+;;;; support for threads needed at cross-compile time
+
+;;;; 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")
-(defvar *session-lock*)
+(sb!xc:defmacro with-mutex ((mutex &key value (wait-p t)) &body body)
+ #!-sb-thread (declare (ignore mutex value wait-p))
+ #!+sb-thread
+ (with-unique-names (got)
+ `(let ((,got (get-mutex ,mutex ,value ,wait-p)))
+ (when ,got
+ (unwind-protect
+ (locally ,@body)
+ (release-mutex ,mutex)))))
+ ;; KLUDGE: this separate expansion for (NOT SB-THREAD) is not
+ ;; strictly necessary; GET-MUTEX and RELEASE-MUTEX are implemented.
+ ;; However, there would be a (possibly slight) performance hit in
+ ;; using them.
+ #!-sb-thread
+ `(locally ,@body))
(sb!xc:defmacro with-recursive-lock ((mutex) &body body)
+ #!-sb-thread (declare (ignore mutex))
#!+sb-thread
(with-unique-names (cfp)
`(let ((,cfp (sb!kernel:current-fp)))
;; confuse GC completely. -- CSR, 2003-06-03
(get-mutex ,mutex (sb!kernel:make-lisp-obj (sb!sys:sap-int ,cfp))))
(unwind-protect
- (progn ,@body)
+ (locally ,@body)
(when (sb!sys:sap= (sb!sys:int-sap
(sb!kernel:get-lisp-obj-address
(mutex-value ,mutex)))
,cfp)
(release-mutex ,mutex)))))
#!-sb-thread
- `(progn ,@body))
-
-#!+sb-thread
-(defun get-foreground ()
- (when (not (eql (mutex-value *session-lock*) (current-thread-id)))
- (get-mutex *session-lock*))
- (sb!sys:enable-interrupt :sigint #'sb!unix::sigint-handler)
- t)
-#!-sb-thread
-(defun get-foreground () t)
+ `(locally ,@body))
-#!+sb-thread
-(defun release-foreground ()
- (sb!sys:enable-interrupt :sigint :ignore)
- (release-mutex *session-lock*)
- t)
-#!-sb-thread
-(defun release-foreground () t)