X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fgc.lisp;h=f3dacccbcd22e1dba6d3afb5b8a3438e2f19182b;hb=ebdf67c1da1884d5def43062a97174f28fcb6a2c;hp=35f646bb9bc2c7431acadbafc1691c522110bd0c;hpb=d45e8a2e9167150c8283783152d2449bd8d59d2d;p=sbcl.git diff --git a/src/code/gc.lisp b/src/code/gc.lisp index 35f646b..f3daccc 100644 --- a/src/code/gc.lisp +++ b/src/code/gc.lisp @@ -23,37 +23,43 @@ (defun ,lisp-fun () (sb!alien:extern-alien ,c-var-name (sb!alien:unsigned 32)))))) -#!+(or cgc gencgc) (progn -#!-sb-fluid (declaim (inline dynamic-usage)) -(def-c-var-frob dynamic-usage "bytes_allocated")) - -#!-(or cgc gencgc) +#!-gencgc +(progn + ;; This is called once per PROFILEd function call, so it's worth a + ;; little possible space cost to reduce its time cost. + #!-sb-fluid + (declaim (inline current-dynamic-space-start)) + (def-c-var-frob current-dynamic-space-start "current_dynamic_space")) + +#!-sb-fluid +(declaim (inline dynamic-usage)) ; to reduce PROFILEd call overhead +#!+gencgc +(def-c-var-frob dynamic-usage "bytes_allocated") +#!-gencgc (defun dynamic-usage () (the (unsigned-byte 32) (- (sb!sys:sap-int (sb!c::dynamic-space-free-pointer)) (current-dynamic-space-start)))) -#!-gencgc (progn -#!-sb-fluid (declaim (inline current-dynamic-space-start)) -(def-c-var-frob current-dynamic-space-start "current_dynamic_space")) - (defun static-space-usage () - (- (* sb!vm:*static-space-free-pointer* sb!vm:word-bytes) + (- (* sb!vm:*static-space-free-pointer* sb!vm:n-word-bytes) sb!vm:static-space-start)) (defun read-only-space-usage () - (- (* sb!vm::*read-only-space-free-pointer* sb!vm:word-bytes) + (- (* sb!vm::*read-only-space-free-pointer* sb!vm:n-word-bytes) sb!vm:read-only-space-start)) (defun control-stack-usage () - #!-x86 (- (sb!sys:sap-int (sb!c::control-stack-pointer-sap)) - sb!vm:control-stack-start) - #!+x86 (- sb!vm:control-stack-end - (sb!sys:sap-int (sb!c::control-stack-pointer-sap)))) + #!-stack-grows-downward-not-upward + (- (sb!sys:sap-int (sb!c::control-stack-pointer-sap)) + (sb!vm:fixnumize sb!vm:*control-stack-start*)) + #!+stack-grows-downward-not-upward + (- (sb!vm:fixnumize sb!vm:*control-stack-end*) + (sb!sys:sap-int (sb!c::control-stack-pointer-sap)))) (defun binding-stack-usage () (- (sb!sys:sap-int (sb!c::binding-stack-pointer-sap)) - sb!vm:binding-stack-start)) + (sb!vm:fixnumize sb!vm:*binding-stack-start*))) ;;;; ROOM @@ -63,14 +69,17 @@ (format t "Static space usage is: ~10:D bytes.~%" (static-space-usage)) (format t "Control stack usage is: ~10:D bytes.~%" (control-stack-usage)) (format t "Binding stack usage is: ~10:D bytes.~%" (binding-stack-usage)) + #!+sb-thread + (format t + "Control and binding stack usage is for the current thread only.~%") (format t "Garbage collection is currently ~:[enabled~;DISABLED~].~%" - *gc-inhibit*)) + (> *gc-inhibit* 0))) (defun room-intermediate-info () (room-minimal-info) (sb!vm:memory-usage :count-spaces '(:dynamic) :print-spaces t - :cutoff 0.05s0 + :cutoff 0.05f0 :print-summary nil)) (defun room-maximal-info () @@ -81,13 +90,12 @@ (defun room (&optional (verbosity :default)) #!+sb-doc - "Prints to *STANDARD-OUTPUT* information about the state of internal + "Print to *STANDARD-OUTPUT* information about the state of internal storage and its management. The optional argument controls the - verbosity of ROOM. If it is T, ROOM prints out a maximal amount of + verbosity of output. If it is T, ROOM prints out a maximal amount of information. If it is NIL, ROOM prints out a minimal amount of information. If it is :DEFAULT or it is not supplied, ROOM prints out - an intermediate amount of information. See also VM:MEMORY-USAGE and - VM:INSTANCE-USAGE for finer report control." + an intermediate amount of information." (fresh-line) (ecase verbosity ((t) @@ -100,69 +108,48 @@ ;;;; GET-BYTES-CONSED -;;; internal state -(defvar *last-bytes-in-use* nil) -(defvar *total-bytes-consed* 0) -(declaim (type (or index null) *last-bytes-in-use*)) -(declaim (type unsigned-byte *total-bytes-consed*)) +;;; the total number of bytes freed so far (including any freeing +;;; which goes on in PURIFY) +;;; +;;; (We save this so that we can calculate the total number of bytes +;;; ever allocated by adding this to the number of bytes currently +;;; allocated and never freed.) +(declaim (type unsigned-byte *n-bytes-freed-or-purified*)) +(defvar *n-bytes-freed-or-purified* 0) +(push (lambda () + (setf *n-bytes-freed-or-purified* 0)) + ;; KLUDGE: It's probably not quite safely right either to do + ;; this in *BEFORE-SAVE-INITIALIZATIONS* (since consing, or even + ;; worse, something which depended on (GET-BYTES-CONSED), might + ;; happen after that) or in *AFTER-SAVE-INITIALIZATIONS*. But + ;; it's probably not a big problem, and there seems to be no + ;; other obvious time to do it. -- WHN 2001-07-30 + *after-save-initializations*) (declaim (ftype (function () unsigned-byte) get-bytes-consed)) (defun get-bytes-consed () #!+sb-doc - "Return the number of bytes consed since the first time this function - was called. The first time it is called, it returns zero." - (declare (optimize (speed 3) (safety 0))) - (cond ((null *last-bytes-in-use*) - (setq *last-bytes-in-use* (dynamic-usage)) - (setq *total-bytes-consed* 0)) - (t - (let ((bytes (dynamic-usage))) - (incf *total-bytes-consed* - (the index (- bytes *last-bytes-in-use*))) - (setq *last-bytes-in-use* bytes)))) - ;; FIXME: We should really use something like PCOUNTER to make this - ;; hold reliably. - (aver (not (minusp *total-bytes-consed*))) - *total-bytes-consed*) + "Return the number of bytes consed since the program began. Typically +this result will be a consed bignum, so if you have an application (e.g. +profiling) which can't tolerate the overhead of consing bignums, you'll +probably want either to hack in at a lower level (as the code in the +SB-PROFILE package does), or to design a more microefficient interface +and submit it as a patch." + (+ (dynamic-usage) + *n-bytes-freed-or-purified*)) -;;;; variables and constants - -;;; the default value of *BYTES-CONSED-BETWEEN-GCS* and *GC-TRIGGER* -(defconstant default-bytes-consed-between-gcs 2000000) - -;;; the minimum amount of dynamic space which must be consed before a -;;; GC will be triggered -;;; -;;; Unlike CMU CL, we don't export this variable. (There's no need to, -;;; since the BYTES-CONSED-BETWEEN-GCS function is SETFable.) -(defvar *bytes-consed-between-gcs* default-bytes-consed-between-gcs) -(declaim (type index *bytes-consed-between-gcs*)) - ;;;; GC hooks -;;; These variables are a list of functions which are run before and -;;; after garbage collection occurs. (defvar *before-gc-hooks* nil ; actually initialized in cold init #!+sb-doc "A list of functions that are called before garbage collection occurs. The functions should take no arguments.") + (defvar *after-gc-hooks* nil ; actually initialized in cold init #!+sb-doc "A list of functions that are called after garbage collection occurs. The functions should take no arguments.") -;;; This hook is invoked whenever SUB-GC intends to GC (unless the GC -;;; was explicitly forced by calling SB!EXT:GC). If the hook function -;;; returns NIL then the GC procedes; otherwise, the GC is inhibited and -;;; *GC-INHIBIT* and *NEED-TO-COLLECT-GARBAGE* are left bound to T. -;;; Presumably someone will call GC-ON later to collect the garbage. -(defvar *gc-inhibit-hook* nil - #!+sb-doc - "Should be bound to a function or NIL. If it is a function, this - function should take one argument, the current amount of dynamic - usage. The function should return NIL if garbage collection should - continue and non-NIL if it should be inhibited. Use with caution.") - (defvar *gc-notify-stream* nil ; (actually initialized in cold init) #!+sb-doc "When non-NIL, this must be a STREAM; and the functions bound to @@ -172,98 +159,58 @@ (defvar *gc-run-time* 0 #!+sb-doc - "The total CPU time spent doing garbage collection (as reported by - GET-INTERNAL-RUN-TIME.)") + "the total CPU time spent doing garbage collection (as reported by + GET-INTERNAL-RUN-TIME)") (declaim (type index *gc-run-time*)) -;;; a limit to help catch programs which allocate too much memory, -;;; since a hard heap overflow is so hard to recover from. -(declaim (type (or unsigned-byte null) *soft-heap-limit*)) -(defvar *soft-heap-limit* nil) +;;;; The following specials are used to control when garbage +;;;; collection occurs. -;;; Internal trigger. When the dynamic usage increases beyond this -;;; amount, the system notes that a garbage collection needs to occur by -;;; setting *NEED-TO-COLLECT-GARBAGE* to T. It starts out as NIL meaning +;;; When the dynamic usage increases beyond this amount, the system +;;; notes that a garbage collection needs to occur by setting +;;; *NEED-TO-COLLECT-GARBAGE* to T. It starts out as NIL meaning ;;; nobody has figured out what it should be yet. -(defvar *gc-trigger* nil) - +;;; +;;; FIXME: *GC-TRIGGER* seems to be denominated in bytes, not words. +;;; And limiting it to INDEX is fairly reasonable in order to avoid +;;; bignum arithmetic on every allocation, and to minimize the need +;;; for thought about weird gotchas of the GC-control mechanism itself +;;; consing as it operates. But as of sbcl-0.7.5, 512Mbytes of memory +;;; costs $54.95 at Fry's in Dallas but cheap consumer 64-bit machines +;;; are still over the horizon, so gratuitously limiting our heap size +;;; to FIXNUM bytes seems fairly stupid. It'd be reasonable to +;;; (1) allow arbitrary UNSIGNED-BYTE values of *GC-TRIGGER*, or +;;; (2) redenominate this variable in words instead of bytes, postponing +;;; the problem to heaps which exceed 50% of the machine's address +;;; space, or even +;;; (3) redemoninate this variable in CONS-sized two-word units, +;;; allowing it to cover the entire memory space at the price of +;;; possible loss of clarity. +;;; (And whatever is done, it'd also be good to rename the variable so +;;; that it's clear what unit it's denominated in.) (declaim (type (or index null) *gc-trigger*)) +(defvar *gc-trigger* nil) -;;; On the RT, we store the GC trigger in a ``static'' symbol instead of -;;; letting magic C code handle it. It gets initialized by the startup -;;; code. The X86 port defines this here because it uses the `ibmrt' -;;; feature in the C code for allocation and binding stack access and -;;; a lot of stuff wants this INTERNAL_GC_TRIGGER available as well. -#!+(or ibmrt x86) -(defvar sb!vm::*internal-gc-trigger*) - -;;;; The following specials are used to control when garbage collection -;;;; occurs. - -;;; When non-NIL, inhibits garbage collection. +;;; When >0, inhibits garbage collection. (defvar *gc-inhibit*) ; initialized in cold init -;;; This flag is used to prevent recursive entry into the garbage -;;; collector. -(defvar *already-maybe-gcing*) ; initialized in cold init - -;;; When T, indicates that the dynamic usage has exceeded the value -;;; *GC-TRIGGER*. +;;; When T, indicates that a GC should have happened but did not due to +;;; *GC-INHIBIT*. (defvar *need-to-collect-garbage* nil) ; initialized in cold init -(defun default-gc-notify-before (notify-stream bytes-in-use) - (declare (type stream notify-stream)) - (format notify-stream - "~&; GC is beginning with ~:D bytes in use.~%" - bytes-in-use) - (finish-output notify-stream)) -(defparameter *gc-notify-before* #'default-gc-notify-before - #!+sb-doc - "This function bound to this variable is invoked before GC'ing (unless - *GC-NOTIFY-STREAM* is NIL) with the value of *GC-NOTIFY-STREAM* and - current amount of dynamic usage (in bytes). It should notify the - user that the system is going to GC.") - -(defun default-gc-notify-after (notify-stream - bytes-retained - bytes-freed - new-trigger) - (declare (type stream notify-stream)) - (format notify-stream - "~&; GC has finished with ~:D bytes in use (~:D bytes freed).~%" - bytes-retained - bytes-freed) - (format notify-stream - "~&; The new GC trigger is ~:D bytes.~%" - new-trigger) - (finish-output notify-stream)) -(defparameter *gc-notify-after* #'default-gc-notify-after - #!+sb-doc - "The function bound to this variable is invoked after GC'ing with -the value of *GC-NOTIFY-STREAM*, the amount of dynamic usage (in -bytes) now free, the number of bytes freed by the GC, and the new GC -trigger threshold. The function should notify the user that the system -has finished GC'ing.") - ;;;; internal GC -(sb!alien:def-alien-routine collect-garbage sb!c-call:int - #!+gencgc (last-gen sb!c-call:int)) +(sb!alien:define-alien-routine collect-garbage sb!alien:int + (#!+gencgc last-gen #!-gencgc ignore sb!alien:int)) +#!+sb-thread +(def-c-var-frob gc-thread-pid "gc_thread_pid") -(sb!alien:def-alien-routine set-auto-gc-trigger sb!c-call:void - (dynamic-usage sb!c-call:unsigned-long)) - -(sb!alien:def-alien-routine clear-auto-gc-trigger sb!c-call:void) - -;;; This variable contains the function that does the real GC. This is -;;; for low-level GC experimentation. Do not touch it if you do not -;;; know what you are doing. -(defvar *internal-gc* #'collect-garbage) + ;;;; SUB-GC -;;; Used to carefully invoke hooks. +;;; This is used to carefully invoke hooks. (eval-when (:compile-toplevel :execute) (sb!xc:defmacro carefully-funcall (function &rest args) `(handler-case (funcall ,function ,@args) @@ -271,144 +218,64 @@ has finished GC'ing.") (warn "(FUNCALL ~S~{ ~S~}) lost:~%~A" ',function ',args cond) nil)))) -;;; SUB-GC decides when and if to do a garbage collection. -;;; The FORCE-P flags controls if a GC should occur even if -;;; the dynamic usage is not greater than *GC-TRIGGER*. +;;; SUB-GC does a garbage collection. This is called from three places: +;;; (1) The C runtime will call here when it detects that we've consed +;;; enough to exceed the gc trigger threshold +;;; (2) The user may request a collection using GC, below +;;; (3) At the end of a WITHOUT-GCING section, we are called if +;;; *NEED-TO-COLLECT-GARBAGE* is true ;;; +;;; This is different from the behaviour in 0.7 and earlier: it no +;;; longer decides whether to GC based on thresholds. If you call +;;; SUB-GC you will definitely get a GC either now or when the +;;; WITHOUT-GCING is over + ;;; For GENCGC all generations < GEN will be GC'ed. -(defun sub-gc (&key force-p (gen 0)) - (/show0 "entering SUB-GC") - (unless *already-maybe-gcing* - (let* ((*already-maybe-gcing* t) - (start-time (get-internal-run-time)) - (pre-gc-dyn-usage (dynamic-usage)) - ;; Currently we only check *SOFT-HEAP-LIMIT* at GC time, - ;; not for every allocation. That makes it cheap to do, - ;; even if it is a little ugly. - (soft-heap-limit-exceeded? (and *soft-heap-limit* - (> pre-gc-dyn-usage - *soft-heap-limit*))) - (*soft-heap-limit* (if soft-heap-limit-exceeded? - (+ pre-gc-dyn-usage - *bytes-consed-between-gcs*) - *soft-heap-limit*))) - (when soft-heap-limit-exceeded? - (cerror "Continue with GC." - "soft heap limit exceeded (temporary new limit=~D)" - *soft-heap-limit*)) - (unless (integerp (symbol-value '*bytes-consed-between-gcs*)) - ;; The noise w/ symbol-value above is to keep the compiler - ;; from optimizing the test away because of the type declaim - ;; for *bytes-consed-between-gcs*. - ;; - ;; FIXME: I'm inclined either to get rid of the DECLAIM or to - ;; trust it, instead of doing this weird hack. It's not - ;; particularly trustable, since (SETF - ;; *BYTES-CONSED-BETWEEN-GCS* 'SEVEN) works. But it's also not - ;; very nice to have the type of the variable specified in two - ;; places which can (and in CMU CL 2.4.8 did, INTEGER vs. - ;; INDEX) drift apart. So perhaps we should just add a note to - ;; the variable documentation for *BYTES-CONSED-BETWEEN-GCS* - ;; that it must be an INDEX, and remove the DECLAIM. Or we - ;; could make a SETFable (BYTES-CONSED-BETWEEN-GCS) function - ;; and enforce the typing that way. And in fact the SETFable - ;; function already exists, so all we need do is make the - ;; variable private, and then we can trust the DECLAIM. - (warn "The value of *BYTES-CONSED-BETWEEN-GCS*, ~S, is not an ~ - integer. Resetting it to ~D." - *bytes-consed-between-gcs* - default-bytes-consed-between-gcs) - (setf *bytes-consed-between-gcs* default-bytes-consed-between-gcs)) - (when (and *gc-trigger* (> pre-gc-dyn-usage *gc-trigger*)) - (setf *need-to-collect-garbage* t)) - (when (or force-p - (and *need-to-collect-garbage* (not *gc-inhibit*))) - (when (and (not force-p) - *gc-inhibit-hook* - (carefully-funcall *gc-inhibit-hook* pre-gc-dyn-usage)) - (setf *gc-inhibit* t) - (return-from sub-gc nil)) - ;; KLUDGE: Wow, we really mask interrupts all the time we're - ;; collecting garbage? That seems like a long time.. -- WHN 19991129 - (without-interrupts - ;; FIXME: We probably shouldn't do this evil thing to - ;; *STANDARD-OUTPUT* in a binding which is wrapped around - ;; calls to user-settable GC hook functions. - (let ((*standard-output* *terminal-io*)) - (when *gc-notify-stream* - (if (streamp *gc-notify-stream*) - (carefully-funcall *gc-notify-before* - *gc-notify-stream* - pre-gc-dyn-usage) - (warn - "*GC-NOTIFY-STREAM* is set, but not a STREAM -- ignored."))) - (dolist (hook *before-gc-hooks*) - (carefully-funcall hook)) - (when *gc-trigger* - (clear-auto-gc-trigger)) - #!-gencgc (funcall *internal-gc*) - ;; FIXME: This EQ test is pretty gross. Among its other - ;; nastinesses, it looks as though it could break if we - ;; recompile COLLECT-GARBAGE. - #!+gencgc (if (eq *internal-gc* #'collect-garbage) - (funcall *internal-gc* gen) - (funcall *internal-gc*)) - (let* ((post-gc-dyn-usage (dynamic-usage)) - (bytes-freed (- pre-gc-dyn-usage post-gc-dyn-usage))) - (/show0 "got (DYNAMIC-USAGE) and BYTES-FREED") - (when *last-bytes-in-use* - (/show0 "doing *LAST-BYTES-IN-USE* thing") - (incf *total-bytes-consed* - (- pre-gc-dyn-usage *last-bytes-in-use*)) - (/show0 "setting *LAST-BYTES-IN-USE*") - (setq *last-bytes-in-use* post-gc-dyn-usage)) - (/show0 "clearing *NEED-TO-COLLECT-GARBAGE*") - (setf *need-to-collect-garbage* nil) - (/show0 "calculating NEW-GC-TRIGGER") - (let ((new-gc-trigger (+ post-gc-dyn-usage - *bytes-consed-between-gcs*))) - (/show0 "setting *GC-TRIGGER*") - (setf *gc-trigger* new-gc-trigger)) - (/show0 "calling SET-AUTO-GC-TRIGGER") - (set-auto-gc-trigger *gc-trigger*) - (dolist (hook *after-gc-hooks*) - (/show0 "doing a hook from *AFTER-GC--HOOKS*") - ;; FIXME: This hook should be called with the same - ;; kind of information as *GC-NOTIFY-AFTER*. In - ;; particular, it would be nice for the hook function - ;; to be able to adjust *GC-TRIGGER* intelligently to - ;; e.g. 108% of total memory usage. - (carefully-funcall hook)) - (when *gc-notify-stream* - (if (streamp *gc-notify-stream*) - (carefully-funcall *gc-notify-after* - *gc-notify-stream* - post-gc-dyn-usage - bytes-freed - *gc-trigger*) - (warn - "*GC-NOTIFY-STREAM* is set, but not a stream -- ignored."))))) - (scrub-control-stack))) ;XXX again? we did this from C ... - (incf *gc-run-time* (- (get-internal-run-time) - start-time)))) - ;; FIXME: should probably return (VALUES), here and in RETURN-FROM - nil) -;;; This routine is called by the allocation miscops to decide whether -;;; a GC should occur. The argument, OBJECT, is the newly allocated -;;; object which must be returned to the caller. -(defun maybe-gc (&optional object) - (sub-gc) - object) +#!+sb-thread +(defun sub-gc (&key (gen 0) &aux (pre-gc-dynamic-usage (dynamic-usage))) + (setf *need-to-collect-garbage* t) + (when (zerop *gc-inhibit*) + (setf (sb!alien:extern-alien "maybe_gc_pending" (sb!alien:unsigned 32)) + (1+ gen)) + (if (zerop (sb!alien:extern-alien "stop_the_world" (sb!alien:unsigned 32))) + (sb!unix:unix-kill (gc-thread-pid) :SIGALRM)) + (loop + (when (zerop + (sb!alien:extern-alien "maybe_gc_pending" (sb!alien:unsigned 32))) + (return nil))) + (incf *n-bytes-freed-or-purified* + (max 0 (- pre-gc-dynamic-usage (dynamic-usage)))) + (setf *need-to-collect-garbage* nil) + (scrub-control-stack)) + (values)) + +#!-sb-thread +(defvar *already-in-gc* nil "System is running SUB-GC") +#!-sb-thread +(defun sub-gc (&key (gen 0) &aux (pre-gc-dynamic-usage (dynamic-usage))) + (when *already-in-gc* (return-from sub-gc nil)) + (setf *need-to-collect-garbage* t) + (when (zerop *gc-inhibit*) + (let ((*already-in-gc* t)) + (without-interrupts (collect-garbage gen)) + (incf *n-bytes-freed-or-purified* + (max 0 (- pre-gc-dynamic-usage (dynamic-usage)))) + (setf *need-to-collect-garbage* nil)) + (scrub-control-stack)) + (values)) + -;;; This is the user-advertised garbage collection function. +;;; This is the user-advertised garbage collection function. (defun gc (&key (gen 0) (full nil) &allow-other-keys) #!+(and sb-doc gencgc) - "Initiates a garbage collection. GEN controls the number of generations to garbage collect" + "Initiate a garbage collection. GEN controls the number of generations + to garbage collect." #!+(and sb-doc (not gencgc)) - "Initiates a garbage collection. GEN may be provided for compatibility, but is ignored" - (sub-gc :force-p t :gen (if full 6 gen))) + "Initiate a garbage collection. GEN may be provided for compatibility with + generational garbage collectors, but is ignored in this implementation." + (sub-gc :gen (if full 6 gen))) ;;;; auxiliary functions @@ -417,42 +284,26 @@ has finished GC'ing.") #!+sb-doc "Return the amount of memory that will be allocated before the next garbage collection is initiated. This can be set with SETF." - *bytes-consed-between-gcs*) + (sb!alien:extern-alien "bytes_consed_between_gcs" + (sb!alien:unsigned 32))) + (defun (setf bytes-consed-between-gcs) (val) - ;; FIXME: Shouldn't this (and the DECLAIM for the underlying variable) - ;; be for a strictly positive number type, e.g. - ;; (AND (INTEGER 1) FIXNUM)? (declare (type index val)) - (let ((old *bytes-consed-between-gcs*)) - (setf *bytes-consed-between-gcs* val) - (when *gc-trigger* - (setf *gc-trigger* (+ *gc-trigger* (- val old))) - (cond ((<= (dynamic-usage) *gc-trigger*) - (clear-auto-gc-trigger) - (set-auto-gc-trigger *gc-trigger*)) - (t - (sb!sys:scrub-control-stack) - (sub-gc))))) - val) + (setf (sb!alien:extern-alien "bytes_consed_between_gcs" + (sb!alien:unsigned 32)) + val)) (defun gc-on () #!+sb-doc - "Enables the garbage collector." - (setq *gc-inhibit* nil) + "Enable the garbage collector." + (setq *gc-inhibit* 0) (when *need-to-collect-garbage* (sub-gc)) nil) (defun gc-off () #!+sb-doc - "Disables the garbage collector." - (setq *gc-inhibit* t) + "Disable the garbage collector." + (setq *gc-inhibit* 1) nil) - -;;;; initialization stuff -(defun gc-cold-init-or-reinit () - (when *gc-trigger* - (if (< *gc-trigger* (dynamic-usage)) - (sub-gc) - (set-auto-gc-trigger *gc-trigger*))))