X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fthread.lisp;h=09c2cc456d9252808885607cda781a5396e51d13;hb=a6a12ed609d5467ec43b411283e5b3568fee81df;hp=e1e0417fd02fa4338fb11fc4cf03555452aaef59;hpb=dcf5978d9d33098e868ae6eea28e1b310038c03d;p=sbcl.git diff --git a/src/code/thread.lisp b/src/code/thread.lisp index e1e0417..09c2cc4 100644 --- a/src/code/thread.lisp +++ b/src/code/thread.lisp @@ -1,28 +1,270 @@ +;;;; 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") +(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 + "Mutex type." + (name nil :type (or null thread-name)) + (%owner nil :type (or null thread)) + #!+(and sb-thread sb-futex) + (state 0 :type fixnum)) + +(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) + +;;; SPINLOCK no longer exists as a type -- provided for backwards compatibility. + +(deftype spinlock () + "Spinlock type." + (deprecation-warning :early "1.0.53.11" 'spinlock 'mutex) + 'mutex) + +(define-deprecated-function :early "1.0.53.11" make-spinlock make-mutex (&key name) + (make-mutex :name name)) + +(define-deprecated-function :early "1.0.53.11" spinlock-name mutex-name (lock) + (mutex-name lock)) + +(define-deprecated-function :early "1.0.53.11" (setf spinlock-name) (setf mutex-name) (name lock) + (setf (mutex-name lock) name)) + +(define-deprecated-function :early "1.0.53.11" spinlock-value mutex-owner (lock) + (mutex-owner lock)) + +(define-deprecated-function :early "1.0.53.11" get-spinlock grab-mutex (lock) + (grab-mutex lock)) + +(define-deprecated-function :early "1.0.53.11" release-spinlock release-mutex (lock) + (release-mutex lock)) + +(sb!xc:defmacro with-recursive-spinlock ((lock) &body body) + (deprecation-warning :early "1.0.53.11" 'with-recursive-spinlock 'with-recursive-lock) + `(with-recursive-lock (,lock) + ,@body)) + +(sb!xc:defmacro with-spinlock ((lock) &body body) + (deprecation-warning :early "1.0.53.11" 'with-spinlock 'with-mutex) + `(with-mutex (,lock) + ,@body)) + +(sb!xc:defmacro without-thread-waiting-for ((&key already-without-interrupts) &body body) + (with-unique-names (thread prev) + (let ((without (if already-without-interrupts + 'progn + 'without-interrupts)) + (with (if already-without-interrupts + 'progn + 'with-local-interrupts))) + `(let* ((,thread *current-thread*) + (,prev (progn + (barrier (:read)) + (thread-waiting-for ,thread)))) + (flet ((exec () ,@body)) + (if ,prev + (,without + (unwind-protect + (progn + (setf (thread-waiting-for ,thread) nil) + (barrier (:write)) + (,with (exec))) + ;; If we were waiting on a waitqueue, this becomes a bogus + ;; wakeup. + (when (mutex-p ,prev) + (setf (thread-waiting-for ,thread) ,prev) + (barrier (:write))))) + (exec))))))) + +(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-recursive-lock ((mutex) &body body) - #!+sb-thread - (with-unique-names (cfp) - `(let ((,cfp (sb!kernel:current-fp))) - (unless (and (mutex-value ,mutex) - (sb!vm:control-stack-pointer-valid-p - (sb!sys:int-sap - (sb!kernel:get-lisp-obj-address (mutex-value ,mutex))))) - ;; 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 - (progn ,@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-doc + "Acquires MUTEX for the dynamic scope of BODY. Within that scope +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-system-lock ((lock + &key without-gcing) + &body body) + `(dx-flet ((with-recursive-system-lock-thunk () ,@body)) + (,(cond (without-gcing + 'call-with-recursive-system-lock/without-gcing) + (t + 'call-with-recursive-system-lock)) + #'with-recursive-system-lock-thunk + ,lock))) + +(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 + (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-recursive-system-lock (function lock) + (declare (function function) (ignore lock)) + (without-interrupts + (funcall function))) + + (defun call-with-recursive-system-lock/without-gcing (function mutex) + (declare (function function) (ignore mutex)) + (without-gcing + (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-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)))))) + (macrolet ((def (name &optional variant) + `(defun ,(if variant (symbolicate name "/" variant) name) + (function lock) + (declare (function function)) + (flet ((%call-with-recursive-system-lock () + (dx-let ((inner-lock-p + (eq *current-thread* (mutex-owner lock))) + (got-it nil)) + (unwind-protect + (when (or inner-lock-p + (setf got-it (grab-mutex lock))) + (funcall function)) + (when got-it + (release-mutex lock)))))) + (declare (inline %call-with-recursive-system-lock)) + ,(ecase variant + (:without-gcing + `(without-gcing (%call-with-recursive-system-lock))) + ((nil) + `(without-interrupts (%call-with-recursive-system-lock)))))))) + (def call-with-recursive-system-lock) + (def call-with-recursive-system-lock :without-gcing)))