/[cmucl]/src/code/lispinit.lisp
ViewVC logotype

Contents of /src/code/lispinit.lisp

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.22 - (show annotations)
Fri Aug 30 14:29:05 1991 UTC (22 years, 7 months ago) by ram
Branch: MAIN
Changes since 1.21: +1 -3 lines
Removed redundant $header.
 
1 ;;; -*- Mode: Lisp; Package: Lisp; Log: code.log -*-
2 ;;;
3 ;;; **********************************************************************
4 ;;; This code was written as part of the CMU Common Lisp project at
5 ;;; Carnegie Mellon University, and has been placed in the public domain.
6 ;;; If you want to use this code or any part of CMU Common Lisp, please contact
7 ;;; Scott Fahlman or slisp-group@cs.cmu.edu.
8 ;;;
9 (ext:file-comment
10 "$Header: /tiger/var/lib/cvsroots/cmucl/src/code/lispinit.lisp,v 1.22 1991/08/30 14:29:05 ram Exp $")
11 ;;;
12 ;;; **********************************************************************
13 ;;;
14 ;;; Initialization stuff for CMU Common Lisp, plus some other random functions
15 ;;; that we don't have any better place for.
16 ;;;
17 ;;; Written by Skef Wholey and Rob MacLachlan.
18 ;;;
19 (in-package "LISP" :use '("SYSTEM" "DEBUG"))
20
21 (export '(most-positive-fixnum most-negative-fixnum sleep
22 ++ +++ ** *** // ///))
23
24
25 (in-package "SYSTEM" :nicknames '("SYS"))
26 (export '(add-port-death-handler remove-port-death-handler sap-int
27 int-sap sap-ref-8 sap-ref-16 sap-ref-32 without-gcing
28 *in-the-compiler* compiler-version *pornography-of-death*
29 *port-receive-rights-handlers* *port-ownership-rights-handlers*
30 without-interrupts with-reply-port map-port add-port-object
31 remove-port-object make-object-set object-set-operation
32 server-message *xwindow-table* map-xwindow add-xwindow-object
33 remove-xwindow-object server-event coerce-to-key-event
34 coerce-to-motion-event coerce-to-expose-event
35 coerece-to-exposecopy-event coerce-to-focuschange-event server
36 *task-self* *task-data* *task-notify* with-interrupts
37 with-enabled-interrupts enable-interrupt ignore-interrupt
38 default-interrupt))
39
40 (in-package "EXTENSIONS")
41 (export '(quit *prompt* save-lisp gc-on gc-off *clx-server-displays*))
42
43 (in-package "LISP")
44
45 ;;; Make the error system enable interrupts.
46
47 (defconstant most-positive-fixnum #.vm:target-most-positive-fixnum
48 "The fixnum closest in value to positive infinity.")
49
50 (defconstant most-negative-fixnum #.vm:target-most-negative-fixnum
51 "The fixnum closest in value to negative infinity.")
52
53
54 ;;; Random information:
55
56 (defvar *lisp-implementation-version* "4.0(?)")
57
58 (defvar *in-the-compiler* nil
59 "Bound to T while running code inside the compiler. Macros may test this to
60 see where they are being expanded.")
61
62
63 ;;; Must be initialized in %INITIAL-FUNCTION before the DEFVAR runs...
64 (proclaim '(special *gc-inhibit* *already-maybe-gcing*
65 *need-to-collect-garbage* *gc-verbose*
66 *before-gc-hooks* *after-gc-hooks*
67 mach::*interrupts-enabled*
68 mach::*interrupt-pending*
69 c::*type-system-initialized*))
70
71
72 ;;;; Random magic specials.
73
74
75 ;;; These are filled in by Genesis.
76
77 (defvar *current-catch-block*)
78 (defvar *current-unwind-block*)
79 (defvar *free-interrupt-context-index*)
80
81
82
83 ;;;; Global ports:
84
85 (defvar *task-self* nil
86 "Port that refers to the current task.")
87
88 (defvar *task-data* nil
89 "Port used to receive data for the current task.")
90
91
92
93 ;;;; Reply port allocation.
94 ;;;
95 ;;; We maintain a global stack of reply ports which is shared among
96 ;;; all matchmaker interfaces, and could be used by other people as well.
97 ;;;
98
99 #| More stuff that will probably be drastically different.
100
101 ;;; The stack is represented by a vector, and a pointer to the first
102 ;;; free port. The stack grows upward. There is always at least one
103 ;;; NIL entry in the stack after the last allocated port.
104 ;;;
105 (defvar *reply-port-stack* (make-array 16)) ; Vector of reply ports.
106 (defvar *reply-port-pointer* 0) ; Index of first free port.
107 (defvar *reply-port-depth* 0) ; Dynamic depth in With-Reply-Port forms.
108
109 ;;; We use this as the reply port when allocating or deallocating reply
110 ;;; ports to get around potentially nasty interactions. Interrupts
111 ;;; are always off when we are doing this, so we don't have to have
112 ;;; more than one of these, or worry about unwinding.
113 (defvar *allocate-reply-port* (mach:mach-task_data))
114
115 ;;; Reset-Reply-Port-Stack -- Internal
116 ;;;
117 ;;; This is a before-save initialization which Nil's out the reply
118 ;;; port stack and sets *allocate-reply-port* back to DataPort so that
119 ;;; things initialize right at OS-Init time.
120 ;;;
121 (defun reset-reply-port-stack ()
122 (setf *reply-port-pointer* 0 *reply-port-depth* 0)
123 (fill (the simple-vector *reply-port-stack*) nil)
124 (setf *allocate-reply-port* (mach:mach-task_data)))
125 (pushnew 'reset-reply-port-stack *before-save-initializations*)
126
127 ;;; Allocate-New-Reply-Ports -- Internal
128 ;;;
129 ;;; If we run out of reply ports, we allocate another one, possibly
130 ;;; growing the stack.
131 ;;;
132 (defun allocate-new-reply-ports ()
133 (let* ((stack *reply-port-stack*)
134 (pointer *reply-port-pointer*)
135 (len (length stack)))
136 (declare (simple-vector stack) (fixnum len))
137 (when (eql pointer (1- len))
138 (let ((new (make-array (* len 2))))
139 (replace new stack :end1 len :end2 len)
140 (setf stack new *reply-port-stack* new)))
141 (setf (svref stack pointer) *allocate-reply-port*)
142 (let ((port (gr-call* mach:port_allocate (mach:mach-task_self))))
143 (gr-call mach:port_disable (mach:mach-task_self) port)
144 ;;
145 ;; Nil out the allocate reply port so it isn't used for mundane purposes.
146 (setf (svref stack pointer) nil)
147 (setf (svref stack (1- pointer)) port)
148 port)))
149
150 ;;; Reallocate-Reply-Ports -- Internal
151 ;;;
152 ;;; This function is called when With-Reply-Port finds the stack pointer
153 ;;; to be other than what it expected when it finishes. Reallocates all
154 ;;; of the ports on the stack from Start to *reply-port-pointer*. We
155 ;;; stick the *allocate-reply-port* out at *reply-port-pointer*, and
156 ;;; bind *reply-port-depth*, so that the allocation functions are happy.
157 ;;;
158 (defun reallocate-reply-ports (start)
159 (let* ((pointer *reply-port-pointer*)
160 (*reply-port-depth* pointer)
161 (stack *reply-port-stack*)
162 (save-port (svref stack pointer)))
163 (when (> start pointer)
164 (error "More ports in use than allocated???"))
165 (setf (svref stack pointer) *allocate-reply-port*)
166 (do ((i start (1+ i)))
167 ((= i pointer)
168 (setf (svref stack pointer) save-port))
169 (let ((port (svref stack i)))
170 (gr-call mach:port_deallocate *task-self* port)
171 (setf (svref stack i)
172 (gr-call* mach:port_allocate *task-self*))))))
173 |#
174
175
176 ;;;; Server stuff:
177 ;;;
178 ;;; There is a fair amount of stuff to support Matchmaker RPC servers
179 ;;; and asynchonous message service. RPC message service needs to be
180 ;;; centralized since a server must receive on all ports, and there is
181 ;;; no way for a particular server to know about all other servers
182 ;;; in the same lisp.
183 ;;;
184 ;;; The idea is that you receive the message, and then dispatch off
185 ;;; of the port received on and the message ID received. Ports correspond
186 ;;; to objects that the server manages. Message ID's correspond to the
187 ;;; operations on the objects. Objects are grouped into object sets, which
188 ;;; are sets of objects having the same operations defined.
189 ;;;
190 ;;; The same mechanism is used for handling asynchronous messages.
191 ;;;
192
193 ;;; The current implementation uses standard eq[l] hashtables for both
194 ;;; levels of dispatching. Special purpose data structures would be more
195 ;;; efficient, but the ~1ms overhead will probably be lost in the noise.
196
197 ;;;
198 ;;; Hashtable from ports to objects. Each entry is a cons (object . set).
199 ;;;
200 (defvar *port-table* (make-hash-table :test #'eql))
201
202 ;;; Hashtable from windows to objects. Each entry is a cons (object . set).
203 ;;;
204 (defvar *xwindow-table* (make-hash-table :test #'eql))
205
206
207 (defstruct (object-set
208 (:constructor make-object-set
209 (name &optional
210 (default-handler #'default-default-handler)))
211 (:print-function
212 (lambda (s stream d)
213 (declare (ignore d))
214 (format stream "#<Object Set ~S>" (object-set-name s)))))
215 name ; Name, for descriptive purposes.
216 (table (make-hash-table :test #'eq)) ; Message-ID or xevent-type --> handler fun.
217 default-handler)
218
219 (setf (documentation 'make-object-set 'function)
220 "Make an object set for use by a RPC/xevent server. Name is for
221 descriptive purposes only.")
222
223 ;;; Default-Default-Handler -- Internal
224 ;;;
225 ;;; If no such operation defined, signal an error.
226 ;;;
227 (defun default-default-handler (object)
228 #+nil
229 (alien-bind ((msg (server-message-msg server-message)))
230 (error "No operation for ID ~D on ~S in ~S."
231 (alien-access (mach:msg-id (alien-value msg))) object
232 (car (gethash (alien-access (mach:msg-localport (alien-value msg)))
233 *port-table*))))
234 (error "You lose, object: ~S" object))
235
236
237 ;;; MAP-XWINDOW and MAP-PORT return as multiple values the object and
238 ;;; object set mapped to by a xwindow or port in *xwindow-table* or
239 ;;; *port-table*.
240 ;;;
241 (macrolet ((defmapper (name table)
242 `(defun ,(intern (concatenate 'simple-string
243 "MAP-" (symbol-name name)))
244 (,name)
245 ,(format nil "Return as multiple values the object and ~
246 object-set mapped to by ~A."
247 (string-downcase (symbol-name name)))
248 (let ((temp (gethash ,name ,table)))
249 (if temp
250 (values (car temp) (cdr temp))
251 (values nil nil))))))
252 (defmapper port *port-table*)
253 (defmapper xwindow *xwindow-table*))
254
255
256 ;;; ADD-PORT-OBJECT and ADD-XWINDOW-OBJECT store an object/object-set pair
257 ;;; mapped to by a port or xwindow in either *port-table* or *xwindow-table*.
258 ;;;
259 (macrolet ((def-add-object (name table)
260 `(defun ,(intern (concatenate 'simple-string
261 "ADD-" (symbol-name name)
262 "-OBJECT"))
263 (,name object object-set)
264 ,(format nil "Add a new ~A/object/object-set association."
265 (string-downcase (symbol-name name)))
266 (check-type object-set object-set)
267 (setf (gethash ,name ,table) (cons object object-set))
268 object)))
269 (def-add-object port *port-table*)
270 (def-add-object xwindow *xwindow-table*))
271
272
273 ;;; REMOVE-PORT-OBJECT and REMOVE-XWINDOW-OBJECT remove a port or xwindow and
274 ;;; its associated object/object-set pair from *port-table* or *xwindow-table*.
275 ;;;
276 (macrolet ((def-remove-object (name table)
277 `(defun ,(intern (concatenate 'simple-string
278 "REMOVE-" (symbol-name name)
279 "-OBJECT"))
280 (,name)
281 ,(format nil
282 "Remove ~A and its associated object/object-set pair."
283 (string-downcase (symbol-name name)))
284 (remhash ,name ,table))))
285 (def-remove-object port *port-table*)
286 (def-remove-object xwindow *xwindow-table*))
287
288
289 ;;; Object-Set-Operation -- Public
290 ;;;
291 ;;; Look up the handler function for a given message ID.
292 ;;;
293 (defun object-set-operation (object-set message-id)
294 "Return the handler function in Object-Set for the operation specified by
295 Message-ID, if none, NIL is returned. The handler function is passed
296 the object. The received message is in server-Message."
297 (check-type object-set object-set)
298 (check-type message-id fixnum)
299 (values (gethash message-id (object-set-table object-set))))
300
301 ;;; %Set-Object-Set-Operation -- Internal
302 ;;;
303 ;;; The setf inverse for Object-Set-Operation.
304 ;;;
305 (defun %set-object-set-operation (object-set message-id new-value)
306 (check-type object-set object-set)
307 (check-type message-id fixnum)
308 (setf (gethash message-id (object-set-table object-set)) new-value))
309 ;;;
310 (defsetf object-set-operation %set-object-set-operation
311 "Sets the handler function for an object set operation.")
312
313
314
315 ;;;; Emergency Message Handling:
316 ;;;
317 ;;; We use the same mechanism for asynchronous messages as is used for
318 ;;; normal server messages. The only tricky part is that we don't want
319 ;;; some random server function being called when we really want to
320 ;;; receive an emergency message, so we can't receive on all ports.
321 ;;; Instead, we use MessagesWaiting to find the ports with emergency
322 ;;; messages.
323
324 #| still more noise that will be different.
325
326 (defalien waiting-ports nil (long-words 128))
327
328 ;;; Service-Emergency-Message-Interrupt -- Internal
329 ;;;
330 ;;; This is a lot like the server function, but we only receive on
331 ;;; ports with one emergency message. We only receive one message because
332 ;;; the handler function might have caused any other messages to be received.
333 ;;; When we re-enable interrupts, if any emergency messages are left, we
334 ;;; should be interrupted again.
335 ;;;
336 (defun service-emergency-message-interrupt ()
337 (grab-message-loop))
338
339 ;;;
340 ;;; This object set is used for DataPort, which is the port various magical
341 ;;; message from the kernel are received on...
342 (defvar *kernel-messages* (make-object-set "Kernel Messages"))
343
344 (compiler-let ((*alien-eval-when* '(compile eval)))
345 (defrecord port-death-msg
346 (msg mach:msg #.(record-size 'mach:msg))
347 (ex-port-tt pad (long-words 1))
348 (ex-port (signed-byte 32) (long-words 1)))
349
350 (defoperator (server-message-port-death-msg port-death-msg)
351 ((msg server-message))
352 `(alien-index (alien-value ,msg) 0 (record-size 'port-death-msg)))
353 ); Compiler-Let
354
355
356 ;;; *Port-Death-Handlers* is an EQ hash table of lists of functions that are
357 ;;; called upon port death. If a port dies that is not in the table, we print
358 ;;; out a message on *Trace-Output* describing its death. If
359 ;;; *Pornography-Of-Death* is true, we don't even print that message.
360
361 (defvar *port-death-handlers* (make-hash-table :test #'eql)
362 "Don't use this --- use Add-Port-Death-Handler instead.")
363
364 ;;; Add-Port-Death-Handler, Remove-Port-Death-Handler -- Public
365 ;;;
366 (defun add-port-death-handler (port function)
367 "Make Function a handler for port death on Port. When the port dies,
368 Function is called with the port and an argument. See also
369 Remove-Port-Death-Handler."
370 (pushnew function (gethash port *port-death-handlers*))
371 nil)
372 ;;;
373 (defun remove-port-death-handler (port function)
374 "Undoes the effect of Add-Port-Death-Handler."
375 (setf (gethash port *port-death-handlers*)
376 (delete function (gethash port *port-death-handlers*)))
377 nil)
378
379 (setf (object-set-operation *kernel-messages* mach:notify-port-deleted)
380 #'(lambda (obj)
381 (declare (ignore obj))
382 (let* ((ex-port (alien-access
383 (port-death-msg-ex-port
384 (server-message-port-death-msg server-message))))
385 (handlers (gethash ex-port *port-death-handlers*)))
386 (remhash ex-port *port-table*)
387 (remhash ex-port *port-death-handlers*)
388 (if (null handlers)
389 (handle-unclaimed-port-death ex-port)
390 (dolist (fun handlers) (funcall fun ex-port))))
391 mach:kern-success))
392
393 (defvar *pornography-of-death* t
394 "If true, nothing is said about port deaths.")
395
396 (defun handle-unclaimed-port-death (port)
397 (unless *pornography-of-death*
398 (format *trace-output* "~&[Port ~S just bit the dust.]~%" port)))
399
400 ;;; Port receive and ownership rights messages are handled simlarly, but
401 ;;; by default we deallocate the port to make sure it's really dead. This
402 ;;; gets around problems with ports being exhausted because some servers
403 ;;; don't really nuke the port when the deallocate the object.
404 ;;;
405
406 (defvar *port-receive-rights-handlers* (make-hash-table :test #'eql)
407 "This is a hashtable from ports to functions. The function is called with
408 the port as its argument when a port receive rights message for that port
409 is received from the kernel.")
410
411 (defvar *port-ownership-rights-handlers* (make-hash-table :test #'eql)
412 "This is a hashtable from ports to functions. The function is called with
413 the port as its argument when a port ownership rights message for that port
414 is received from the kernel.")
415
416 (setf (object-set-operation *kernel-messages* mach:notify-receive-rights)
417 #'(lambda (obj)
418 (declare (ignore obj))
419 (let ((ex-port (alien-access
420 (port-death-msg-ex-port
421 (server-message-port-death-msg server-message)))))
422 (funcall (gethash ex-port *port-receive-rights-handlers*
423 #'handle-unclaimed-port-rights)
424 ex-port))
425 mach:kern-success))
426
427 (setf (object-set-operation *kernel-messages* mach:notify-ownership-rights)
428 #'(lambda (obj)
429 (declare (ignore obj))
430 (let ((ex-port (alien-access
431 (port-death-msg-ex-port
432 (server-message-port-death-msg server-message)))))
433 (funcall (gethash ex-port *port-ownership-rights-handlers*
434 #'handle-unclaimed-port-rights)
435 ex-port))
436 mach:kern-success))
437
438 (defun handle-unclaimed-port-rights (port)
439 (unless *pornography-of-death*
440 (format *trace-output* "~&[Rights received for port ~D, deallocating it.]~%"
441 port))
442 (mach:port_deallocate *task-self* port)
443 (remhash port *port-receive-rights-handlers*)
444 (remhash port *port-ownership-rights-handlers*)
445 (remhash port *port-table*))
446
447 (add-port-object *task-data* nil *kernel-messages*)
448
449 ;;; Clear-Port-Tables -- Internal
450 ;;;
451 ;;; A before-save initialization which clears all of the port hashtables.
452 ;;;
453 (defun clear-port-tables ()
454 (clrhash *port-table*)
455 (clrhash *port-death-handlers*)
456 (clrhash *port-receive-rights-handlers*)
457 (clrhash *port-ownership-rights-handlers*))
458
459 (pushnew 'clear-port-tables *before-save-initializations*)
460
461 |#
462
463
464
465 ;;; %Initial-Function is called when a cold system starts up. First we zoom
466 ;;; down the *Lisp-Initialization-Functions* doing things that wanted to happen
467 ;;; at "load time." Then we initialize the various subsystems and call the
468 ;;; read-eval-print loop. The top-level Read-Eval-Print loop is executed until
469 ;;; someone (most likely the Quit function) throws to the tag
470 ;;; %End-Of-The-World. We quit this way so that all outstanding cleanup forms
471 ;;; in Unwind-Protects will get executed.
472
473 (proclaim '(special *lisp-initialization-functions*))
474
475 (eval-when (compile)
476 (defmacro print-and-call (name)
477 `(progn
478 (%primitive print ,(symbol-name name))
479 (,name))))
480
481 (def-c-variable "internal_errors_enabled" boolean)
482
483 (defun %initial-function ()
484 "Gives the world a shove and hopes it spins."
485 (setf *already-maybe-gcing* t)
486 (setf *gc-inhibit* t)
487 (setf *need-to-collect-garbage* nil)
488 (setf *gc-verbose* t)
489 (setf *before-gc-hooks* nil)
490 (setf *after-gc-hooks* nil)
491 (setf mach::*interrupts-enabled* t)
492 (setf mach::*interrupt-pending* nil)
493 (setf c::*type-system-initialized* nil)
494 (%primitive print "In initial-function, and running.")
495
496 ;; Many top-level forms call INFO, (SETF INFO).
497 (print-and-call c::globaldb-init)
498
499 ;; Some of the random top-level forms call Make-Array, which calls Subtypep...
500 (print-and-call type-init)
501
502 (setf *lisp-initialization-functions*
503 (nreverse *lisp-initialization-functions*))
504 (%primitive print "Calling top-level forms.")
505 (dolist (fun *lisp-initialization-functions*)
506 (funcall fun))
507 (makunbound '*lisp-initialization-functions*) ; So it gets GC'ed.
508
509 ;; Only do this after top level forms have run, 'cause thats where
510 ;; deftypes are.
511 (setf c::*type-system-initialized* t)
512
513 (print-and-call os-init)
514 (print-and-call filesys-init)
515 (print-and-call conditions::error-init)
516
517 (print-and-call reader-init)
518 (print-and-call backq-init)
519 (print-and-call sharp-init)
520 ;; After the various reader subsystems have done their thing to the standard
521 ;; readtable, copy it to *readtable*.
522 (setf *readtable* (copy-readtable std-lisp-readtable))
523
524 (print-and-call stream-init)
525 (print-and-call loader-init)
526 (print-and-call format-init)
527 (print-and-call package-init)
528 (print-and-call kernel::signal-init)
529 (setf (alien-access (alien-value internal_errors_enabled)) t)
530 (set-floating-point-modes :traps '(:overflow :underflow :invalid
531 :divide-by-zero))
532
533 (%primitive print "Done initializing.")
534
535 (setf *already-maybe-gcing* nil)
536 (terpri)
537 (princ "CMU Common Lisp kernel core image ")
538 (princ (lisp-implementation-version))
539 (princ ".")
540 (terpri)
541 (princ "[You are in the LISP package.]")
542 (terpri)
543 (catch '%end-of-the-world
544 (loop
545 (%top-level)
546 (write-line "You're certainly a clever child.")))
547 (mach:unix-exit 0))
548
549
550 ;;;; Initialization functions:
551
552 ;;; Reinit is called to reinitialize the world when a saved core image
553 ;;; is resumed.
554 (defvar *task-notify* NIL)
555
556 (defun reinit ()
557 (without-interrupts
558 (setf *already-maybe-gcing* t)
559 (os-init)
560 (stream-reinit)
561 (kernel::signal-init)
562 (setf (alien-access (alien-value internal_errors_enabled)) t)
563 (setf *already-maybe-gcing* nil))
564 (set-floating-point-modes :traps '(:overflow :underflow :invalid
565 :divide-by-zero))
566 #+nil
567 (mach:port_enable (mach:mach-task_self) *task-notify*)
568 #+nil
569 (add-port-object *task-notify* nil *kernel-messages*))
570
571 ;;; OS-Init initializes our operating-system interface. It sets the values
572 ;;; of the global port variables to what they should be and calls the functions
573 ;;; that set up the argument blocks for the server interfaces.
574
575 (defun os-init ()
576 (setf *task-self* (mach:mach-task_self))
577 (setf *task-data* (mach:mach-task_data))
578 (setf *task-notify* (mach:mach-task_notify)))
579
580
581 ;;; Setup-path-search-list returns a list of the directories that are
582 ;;; in the unix path environment variable. This is so that run-program
583 ;;; can be smarter about where to find a program to run.
584 (defun setup-path-search-list ()
585 (let ((path (cdr (assoc :path ext::*environment-list*))))
586 (when path
587 (do* ((i 0 (1+ p))
588 (p (position #\: path :start i)
589 (position #\: path :start i))
590 (pl ()))
591 ((null p)
592 (let ((s (subseq path i)))
593 (if (string= s "")
594 (push "default:" pl)
595 (push (concatenate 'simple-string s "/") pl)))
596 (nreverse pl))
597 (let ((s (subseq path i p)))
598 (if (string= s "")
599 (push "default:" pl)
600 (push (concatenate 'simple-string s "/") pl)))))))
601
602
603 ;;;; Miscellaneous external functions:
604
605 ;;; Quit gets us out, one way or another.
606
607 (defun quit (&optional recklessly-p)
608 "Terminates the current Lisp. Things are cleaned up unless Recklessly-P is
609 non-Nil."
610 (if recklessly-p
611 (mach:unix-exit 0)
612 (throw '%end-of-the-world nil)))
613
614
615 (defun sleep (n)
616 "This function causes execution to be suspended for N seconds. N may
617 be any non-negative, non-complex number."
618 (when (or (not (realp n))
619 (minusp n))
620 (error "Invalid argument to SLEEP: ~S.~%~
621 Must be a non-negative, non-complex number."
622 n))
623 (multiple-value-bind (sec usec)
624 (if (integerp n)
625 (values n 0)
626 (values (truncate n)
627 (truncate (* n 1000000))))
628 (mach:unix-select 0 0 0 0 sec usec))
629 nil)
630
631
632 ;;;; TOP-LEVEL loop.
633
634 (defvar / nil
635 "Holds a list of all the values returned by the most recent top-level EVAL.")
636 (defvar // nil "Gets the previous value of / when a new value is computed.")
637 (defvar /// nil "Gets the previous value of // when a new value is computed.")
638 (defvar * nil "Holds the value of the most recent top-level EVAL.")
639 (defvar ** nil "Gets the previous value of * when a new value is computed.")
640 (defvar *** nil "Gets the previous value of ** when a new value is computed.")
641 (defvar + nil "Holds the value of the most recent top-level READ.")
642 (defvar ++ nil "Gets the previous value of + when a new value is read.")
643 (defvar +++ nil "Gets the previous value of ++ when a new value is read.")
644 (defvar - nil "Holds the form curently being evaluated.")
645 (defvar *prompt* "* "
646 "The top-level prompt string. This also may be a function of no arguments
647 that returns a simple-string.")
648 (defvar *in-top-level-catcher* nil
649 "True if we are within the Top-Level-Catcher. This is used by interrupt
650 handlers to see whether it is o.k. to throw.")
651
652 (defun interactive-eval (form)
653 "Evaluate FORM, returning whatever it returns but adjust ***, **, *, +++, ++,
654 +, ///, //, /, and -."
655 (setf - form)
656 (let ((results (multiple-value-list (eval form))))
657 (setf /// //
658 // /
659 / results
660 *** **
661 ** *
662 * (car results)))
663 (setf +++ ++
664 ++ +
665 + -)
666 (unless (boundp '*)
667 ;; The bogon returned an unbound marker.
668 (setf * nil)
669 (cerror "Go on with * set to NIL."
670 "EVAL returned an unbound marker."))
671 (values-list /))
672
673
674 (defconstant eofs-before-quit 10)
675
676 (defun %top-level ()
677 "Top-level READ-EVAL-PRINT loop. Do not call this."
678 (let ((* nil) (** nil) (*** nil)
679 (- nil) (+ nil) (++ nil) (+++ nil)
680 (/// nil) (// nil) (/ nil)
681 (magic-eof-cookie (cons :eof nil))
682 (number-of-eofs 0))
683 (loop
684 (with-simple-restart (abort "Return to Top-Level.")
685 (catch 'top-level-catcher
686 (mach:unix-sigsetmask 0)
687 (let ((*in-top-level-catcher* t))
688 (loop
689 (fresh-line)
690 (princ (if (functionp *prompt*)
691 (funcall *prompt*)
692 *prompt*))
693 (force-output)
694 (let ((form (read *standard-input* nil magic-eof-cookie)))
695 (cond ((not (eq form magic-eof-cookie))
696 (let ((results
697 (multiple-value-list (interactive-eval form))))
698 (dolist (result results)
699 (fresh-line)
700 (prin1 result)))
701 (setf number-of-eofs 0))
702 ((eql (incf number-of-eofs) 1)
703 (let ((stream (make-synonym-stream '*terminal-io*)))
704 (setf *standard-input* stream)
705 (setf *standard-output* stream)
706 (format t "~&Received EOF on *standard-input*, ~
707 switching to *terminal-io*.~%")))
708 ((> number-of-eofs eofs-before-quit)
709 (format t "~&Received more than ~D EOFs; Aborting.~%"
710 eofs-before-quit)
711 (quit))
712 (t
713 (format t "~&Received EOF.~%")))))))))))
714
715
716
717 ;;; %Halt -- Interface
718 ;;;
719 ;;; A convenient way to get into the assembly level debugger.
720 ;;;
721 (defun %halt ()
722 (%primitive halt))

  ViewVC Help
Powered by ViewVC 1.1.5