0.8.16.16:

[sbcl.git] / src / code / target-unithread.lisp

diff --git a/src/code/target-unithread.lisp b/src/code/target-unithread.lisp
index 6eb1df2..886ed82 100644 (file)
--- a/src/code/target-unithread.lisp
+++ b/src/code/target-unithread.lisp
@@ -1,3 +1,14 @@
+;;;; 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
@@ -11,6 +22,8 @@
   (sb!sys:sap-ref-32 (alien-sap (extern-alien "all_threads" (* t))) 
               (* sb!vm::thread-pid-slot 4)))
 
+(defun reap-dead-threads ())
+
 ;;;; queues, locks 
 
 ;; spinlocks use 0 as "free" value: higher-level locks use NIL
@@ -24,7 +37,7 @@
 ;;;; the higher-level locking operations are based on waitqueues
 
 (defstruct waitqueue
-  (name nil :type (or null simple-base-string))
+  (name nil :type (or null simple-string))
   (lock 0)
   (data nil))
 
@@ -92,16 +105,19 @@
        (return t))
      (setf old-value t1))))
 
-(defmacro with-mutex ((mutex &key value (wait-p t))  &body body)
-  (cond ((not wait-p)
-        `(unless (mutex-value ,mutex)
-          (unwind-protect
-               (progn
-                 (setf (mutex-value ,mutex) (or ,value t))
-                 ,@body)
-            (setf (mutex-value ,mutex) nil))))
-       (t 
-        `(progn ,@body))))
+(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))
 
 ;;; what's the best thing to do with these on unithread?  commented
 ;;; functions are the thread versions, just to remind me what they do