src/sys/compat/linux/linux_emul.c, branch release/7.0.0_cvs

This commit was manufactured by cvs2svn to create tag

2008-02-24T05:45:17+00:00

'RELENG_7_0_0_RELEASE'.

This commit was manufactured to restore the state of the 7.0-RELEASE image.

MFP4: Turn emul_lock into a mutex.

2007-04-02T18:38:13+00:00

Submitted by:	rdivacky

MFP4: 115220, 115222

2007-03-02T00:08:47+00:00

- Fix style(9) and reduce diff between amd64 and i386.
- Prefix Linuxulator macros with LINUX_ to prevent future collision.

Partial MFp4 of 114977:

2007-02-24T16:49:25+00:00

	Whitespace commit: Fix grammar, spelling and punctuation.

Submitted by:	"Scot Hetzel"

MFp4 (114193 (i386 part), 114194, 114195, 114200):

2007-02-23T22:39:26+00:00

 - Dont "return" in linux_clone() after we forked the new process in a case
   of problems.
 - Move the copyout of p2->p_pid outside the emul_lock coverage in
   linux_clone().
 - Cache the em->pdeath_signal in a local variable and move the copyout
   out of the emul_lock coverage.
 - Move the free() out of the emul_shared_lock coverage in a preparation
   to switch emul_lock to non-sleepable lock (mutex).

Submitted by:	rdivacky

MFp4 (part of 114132):

2007-02-23T22:29:24+00:00

 - Fix a LOR caused by holding emul_lock and proctree_lock at once.

Submitted by:	rdivacky

Remove extern int hz; use proper include file instead.

2007-02-02T08:58:16+00:00

No need to synchronize linux_schedtail with linux_proc_init.

2007-02-01T13:29:27+00:00

p->p_emuldata is properly initialized in the time when the child can run.

Do not set p->p_emuldata to NULL when the process is exiting.
It does not make any sense and only costs 2 mutex operations.

Do not lock emul_data to unlock it on the very next line.
Comment on possible race while there.

Reparent all procs that are part of a threading group but not its leaders
to init and SIGCHLD init to finish the zombies off. This fixes zombies
left after opera's exit. [1]

There is no need to lock p_em in the linux_proc_init CLONE_THREAD
case because the process cannot change the address of the p_em->shared
because its currently running this code path.
Move assigning of em->shared outside emul_shared_lock.

Noticed by: Scott Robbins  [1]
Submitted by: rdivacky

MFp4 (113077, 113083, 113103, 113124, 113097):

2007-01-20T14:58:59+00:00

	Dont expose em->shared to the outside world before its properly
	initialized. Might not affect anything but its at least a better
	coding style.

	Dont expose em via p->p_emuldata until its properly initialized.
	This also enables us to get rid of some locking and simplify the
	code because we are workin on a local copy.

	In linux_fork and linux_vfork create the process in stopped state
	to be sure that the new process runs with fully initialized emuldata
	structure [1]. Also fix the vfork (both in linux_clone and linux_vfork)
	race that could result in never woken up process [2].

Reported by:	Scot Hetzel	[1]
Suggested by:	jhb		[2]
Reviewed by:	jhb (at least some important parts)
Submitted by:	rdivacky
Tested by:	Scot Hetzel (on amd64)

Change 2 comments (in the new code) to comply to style(9).

Suggested by:	jhb

MFp4 (112499):

2007-01-07T19:09:20+00:00

Protect em->shared with the lock in case of CLONE_THREAD.

Submitted by:	rdivacky