svn commit: r236117 - in head/sys: kern sys

[Konstantin Belousov]

Author: kib
Date: Sat May 26 20:03:47 2012
New Revision: 236117
URL: http://svn.freebsd.org/changeset/base/236117

Log:
  Stop treating td_sigmask specially for the purposes of new thread
  creation. Move it into the copied region of the struct thread.
  
  Update some comments.
  
  Requested by:	bde
  X-MFC after:	never

Modified:
  head/sys/kern/kern_fork.c
  head/sys/kern/kern_kthread.c
  head/sys/kern/kern_thr.c
  head/sys/sys/proc.h

Modified: head/sys/kern/kern_fork.c
==============================================================================
--- head/sys/kern/kern_fork.c	Sat May 26 18:20:30 2012	(r236116)
+++ head/sys/kern/kern_fork.c	Sat May 26 20:03:47 2012	(r236117)
@@ -475,7 +475,6 @@ do_fork(struct thread *td, int flags, st
 
 	bcopy(&p2->p_comm, &td2->td_name, sizeof(td2->td_name));
 	td2->td_sigstk = td->td_sigstk;
-	td2->td_sigmask = td->td_sigmask;
 	td2->td_flags = TDF_INMEM;
 	td2->td_lend_user_pri = PRI_MAX;
 

Modified: head/sys/kern/kern_kthread.c
==============================================================================
--- head/sys/kern/kern_kthread.c	Sat May 26 18:20:30 2012	(r236116)
+++ head/sys/kern/kern_kthread.c	Sat May 26 20:03:47 2012	(r236117)
@@ -271,7 +271,6 @@ kthread_add(void (*func)(void *), void *
 
 	bzero(&newtd->td_startzero,
 	    __rangeof(struct thread, td_startzero, td_endzero));
-/* XXX check if we should zero. */
 	bcopy(&oldtd->td_startcopy, &newtd->td_startcopy,
 	    __rangeof(struct thread, td_startcopy, td_endcopy));
 
@@ -295,7 +294,6 @@ kthread_add(void (*func)(void *), void *
 	/* this code almost the same as create_thread() in kern_thr.c */
 	PROC_LOCK(p);
 	p->p_flag |= P_HADTHREADS;
-	newtd->td_sigmask = oldtd->td_sigmask; /* XXX dubious */
 	thread_link(newtd, p);
 	thread_lock(oldtd);
 	/* let the scheduler know about these things. */

Modified: head/sys/kern/kern_thr.c
==============================================================================
--- head/sys/kern/kern_thr.c	Sat May 26 18:20:30 2012	(r236116)
+++ head/sys/kern/kern_thr.c	Sat May 26 20:03:47 2012	(r236117)
@@ -252,7 +252,6 @@ create_thread(struct thread *td, mcontex
 
 	PROC_LOCK(td->td_proc);
 	td->td_proc->p_flag |= P_HADTHREADS;
-	newtd->td_sigmask = td->td_sigmask;
 	thread_link(newtd, p); 
 	bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
 	thread_lock(td);

Modified: head/sys/sys/proc.h
==============================================================================
--- head/sys/sys/proc.h	Sat May 26 18:20:30 2012	(r236116)
+++ head/sys/sys/proc.h	Sat May 26 20:03:47 2012	(r236117)
@@ -258,7 +258,6 @@ struct thread {
 	u_int		td_uticks;	/* (t) Statclock hits in user mode. */
 	int		td_intrval;	/* (t) Return value for sleepq. */
 	sigset_t	td_oldsigmask;	/* (k) Saved mask from pre sigpause. */
-	sigset_t	td_sigmask;	/* (c) Current signal mask. */
 	volatile u_int	td_generation;	/* (k) For detection of preemption */
 	stack_t		td_sigstk;	/* (k) Stack ptr and on-stack flag. */
 	int		td_xsig;	/* (c) Signal for ptrace */
@@ -272,10 +271,11 @@ struct thread {
 	struct osd	td_osd;		/* (k) Object specific data. */
 	struct vm_map_entry *td_map_def_user; /* (k) Deferred entries. */
 	pid_t		td_dbg_forked;	/* (c) Child pid for debugger. */
-#define	td_endzero td_rqindex
+#define	td_endzero td_sigmask
 
-/* Copied during fork1() or thread_sched_upcall(). */
+/* Copied during fork1() or create_thread(). */
 #define	td_startcopy td_endzero
+	sigset_t	td_sigmask;	/* (c) Current signal mask. */
 	u_char		td_rqindex;	/* (t) Run queue index. */
 	u_char		td_base_pri;	/* (t) Thread base kernel priority. */
 	u_char		td_priority;	/* (t) Thread active priority. */
@@ -285,7 +285,7 @@ struct thread {
 #define	td_endcopy td_pcb
 
 /*
- * Fields that must be manually set in fork1() or thread_sched_upcall()
+ * Fields that must be manually set in fork1() or create_thread()
  * or already have been set in the allocator, constructor, etc.
  */
 	struct pcb	*td_pcb;	/* (k) Kernel VA of pcb and kstack. */