The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=2e7595ef2f53f6debec3c3d89bb9e0cd10394ed3
commit 2e7595ef2f53f6debec3c3d89bb9e0cd10394ed3 Author: Konstantin Belousov <[email protected]> AuthorDate: 2022-04-23 22:55:04 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2022-04-27 23:27:35 +0000 Add stop_all_proc_block(9) 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 --- sys/kern/kern_proc.c | 19 +++++++++++++++++++ sys/sys/proc.h | 2 ++ 2 files changed, 21 insertions(+) diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c index d5aae09f2c4e..cd528d47830d 100644 --- a/sys/kern/kern_proc.c +++ b/sys/kern/kern_proc.c @@ -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 @@ again: goto again; } sx_xunlock(&allproc_lock); + + stop_all_proc_unblock(); } /* #define TOTAL_STOP_DEBUG 1 */ diff --git a/sys/sys/proc.h b/sys/sys/proc.h index 2556fd574d84..223714724aca 100644 --- a/sys/sys/proc.h +++ b/sys/sys/proc.h @@ -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);
