(in-package "SB!IMPL")
-(defmacro atomic-incf/symbol (symbol-name &optional (delta 1))
- #!-sb-thread
- `(incf ,symbol-name ,delta)
- #!+sb-thread
- `(locally
- (declare (optimize (safety 0) (speed 3)))
- (sb!vm::locked-symbol-global-value-add ',symbol-name ,delta)))
+;;;; these are initialized in cold init
-(defvar *gc-inhibit*) ; initialized in cold init
+(defvar *in-without-gcing*)
+(defvar *gc-inhibit*)
;;; When the dynamic usage increases beyond this amount, the system
;;; notes that a garbage collection needs to occur by setting
;;; *GC-PENDING* to T. It starts out as NIL meaning nobody has figured
;;; out what it should be yet.
-(defvar *gc-pending* nil)
+(defvar *gc-pending*)
#!+sb-thread
-(defvar *stop-for-gc-pending* nil)
+(defvar *stop-for-gc-pending*)
+
+;;; This one is initialized by the runtime, at thread creation. On
+;;; non-x86oid gencgc targets, this is a per-thread list of objects
+;;; which must not be moved during GC. It is frobbed by the code for
+;;; with-pinned-objects in src/compiler/target/macros.lisp.
+#!+(and gencgc (not (or x86 x86-64)))
+(defvar sb!vm::*pinned-objects*)
(defmacro without-gcing (&body body)
#!+sb-doc
locks, application code can never be certain that this invariant is
maintained."
(with-unique-names (without-gcing-body)
- `(flet ((,without-gcing-body ()
+ `(dx-flet ((,without-gcing-body ()
,@body))
(if *gc-inhibit*
(,without-gcing-body)
- (without-interrupts
- ;; We need to disable interrupts before disabling GC, so that
- ;; signal handlers using locks don't accidentally try to grab
- ;; them with GC inhibited.
- ;;
- ;; It would be nice to implement this with just a single UWP, but
- ;; unfortunately it seems that it cannot be done: the naive
- ;; solution of binding both *INTERRUPTS-ENABLED* and
- ;; *GC-INHIBIT*, and checking for both pending GC and interrupts
- ;; in the cleanup breaks if we have a GC pending, but no
- ;; interrupts, and we receive an asynch unwind while checking for
- ;; the pending GC: we unwind before handling the pending GC, and
- ;; will be left running with further GCs blocked due to the GC
- ;; pending flag.
+ ;; We need to disable interrupts before disabling GC, so
+ ;; that signal handlers using locks don't accidentally try
+ ;; to grab them with GC inhibited.
+ (let ((*in-without-gcing* t))
(unwind-protect
- (let ((*gc-inhibit* t))
+ (let* ((*allow-with-interrupts* nil)
+ (*interrupts-enabled* nil)
+ (*gc-inhibit* t))
(,without-gcing-body))
- (when (or *gc-pending* #!+sb-thread *stop-for-gc-pending*)
+ ;; This is not racy becuase maybe_defer_handler
+ ;; defers signals if *GC-INHIBIT* is NIL but there
+ ;; is a pending gc or stop-for-gc.
+ (when (or *interrupt-pending*
+ *gc-pending*
+ #!+sb-thread *stop-for-gc-pending*)
(sb!unix::receive-pending-interrupt))))))))
\f
;;; EOF-OR-LOSE is a useful macro that handles EOF.
;;; Just like PREPARE-FOR-FAST-READ-CHAR except that we get the BIN
;;; method. The stream is assumed to be a ANSI-STREAM.
;;;
-;;; KLUDGE: It seems weird to have to remember to explicitly call
-;;; DONE-WITH-FAST-READ-BYTE at the end of this, given that we're
-;;; already wrapping the stuff inside in a block. Why not rename this
-;;; macro to WITH-FAST-READ-BYTE, do the DONE-WITH-FAST-READ-BYTE stuff
-;;; automatically at the end of the block, and eliminate
-;;; DONE-WITH-FAST-READ-BYTE as a separate entity? (and similarly
-;;; for the FAST-READ-CHAR stuff) -- WHN 19990825
-(defmacro prepare-for-fast-read-byte (stream &body forms)
- `(let* ((%frc-stream% ,stream)
- (%frc-method% (ansi-stream-bin %frc-stream%))
- (%frc-buffer% (ansi-stream-in-buffer %frc-stream%))
- (%frc-index% (ansi-stream-in-index %frc-stream%)))
- (declare (type index %frc-index%)
- (type ansi-stream %frc-stream%))
- ,@forms))
-
-;;; Similar to fast-read-char, but we use a different refill routine & don't
-;;; convert to characters. If ANY-TYPE is true, then this can be used on any
-;;; integer streams, and we don't assert the result type.
-(defmacro fast-read-byte (&optional (eof-error-p t) (eof-value ()) any-type)
- ;; KLUDGE: should use ONCE-ONLY on EOF-ERROR-P and EOF-VALUE -- WHN 19990825
- `(truly-the
- ,(if (and (eq eof-error-p t) (not any-type)) '(unsigned-byte 8) t)
- (cond
- ((not %frc-buffer%)
- (funcall %frc-method% %frc-stream% ,eof-error-p ,eof-value))
- ((= %frc-index% +ansi-stream-in-buffer-length+)
- (prog1 (fast-read-byte-refill %frc-stream% ,eof-error-p ,eof-value)
- (setq %frc-index% (ansi-stream-in-index %frc-stream%))))
- (t
- (prog1 (aref %frc-buffer% %frc-index%)
- (incf %frc-index%))))))
-(defmacro done-with-fast-read-byte ()
- `(done-with-fast-read-char))
+;;; FIXME: Refactor PREPARE-FOR-FAST-READ-CHAR into similar shape.
+(defmacro with-fast-read-byte ((type stream &optional (eof-error-p t) eof-value)
+ &body body)
+ (aver (or (eq t eof-error-p) (eq t type)))
+ (with-unique-names (f-stream f-method f-buffer f-index eof-p eof-val)
+ `(let* ((,f-stream ,stream)
+ (,eof-p ,eof-error-p)
+ (,eof-val ,eof-value)
+ (,f-method (ansi-stream-bin ,f-stream))
+ (,f-buffer (ansi-stream-in-buffer ,f-stream))
+ (,f-index (ansi-stream-in-index ,f-stream)))
+ (declare (type ansi-stream ,f-stream)
+ (type index ,f-index))
+ (declare (disable-package-locks fast-read-byte))
+ (flet ((fast-read-byte ()
+ (,@(cond ((equal '(unsigned-byte 8) type)
+ ;; KLUDGE: For some reason I haven't tracked down
+ ;; this makes a difference even in given the TRULY-THE.
+ `(logand #xff))
+ (t
+ `(identity)))
+ (truly-the ,type
+ (cond
+ ((not ,f-buffer)
+ (funcall ,f-method ,f-stream ,eof-p ,eof-val))
+ ((= ,f-index +ansi-stream-in-buffer-length+)
+ (prog1 (fast-read-byte-refill ,f-stream ,eof-p ,eof-val)
+ (setq ,f-index (ansi-stream-in-index ,f-stream))))
+ (t
+ (prog1 (aref ,f-buffer ,f-index)
+ (incf ,f-index))))))))
+ (declare (inline fast-read-byte))
+ (declare (enable-package-locks read-byte))
+ (unwind-protect
+ (locally ,@body)
+ (setf (ansi-stream-in-index ,f-stream) ,f-index))))))
projects / sbcl.git / blobdiff