Commit Graph

125 Commits

Author SHA1 Message Date
gmcgarry 6a6ea308fd Separate the scheduler from the context switching code.
This is done by adding an extra argument to mi_switch() and
cpu_switch() which specifies the new process.  If NULL is passed,
then the new function chooseproc() is invoked to wait for a new
process to appear on the run queue.

Also provides an opportunity for optimisations if "switching to self".

Also added are C versions of the setrunqueue() and remrunqueue()
low-level primitives if __HAVE_MD_RUNQUEUE is not defined by MD code.

All these changes are contingent upon the __HAVE_CHOOSEPROC flag being
defined by MD code to indicate that cpu_switch() supports the changes.
2002-09-22 05:36:48 +00:00
matt 48bbf5f234 Use the queue macros from <sys/queue.h> instead of referring to the queue
members directly.  Use *_FOREACH whenever possible.
2002-09-04 01:32:31 +00:00
thorpej f1e8d159b0 Fix signed/unsigned conditional expression warning from GCC 3.3. 2002-08-25 21:47:50 +00:00
manu 08a69f7d15 Make killproc really public, and while we are there, constify. 2002-07-28 22:18:51 +00:00
thorpej 011d4d5f44 Add kernel support for having userland provide the signal trampoline:
* struct sigacts gets a new sigact_sigdesc structure, which has the
  sigaction and the trampoline/version.  Version 0 means "legacy kernel
  provided trampoline".  Other versions are coordinated with machine-
  dependent code in libc.
* sigaction1() grows two more arguments -- the trampoline pointer and
  the trampoline version.
* A new __sigaction_sigtramp() system call is provided to register a
  trampoline along with a signal handler.
* The handler is no longer passed to sensig() functions.  Instead,
  sendsig() looks up the handler by peeking in the sigacts for the
  process getting the signal (since it has to look in there for the
  trampoline anyway).
* Native sendsig() functions now select the appropriate trampoline and
  its arguments based on the trampoline version in the sigacts.

Changes to libc to use the new facility will be checked in later.  Kernel
version not bumped; we will ride the 1.6C bump made recently.
2002-07-04 23:32:02 +00:00
thorpej a180cee23b Pool deals fairly well with physical memory shortage, but it doesn't
deal with shortages of the VM maps where the backing pages are mapped
(usually kmem_map).  Try to deal with this:

* Group all information about the backend allocator for a pool in a
  separate structure.  The pool references this structure, rather than
  the individual fields.
* Change the pool_init() API accordingly, and adjust all callers.
* Link all pools using the same backend allocator on a list.
* The backend allocator is responsible for waiting for physical memory
  to become available, but will still fail if it cannot callocate KVA
  space for the pages.  If this happens, carefully drain all pools using
  the same backend allocator, so that some KVA space can be freed.
* Change pool_reclaim() to indicate if it actually succeeded in freeing
  some pages, and use that information to make draining easier and more
  efficient.
* Get rid of PR_URGENT.  There was only one use of it, and it could be
  dealt with by the caller.

From art@openbsd.org.
2002-03-08 20:48:27 +00:00
christos eebee4d7f8 PR/14795: Christos Zoulas: Fix locking problem on MP systems where
ltsleep() is calling CURSIG() which can call issignal() and issignal()
could not deal with being called from a locked context. This happens
when a process receives SIGTTIN, and issignal() calls psignal() to
post SIGCHLD to the parent.

XXX: It is really messy to have issignal() handle the job control
functionality and the whole signal interlocking protocol needs to
be re-designed. For now this fix (provided by enami) does the trick.
I've been running with this fix for weeks, and atatat has stress-tested
the kernel running ~30 make kernels...
2001-12-18 15:51:52 +00:00
thorpej 205c159f0e Make the coredump routine exec-format/emulation specific. Split
out traditional NetBSD coredump routines into core_netbsd.c and
netbsd32_core.c (for COMPAT_NETBSD32).
2001-12-08 00:35:25 +00:00
enami 4654f5c754 Implement sigismasked() correctly. KNF while I'm here. 2001-12-05 07:32:24 +00:00
lukem adc783d537 add RCSIDs 2001-11-12 15:25:01 +00:00
thorpej 33d6023447 Unshare signal actions on exec.
From Matthew Orgass <darkstar@pgh.net>.
2001-07-18 05:34:58 +00:00
nathanw 9e8fb68348 The trace_req() function is a no-op; garbage collect it. 2001-06-13 16:06:27 +00:00
mrg 1ce89f683e in coredump() remove the COMPAT_NETBSD32 #ifdef, and replace it with a hook.
move coredump32() into compat/netbsd32.
2001-06-06 21:37:19 +00:00
lukem 602451ac6e convert to ANSI KNF 2001-02-26 21:58:30 +00:00
nathanw 214bc3e43f All of our ports have reasonable cpu_coredump()'s that set
core.c_midmag. Garbage collect the "traditional dump" code that
handled the core.c_midmag == 0 case.
2001-02-23 22:01:50 +00:00
thorpej 7200d34a76 Whenever ps_sigcheck is set to true, signotify() the process, and
wrap this all up in a CHECKSIGS() macro.  Also, in psignal1(),
signotify() SRUN and SIDL processes if __HAVE_AST_PERPROC is defined.

Per discussion w/ mycroft.
2001-01-14 22:31:58 +00:00
jdolecek e9e91a0fb5 split off thread specific stuff from struct sigacts to struct sigctx, leaving
only signal handler array sharable between threads
move other random signal stuff from struct proc to struct sigctx

This addresses kern/10981 by Matthew Orgass.
2000-12-22 22:58:52 +00:00
jdolecek e8e4da6b87 add new function sigismasked(), which checks whether passed signal
is ignored or masked by the process, and use it appropriately
instead of directly checking p->p_sigmask and p->p_sigignore
2000-11-05 15:37:09 +00:00
enami 25ea453471 Pathname of length 1023 (MAXPATHLEN - 1) should be valid as corename. 2000-09-23 00:48:29 +00:00
thorpej f759220f40 Define the MI parts of the "big kernel lock" perimeter. From
Bill Sommerfeld.
2000-08-22 17:28:28 +00:00
thorpej f42254818f splhigh() -> splsched() 2000-08-21 02:09:33 +00:00
thorpej a86d1f4891 Add a lock around the scheduler, and use it as necessary, including
in the non-MULTIPROCESSOR case (LOCKDEBUG requires it).  Scheduler
lock is held upon entry to mi_switch() and cpu_switch(), and
cpu_switch() releases the lock before returning.

Largely from Bill Sommerfeld, with some minor bug fixes and
machine-dependent code hacking from me.
2000-08-20 21:50:06 +00:00
mrg 705b50bf32 fix LP64 warnings. 2000-07-27 14:00:56 +00:00
sommerfeld bb22022c59 Format paranoia. 2000-07-08 18:10:25 +00:00
mrg 32aa199ccf remove include of <vm/vm.h> 2000-06-27 17:41:07 +00:00
sommerfeld 40339b39f9 Reduce use of curproc in several places:
- Change ktrace interface to pass in the current process, rather than
p->p_tracep, since the various ktr* function need curproc anyway.

 - Add curproc as a parameter to mi_switch() since all callers had it
handy anyway.

 - Add a second proc argument for inferior() since callers all had
curproc handy.

Also, miscellaneous cleanups in ktrace:

 - ktrace now always uses file-based, rather than vnode-based I/O
(simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD.
Do non-blocking I/O, and yield a finite number of times when receiving
EWOULDBLOCK before giving up.

 - move code duplicated between sys_fktrace and sys_ktrace into ktrace_common.

 - simplify interface to ktrwrite()
2000-05-27 00:40:29 +00:00
thorpej 8964c35eca Introduce a new process state distinct from SRUN called SONPROC
which indicates that the process is actually running on a
processor.  Test against SONPROC as appropriate rather than
combinations of SRUN and curproc.  Update all context switch code
to properly set SONPROC when the process becomes the current
process on the CPU.
2000-05-26 00:36:42 +00:00
augustss 264f1d27c6 Get rid of register declarations. 2000-03-30 09:27:11 +00:00
fair 554df2b994 remove kern_logsigexit being "on" for DIAGNOSTIC 2000-02-08 04:13:51 +00:00
fair c75556a12f Add kernel logging of processes which exit on signals which can
cause a core to drop, and whether the core dropped, or, if it did
not, why not (i.e. error number). Logs process ID, name, signal that
hit it, and whether the core dump was successful.

logging only happens if kern_logsigexit is non-zero, and it can be
changed by the new sysctl(3) value KERN_LOGSIGEXIT. The name of this
sysctl and its function are taken from FreeBSD, at the suggestion
of Greg Woods in PR 6224. Default behavior is zero for a normal
kernel, and one for a kernel compiled with DIAGNOSTIC.
2000-02-06 07:29:56 +00:00
eeh f293acc959 Dump cores for 32-bit processes. 1999-12-30 16:00:23 +00:00
bouyer 52497e180a Remplace kern.shortcorename sysctl with a more flexible sheme,
core filename format, which allow to change the name of the core dump,
and to relocate it in a directory. Credits to Bill Sommerfeld for giving me
the idea :)
The default core filename format can be changed by options DEFCORENAME and/or
kern.defcorename
Create a new sysctl tree, proc, which holds per-process values (for now
the corename format, and resources limits). Process is designed by its pid
at the second level name. These values are inherited on fork, and the corename
fomat is reset to defcorename on suid/sgid exec.
Create a p_sugid() function, to take appropriate actions on suid/sgid
exec (for now set the P_SUGID flag and reset the per-proc corename).
Adjust dosetrlimit() to allow changing limits of one proc by another, with
credential controls.
1999-09-28 14:47:00 +00:00
bouyer 051211ffa9 Add a new flag, used by vn_open() which prevent symlinks from being followed
at open time. Use this to prevent coredump to follow symlinks when the
kernel opens/creates the file.
1999-08-31 12:30:35 +00:00
thorpej ea8fb3e04a Turn the proclist lock into a read/write spinlock. Update proclist locking
calls to reflect this.  Also, block statclock rather than softclock during
in the proclist locking functions, to address a problem reported on
current-users by Sean Doran.
1999-07-25 06:30:33 +00:00
thorpej 01a8cffe77 Add a read/write lock to the proclists and PID hash table. Use the
write lock when doing PID allocation, and during the process exit path.
Use a read lock every where else, including within schedcpu() (interrupt
context).  Note that holding the write lock implies blocking schedcpu()
from running (blocks softclock).

PID allocation is now MP-safe.

Note this actually fixes a bug on single processor systems that was probably
extremely difficult to tickle; it was possible that schedcpu() would run
off a bad pointer if the right clock interrupt happened to come in the
middle of a LIST_INSERT_HEAD() or LIST_REMOVE() to/from allproc.
1999-07-22 21:08:30 +00:00
thorpej 2715b812d1 Rework the process exit path, in preparation for making process exit
and PID allocation MP-safe.  A new process state is added: SDEAD.  This
state indicates that a process is dead, but not yet a zombie (has not
yet been processed by the process reaper).

SDEAD processes exist on both the zombproc list (via p_list) and deadproc
(via p_hash; the proc has been removed from the pidhash earlier in the exit
path).  When the reaper deals with a process, it changes the state to
SZOMB, so that wait4 can process it.

Add a P_ZOMBIE() macro, which treats a proc in SZOMB or SDEAD as a zombie,
and update various parts of the kernel to reflect the new state.
1999-07-22 18:13:36 +00:00
thorpej 2835fc6e46 Pull signal actions out of struct user, make them a separate proc
substructure, and allow them to be shared.

Required for clone(2).
1999-04-30 21:23:49 +00:00
thorpej 16936c9565 Break cdir/rdir/cmask info out of struct filedesc, and put it in a new
substructure, `cwdinfo'.  Implement optional sharing of this substructure.

This is required for clone(2).
1999-04-30 18:42:58 +00:00
mrg d2397ac5f7 completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.
1999-03-24 05:50:49 +00:00
christos ac66b8f92d Don't forget to lower the spl in the error case of sigprocmask 1999-02-13 15:25:51 +00:00
mycroft 1115f2e840 Er, NSIG is one *more* than the number of signals. 1998-11-13 17:23:52 +00:00
mycroft d6ffecf67c Oops; signal numbers are 1..NSIG, not 0..NSIG-1. 1998-11-13 17:12:54 +00:00
drochner 835d1b736c Make contsigmask, stopsigmask, sigcantmask kernel private. 1998-10-03 14:29:02 +00:00
enami 19031a5309 make this file compile again; the variable points signal action being
set is `nsa' and there is no variable `sa'.
1998-09-19 02:00:52 +00:00
christos eb1a214078 Add NOCLDWAIT (from FreeBSD) 1998-09-18 18:48:22 +00:00
pk 470227cc3b Check that the `current directory' is still mounted before dropping core in it. 1998-09-11 13:25:20 +00:00
mycroft fb526e055c Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
  versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
  sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
  sys_sigpending() and sys_sigsuspend() into separate functions, and call them
  from all the emulations rather than hard-coding everything.  (Avoids uses
  the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
  pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
  bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
  in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified.  Other ports and
emulations need to be updated.
1998-09-11 12:50:05 +00:00
perry 275d1554aa Abolition of bcopy, ovbcopy, bcmp, and bzero, phase one.
bcopy(x, y, z) ->  memcpy(y, x, z)
ovbcopy(x, y, z) -> memmove(y, x, z)
   bcmp(x, y, z) ->  memcmp(x, y, z)
  bzero(x, y)    ->  memset(x, 0, y)
1998-08-04 04:03:10 +00:00
perry 730baa7431 fix sizeofs so they comply with the KNF style guide. yes, it is pedantic. 1998-07-31 22:50:48 +00:00
thorpej e95c22ee96 Don't cast the null residual pointer passed to vn_rdwr(). 1998-07-28 18:17:34 +00:00