X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fthread.lisp;h=a44b7630b6328013fdddbe483db17d9814f396ee;hb=d25e3478acccec70402ff32554669a982be8e281;hp=6e6ebecd26041488d5f5170fba61f18ca45bc466;hpb=068cf4b55af3f8f8acf2c7c06869441612261cd4;p=sbcl.git diff --git a/src/code/thread.lisp b/src/code/thread.lisp index 6e6ebec..a44b763 100644 --- a/src/code/thread.lisp +++ b/src/code/thread.lisp @@ -21,11 +21,17 @@ #!+(and sb-lutex sb-thread) (lutex (make-lutex))) -;;; FIXME: We probably want to rename the accessor MUTEX-OWNER. (defun mutex-value (mutex) - "Current owner of the mutex, NIL if the mutex is free." + "Current owner of the mutex, NIL if the mutex is free. May return a +stale value, use MUTEX-OWNER instead." (mutex-%owner mutex)) +(defun holding-mutex-p (mutex) + "Test whether the current thread is holding MUTEX." + ;; This is about the only use for which a stale value of owner is + ;; sufficient. + (eq sb!thread:*current-thread* (mutex-%owner mutex))) + (defsetf mutex-value set-mutex-value) (declaim (inline set-mutex-value)) @@ -58,7 +64,9 @@ and the mutex is in use, sleep until it is available" ,value ,wait-p))) -(sb!xc:defmacro with-system-mutex ((mutex &key without-gcing allow-with-interrupts) &body body) +(sb!xc:defmacro with-system-mutex ((mutex + &key without-gcing allow-with-interrupts) + &body body) `(dx-flet ((with-system-mutex-thunk () ,@body)) (,(cond (without-gcing 'call-with-system-mutex/without-gcing) @@ -109,25 +117,44 @@ provided the default value is used for the mutex." #'with-spinlock-thunk ,spinlock))) -;;; KLUDGE: this separate implementation 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. +(macrolet ((def (name &optional variant) + `(defun ,(if variant (symbolicate name "/" variant) name) + (function mutex) + (declare (function function)) + (flet ((%call-with-system-mutex () + (dx-let (got-it) + (unwind-protect + (when (setf got-it (get-mutex mutex)) + (funcall function)) + (when got-it + (release-mutex mutex)))))) + (declare (inline %call-with-system-mutex)) + ,(ecase variant + (:without-gcing + `(without-gcing (%call-with-system-mutex))) + (:allow-with-interrupts + `(without-interrupts + (allow-with-interrupts (%call-with-system-mutex)))) + ((nil) + `(without-interrupts (%call-with-system-mutex)))))))) + (def call-with-system-mutex) + (def call-with-system-mutex :without-gcing) + (def call-with-system-mutex :allow-with-interrupts)) + #!-sb-thread (progn (macrolet ((def (name &optional variant) - `(defun ,(if variant (symbolicate name "/" variant) name) (function lock) + `(defun ,(if variant (symbolicate name "/" variant) name) + (function lock) (declare (ignore lock) (function function)) ,(ecase variant (:without-gcing `(without-gcing (funcall function))) (:allow-with-interrupts - `(without-interrupts (allow-with-interrupts (funcall function)))) + `(without-interrupts + (allow-with-interrupts (funcall function)))) ((nil) `(without-interrupts (funcall function))))))) - (def call-with-system-mutex) - (def call-with-system-mutex :without-gcing) - (def call-with-system-mutex :allow-with-interrupts) (def call-with-system-spinlock) (def call-with-recursive-system-spinlock) (def call-with-recursive-system-spinlock :without-gcing)) @@ -154,28 +181,6 @@ provided the default value is used for the mutex." ;;; closes over GOT-IT causes a value-cell to be allocated for it -- ;;; and we prefer that to go on the stack since it can. (progn - (macrolet ((def (name &optional variant) - `(defun ,(if variant (symbolicate name "/" variant) name) (function mutex) - (declare (function function)) - (flet ((%call-with-system-mutex () - (dx-let (got-it) - (unwind-protect - (when (setf got-it (get-mutex mutex)) - (funcall function)) - (when got-it - (release-mutex mutex)))))) - (declare (inline %call-with-system-mutex)) - ,(ecase variant - (:without-gcing - `(without-gcing (%call-with-system-mutex))) - (:allow-with-interrupts - `(without-interrupts (allow-with-interrupts (%call-with-system-mutex)))) - ((nil) - `(without-interrupts (%call-with-system-mutex)))))))) - (def call-with-system-mutex) - (def call-with-system-mutex :without-gcing) - (def call-with-system-mutex :allow-with-interrupts)) - (defun call-with-system-spinlock (function spinlock) (declare (function function)) (without-interrupts @@ -187,13 +192,18 @@ provided the default value is used for the mutex." (release-spinlock spinlock)))))) (macrolet ((def (name &optional variant) - `(defun ,(if variant (symbolicate name "/" variant) name) (function spinlock) + `(defun ,(if variant (symbolicate name "/" variant) name) + (function spinlock) (declare (function function)) (flet ((%call-with-system-spinlock () - (dx-let ((inner-lock-p (eq *current-thread* (spinlock-value spinlock))) + (dx-let ((inner-lock-p + (eq *current-thread* + (spinlock-value spinlock))) (got-it nil)) (unwind-protect - (when (or inner-lock-p (setf got-it (get-spinlock spinlock))) + (when (or inner-lock-p + (setf got-it + (get-spinlock spinlock))) (funcall function)) (when got-it (release-spinlock spinlock)))))) @@ -240,8 +250,6 @@ provided the default value is used for the mutex." (when got-it (release-mutex mutex)))))) - - (defun call-with-recursive-spinlock (function spinlock) (declare (function function)) (dx-let ((inner-lock-p (eq (spinlock-value spinlock) *current-thread*))