d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add stop_all_proc_block(9)

Browse Source 
It allows to have more than one consumer of thread_signle(SIGNLE_ALLPROC) by
serializing them.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D35014
This commit is contained in:
Konstantin Belousov 2022-04-24 01:55:04 +03:00
parent 54a11adbd9
commit 2e7595ef2f
2 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
sys/kern/kern_proc.c
View File

@ -3396,6 +3396,21 @@ static SYSCTL_NODE(_kern_proc, KERN_PROC_VM_LAYOUT, vm_layout, CTLFLAG_RD |
CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, sysctl_kern_proc_vm_layout,
"Process virtual address space layout info");
static struct sx stop_all_proc_blocker;
SX_SYSINIT(stop_all_proc_blocker, &stop_all_proc_blocker, "sapblk");
void
stop_all_proc_block(void)
{
sx_xlock(&stop_all_proc_blocker);
}
void
stop_all_proc_unblock(void)
{
sx_xunlock(&stop_all_proc_blocker);
}
int allproc_gen;
/*
@ -3411,6 +3426,8 @@ stop_all_proc(void)
int r, gen;
bool restart, seen_stopped, seen_exiting, stopped_some;
stop_all_proc_block();
cp = curproc;
allproc_loop:
sx_xlock(&allproc_lock);
@ -3502,6 +3519,8 @@ resume_all_proc(void)
goto again;
}
sx_xunlock(&allproc_lock);
stop_all_proc_unblock();
}
/* #define TOTAL_STOP_DEBUG 1 */

2
sys/sys/proc.h
View File

@ -1232,6 +1232,8 @@ void thread_unlink(struct thread *td);
void thread_unsuspend(struct proc *p);
void thread_wait(struct proc *p);
void stop_all_proc_block(void);
void stop_all_proc_unblock(void);
void stop_all_proc(void);
void resume_all_proc(void);