X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fthread.lisp;h=85eb1c82dadf4a8df6f7551a9756a7ca6b2ddab0;hb=23e31980c78d174ef9cb775bf28f970890327fea;hp=cd4ca4f16925f77585ce5c8a1c02ea4916f27b3f;hpb=f16e090088c6aa6178ecf50a8b74ff41cce73640;p=sbcl.git diff --git a/src/code/thread.lisp b/src/code/thread.lisp index cd4ca4f..85eb1c8 100644 --- a/src/code/thread.lisp +++ b/src/code/thread.lisp @@ -11,53 +11,273 @@ (in-package "SB!THREAD") -(sb!xc:defmacro with-mutex ((mutex &key value (wait-p t)) &body body) +(def!type thread-name () + 'simple-string) + +(def!struct (thread (:constructor %make-thread)) + #!+sb-doc + "Thread type. Do not rely on threads being structs as it may change +in future versions." + (name nil :type (or thread-name null)) + (%alive-p nil :type boolean) + (os-thread nil :type (or integer null)) + (interruptions nil :type list) + (result nil :type list) + (interruptions-lock + (make-mutex :name "thread interruptions lock") + :type mutex) + (result-lock + (make-mutex :name "thread result lock") + :type mutex) + waiting-for) + +(def!struct mutex #!+sb-doc - "Acquire MUTEX for the dynamic scope of BODY, setting it to -NEW-VALUE or some suitable default value if NIL. If WAIT-P is non-NIL -and the mutex is in use, sleep until it is available" - #!-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)) + "Mutex type." + (name nil :type (or null thread-name)) + (%owner nil :type (or null thread)) + #!+(and (not sb-lutex) sb-thread) + (state 0 :type fixnum) + #!+(and sb-lutex sb-thread) + (lutex (make-lutex))) + +(defun mutex-value (mutex) + "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)) +(defun set-mutex-value (mutex value) + (declare (ignore mutex value)) + (error "~S is no longer supported." '(setf mutex-value))) + +(define-compiler-macro set-mutex-value (&whole form mutex value) + (declare (ignore mutex value)) + (warn "~S is no longer supported, and will signal an error at runtime." + '(setf mutex-value)) + form) + +(def!struct spinlock + #!+sb-doc + "Spinlock type." + (name nil :type (or null thread-name)) + (value nil)) + +(sb!xc:defmacro with-mutex ((mutex &key (value '*current-thread*) (wait-p t)) + &body body) + #!+sb-doc + "Acquire MUTEX for the dynamic scope of BODY, setting it to VALUE or +some suitable default value if NIL. If WAIT-P is non-NIL and the mutex +is in use, sleep until it is available" + `(dx-flet ((with-mutex-thunk () ,@body)) + (call-with-mutex + #'with-mutex-thunk + ,mutex + ,value + ,wait-p))) + +(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) + (allow-with-interrupts + 'call-with-system-mutex/allow-with-interrupts) + (t + 'call-with-system-mutex)) + #'with-system-mutex-thunk + ,mutex))) + +(sb!xc:defmacro with-system-spinlock ((spinlock &key) &body body) + `(dx-flet ((with-system-spinlock-thunk () ,@body)) + (call-with-system-spinlock + #'with-system-spinlock-thunk + ,spinlock))) (sb!xc:defmacro with-recursive-lock ((mutex) &body body) #!+sb-doc "Acquires MUTEX for the dynamic scope of BODY. Within that scope -further recursive lock attempts for the same mutex succeed. However, -it is an error to mix WITH-MUTEX and WITH-RECURSIVE-LOCK for the same -mutex." - #!-sb-thread (declare (ignore mutex)) - #!+sb-thread - (with-unique-names (cfp inner-lock) - `(let ((,cfp (sb!kernel:current-fp)) - (,inner-lock - (and (mutex-value ,mutex) - (sb!vm:control-stack-pointer-valid-p - (sb!sys:int-sap - (sb!kernel:get-lisp-obj-address (mutex-value ,mutex))))))) - (unless ,inner-lock - ;; this punning with MAKE-LISP-OBJ depends for its safety on - ;; the frame pointer being a lispobj-aligned integer. While - ;; it is, then MAKE-LISP-OBJ will always return a FIXNUM, so - ;; we're safe to do that. Should this ever change, this - ;; MAKE-LISP-OBJ could return something that looks like a - ;; pointer, but pointing into neverneverland, which will - ;; confuse GC completely. -- CSR, 2003-06-03 - (get-mutex ,mutex (sb!kernel:make-lisp-obj (sb!sys:sap-int ,cfp)))) - (unwind-protect - (locally ,@body) - (unless ,inner-lock - (release-mutex ,mutex))))) - #!-sb-thread - `(locally ,@body)) +further recursive lock attempts for the same mutex succeed. It is +allowed to mix WITH-MUTEX and WITH-RECURSIVE-LOCK for the same mutex +provided the default value is used for the mutex." + `(dx-flet ((with-recursive-lock-thunk () ,@body)) + (call-with-recursive-lock + #'with-recursive-lock-thunk + ,mutex))) + +(sb!xc:defmacro with-recursive-spinlock ((spinlock) &body body) + `(dx-flet ((with-recursive-spinlock-thunk () ,@body)) + (call-with-recursive-spinlock + #'with-recursive-spinlock-thunk + ,spinlock))) + +(sb!xc:defmacro with-recursive-system-spinlock ((spinlock + &key without-gcing) + &body body) + `(dx-flet ((with-recursive-system-spinlock-thunk () ,@body)) + (,(cond (without-gcing + 'call-with-recursive-system-spinlock/without-gcing) + (t + 'call-with-recursive-system-spinlock)) + #'with-recursive-system-spinlock-thunk + ,spinlock))) + +(sb!xc:defmacro with-spinlock ((spinlock) &body body) + `(dx-flet ((with-spinlock-thunk () ,@body)) + (call-with-spinlock + #'with-spinlock-thunk + ,spinlock))) + +(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) + (declare (ignore lock) (function function)) + ,(ecase variant + (:without-gcing + `(without-gcing (funcall function))) + (:allow-with-interrupts + `(without-interrupts + (allow-with-interrupts (funcall function)))) + ((nil) + `(without-interrupts (funcall function))))))) + (def call-with-system-spinlock) + (def call-with-recursive-system-spinlock) + (def call-with-recursive-system-spinlock :without-gcing)) + + (defun call-with-mutex (function mutex value waitp) + (declare (ignore mutex value waitp) + (function function)) + (funcall function)) + + (defun call-with-recursive-lock (function mutex) + (declare (ignore mutex) (function function)) + (funcall function)) + + (defun call-with-spinlock (function spinlock) + (declare (ignore spinlock) (function function)) + (funcall function)) + + (defun call-with-recursive-spinlock (function spinlock) + (declare (ignore spinlock) (function function)) + (funcall function))) + +#!+sb-thread +;;; KLUDGE: These need to use DX-LET, because the cleanup form that +;;; 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 + (defun call-with-system-spinlock (function spinlock) + (declare (function function)) + (without-interrupts + (dx-let (got-it) + (unwind-protect + (when (setf got-it (get-spinlock spinlock)) + (funcall function)) + (when got-it + (release-spinlock spinlock)))))) + + (macrolet ((def (name &optional variant) + `(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))) + (got-it nil)) + (unwind-protect + (when (or inner-lock-p + (setf got-it + (get-spinlock spinlock))) + (funcall function)) + (when got-it + (release-spinlock spinlock)))))) + (declare (inline %call-with-system-spinlock)) + ,(ecase variant + (:without-gcing + `(without-gcing (%call-with-system-spinlock))) + ((nil) + `(without-interrupts (%call-with-system-spinlock)))))))) + (def call-with-recursive-system-spinlock) + (def call-with-recursive-system-spinlock :without-gcing)) + + (defun call-with-spinlock (function spinlock) + (declare (function function)) + (dx-let ((got-it nil)) + (without-interrupts + (unwind-protect + (when (setf got-it (allow-with-interrupts + (get-spinlock spinlock))) + (with-local-interrupts (funcall function))) + (when got-it + (release-spinlock spinlock)))))) + + (defun call-with-mutex (function mutex value waitp) + (declare (function function)) + (dx-let ((got-it nil)) + (without-interrupts + (unwind-protect + (when (setq got-it (allow-with-interrupts + (get-mutex mutex value waitp))) + (with-local-interrupts (funcall function))) + (when got-it + (release-mutex mutex)))))) + + (defun call-with-recursive-lock (function mutex) + (declare (function function)) + (dx-let ((inner-lock-p (eq (mutex-%owner mutex) *current-thread*)) + (got-it nil)) + (without-interrupts + (unwind-protect + (when (or inner-lock-p (setf got-it (allow-with-interrupts + (get-mutex mutex)))) + (with-local-interrupts (funcall function))) + (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*)) + (got-it nil)) + (without-interrupts + (unwind-protect + (when (or inner-lock-p (setf got-it (allow-with-interrupts + (get-spinlock spinlock)))) + (with-local-interrupts (funcall function))) + (when got-it + (release-spinlock spinlock)))))))