Mark exit1() and sigexit() as non-returning

The late 1990s reasons for avoiding __dead with exit1() should not apply
with the current compilers.

This fixes compiler warnings about uninitialized var

Mark exit1() and sigexit() as non-returning

The late 1990s reasons for avoiding __dead with exit1() should not apply
with the current compilers.

This fixes compiler warnings about uninitialized variables in trap.c
on mips64.

Discussed with guenther@ and miod@

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Remove unneeded <sys/stdarg.h>.

OK guenther@

Remove sigacts structure sharing. The only process that used sharing was
proc0 which is used for kthreads and idle threads. proc0 and all those
other kernel threads don't handle signals so there is n

Remove sigacts structure sharing. The only process that used sharing was
proc0 which is used for kthreads and idle threads. proc0 and all those
other kernel threads don't handle signals so there is no benefit in sharing.
Simplifies the code a fair bit since the refcnt is gone.
OK kettenis@

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Replace p_xstat with ps_xexit and ps_xsig
Convert those to a consolidated status when needed in wait4(), kevent(),
and sysctl()
Pass exit code and signal separately to exit1()
(This also serves as p

Replace p_xstat with ps_xexit and ps_xsig
Convert those to a consolidated status when needed in wait4(), kevent(),
and sysctl()
Pass exit code and signal separately to exit1()
(This also serves as prep for adding waitid(2))

ok mpi@

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Grab the KERNEL_LOCK() in kthread_create(9) to enable unlocked code
paths create kernel threads. This will be utilized by sosplice()
for the taskq allocation.

OK mpi@

Split up fork1():
- FORK_THREAD handling is a totally separate function, thread_fork(),
that is only used by sys___tfork() and which loses the flags, func,
arg, and newprocp parameters and gai

Split up fork1():
- FORK_THREAD handling is a totally separate function, thread_fork(),
that is only used by sys___tfork() and which loses the flags, func,
arg, and newprocp parameters and gains tcb parameter to guarantee
the new thread's TCB is set before the creating thread returns
- fork1() loses its stack and tidptr parameters
Common bits factor out:
- struct proc allocation and initialization moves to thread_new()
- maxthread handling moves to fork_check_maxthread()
- setting the new thread running moves to fork_thread_start()
The MD cpu_fork() function swaps its unused stacksize parameter for
a tcb parameter.

luna88k testing by aoyama@, alpha testing by dlg@
ok mpi@

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p_comm is the process's command and isn't per thread, so move it from
struct proc to struct process.

ok deraadt@ kettenis@

Split PID from TID, giving processes a PID unrelated to the TID of their
initial thread

ok jsing@ kettenis@

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

pass size argument to free()
ok doug tedu

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

Add PS_SYSTEM, the process-level mirror of the thread-level P_SYSTEM,
and FORK_SYSTEM as a flag to set them. This eliminates needing to
peek into other processes threads in various places. Inspired

Add PS_SYSTEM, the process-level mirror of the thread-level P_SYSTEM,
and FORK_SYSTEM as a flag to set them. This eliminates needing to
peek into other processes threads in various places. Inspired by NetBSD

ok miod@ matthew@

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Eliminate the exit sig handling, which was only invokable via the
Linux-compat clone() syscall when *not* using CLONE_THREAD. pirofti@
confirms Opera runs in compat without this, so out it goes; one

Eliminate the exit sig handling, which was only invokable via the
Linux-compat clone() syscall when *not* using CLONE_THREAD. pirofti@
confirms Opera runs in compat without this, so out it goes; one less hair
to choke on in kern_exit.c

ok tedu@ pirofti@

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simplify kthread_create(). no more stdarg
ok matthew guenther mikeb

do not include machine/cpu.h from a .c file; it is the responsibility of
.h files to pull it in, if needed
ok tedu

Change fork1() and kthread_create() to match the rest of the tree
and use curp vs p instead of p1 vs p2. Add curpr and pr variables
for the respective struct processes. Make sigactsshare() return
t

Change fork1() and kthread_create() to match the rest of the tree
and use curp vs p instead of p1 vs p2. Add curpr and pr variables
for the respective struct processes. Make sigactsshare() return
the shared sigacts intead of taking the struct proc to update.

ok deraadt@

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First pass at removing clauses 3 and 4 from NetBSD licenses.

Not sure what's more surprising: how long it took for NetBSD to
catch up to the rest of the BSDs (including UCB), or the amount of
code t

First pass at removing clauses 3 and 4 from NetBSD licenses.

Not sure what's more surprising: how long it took for NetBSD to
catch up to the rest of the BSDs (including UCB), or the amount of
code that NetBSD has claimed for itself without attributing to the
actual authors.

OK deraadt@

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Pass FORK_SHAREFILES flag in kthread_create; avoids allocating a
filedesc struct and associated fdcopy operation on kernel thread
creation. Instead, kernel threads share and bump reference count
on p

Pass FORK_SHAREFILES flag in kthread_create; avoids allocating a
filedesc struct and associated fdcopy operation on kernel thread
creation. Instead, kernel threads share and bump reference count
on proc0's filedesc.

ok thib@, "definitely makes sense" art@

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Use M_ZERO in a few more places to shave bytes from the kernel.

eyeballed and ok dlg@

Since p_flag is often manipulated in interrupts and without biglock
it's a good idea to use atomic.h operations on it. This mechanic
change updates all bit operations on p_flag to atomic_{set,clear}b

Since p_flag is often manipulated in interrupts and without biglock
it's a good idea to use atomic.h operations on it. This mechanic
change updates all bit operations on p_flag to atomic_{set,clear}bits_int.

Only exception is that P_OWEUPC is set by MI code before calling
need_proftick and it's automatically cleared by ADDUPC. There's
no reason for MD handling of that flag since everyone handles it the
same way.

kettenis@ ok

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Kernel stack can be swapped. This means that stuff that's on the stack
should never be referenced outside the context of the process to which
this stack belongs unless we do the PHOLD/PRELE dance. Lo

Kernel stack can be swapped. This means that stuff that's on the stack
should never be referenced outside the context of the process to which
this stack belongs unless we do the PHOLD/PRELE dance. Loads of code
doesn't follow the rules here. Instead of trying to track down all
offenders and fix this hairy situation, it makes much more sense
to not swap kernel stacks.

From art@, tested by many some time ago.

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kernel support for threaded processes (rthreads).
uses rfork(RFTHREAD) to create threads, which are presently processes
that are a little more tightly bound together. several new syscalls
added to f

kernel support for threaded processes (rthreads).
uses rfork(RFTHREAD) to create threads, which are presently processes
that are a little more tightly bound together. several new syscalls
added to facilitate a userland thread library.
all conditional on RTHREADS, currently disabled.
ok deraadt

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Have kthread_create_deferred() act immediately once kthread_run_deferred_queue()
has been invoked; forgotten part of the ``create init earlier'' changes.
From NetBSD as well.
ok deraadt@ dlg@

Create the init process earlier, before the root filesystem is mounted,
and have it stall on a semaphore. This allows all kthread creations which
could have been requested during autoconf to be proce

Create the init process earlier, before the root filesystem is mounted,
and have it stall on a semaphore. This allows all kthread creations which
could have been requested during autoconf to be processed before root
is mounted as well.

This causes umass devices attached to any usb with flags 1 (such as on macppc)
to configure properly instead of panicing the kernel at mountroot time.

From NetBSD; tested by various.

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Remove useless ``elm'' argument from the SIMPLEQ_REMOVE_HEAD macro.
This matches our SLIST behaviour and NetBSD's SIMPLEQ as well.

ok millert krw deraadt