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Update locking scheme, mostly transition from sched_lock.

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This commit is contained in:
Sergey Kandaurov 2013-06-08 18:16:41 +00:00
parent 350db06539
commit 8830b71de2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251546
1 changed files with 14 additions and 22 deletions
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36
share/man/man9/signal.9
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@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd November 20, 2004
.Dd June 8, 2013
.Dt SIGNAL 9
.Os
.Sh NAME
@ -252,7 +252,7 @@ The
function resets the signal set and signal stack of a process in preparation
for an
.Xr execve 2 .
The lock for
The process lock for
.Fa p
must be held before
.Fn execsigs
@ -272,11 +272,9 @@ Stop signals are handled and cleared right away by
.Fn issignal
unless the process is a member of an orphaned process group and the stop
signal originated from a TTY.
The
.Va sched_lock
lock may be acquired and released, and if
.Va Giant
is held, it may be released and reacquired.
The process spin lock for
.Fa td->td_proc
may be acquired and released.
The
.Vt sigacts
structure
@ -289,9 +287,6 @@ The process lock for
must be acquired before calling
.Fn issignal
and may be released and reacquired during the call.
The lock for the parent of
.Fa td->td_proc
may also be acquired and released.
Default signal actions are not taken for system processes and init.
.Pp
The
@ -342,7 +337,7 @@ after the kernel has been notified that a signal should be delivered
which causes the flag
.Dv PS_NEEDSIGCHK
to be set).
The lock for process that owns
The process lock for process that owns
.Va curthread
must be held before
.Fn postsig
@ -360,7 +355,7 @@ function causes the process that owns
to exit with a return value of signal number
.Fa sig .
If required, the process will dump core.
The lock for the process that owns
The process lock for the process that owns
.Fa td
must be held before
.Fn sigexit
@ -377,8 +372,8 @@ to be ignored by
.Fa p .
The process lock for
.Fa p
is acquired and released by
.Fn siginit .
is acquired and released, as is the lock for sigacts structure
.Fa p->p_sigacts .
The only process that
.Fn siginit
is ever called for
@ -390,13 +385,11 @@ The
function flags that there are unmasked signals pending that
.Fn ast
should handle.
The lock for process
The process lock for process
.Fa td->td_proc
must be held before
.Fn signotify
is called, and
.Va sched_lock
is acquired and released.
is called, and the thread lock is acquired and released.
.Pp
The
.Fn trapsignal
@ -410,10 +403,9 @@ will deliver it directly; otherwise,
will call
.Xr psignal 9
to cause the signal to be delivered.
The
.Va sched_lock
lock is acquired and released, as is the lock for
.Fa td->td_proc .
The process lock for
.Fa td->td_proc
is acquired and released.
The lock for the
.Va p_sigacts
field of