tests/threads.impure.lisp

   1 ;;;; miscellaneous tests of thread stuff
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; While most of SBCL is derived from the CMU CL system, the test
   7 ;;;; files (like this one) were written from scratch after the fork
   8 ;;;; from CMU CL.
   9 ;;;
  10 ;;;; This software is in the public domain and is provided with
  11 ;;;; absoluely no warranty. See the COPYING and CREDITS files for
  12 ;;;; more information.
  13
  14 (in-package "SB-THREAD") ; this is white-box testing, really
  15
  16 (use-package :test-util)
  17
  18 (defun wait-for-threads (threads)
  19   (loop while (some #'sb-thread:thread-alive-p threads) do (sleep 0.01)))
  20
  21 (assert (eql 1 (length (list-all-threads))))
  22
  23 (assert (eq *current-thread*
  24             (find (thread-name *current-thread*) (list-all-threads)
  25                   :key #'thread-name :test #'equal)))
  26
  27 (assert (thread-alive-p *current-thread*))
  28
  29 (let ((a 0))
  30   (interrupt-thread *current-thread* (lambda () (setq a 1)))
  31   (assert (eql a 1)))
  32
  33 (let ((spinlock (make-spinlock)))
  34   (with-spinlock (spinlock)))
  35
  36 (let ((mutex (make-mutex)))
  37   (with-mutex (mutex)
  38     mutex))
  39
  40 #-sb-thread (sb-ext:quit :unix-status 104)
  41
  42 (let ((old-threads (list-all-threads))
  43       (thread (make-thread (lambda ()
  44                              (assert (find *current-thread* *all-threads*))
  45                              (sleep 2))))
  46       (new-threads (list-all-threads)))
  47   (assert (thread-alive-p thread))
  48   (assert (eq thread (first new-threads)))
  49   (assert (= (1+ (length old-threads)) (length new-threads)))
  50   (sleep 3)
  51   (assert (not (thread-alive-p thread))))
  52
  53 ;;; We had appalling scaling properties for a while.  Make sure they
  54 ;;; don't reappear.
  55 (defun scaling-test (function &optional (nthreads 5))
  56   "Execute FUNCTION with NTHREADS lurking to slow it down."
  57   (let ((queue (sb-thread:make-waitqueue))
  58         (mutex (sb-thread:make-mutex)))
  59     ;; Start NTHREADS idle threads.
  60     (dotimes (i nthreads)
  61       (sb-thread:make-thread (lambda ()
  62                                (with-mutex (mutex)
  63                                  (sb-thread:condition-wait queue mutex))
  64                                (sb-ext:quit))))
  65     (let ((start-time (get-internal-run-time)))
  66       (funcall function)
  67       (prog1 (- (get-internal-run-time) start-time)
  68         (sb-thread:condition-broadcast queue)))))
  69 (defun fact (n)
  70   "A function that does work with the CPU."
  71   (if (zerop n) 1 (* n (fact (1- n)))))
  72 (let ((work (lambda () (fact 15000))))
  73   (let ((zero (scaling-test work 0))
  74         (four (scaling-test work 4)))
  75     ;; a slightly weak assertion, but good enough for starters.
  76     (assert (< four (* 1.5 zero)))))
  77
  78 ;;; For one of the interupt-thread tests, we want a foreign function
  79 ;;; that does not make syscalls
  80
  81 (with-open-file (o "threads-foreign.c" :direction :output :if-exists :supersede)
  82   (format o "void loop_forever() { while(1) ; }~%"))
  83 (sb-ext:run-program
  84  "cc"
  85  (or #+linux '("-shared" "-o" "threads-foreign.so" "threads-foreign.c")
  86      (error "Missing shared library compilation options for this platform"))
  87  :search t)
  88 (sb-alien:load-shared-object "threads-foreign.so")
  89 (sb-alien:define-alien-routine loop-forever sb-alien:void)
  90
  91
  92 ;;; elementary "can we get a lock and release it again"
  93 (let ((l (make-mutex :name "foo"))
  94       (p *current-thread*))
  95   (assert (eql (mutex-value l) nil) nil "1")
  96   (sb-thread:get-mutex l)
  97   (assert (eql (mutex-value l) p) nil "3")
  98   (sb-thread:release-mutex l)
  99   (assert (eql (mutex-value l) nil) nil "5"))
 100
 101 (labels ((ours-p (value)
 102            (eq *current-thread* value)))
 103   (let ((l (make-mutex :name "rec")))
 104     (assert (eql (mutex-value l) nil) nil "1")
 105     (sb-thread:with-recursive-lock (l)
 106       (assert (ours-p (mutex-value l)) nil "3")
 107       (sb-thread:with-recursive-lock (l)
 108         (assert (ours-p (mutex-value l)) nil "4"))
 109       (assert (ours-p (mutex-value l)) nil "5"))
 110     (assert (eql (mutex-value l) nil) nil "6")))
 111
 112 (with-test (:name (:mutex :nesting-mutex-and-recursive-lock))
 113   (let ((l (make-mutex :name "a mutex")))
 114     (with-mutex (l)
 115       (with-recursive-lock (l)))))
 116
 117 (let ((l (make-spinlock :name "spinlock"))
 118       (p *current-thread*))
 119   (assert (eql (spinlock-value l) 0) nil "1")
 120   (with-spinlock (l)
 121     (assert (eql (spinlock-value l) p) nil "2"))
 122   (assert (eql (spinlock-value l) 0) nil "3"))
 123
 124 ;; test that SLEEP actually sleeps for at least the given time, even
 125 ;; if interrupted by another thread exiting/a gc/anything
 126 (let ((start-time (get-universal-time)))
 127   (make-thread (lambda () (sleep 1) (sb-ext:gc :full t)))
 128   (sleep 5)
 129   (assert (>= (get-universal-time) (+ 5 start-time))))
 130
 131
 132 (let ((queue (make-waitqueue :name "queue"))
 133       (lock (make-mutex :name "lock"))
 134       (n 0))
 135   (labels ((in-new-thread ()
 136              (with-mutex (lock)
 137                (assert (eql (mutex-value lock) *current-thread*))
 138                (format t "~A got mutex~%" *current-thread*)
 139                ;; now drop it and sleep
 140                (condition-wait queue lock)
 141                ;; after waking we should have the lock again
 142                (assert (eql (mutex-value lock) *current-thread*))
 143                (assert (eql n 1))
 144                (decf n))))
 145     (make-thread #'in-new-thread)
 146     (sleep 2)                           ; give it  a chance to start
 147     ;; check the lock is free while it's asleep
 148     (format t "parent thread ~A~%" *current-thread*)
 149     (assert (eql (mutex-value lock) nil))
 150     (with-mutex (lock)
 151       (incf n)
 152       (condition-notify queue))
 153     (sleep 1)))
 154
 155 (let ((queue (make-waitqueue :name "queue"))
 156       (lock (make-mutex :name "lock")))
 157   (labels ((ours-p (value)
 158              (eq *current-thread* value))
 159            (in-new-thread ()
 160              (with-recursive-lock (lock)
 161                (assert (ours-p (mutex-value lock)))
 162                (format t "~A got mutex~%" (mutex-value lock))
 163                ;; now drop it and sleep
 164                (condition-wait queue lock)
 165                ;; after waking we should have the lock again
 166                (format t "woken, ~A got mutex~%" (mutex-value lock))
 167                (assert (ours-p (mutex-value lock))))))
 168     (make-thread #'in-new-thread)
 169     (sleep 2)                           ; give it  a chance to start
 170     ;; check the lock is free while it's asleep
 171     (format t "parent thread ~A~%" *current-thread*)
 172     (assert (eql (mutex-value lock) nil))
 173     (with-recursive-lock (lock)
 174       (condition-notify queue))
 175     (sleep 1)))
 176
 177 (let ((mutex (make-mutex :name "contended")))
 178   (labels ((run ()
 179              (let ((me *current-thread*))
 180                (dotimes (i 100)
 181                  (with-mutex (mutex)
 182                    (sleep .03)
 183                    (assert (eql (mutex-value mutex) me)))
 184                  (assert (not (eql (mutex-value mutex) me))))
 185                (format t "done ~A~%" *current-thread*))))
 186     (let ((kid1 (make-thread #'run))
 187           (kid2 (make-thread #'run)))
 188       (format t "contention ~A ~A~%" kid1 kid2)
 189       (wait-for-threads (list kid1 kid2)))))
 190
 191 ;;; semaphores
 192
 193 (defmacro raises-timeout-p (&body body)
 194   `(handler-case (progn (progn ,@body) nil)
 195     (sb-ext:timeout () t)))
 196
 197 (with-test (:name (:semaphore :wait-forever))
 198   (let ((sem (make-semaphore :count 0)))
 199     (assert (raises-timeout-p
 200               (sb-ext:with-timeout 0.1
 201                 (wait-on-semaphore sem))))))
 202
 203 (with-test (:name (:semaphore :initial-count))
 204   (let ((sem (make-semaphore :count 1)))
 205     (sb-ext:with-timeout 0.1
 206       (wait-on-semaphore sem))))
 207
 208 (with-test (:name (:semaphore :wait-then-signal))
 209   (let ((sem (make-semaphore))
 210         (signalled-p nil))
 211     (make-thread (lambda ()
 212                    (sleep 0.1)
 213                    (setq signalled-p t)
 214                    (signal-semaphore sem)))
 215     (wait-on-semaphore sem)
 216     (assert signalled-p)))
 217
 218 (with-test (:name (:semaphore :signal-then-wait))
 219   (let ((sem (make-semaphore))
 220         (signalled-p nil))
 221     (make-thread (lambda ()
 222                    (signal-semaphore sem)
 223                    (setq signalled-p t)))
 224     (loop until signalled-p)
 225     (wait-on-semaphore sem)
 226     (assert signalled-p)))
 227
 228 (with-test (:name (:semaphore :multiple-signals))
 229   (let* ((sem (make-semaphore :count 5))
 230          (threads (loop repeat 20
 231                         collect (make-thread (lambda ()
 232                                                (wait-on-semaphore sem))))))
 233     (flet ((count-live-threads ()
 234              (count-if #'thread-alive-p threads)))
 235       (sleep 0.5)
 236       (assert (= 15 (count-live-threads)))
 237       (signal-semaphore sem 10)
 238       (sleep 0.5)
 239       (assert (= 5 (count-live-threads)))
 240       (signal-semaphore sem 3)
 241       (sleep 0.5)
 242       (assert (= 2 (count-live-threads)))
 243       (signal-semaphore sem 4)
 244       (sleep 0.5)
 245       (assert (= 0 (count-live-threads))))))
 246
 247 (format t "~&semaphore tests done~%")
 248
 249 (defun test-interrupt (function-to-interrupt &optional quit-p)
 250   (let ((child  (make-thread function-to-interrupt)))
 251     ;;(format t "gdb ./src/runtime/sbcl ~A~%attach ~A~%" child child)
 252     (sleep 2)
 253     (format t "interrupting child ~A~%" child)
 254     (interrupt-thread child
 255                       (lambda ()
 256                         (format t "child pid ~A~%" *current-thread*)
 257                         (when quit-p (sb-ext:quit))))
 258     (sleep 1)
 259     child))
 260
 261 ;; separate tests for (a) interrupting Lisp code, (b) C code, (c) a syscall,
 262 ;; (d) waiting on a lock, (e) some code which we hope is likely to be
 263 ;; in pseudo-atomic
 264
 265 (let ((child (test-interrupt (lambda () (loop)))))  (terminate-thread child))
 266
 267 (test-interrupt #'loop-forever :quit)
 268
 269 (let ((child (test-interrupt (lambda () (loop (sleep 2000))))))
 270   (terminate-thread child)
 271   (wait-for-threads (list child)))
 272
 273 (let ((lock (make-mutex :name "loctite"))
 274       child)
 275   (with-mutex (lock)
 276     (setf child (test-interrupt
 277                  (lambda ()
 278                    (with-mutex (lock)
 279                      (assert (eql (mutex-value lock) *current-thread*)))
 280                    (assert (not (eql (mutex-value lock) *current-thread*)))
 281                    (sleep 10))))
 282     ;;hold onto lock for long enough that child can't get it immediately
 283     (sleep 5)
 284     (interrupt-thread child (lambda () (format t "l ~A~%" (mutex-value lock))))
 285     (format t "parent releasing lock~%"))
 286   (terminate-thread child)
 287   (wait-for-threads (list child)))
 288
 289 (format t "~&locking test done~%")
 290
 291 (defun alloc-stuff () (copy-list '(1 2 3 4 5)))
 292
 293 (progn
 294   (let ((thread (sb-thread:make-thread (lambda () (loop (alloc-stuff))))))
 295     (let ((killers
 296            (loop repeat 4 collect
 297                  (sb-thread:make-thread
 298                   (lambda ()
 299                     (loop repeat 25 do
 300                           (sleep (random 0.1d0))
 301                           (princ ".")
 302                           (force-output)
 303                           (sb-thread:interrupt-thread thread (lambda ()))))))))
 304       (wait-for-threads killers)
 305       (sb-thread:terminate-thread thread)
 306       (wait-for-threads (list thread))))
 307   (sb-ext:gc :full t))
 308
 309 (format t "~&multi interrupt test done~%")
 310
 311 (let ((c (make-thread (lambda () (loop (alloc-stuff))))))
 312   ;; NB this only works on x86: other ports don't have a symbol for
 313   ;; pseudo-atomic atomicity
 314   (dotimes (i 100)
 315     (sleep (random 0.1d0))
 316     (interrupt-thread c
 317                       (lambda ()
 318                         (princ ".") (force-output)
 319                         (assert (thread-alive-p *current-thread*))
 320                         (assert (zerop SB-KERNEL:*PSEUDO-ATOMIC-ATOMIC*)))))
 321   (terminate-thread c)
 322   (wait-for-threads (list c)))
 323
 324 (format t "~&interrupt test done~%")
 325
 326 (defparameter *interrupt-count* 0)
 327
 328 (declaim (notinline check-interrupt-count))
 329 (defun check-interrupt-count (i)
 330   (declare (optimize (debug 1) (speed 1)))
 331   ;; This used to lose if eflags were not restored after an interrupt.
 332   (unless (typep i 'fixnum)
 333     (error "!!!!!!!!!!!")))
 334
 335 (let ((c (make-thread
 336           (lambda ()
 337             (handler-bind ((error #'(lambda (cond)
 338                                       (princ cond)
 339                                       (sb-debug:backtrace
 340                                        most-positive-fixnum))))
 341               (loop (check-interrupt-count *interrupt-count*)))))))
 342   (let ((func (lambda ()
 343                 (princ ".")
 344                 (force-output)
 345                 (sb-impl::atomic-incf/symbol *interrupt-count*))))
 346     (setq *interrupt-count* 0)
 347     (dotimes (i 100)
 348       (sleep (random 0.1d0))
 349       (interrupt-thread c func))
 350     (loop until (= *interrupt-count* 100) do (sleep 0.1))
 351     (terminate-thread c)
 352     (wait-for-threads (list c))))
 353
 354 (format t "~&interrupt count test done~%")
 355
 356 (let (a-done b-done)
 357   (make-thread (lambda ()
 358                  (dotimes (i 100)
 359                    (sb-ext:gc) (princ "\\") (force-output))
 360                  (setf a-done t)))
 361   (make-thread (lambda ()
 362                  (dotimes (i 25)
 363                    (sb-ext:gc :full t)
 364                    (princ "/") (force-output))
 365                  (setf b-done t)))
 366   (loop
 367    (when (and a-done b-done) (return))
 368    (sleep 1)))
 369
 370 (terpri)
 371
 372 (defun waste (&optional (n 100000))
 373   (loop repeat n do (make-string 16384)))
 374
 375 (loop for i below 100 do
 376       (princ "!")
 377       (force-output)
 378       (sb-thread:make-thread
 379        #'(lambda ()
 380            (waste)))
 381       (waste)
 382       (sb-ext:gc))
 383
 384 (terpri)
 385
 386 (defparameter *aaa* nil)
 387 (loop for i below 100 do
 388       (princ "!")
 389       (force-output)
 390       (sb-thread:make-thread
 391        #'(lambda ()
 392            (let ((*aaa* (waste)))
 393              (waste))))
 394       (let ((*aaa* (waste)))
 395         (waste))
 396       (sb-ext:gc))
 397
 398 (format t "~&gc test done~%")
 399
 400 ;; this used to deadlock on session-lock
 401 (sb-thread:make-thread (lambda () (sb-ext:gc)))
 402 ;; expose thread creation races by exiting quickly
 403 (sb-thread:make-thread (lambda ()))
 404
 405 (defun exercise-syscall (fn reference-errno)
 406   (sb-thread:make-thread
 407    (lambda ()
 408      (loop do
 409           (funcall fn)
 410           (let ((errno (sb-unix::get-errno)))
 411             (sleep (random 0.1d0))
 412             (unless (eql errno reference-errno)
 413               (format t "Got errno: ~A (~A) instead of ~A~%"
 414                       errno
 415                       (sb-unix::strerror)
 416                       reference-errno)
 417               (force-output)
 418               (sb-ext:quit :unix-status 1)))))))
 419
 420 (let* ((nanosleep-errno (progn
 421                           (sb-unix:nanosleep -1 0)
 422                           (sb-unix::get-errno)))
 423        (open-errno (progn
 424                      (open "no-such-file"
 425                            :if-does-not-exist nil)
 426                      (sb-unix::get-errno)))
 427        (threads
 428         (list
 429          (exercise-syscall (lambda () (sb-unix:nanosleep -1 0)) nanosleep-errno)
 430          (exercise-syscall (lambda () (open "no-such-file"
 431                                             :if-does-not-exist nil))
 432                            open-errno)
 433          (sb-thread:make-thread (lambda () (loop (sb-ext:gc) (sleep 1)))))))
 434   (sleep 10)
 435   (princ "terminating threads")
 436   (dolist (thread threads)
 437     (sb-thread:terminate-thread thread)))
 438
 439 (format t "~&errno test done~%")
 440
 441 (loop repeat 100 do
 442       (let ((thread (sb-thread:make-thread (lambda () (sleep 0.1)))))
 443         (sb-thread:interrupt-thread
 444          thread
 445          (lambda ()
 446            (assert (find-restart 'sb-thread:terminate-thread))))))
 447
 448 (sb-ext:gc :full t)
 449
 450 (format t "~&thread startup sigmask test done~%")
 451
 452 (sb-debug::enable-debugger)
 453 (let* ((main-thread *current-thread*)
 454        (interruptor-thread
 455         (make-thread (lambda ()
 456                        (sleep 2)
 457                        (interrupt-thread main-thread #'break)
 458                        (sleep 2)
 459                        (interrupt-thread main-thread #'continue)))))
 460   (with-session-lock (*session*)
 461     (sleep 3))
 462   (loop while (thread-alive-p interruptor-thread)))
 463
 464 (format t "~&session lock test done~%")
 465
 466 (loop repeat 20 do
 467       (wait-for-threads
 468        (loop for i below 100 collect
 469              (sb-thread:make-thread (lambda ())))))
 470
 471 (format t "~&creation test done~%")
 472
 473 ;; watch out for *current-thread* being the parent thread after exit
 474 (let* (sap
 475        (thread (sb-thread:make-thread
 476                 (lambda ()
 477                   (setq sap (thread-sap-for-id
 478                              (thread-os-thread *current-thread*)))))))
 479   (wait-for-threads (list thread))
 480   (assert (null (symbol-value-in-thread 'sb-thread:*current-thread*
 481                                         sap))))
 482
 483 ;; interrupt handlers are per-thread with pthreads, make sure the
 484 ;; handler installed in one thread is global
 485 (sb-thread:make-thread
 486  (lambda ()
 487    (sb-ext:run-program "sleep" '("1") :search t :wait nil)))
 488
 489 (with-test (:name (:thread-start :dynamic-values-and-gc))
 490   (let ((gc-thread (sb-thread:make-thread (lambda ()
 491                                             (loop (sleep (random 0.2))
 492                                                   (sb-ext:gc :full t))))))
 493     (wait-for-threads
 494      (loop for i below 3000
 495            when (zerop (mod i 30))
 496            do (princ ".")
 497            collect
 498            (let ((*x* (lambda ())))
 499              (declare (special *x*))
 500              (sb-thread:make-thread (lambda () (functionp *x*))))))
 501     (sb-thread:terminate-thread gc-thread)
 502     (terpri)))
 503
 504 #|  ;; a cll post from eric marsden
 505 | (defun crash ()
 506 |   (setq *debugger-hook*
 507 |         (lambda (condition old-debugger-hook)
 508 |           (debug:backtrace 10)
 509 |           (unix:unix-exit 2)))
 510 |   #+live-dangerously
 511 |   (mp::start-sigalrm-yield)
 512 |   (flet ((roomy () (loop (with-output-to-string (*standard-output*) (room)))))
 513 |     (mp:make-process #'roomy)
 514 |     (mp:make-process #'roomy)))
 515 |#