CMUCL
OpenMCL
CLISP (recent versions only)
+ ABCL (recent versions only)
Note that every release isn't tested with every possible host
compiler. You're most likely to get a clean build with SBCL itself
("src/code/alloc" :not-host)
("src/code/target-thread" :not-host)
- #!+sb-thread
- ("src/code/target-multithread" :not-host)
- #!-sb-thread
- ("src/code/target-unithread" :not-host)
;; defines SB!DI:DO-DEBUG-FUN-BLOCKS, needed by target-disassem.lisp
("src/code/gc" :not-host)
("src/code/purify" :not-host)
not allow Lisp control of the scheduler. This is found in the
SB-THREAD package.
-This requires x86 and Linux kernel 2.6 or systems with NPTL backports.
+This requires x86/x86-64 and Linux kernel 2.6 or systems with NPTL
+backports.
@menu
+* Threading basics::
* Special Variables::
* Mutex Support::
* Waitqueue/condition variables::
* Implementation (Linux x86)::
@end menu
+@node Threading basics
+@comment node-name, next, previous, up
+@section Threading basics
+
+@lisp
+(make-thread (lambda () (write-line "Hello, world")))
+@end lisp
+
+@include struct-sb-thread-thread.texinfo
+@include var-sb-thread-star-current-thread-star.texinfo
+@include fun-sb-thread-make-thread.texinfo
+@include fun-sb-thread-thread-alive-p.texinfo
+@include fun-sb-thread-list-all-threads.texinfo
+@include condition-sb-thread-interrupt-thread-error.texinfo
+@include fun-sb-thread-interrupt-thread-error-thread.texinfo
+@include fun-sb-thread-interrupt-thread-error-errno.texinfo
+@include fun-sb-thread-interrupt-thread.texinfo
+@include fun-sb-thread-terminate-thread.texinfo
+
@node Special Variables
@comment node-name, next, previous, up
@section Special Variables
initial values in a new thread are taken from the thread that created it.
@end itemize
+The last point means that
+
+@lisp
+(defparameter *x* 0)
+(let ((*x* 1))
+ (sb-thread:make-thread (lambda () (print *x*))))
+@end lisp
+
+prints @code{1}.
+
@node Mutex Support
@comment node-name, next, previous, up
@section Mutex Support
(make-thread #'thread-fn)
(make-thread #'thread-fn)
-
@end lisp
+@include struct-sb-thread-mutex.texinfo
+@include fun-sb-thread-make-mutex.texinfo
+@include fun-sb-thread-mutex-name.texinfo
+@include fun-sb-thread-mutex-value.texinfo
+@include fun-sb-thread-get-mutex.texinfo
+@include fun-sb-thread-release-mutex.texinfo
+@include macro-sb-thread-with-mutex.texinfo
+@include macro-sb-thread-with-recursive-lock.texinfo
+
@node Waitqueue/condition variables
@comment node-name, next, previous, up
@section Waitqueue/condition variables
(make-thread #'writer)
(make-thread #'reader)
(make-thread #'reader)
-
@end lisp
+@include struct-sb-thread-waitqueue.texinfo
+@include fun-sb-thread-make-waitqueue.texinfo
+@include fun-sb-thread-waitqueue-name.texinfo
+@include fun-sb-thread-condition-wait.texinfo
+@include fun-sb-thread-condition-notify.texinfo
+@include fun-sb-thread-condition-broadcast.texinfo
+
@node Sessions/Debugging
@comment node-name, next, previous, up
@section Sessions/Debugging
@node Implementation (Linux x86)
@comment node-name, next, previous, up
-@section Implementation (Linux x86)
-
-On Linux x86, threading is implemented using @code{clone()} and does
-not involve pthreads. This is not because there is anything wrong
-with pthreads @emph{per se}, but there is plenty wrong (from our
-perspective) with LinuxThreads. SBCL threads are mapped 1:1 onto
-Linux tasks which share a VM but nothing else - each has its own
-process id and can be seen in e.g. @command{ps} output.
-
-Per-thread local bindings for special variables is achieved using the
-%fs segment register to point to a per-thread storage area. This may
-cause interesting results if you link to foreign code that expects
-threading or creates new threads, and the thread library in question
-uses %fs in an incompatible way.
+@section Implementation (Linux x86/x86-64)
+
+Threading is implemented using pthreads and some Linux specific bits
+like futexes.
+
+On x86 the per-thread local bindings for special variables is achieved
+using the %fs segment register to point to a per-thread storage area.
+This may cause interesting results if you link to foreign code that
+expects threading or creates new threads, and the thread library in
+question uses %fs in an incompatible way. On x86-64 the r12 register
+has a similar role.
Queues require the @code{sys_futex()} system call to be available:
this is the reason for the NPTL requirement. We test at runtime that
:name "SB!THREAD"
:use ("CL" "SB!ALIEN" "SB!INT")
:doc "public (but low-level): native thread support"
- :export ("*CURRENT-THREAD*" "MAKE-THREAD" "THREAD"
+ :export ("*CURRENT-THREAD*" "THREAD" "MAKE-THREAD"
"THREAD-NAME" "THREAD-ALIVE-P"
"LIST-ALL-THREADS"
- "MAKE-LISTENER-THREAD" "DESTROY-THREAD" "TERMINATE-THREAD"
- "INTERRUPT-THREAD" "WITH-RECURSIVE-LOCK"
- "MUTEX" "MAKE-MUTEX" "GET-MUTEX" "RELEASE-MUTEX" "WITH-MUTEX"
- "MUTEX-VALUE" "WAITQUEUE" "MAKE-WAITQUEUE"
+ "INTERRUPT-THREAD-ERROR"
+ "INTERRUPT-THREAD-ERROR-THREAD"
+ "INTERRUPT-THREAD-ERROR-ERRNO"
+ "INTERRUPT-THREAD" "TERMINATE-THREAD" "DESTROY-THREAD"
+ "MUTEX" "MAKE-MUTEX" "MUTEX-NAME" "MUTEX-VALUE"
+ "GET-MUTEX" "RELEASE-MUTEX" "WITH-MUTEX"
+ "WITH-RECURSIVE-LOCK"
+ "WAITQUEUE" "MAKE-WAITQUEUE" "WAITQUEUE-NAME"
"CONDITION-WAIT" "CONDITION-NOTIFY" "CONDITION-BROADCAST"
- "WITH-RECURSIVE-LOCK" "RELEASE-FOREGROUND" "WITH-NEW-SESSION"))
+ "MAKE-LISTENER-THREAD"
+ "RELEASE-FOREGROUND" "WITH-NEW-SESSION"))
#s(sb-cold:package-data
:name "SB!LOOP"
+++ /dev/null
-;;;; support for threads in the target machine
-
-;;;; This software is part of the SBCL system. See the README file for
-;;;; more information.
-;;;;
-;;;; This software is derived from the CMU CL system, which was
-;;;; written at Carnegie Mellon University and released into the
-;;;; public domain. The software is in the public domain and is
-;;;; provided with absolutely no warranty. See the COPYING and CREDITS
-;;;; files for more information.
-
-(in-package "SB!THREAD")
-
-(define-alien-routine ("create_thread" %create-thread)
- system-area-pointer
- (lisp-fun-address unsigned-long))
-
-(define-alien-routine reap-dead-thread void
- (thread-sap system-area-pointer))
-
-;;;; queues, locks
-
-;; spinlocks use 0 as "free" value: higher-level locks use NIL
-(declaim (inline get-spinlock release-spinlock))
-
-(defun get-spinlock (lock offset new-value)
- (declare (optimize (speed 3) (safety 0)))
- ;; %instance-set-conditional can test for 0 (which is a fixnum) and
- ;; store any value
- (loop until
- (eql (sb!vm::%instance-set-conditional lock offset 0 new-value) 0)))
-
-(defun release-spinlock (lock offset)
- (declare (optimize (speed 3) (safety 0)))
- ;; %instance-set-conditional cannot compare arbitrary objects
- ;; meaningfully, so
- ;; (sb!vm::%instance-set-conditional lock offset our-value 0)
- ;; does not work for bignum thread ids.
- (sb!vm::%instance-set lock offset 0))
-
-(defmacro with-spinlock ((queue) &body body)
- `(unwind-protect
- (progn
- (get-spinlock ,queue 2 *current-thread*)
- ,@body)
- (release-spinlock ,queue 2)))
-
-
-;;;; the higher-level locking operations are based on waitqueues
-
-(declaim (inline waitqueue-data-address mutex-value-address))
-
-(defstruct waitqueue
- (name nil :type (or null simple-string))
- (lock 0)
- (data nil))
-
-;;; The bare 4 here and 5 below are offsets of the slots in the struct.
-;;; There ought to be some better way to get these numbers
-(defun waitqueue-data-address (lock)
- (declare (optimize (speed 3)))
- (sb!ext:truly-the
- (unsigned-byte 32)
- (+ (sb!kernel:get-lisp-obj-address lock)
- (- (* 4 sb!vm:n-word-bytes) sb!vm:instance-pointer-lowtag))))
-
-(defstruct (mutex (:include waitqueue))
- (value nil))
-
-(defun mutex-value-address (lock)
- (declare (optimize (speed 3)))
- (sb!ext:truly-the
- (unsigned-byte 32)
- (+ (sb!kernel:get-lisp-obj-address lock)
- (- (* 5 sb!vm:n-word-bytes) sb!vm:instance-pointer-lowtag))))
-
-(declaim (inline futex-wait futex-wake))
-(sb!alien:define-alien-routine
- "futex_wait" int (word unsigned-long) (old-value unsigned-long))
-(sb!alien:define-alien-routine
- "futex_wake" int (word unsigned-long) (n unsigned-long))
-
-
-;;;; mutex
-
-(defun get-mutex (lock &optional new-value (wait-p t))
- "Acquire LOCK, setting it to NEW-VALUE or some suitable default value
-if NIL. If WAIT-P is non-NIL and the lock is in use, sleep until it
-is available"
- (declare (type mutex lock) (optimize (speed 3)))
- (let (old)
- (unless new-value (setf new-value *current-thread*))
- (when (eql new-value (mutex-value lock))
- (warn "recursive lock attempt ~S~%" lock)
- (format *debug-io* "Thread: ~A~%" *current-thread*)
- (sb!debug:backtrace most-positive-fixnum *debug-io*)
- (force-output *debug-io*))
- (loop
- (unless
- (setf old (sb!vm::%instance-set-conditional lock 4 nil new-value))
- (return t))
- (unless wait-p (return nil))
- (futex-wait (mutex-value-address lock)
- (sb!kernel:get-lisp-obj-address old)))))
-
-(defun release-mutex (lock)
- (declare (type mutex lock))
- (setf (mutex-value lock) nil)
- (futex-wake (mutex-value-address lock) 1))
-
-;;;; condition variables
-
-(defun condition-wait (queue lock)
- "Atomically release LOCK and enqueue ourselves on QUEUE. Another
-thread may subsequently notify us using CONDITION-NOTIFY, at which
-time we reacquire LOCK and return to the caller."
- (assert lock)
- (let ((value (mutex-value lock)))
- (unwind-protect
- (let ((me *current-thread*))
- ;; XXX we should do something to ensure that the result of this setf
- ;; is visible to all CPUs
- (setf (waitqueue-data queue) me)
- (release-mutex lock)
- ;; Now we go to sleep using futex-wait. If anyone else
- ;; manages to grab LOCK and call CONDITION-NOTIFY during
- ;; this comment, it will change queue->data, and so
- ;; futex-wait returns immediately instead of sleeping.
- ;; Ergo, no lost wakeup
- (futex-wait (waitqueue-data-address queue)
- (sb!kernel:get-lisp-obj-address me)))
- ;; If we are interrupted while waiting, we should do these things
- ;; before returning. Ideally, in the case of an unhandled signal,
- ;; we should do them before entering the debugger, but this is
- ;; better than nothing.
- (get-mutex lock value))))
-
-(defun condition-notify (queue)
- "Notify one of the processes waiting on QUEUE"
- (let ((me *current-thread*))
- ;; no problem if >1 thread notifies during the comment in
- ;; condition-wait: as long as the value in queue-data isn't the
- ;; waiting thread's id, it matters not what it is
- ;; XXX we should do something to ensure that the result of this setf
- ;; is visible to all CPUs
- (setf (waitqueue-data queue) me)
- (futex-wake (waitqueue-data-address queue) 1)))
-
-(defun condition-broadcast (queue)
- (let ((me *current-thread*))
- (setf (waitqueue-data queue) me)
- (futex-wake (waitqueue-data-address queue) (ash 1 30))))
-
-;;;; job control, independent listeners
-
-(defstruct session
- (lock (make-mutex :name "session lock"))
- (threads nil)
- (interactive-threads nil)
- (interactive-threads-queue (make-waitqueue)))
-
-(defvar *session* nil)
-
-;;; the debugger itself tries to acquire the session lock, don't let
-;;; funny situations (like getting a sigint while holding the session
-;;; lock) occur
-(defmacro with-session-lock ((session) &body body)
- `(sb!sys:without-interrupts
- (with-mutex ((session-lock ,session))
- ,@body)))
-
-(defun new-session ()
- (make-session :threads (list *current-thread*)
- :interactive-threads (list *current-thread*)))
-
-(defun init-job-control ()
- (setf *session* (new-session)))
-
-(defun %delete-thread-from-session (thread session)
- (with-session-lock (session)
- (setf (session-threads session)
- (delete thread (session-threads session))
- (session-interactive-threads session)
- (delete thread (session-interactive-threads session)))))
-
-(defun call-with-new-session (fn)
- (%delete-thread-from-session *current-thread* *session*)
- (let ((*session* (new-session)))
- (funcall fn)))
-
-(defmacro with-new-session (args &body forms)
- (declare (ignore args)) ;for extensibility
- (sb!int:with-unique-names (fb-name)
- `(labels ((,fb-name () ,@forms))
- (call-with-new-session (function ,fb-name)))))
-
-;;; Remove thread from its session, if it has one.
-(defun handle-thread-exit (thread)
- (with-mutex (*all-threads-lock*)
- (setq *all-threads* (delete thread *all-threads*)))
- (when *session*
- (%delete-thread-from-session thread *session*)))
-
-(defun terminate-session ()
- "Kill all threads in session except for this one. Does nothing if current
-thread is not the foreground thread"
- ;; FIXME: threads created in other threads may escape termination
- (let ((to-kill
- (with-session-lock (*session*)
- (and (eq *current-thread*
- (car (session-interactive-threads *session*)))
- (session-threads *session*)))))
- ;; do the kill after dropping the mutex; unwind forms in dying
- ;; threads may want to do session things
- (dolist (thread to-kill)
- (unless (eq thread *current-thread*)
- ;; terminate the thread but don't be surprised if it has
- ;; exited in the meantime
- (handler-case (terminate-thread thread)
- (interrupt-thread-error ()))))))
-
-;;; called from top of invoke-debugger
-(defun debugger-wait-until-foreground-thread (stream)
- "Returns T if thread had been running in background, NIL if it was
-interactive."
- (declare (ignore stream))
- (prog1
- (with-session-lock (*session*)
- (not (member *current-thread*
- (session-interactive-threads *session*))))
- (get-foreground)))
-
-(defun get-foreground ()
- (let ((was-foreground t))
- (loop
- (with-session-lock (*session*)
- (let ((int-t (session-interactive-threads *session*)))
- (when (eq (car int-t) *current-thread*)
- (unless was-foreground
- (format *query-io* "Resuming thread ~A~%" *current-thread*))
- (return-from get-foreground t))
- (setf was-foreground nil)
- (unless (member *current-thread* int-t)
- (setf (cdr (last int-t))
- (list *current-thread*)))
- (condition-wait
- (session-interactive-threads-queue *session*)
- (session-lock *session*)))))))
-
-(defun release-foreground (&optional next)
- "Background this thread. If NEXT is supplied, arrange for it to
-have the foreground next"
- (with-session-lock (*session*)
- (setf (session-interactive-threads *session*)
- (delete *current-thread* (session-interactive-threads *session*)))
- (when next
- (setf (session-interactive-threads *session*)
- (list* next
- (delete next (session-interactive-threads *session*)))))
- (condition-broadcast (session-interactive-threads-queue *session*))))
-
-(defun foreground-thread ()
- (car (session-interactive-threads *session*)))
-
-(defun make-listener-thread (tty-name)
- (assert (probe-file tty-name))
- (let* ((in (sb!unix:unix-open (namestring tty-name) sb!unix:o_rdwr #o666))
- (out (sb!unix:unix-dup in))
- (err (sb!unix:unix-dup in)))
- (labels ((thread-repl ()
- (sb!unix::unix-setsid)
- (let* ((sb!impl::*stdin*
- (sb!sys:make-fd-stream in :input t :buffering :line
- :dual-channel-p t))
- (sb!impl::*stdout*
- (sb!sys:make-fd-stream out :output t :buffering :line
- :dual-channel-p t))
- (sb!impl::*stderr*
- (sb!sys:make-fd-stream err :output t :buffering :line
- :dual-channel-p t))
- (sb!impl::*tty*
- (sb!sys:make-fd-stream err :input t :output t
- :buffering :line
- :dual-channel-p t))
- (sb!impl::*descriptor-handlers* nil))
- (with-new-session ()
- (unwind-protect
- (sb!impl::toplevel-repl nil)
- (sb!int:flush-standard-output-streams))))))
- (make-thread #'thread-repl))))
-
-;;;; the beef
-
-(defun make-thread (function &key name)
- (let* ((thread (%make-thread :name name))
- (setup-p nil)
- (real-function (coerce function 'function))
- (thread-sap
- (%create-thread
- (sb!kernel:get-lisp-obj-address
- (lambda ()
- ;; FIXME: use semaphores?
- (loop until setup-p)
- ;; in time we'll move some of the binding presently done in C
- ;; here too
- (let ((*current-thread* thread)
- (sb!kernel::*restart-clusters* nil)
- (sb!kernel::*handler-clusters* nil)
- (sb!kernel::*condition-restarts* nil)
- (sb!impl::*descriptor-handlers* nil) ; serve-event
- (sb!impl::*available-buffers* nil)) ;for fd-stream
- ;; can't use handling-end-of-the-world, because that flushes
- ;; output streams, and we don't necessarily have any (or we
- ;; could be sharing them)
- (unwind-protect
- (catch 'sb!impl::toplevel-catcher
- (catch 'sb!impl::%end-of-the-world
- (with-simple-restart
- (terminate-thread
- (format nil "~~@<Terminate this thread (~A)~~@:>"
- *current-thread*))
- ;; now that most things have a chance to work
- ;; properly without messing up other threads, it's
- ;; time to enable signals
- (sb!unix::reset-signal-mask)
- (unwind-protect
- (funcall real-function)
- ;; we're going down, can't handle
- ;; interrupts sanely anymore
- (sb!unix::block-blockable-signals)))))
- ;; mark the thread dead, so that the gc does not
- ;; wait for it to handle sig-stop-for-gc
- (%set-thread-state thread :dead)
- ;; and remove what can be the last reference to
- ;; the thread object
- (handle-thread-exit thread)
- 0))
- (values))))))
- (when (sb!sys:sap= thread-sap (sb!sys:int-sap 0))
- (error "Can't create a new thread"))
- (setf (thread-%sap thread) thread-sap)
- (with-mutex (*all-threads-lock*)
- (push thread *all-threads*))
- (with-session-lock (*session*)
- (push thread (session-threads *session*)))
- (setq setup-p t)
- (sb!impl::finalize thread (lambda () (reap-dead-thread thread-sap)))
- thread))
-
-(defun destroy-thread (thread)
- "Deprecated. Soon to be removed or reimplemented using pthread_cancel."
- (terminate-thread thread))
-
-;;; a moderate degree of care is expected for use of interrupt-thread,
-;;; due to its nature: if you interrupt a thread that was holding
-;;; important locks then do something that turns out to need those
-;;; locks, you probably won't like the effect.
-
-(define-condition interrupt-thread-error (error)
- ((thread :reader interrupt-thread-error-thread :initarg :thread)
- (errno :reader interrupt-thread-error-errno :initarg :errno))
- (:report (lambda (c s)
- (format s "interrupt thread ~A failed (~A: ~A)"
- (interrupt-thread-error-thread c)
- (interrupt-thread-error-errno c)
- (strerror (interrupt-thread-error-errno c))))))
-
-(defun interrupt-thread (thread function)
- "Interrupt THREAD and make it run FUNCTION."
- (let ((function (coerce function 'function)))
- (multiple-value-bind (res err)
- (sb!unix::syscall ("interrupt_thread"
- system-area-pointer sb!alien:unsigned-long)
- thread
- (thread-%sap thread)
- (sb!kernel:get-lisp-obj-address function))
- (unless res
- (error 'interrupt-thread-error :thread thread :errno err)))))
-
-(defun terminate-thread (thread)
- "Terminate the thread identified by THREAD, by causing it to run
-SB-EXT:QUIT - the usual cleanup forms will be evaluated"
- (interrupt-thread thread 'sb!ext:quit))
-
-;;; internal use only. If you think you need to use this, either you
-;;; are an SBCL developer, are doing something that you should discuss
-;;; with an SBCL developer first, or are doing something that you
-;;; should probably discuss with a professional psychiatrist first
-(defun symbol-value-in-thread (symbol thread)
- (let ((thread-sap (thread-%sap thread)))
- (let* ((index (sb!vm::symbol-tls-index symbol))
- (tl-val (sb!sys:sap-ref-word thread-sap
- (* sb!vm:n-word-bytes index))))
- (if (eql tl-val sb!vm::unbound-marker-widetag)
- (sb!vm::symbol-global-value symbol)
- (sb!kernel:make-lisp-obj tl-val)))))
-;;;; support for threads in the target machine common to uni- and
-;;;; multithread systems
+;;;; support for threads in the target machine
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
(in-package "SB!THREAD")
+;;; set the doc here because in early-thread FDOCUMENTATION is not
+;;; available, yet
+#!+sb-doc
+(setf (sb!kernel:fdocumentation '*current-thread* 'variable)
+ "Bound in each thread to the thread itself.")
+
(defstruct (thread (:constructor %make-thread))
+ #!+sb-doc
+ "Thread type. Do not rely on threads being structs as it may change
+in future versions."
name
%sap)
+#!+sb-doc
+(setf (sb!kernel:fdocumentation 'thread-name 'function)
+ "The name of the thread. Setfable.")
+
(def!method print-object ((thread thread) stream)
(if (thread-name thread)
(print-unreadable-object (thread stream :type t :identity t)
(:dead #.(sb!vm:fixnumize 3))))))
(defun thread-alive-p (thread)
+ #!+sb-doc
+ "Check if THREAD is running."
(not (eq :dead (thread-state thread))))
;; A thread is eligible for gc iff it has finished and there are no
(defvar *all-threads-lock* (make-mutex :name "all threads lock"))
(defun list-all-threads ()
+ #!+sb-doc
+ "Return a list of the live threads."
(with-mutex (*all-threads-lock*)
(copy-list *all-threads*)))
;; in case we are in reinit since saving core with multiple
;; threads doesn't work.
(setq *all-threads* (list initial-thread))))
+
+;;;;
+
+#!+sb-thread
+(progn
+ (define-alien-routine ("create_thread" %create-thread)
+ system-area-pointer
+ (lisp-fun-address unsigned-long))
+
+ (define-alien-routine reap-dead-thread void
+ (thread-sap system-area-pointer))
+
+ (declaim (inline futex-wait futex-wake))
+
+ (sb!alien:define-alien-routine "futex_wait"
+ int (word unsigned-long) (old-value unsigned-long))
+
+ (sb!alien:define-alien-routine "futex_wake"
+ int (word unsigned-long) (n unsigned-long)))
+
+;;; used by debug-int.lisp to access interrupt contexts
+#!-(and sb-fluid sb-thread) (declaim (inline sb!vm::current-thread-offset-sap))
+#!-sb-thread
+(defun sb!vm::current-thread-offset-sap (n)
+ (declare (type (unsigned-byte 27) n))
+ (sb!sys:sap-ref-sap (alien-sap (extern-alien "all_threads" (* t)))
+ (* n sb!vm:n-word-bytes)))
+
+;;;; spinlocks
+
+(defstruct spinlock
+ #!+sb-doc
+ "Spinlock type."
+ (name nil :type (or null simple-string))
+ (value 0))
+
+(declaim (inline get-spinlock release-spinlock))
+
+;;; The bare 2 here and below are offsets of the slots in the struct.
+;;; There ought to be some better way to get these numbers
+(defun get-spinlock (spinlock new-value)
+ (declare (optimize (speed 3) (safety 0))
+ #!-sb-thread
+ (ignore spinlock new-value))
+ ;; %instance-set-conditional can test for 0 (which is a fixnum) and
+ ;; store any value
+ #!+sb-thread
+ (loop until
+ (eql (sb!vm::%instance-set-conditional spinlock 2 0 new-value) 0)))
+
+(defun release-spinlock (spinlock)
+ (declare (optimize (speed 3) (safety 0))
+ #!-sb-thread (ignore spinlock))
+ ;; %instance-set-conditional cannot compare arbitrary objects
+ ;; meaningfully, so
+ ;; (sb!vm::%instance-set-conditional spinlock 2 our-value 0)
+ ;; does not work for bignum thread ids.
+ #!+sb-thread
+ (sb!vm::%instance-set spinlock 2 0))
+
+(defmacro with-spinlock ((spinlock) &body body)
+ (sb!int:with-unique-names (lock)
+ `(let ((,lock ,spinlock))
+ (get-spinlock ,lock *current-thread*)
+ (unwind-protect
+ (progn ,@body)
+ (release-spinlock ,lock)))))
+
+;;;; mutexes
+
+(defstruct mutex
+ #!+sb-doc
+ "Mutex type."
+ (name nil :type (or null simple-string))
+ (value nil))
+
+#!+sb-doc
+(setf (sb!kernel:fdocumentation 'make-mutex 'function)
+ "Create a mutex."
+ (sb!kernel:fdocumentation 'mutex-name 'function)
+ "The name of the mutex. Setfable."
+ (sb!kernel:fdocumentation 'mutex-value 'function)
+ "The value of the mutex. NIL if the mutex is free. Setfable.")
+
+#!+sb-thread
+(declaim (inline mutex-value-address))
+#!+sb-thread
+(defun mutex-value-address (mutex)
+ (declare (optimize (speed 3)))
+ (sb!ext:truly-the
+ sb!vm:word
+ (+ (sb!kernel:get-lisp-obj-address mutex)
+ (- (* 3 sb!vm:n-word-bytes) sb!vm:instance-pointer-lowtag))))
+
+(defun get-mutex (mutex &optional new-value (wait-p t))
+ #!+sb-doc
+ "Acquire MUTEX, setting it to NEW-VALUE or some suitable default
+value if NIL. If WAIT-P is non-NIL and the mutex is in use, sleep
+until it is available"
+ (declare (type mutex mutex) (optimize (speed 3)))
+ (unless new-value (setf new-value *current-thread*))
+ #!-sb-thread
+ (let ((old-value (mutex-value mutex)))
+ (when (and old-value wait-p)
+ (error "In unithread mode, mutex ~S was requested with WAIT-P ~S and ~
+ new-value ~S, but has already been acquired (with value ~S)."
+ mutex wait-p new-value old-value))
+ (setf (mutex-value mutex) new-value)
+ t)
+ #!+sb-thread
+ (let (old)
+ (when (eql new-value (mutex-value mutex))
+ (warn "recursive lock attempt ~S~%" mutex)
+ (format *debug-io* "Thread: ~A~%" *current-thread*)
+ (sb!debug:backtrace most-positive-fixnum *debug-io*)
+ (force-output *debug-io*))
+ (loop
+ (unless
+ (setf old (sb!vm::%instance-set-conditional mutex 2 nil new-value))
+ (return t))
+ (unless wait-p (return nil))
+ (futex-wait (mutex-value-address mutex)
+ (sb!kernel:get-lisp-obj-address old)))))
+
+(defun release-mutex (mutex)
+ #!+sb-doc
+ "Release MUTEX by setting it to NIL. Wake up threads waiting for
+this mutex."
+ (declare (type mutex mutex))
+ (setf (mutex-value mutex) nil)
+ #!+sb-thread
+ (futex-wake (mutex-value-address mutex) 1))
+
+;;;; waitqueues/condition variables
+
+(defstruct (waitqueue (:constructor %make-waitqueue))
+ #!+sb-doc
+ "Waitqueue type."
+ (name nil :type (or null simple-string))
+ (data nil))
+
+(defun make-waitqueue (&key name)
+ #!+sb-doc
+ "Create a waitqueue."
+ (%make-waitqueue :name name))
+
+#!+sb-doc
+(setf (sb!kernel:fdocumentation 'waitqueue-name 'function)
+ "The name of the waitqueue. Setfable.")
+
+#!+sb-thread
+(declaim (inline waitqueue-data-address))
+#!+sb-thread
+(defun waitqueue-data-address (waitqueue)
+ (declare (optimize (speed 3)))
+ (sb!ext:truly-the
+ sb!vm:word
+ (+ (sb!kernel:get-lisp-obj-address waitqueue)
+ (- (* 3 sb!vm:n-word-bytes) sb!vm:instance-pointer-lowtag))))
+
+(defun condition-wait (queue mutex)
+ #!+sb-doc
+ "Atomically release MUTEX and enqueue ourselves on QUEUE. Another
+thread may subsequently notify us using CONDITION-NOTIFY, at which
+time we reacquire MUTEX and return to the caller."
+ #!-sb-thread (declare (ignore queue))
+ (assert mutex)
+ #!-sb-thread (error "Not supported in unithread builds.")
+ #!+sb-thread
+ (let ((value (mutex-value mutex)))
+ (unwind-protect
+ (let ((me *current-thread*))
+ ;; XXX we should do something to ensure that the result of this setf
+ ;; is visible to all CPUs
+ (setf (waitqueue-data queue) me)
+ (release-mutex mutex)
+ ;; Now we go to sleep using futex-wait. If anyone else
+ ;; manages to grab MUTEX and call CONDITION-NOTIFY during
+ ;; this comment, it will change queue->data, and so
+ ;; futex-wait returns immediately instead of sleeping.
+ ;; Ergo, no lost wakeup
+ (futex-wait (waitqueue-data-address queue)
+ (sb!kernel:get-lisp-obj-address me)))
+ ;; If we are interrupted while waiting, we should do these things
+ ;; before returning. Ideally, in the case of an unhandled signal,
+ ;; we should do them before entering the debugger, but this is
+ ;; better than nothing.
+ (get-mutex mutex value))))
+
+(defun condition-notify (queue)
+ #!+sb-doc
+ "Notify one of the threads waiting on QUEUE."
+ #!-sb-thread (declare (ignore queue))
+ #!-sb-thread (error "Not supported in unithread builds.")
+ #!+sb-thread
+ (let ((me *current-thread*))
+ ;; no problem if >1 thread notifies during the comment in
+ ;; condition-wait: as long as the value in queue-data isn't the
+ ;; waiting thread's id, it matters not what it is
+ ;; XXX we should do something to ensure that the result of this setf
+ ;; is visible to all CPUs
+ (setf (waitqueue-data queue) me)
+ (futex-wake (waitqueue-data-address queue) 1)))
+
+(defun condition-broadcast (queue)
+ #!+sb-doc
+ "Notify all threads waiting on QUEUE."
+ #!-sb-thread (declare (ignore queue))
+ #!-sb-thread (error "Not supported in unithread builds.")
+ #!+sb-thread
+ (let ((me *current-thread*))
+ (setf (waitqueue-data queue) me)
+ (futex-wake (waitqueue-data-address queue) (ash 1 30))))
+
+;;;; job control, independent listeners
+
+(defstruct session
+ (lock (make-mutex :name "session lock"))
+ (threads nil)
+ (interactive-threads nil)
+ (interactive-threads-queue (make-waitqueue)))
+
+(defvar *session* nil)
+
+;;; the debugger itself tries to acquire the session lock, don't let
+;;; funny situations (like getting a sigint while holding the session
+;;; lock) occur
+(defmacro with-session-lock ((session) &body body)
+ #!-sb-thread (declare (ignore session))
+ #!-sb-thread
+ `(locally ,@body)
+ #!+sb-thread
+ `(sb!sys:without-interrupts
+ (with-mutex ((session-lock ,session))
+ ,@body)))
+
+(defun new-session ()
+ (make-session :threads (list *current-thread*)
+ :interactive-threads (list *current-thread*)))
+
+(defun init-job-control ()
+ (setf *session* (new-session)))
+
+(defun %delete-thread-from-session (thread session)
+ (with-session-lock (session)
+ (setf (session-threads session)
+ (delete thread (session-threads session))
+ (session-interactive-threads session)
+ (delete thread (session-interactive-threads session)))))
+
+(defun call-with-new-session (fn)
+ (%delete-thread-from-session *current-thread* *session*)
+ (let ((*session* (new-session)))
+ (funcall fn)))
+
+(defmacro with-new-session (args &body forms)
+ (declare (ignore args)) ;for extensibility
+ (sb!int:with-unique-names (fb-name)
+ `(labels ((,fb-name () ,@forms))
+ (call-with-new-session (function ,fb-name)))))
+
+;;; Remove thread from its session, if it has one.
+#!+sb-thread
+(defun handle-thread-exit (thread)
+ (with-mutex (*all-threads-lock*)
+ (setq *all-threads* (delete thread *all-threads*)))
+ (when *session*
+ (%delete-thread-from-session thread *session*)))
+
+(defun terminate-session ()
+ #!+sb-doc
+ "Kill all threads in session except for this one. Does nothing if current
+thread is not the foreground thread."
+ ;; FIXME: threads created in other threads may escape termination
+ (let ((to-kill
+ (with-session-lock (*session*)
+ (and (eq *current-thread*
+ (car (session-interactive-threads *session*)))
+ (session-threads *session*)))))
+ ;; do the kill after dropping the mutex; unwind forms in dying
+ ;; threads may want to do session things
+ (dolist (thread to-kill)
+ (unless (eq thread *current-thread*)
+ ;; terminate the thread but don't be surprised if it has
+ ;; exited in the meantime
+ (handler-case (terminate-thread thread)
+ (interrupt-thread-error ()))))))
+
+;;; called from top of invoke-debugger
+(defun debugger-wait-until-foreground-thread (stream)
+ "Returns T if thread had been running in background, NIL if it was
+interactive."
+ (declare (ignore stream))
+ #!-sb-thread nil
+ #!+sb-thread
+ (prog1
+ (with-session-lock (*session*)
+ (not (member *current-thread*
+ (session-interactive-threads *session*))))
+ (get-foreground)))
+
+(defun get-foreground ()
+ #!-sb-thread t
+ #!+sb-thread
+ (let ((was-foreground t))
+ (loop
+ (with-session-lock (*session*)
+ (let ((int-t (session-interactive-threads *session*)))
+ (when (eq (car int-t) *current-thread*)
+ (unless was-foreground
+ (format *query-io* "Resuming thread ~A~%" *current-thread*))
+ (return-from get-foreground t))
+ (setf was-foreground nil)
+ (unless (member *current-thread* int-t)
+ (setf (cdr (last int-t))
+ (list *current-thread*)))
+ (condition-wait
+ (session-interactive-threads-queue *session*)
+ (session-lock *session*)))))))
+
+(defun release-foreground (&optional next)
+ #!+sb-doc
+ "Background this thread. If NEXT is supplied, arrange for it to
+have the foreground next"
+ #!-sb-thread (declare (ignore next))
+ #!-sb-thread nil
+ #!+sb-thread
+ (with-session-lock (*session*)
+ (setf (session-interactive-threads *session*)
+ (delete *current-thread* (session-interactive-threads *session*)))
+ (when next
+ (setf (session-interactive-threads *session*)
+ (list* next
+ (delete next (session-interactive-threads *session*)))))
+ (condition-broadcast (session-interactive-threads-queue *session*))))
+
+(defun foreground-thread ()
+ (car (session-interactive-threads *session*)))
+
+(defun make-listener-thread (tty-name)
+ (assert (probe-file tty-name))
+ (let* ((in (sb!unix:unix-open (namestring tty-name) sb!unix:o_rdwr #o666))
+ (out (sb!unix:unix-dup in))
+ (err (sb!unix:unix-dup in)))
+ (labels ((thread-repl ()
+ (sb!unix::unix-setsid)
+ (let* ((sb!impl::*stdin*
+ (sb!sys:make-fd-stream in :input t :buffering :line
+ :dual-channel-p t))
+ (sb!impl::*stdout*
+ (sb!sys:make-fd-stream out :output t :buffering :line
+ :dual-channel-p t))
+ (sb!impl::*stderr*
+ (sb!sys:make-fd-stream err :output t :buffering :line
+ :dual-channel-p t))
+ (sb!impl::*tty*
+ (sb!sys:make-fd-stream err :input t :output t
+ :buffering :line
+ :dual-channel-p t))
+ (sb!impl::*descriptor-handlers* nil))
+ (with-new-session ()
+ (unwind-protect
+ (sb!impl::toplevel-repl nil)
+ (sb!int:flush-standard-output-streams))))))
+ (make-thread #'thread-repl))))
+
+;;;; the beef
+
+(defun make-thread (function &key name)
+ #!+sb-doc
+ "Create a new thread of NAME that runs FUNCTION. When the function
+returns the thread exits."
+ #!-sb-thread (declare (ignore function name))
+ #!-sb-thread (error "Not supported in unithread builds.")
+ #!+sb-thread
+ (let* ((thread (%make-thread :name name))
+ (setup-p nil)
+ (real-function (coerce function 'function))
+ (thread-sap
+ (%create-thread
+ (sb!kernel:get-lisp-obj-address
+ (lambda ()
+ ;; FIXME: use semaphores?
+ (loop until setup-p)
+ ;; in time we'll move some of the binding presently done in C
+ ;; here too
+ (let ((*current-thread* thread)
+ (sb!kernel::*restart-clusters* nil)
+ (sb!kernel::*handler-clusters* nil)
+ (sb!kernel::*condition-restarts* nil)
+ (sb!impl::*descriptor-handlers* nil) ; serve-event
+ (sb!impl::*available-buffers* nil)) ;for fd-stream
+ ;; can't use handling-end-of-the-world, because that flushes
+ ;; output streams, and we don't necessarily have any (or we
+ ;; could be sharing them)
+ (unwind-protect
+ (catch 'sb!impl::toplevel-catcher
+ (catch 'sb!impl::%end-of-the-world
+ (with-simple-restart
+ (terminate-thread
+ (format nil "~~@<Terminate this thread (~A)~~@:>"
+ *current-thread*))
+ ;; now that most things have a chance to work
+ ;; properly without messing up other threads, it's
+ ;; time to enable signals
+ (sb!unix::reset-signal-mask)
+ (unwind-protect
+ (funcall real-function)
+ ;; we're going down, can't handle
+ ;; interrupts sanely anymore
+ (sb!unix::block-blockable-signals)))))
+ ;; mark the thread dead, so that the gc does not
+ ;; wait for it to handle sig-stop-for-gc
+ (%set-thread-state thread :dead)
+ ;; and remove what can be the last reference to
+ ;; the thread object
+ (handle-thread-exit thread)
+ 0))
+ (values))))))
+ (when (sb!sys:sap= thread-sap (sb!sys:int-sap 0))
+ (error "Can't create a new thread"))
+ (setf (thread-%sap thread) thread-sap)
+ (with-mutex (*all-threads-lock*)
+ (push thread *all-threads*))
+ (with-session-lock (*session*)
+ (push thread (session-threads *session*)))
+ (setq setup-p t)
+ (sb!impl::finalize thread (lambda () (reap-dead-thread thread-sap)))
+ thread))
+
+(defun destroy-thread (thread)
+ #!+sb-doc
+ "Deprecated. Same as TERMINATE-THREAD."
+ (terminate-thread thread))
+
+(define-condition interrupt-thread-error (error)
+ ((thread :reader interrupt-thread-error-thread :initarg :thread)
+ (errno :reader interrupt-thread-error-errno :initarg :errno))
+ #!+sb-doc
+ (:documentation "Interrupting thread failed.")
+ (:report (lambda (c s)
+ (format s "interrupt thread ~A failed (~A: ~A)"
+ (interrupt-thread-error-thread c)
+ (interrupt-thread-error-errno c)
+ (strerror (interrupt-thread-error-errno c))))))
+
+#!+sb-doc
+(setf (sb!kernel:fdocumentation 'interrupt-thread-error-thread 'function)
+ "The thread that was not interrupted."
+ (sb!kernel:fdocumentation 'interrupt-thread-error-errno 'function)
+ "The reason why the interruption failed.")
+
+(defun interrupt-thread (thread function)
+ #!+sb-doc
+ "Interrupt the live THREAD and make it run FUNCTION. A moderate
+degree of care is expected for use of interrupt-thread, due to its
+nature: if you interrupt a thread that was holding important locks
+then do something that turns out to need those locks, you probably
+won't like the effect."
+ #!-sb-thread (declare (ignore thread))
+ ;; not quite perfect, because it does not take WITHOUT-INTERRUPTS
+ ;; into account
+ #!-sb-thread
+ (funcall function)
+ #!+sb-thread
+ (let ((function (coerce function 'function)))
+ (multiple-value-bind (res err)
+ (sb!unix::syscall ("interrupt_thread"
+ system-area-pointer sb!alien:unsigned-long)
+ thread
+ (thread-%sap thread)
+ (sb!kernel:get-lisp-obj-address function))
+ (unless res
+ (error 'interrupt-thread-error :thread thread :errno err)))))
+
+(defun terminate-thread (thread)
+ #!+sb-doc
+ "Terminate the thread identified by THREAD, by causing it to run
+SB-EXT:QUIT - the usual cleanup forms will be evaluated"
+ (interrupt-thread thread 'sb!ext:quit))
+
+;;; internal use only. If you think you need to use this, either you
+;;; are an SBCL developer, are doing something that you should discuss
+;;; with an SBCL developer first, or are doing something that you
+;;; should probably discuss with a professional psychiatrist first
+#!+sb-thread
+(defun symbol-value-in-thread (symbol thread)
+ (let ((thread-sap (thread-%sap thread)))
+ (let* ((index (sb!vm::symbol-tls-index symbol))
+ (tl-val (sb!sys:sap-ref-word thread-sap
+ (* sb!vm:n-word-bytes index))))
+ (if (eql tl-val sb!vm::unbound-marker-widetag)
+ (sb!vm::symbol-global-value symbol)
+ (sb!kernel:make-lisp-obj tl-val)))))
+++ /dev/null
-;;;; unithread stub support for threads in the target machine
-
-;;;; This software is part of the SBCL system. See the README file for
-;;;; more information.
-;;;;
-;;;; This software is derived from the CMU CL system, which was
-;;;; written at Carnegie Mellon University and released into the
-;;;; public domain. The software is in the public domain and is
-;;;; provided with absolutely no warranty. See the COPYING and CREDITS
-;;;; files for more information.
-
-(in-package "SB!THREAD")
-
-;;; used bu debug-int.lisp to access interrupt contexts
-#!-sb-fluid (declaim (inline sb!vm::current-thread-offset-sap))
-(defun sb!vm::current-thread-offset-sap (n)
- (declare (type (unsigned-byte 27) n))
- (sb!sys:sap-ref-sap (alien-sap (extern-alien "all_threads" (* t)))
- (* n sb!vm:n-word-bytes)))
-
-;;;; queues, locks
-
-;; spinlocks use 0 as "free" value: higher-level locks use NIL
-(defun get-spinlock (lock offset new-value)
- (declare (ignore lock offset new-value)))
-
-(defmacro with-spinlock ((queue) &body body)
- (declare (ignore queue))
- `(progn ,@body))
-
-;;;; the higher-level locking operations are based on waitqueues
-
-(defstruct waitqueue
- (name nil :type (or null simple-string))
- (lock 0)
- (data nil))
-
-(defstruct (mutex (:include waitqueue))
- (value nil))
-
-;;;; mutex
-
-(defun get-mutex (lock &optional new-value (wait-p t))
- (declare (type mutex lock))
- (let ((old-value (mutex-value lock)))
- (when (and old-value wait-p)
- (error "In unithread mode, mutex ~S was requested with WAIT-P ~S and ~
- new-value ~S, but has already been acquired (with value ~S)."
- lock wait-p new-value old-value))
- (setf (mutex-value lock) new-value)
- t))
-
-(defun release-mutex (lock)
- (declare (type mutex lock))
- (setf (mutex-value lock) nil))
-
-
-;; FIXME need suitable stub or ERROR-signaling definitions for
-;; condition-wait (queue lock)
-;; condition-notify (queue)
-
-;;;; job control
-
-(defun init-job-control () t)
-(defun debugger-wait-until-foreground-thread (stream)
- (declare (ignore stream))
- t)
-(defun get-foreground () t)
-(defun release-foreground (&optional next)
- (declare (ignore next))
- t)
-(defun terminate-session ())
#+sb-thread
(progn
- (defvar *pcl-lock* (sb-thread:make-waitqueue))
+ (defvar *pcl-lock* (sb-thread::make-spinlock))
(defmacro with-pcl-lock (&body body)
`(sb-thread::with-spinlock (*pcl-lock*)
else
return 0;
}
-#endif
-
-#if defined LISP_FEATURE_SB_THREAD
-/* This is not needed unless #+SB-THREAD, as there's a trivial null
- * unithread definition. */
/* called from lisp from the thread object finalizer */
void reap_dead_thread(struct thread *th)
;;;; absoluely no warranty. See the COPYING and CREDITS files for
;;;; more information.
-#-sb-thread (quit :unix-status 104)
-
(in-package "SB-THREAD") ; this is white-box testing, really
+(assert (eql 1 (length (list-all-threads))))
+
+(assert (eq *current-thread*
+ (find (thread-name *current-thread*) (list-all-threads)
+ :key #'thread-name :test #'equal)))
+
+(assert (thread-alive-p *current-thread*))
+
+(let ((a 0))
+ (interrupt-thread *current-thread* (lambda () (setq a 1)))
+ (assert (eql a 1)))
+
+(let ((spinlock (make-spinlock)))
+ (with-spinlock (spinlock)))
+
+(let ((mutex (make-mutex)))
+ (with-mutex (mutex)
+ mutex))
+
+#-sb-thread (sb-ext:quit :unix-status 104)
+
(let ((old-threads (list-all-threads))
(thread (make-thread (lambda ()
(assert (find *current-thread* *all-threads*))
(let ((l (make-mutex :name "foo"))
(p *current-thread*))
(assert (eql (mutex-value l) nil) nil "1")
- (assert (eql (mutex-lock l) 0) nil "2")
(sb-thread:get-mutex l)
(assert (eql (mutex-value l) p) nil "3")
- (assert (eql (mutex-lock l) 0) nil "4")
(sb-thread:release-mutex l)
- (assert (eql (mutex-value l) nil) nil "5")
- (assert (eql (mutex-lock l) 0) nil "6")
- (describe l))
+ (assert (eql (mutex-value l) nil) nil "5"))
(labels ((ours-p (value)
(sb-vm:control-stack-pointer-valid-p
(sb-sys:int-sap (sb-kernel:get-lisp-obj-address value)))))
(let ((l (make-mutex :name "rec")))
(assert (eql (mutex-value l) nil) nil "1")
- (assert (eql (mutex-lock l) 0) nil "2")
(sb-thread:with-recursive-lock (l)
(assert (ours-p (mutex-value l)) nil "3")
(sb-thread:with-recursive-lock (l)
(assert (ours-p (mutex-value l)) nil "4"))
(assert (ours-p (mutex-value l)) nil "5"))
- (assert (eql (mutex-value l) nil) nil "6")
- (assert (eql (mutex-lock l) 0) nil "7")))
+ (assert (eql (mutex-value l) nil) nil "6")))
-(let ((l (make-waitqueue :name "spinlock"))
+(let ((l (make-spinlock :name "spinlock"))
(p *current-thread*))
- (assert (eql (waitqueue-lock l) 0) nil "1")
+ (assert (eql (spinlock-value l) 0) nil "1")
(with-spinlock (l)
- (assert (eql (waitqueue-lock l) p) nil "2"))
- (assert (eql (waitqueue-lock l) 0) nil "3")
- (describe l))
+ (assert (eql (spinlock-value l) p) nil "2"))
+ (assert (eql (spinlock-value l) 0) nil "3"))
;; test that SLEEP actually sleeps for at least the given time, even
;; if interrupted by another thread exiting/a gc/anything
(let ((queue (make-waitqueue :name "queue"))
- (lock (make-mutex :name "lock")))
+ (lock (make-mutex :name "lock"))
+ (n 0))
(labels ((in-new-thread ()
(with-mutex (lock)
(assert (eql (mutex-value lock) *current-thread*))
;; now drop it and sleep
(condition-wait queue lock)
;; after waking we should have the lock again
- (assert (eql (mutex-value lock) *current-thread*)))))
+ (assert (eql (mutex-value lock) *current-thread*))
+ (assert (eql n 1))
+ (decf n))))
(make-thread #'in-new-thread)
(sleep 2) ; give it a chance to start
;; check the lock is free while it's asleep
(format t "parent thread ~A~%" *current-thread*)
(assert (eql (mutex-value lock) nil))
- (assert (eql (mutex-lock lock) 0))
(with-mutex (lock)
+ (incf n)
(condition-notify queue))
(sleep 1)))
;; check the lock is free while it's asleep
(format t "parent thread ~A~%" *current-thread*)
(assert (eql (mutex-value lock) nil))
- (assert (eql (mutex-lock lock) 0))
(with-recursive-lock (lock)
(condition-notify queue))
(sleep 1)))
(let (a-done b-done)
(make-thread (lambda ()
- (dotimes (i 100)
+ (dotimes (i 100)
(sb-ext:gc) (princ "\\") (force-output))
(setf a-done t)))
(make-thread (lambda ()
- (dotimes (i 25)
+ (dotimes (i 25)
(sb-ext:gc :full t)
(princ "/") (force-output))
(setf b-done t)))
;;; checkins which aren't released. (And occasionally for internal
;;; versions, especially for internal versions off the main CVS
;;; branch, it gets hairier, e.g. "0.pre7.14.flaky4.13".)
-"0.9.2.37"
+"0.9.2.38"
projects / sbcl.git / commitdiff