Commit Graph

46 Commits

Author SHA1 Message Date
thorpej 956b3ca3b3 Track which process a CPU is running/has last run on by adding a
p_cpu member to struct proc.  Use this in certain places when
accessing scheduler state, etc.  For the single-processor case,
just initialize p_cpu in fork1() to avoid having to set it in the
low-level context switch code on platforms which will never have
multiprocessing.

While I'm here, comment a few places where there are known issues
for the SMP implementation.
2000-05-31 05:02:31 +00:00
sommerfeld a3edbba355 Add null-pointer tests in ktrsamefile 2000-05-29 22:29:01 +00:00
sommerfeld 879eaa480a Fix clearing of ktrace points:
- need deep compare of open files, not a shallow pointer compare.
 - reorder fdrelease()/FILE_UNUSE() invocations so fdrelease doesn't
block waiting for something which can't happen until after it returns.
2000-05-29 22:04:11 +00:00
sommerfeld a56cb94b43 Deal with NULL file pointer for KTROP_CLEAR 2000-05-28 15:27:51 +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 a7d0570e67 First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

	- Global state: sched_qs (run queues), sched_whichqs (bitmap
	  of non-empty run queues), sched_slpque (sleep queues).
	  NOTE: These may collectively move into a struct schedstate
	  at some point in the future.

	- Per-CPU state, struct schedstate_percpu: spc_runtime
	  (time process on this CPU started running), spc_flags
	  (replaces struct proc's p_schedflags), and
	  spc_curpriority (usrpri of processes on this CPU).

	- Every platform must now supply a struct cpu_info and
	  a curcpu() macro.  Simplify existing cpu_info declarations
	  where appropriate.

	- All references to per-CPU scheduler state now made through
	  curcpu().  NOTE: this will likely be adjusted in the future
	  after further changes to struct proc are made.

Tested on i386 and Alpha.  Changes are mostly mechanical, but apologies
in advance if it doesn't compile on a particular platform.
2000-05-26 21:19:19 +00:00
thorpej bc074bcbcf ktrgenio(): __predict_false() ktrwrite() failing.
ktrwrite(): __predict_true() no error occuring.
2000-05-08 20:01:05 +00:00
thorpej c6fa58a322 - Allocate the ktrace operation header on the stack rather than using
MALLOC()/FREE().
- In ktrgenio():
	- Don't allocate the entire size of the I/O for the temporary
	  buffer used to write the data to the trace file.  Instead,
	  do it in page-sized chunks.
	- As in uiomove(), preempt the process if we are hogging the CPU.
	- If writing to the trace file errors, abort rather than continuing
	  to loop through the buffer.

From Artur Grabowski <art@stacken.kth.se>, with some additional cleanup
by me.
2000-04-19 19:14:17 +00:00
darrenr 8b165c84f7 don't log an error for ktrace if it's EPIPE - an error that should be
expected with fktrace/ktruss (i.e the error is `noise').
1999-07-25 13:59:08 +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 e3669c3393 Add "use counting" to file entries. When closing a file, and it's reference
count is 0, wait for use count to drain before finishing the close.

This is necessary in order for multiple processes to safely share file
descriptor tables.
1999-05-05 20:01:01 +00:00
kleink bff1bef006 * Add a comment to ktrgetheader() mentioning that ktr_len and ktr_buf are
being left uninitialized intentionally; addresses PR kern/6987.
* In ktrsysret(), initialize the unused ktr_eosys to avoid writing random junk.
1999-04-11 18:44:00 +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 a4a34ba74a Add two additional arguments to the fileops read and write calls, a
pointer to the offset to use, and a flags word.  Define a flag that
specifies whether or not to update the offset passed by reference.
1998-06-30 05:33:11 +00:00
thorpej 808867c7cf defopt KTRACE 1998-06-25 21:17:15 +00:00
christos 02cecf686a New fktrace syscall from Darren Reed [with fixes from me] 1998-05-02 18:33:19 +00:00
mycroft f327fee4ca Fix KTROP_CLEARFILE so it does the same thing as KTROP_CLEAR (i.e. vrele()
rather than vn_close()).  Fixes PR 5357.
1998-04-28 22:27:22 +00:00
mrg f0fc5e8ca7 remove register from decl. 1998-03-29 05:19:43 +00:00
fvdl e5bc90f40c Merge with Lite2 + local changes 1998-03-01 02:20:01 +00:00
mycroft 04daee4f9c Add const where appropriate. 1997-10-19 02:00:19 +00:00
christos 09afd77655 More proto fixes 1996-02-09 18:59:18 +00:00
christos 8a5b1b92e2 First pass at prototyping 1996-02-04 02:15:01 +00:00
christos 16c4374c1f Make the ktrace code emit a record that indicates the current emulation
every time there is an attach or detach event.
1995-10-22 00:35:06 +00:00
mycroft 245f292fed Prefix names of system call implementation functions with `sys_'. 1995-10-07 06:25:19 +00:00
thorpej 60024eb978 Make system calls conform to a standard prototype and bring those
prototypes into scope.
1995-09-19 21:40:36 +00:00
christos 7de0fcfd12 Add KTR_EMUL to indicate a switch between syscall emulations.
Currently this record is emitted only on exec. Maybe it should
be emitted on ktrace() attach too.
1995-07-19 15:19:08 +00:00
cgd a046d2374e don't default return types to ints; specify them.
ktrsyscall takes (vp, code, argsize, args), and stores argsize rather
than nargs.
1995-03-26 07:48:47 +00:00
mycroft 1f5c42f54c Update types. 1995-03-09 08:55:47 +00:00
mycroft 080e194e58 Remove extra arg to vn_open(). 1994-12-14 19:03:13 +00:00
christos 1a320dc9be added extra argument in vn_open and VOP_OPEN to allow cloning devices 1994-11-14 06:01:16 +00:00
cgd 6b86130410 update for new syscall args description mechanism 1994-10-20 04:22:35 +00:00
mycroft 2f710a54ee Convert process, file, and namei lists and hash tables to use queue.h. 1994-08-30 03:04:28 +00:00
cgd cf92afd66e New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD' 1994-06-29 06:29:24 +00:00
mycroft 699bbb84b6 Update to 4.4-Lite fs code. 1994-06-08 11:28:29 +00:00
cgd 21a03cca53 mostly-machine-indepedent switch, and changes to match. also, hack init_main 1994-05-18 05:12:10 +00:00
cgd a0a7429482 lots of changes: prototype migration, move lots of variables, definitions,
and structure elements around.  kill some unnecessary type and macro
definitions.  standardize clock handling.  More changes than you'd want.
1994-05-05 05:35:42 +00:00
mycroft 21edb9924e Canonicalize all #includes. 1993-12-18 03:59:02 +00:00
cgd 9c32bc786a make allproc be volatile, and cast things accordingly.
suggested by torek, because CSRG had problems with reordering
of assignments to allproc leading to strange panics from kernels
compiled with gcc2...
1993-09-15 22:30:32 +00:00
cgd c0334ef92c break args structs out, into syscallname_args structs, so gcc2 doesn't
whine so much.
1993-07-13 22:13:15 +00:00
andrew 0e6cb953ea ANSIfications - removed all implicit function return types and argument
definitions.  Ensured that all files include "systm.h" to gain access to
general prototypes.  Casts where necessary.
1993-06-27 06:01:27 +00:00
cgd 230dcf0d05 add $Id$ strings, and clean up file headers where necessary 1993-05-20 02:54:09 +00:00
glass e0cd0652b6 removed unnecessary #ifdefing, fixed conf/files appropriately 1993-03-26 22:16:30 +00:00
cgd 61f282557f initial import of 386bsd-0.1 sources 1993-03-21 09:45:37 +00:00