOCK_ASSERT(p, MA_OWNED);
if (TD_ON_SLEEPQ(td))
sleepq_remove_nested(td);
else
thread_lock(td);
THREAD_LOCK_ASSERT(td, MA_OWNED);
KASSERT(TD_IS_SUSPENDED(td), ("Thread not suspended"));
TD_CLR_SUSPENDED(td);
PROC_SLOCK(p);
MPASS(p->p_suspcount > 0);
p->p_suspcount--;
PROC_SUNLOCK(p);
if (setrunnable(td, 0))
kick_proc0();
}
/*
* Allow all threads blocked by single threading to continue running.
*/

1
sys/sys/proc.h
View File

@ -1191,6 +1191,7 @@ void thread_stopped(struct proc *p);
void childproc_stopped(struct proc *child, int reason);
void childproc_continued(struct proc *child);
void childproc_exited(struct proc *child);
void thread_run_flash(struct thread *td);
int thread_suspend_check(int how);
bool thread_suspend_check_needed(void);
void thread_suspend_switch(struct thread *, struct proc *p);