;;; saved value. When that hander returns, the original signal mask is
;;; installed, allowing any other pending signals to be handled.
;;;
-;;; This means that the cost of without-interrupts is just a special
+;;; This means that the cost of WITHOUT-INTERRUPTS is just a special
;;; binding in the case when no signals are delivered (the normal
;;; case). It's only when a signal is actually delivered that we use
;;; any system calls, and by then the cost of the extra system calls
;;; are lost in the noise when compared with the cost of delivering
;;; the signal in the first place.
-;;; Magically converted by the compiler into a break instruction.
-(defun do-pending-interrupt ()
- (do-pending-interrupt))
-
-#!-gengc (progn
-
(defvar *interrupts-enabled* t)
(defvar *interrupt-pending* nil)
(when *interrupt-pending*
(do-pending-interrupt))
(,name))))))
-
-) ; PROGN
-
-;;; On the GENGC system, we have to do it slightly differently because of the
-;;; existence of threads. Each thread has a suspends_disabled_count in its
-;;; mutator structure. When this value is other then zero, the low level stuff
-;;; will not suspend the thread, but will instead set the suspend_pending flag
-;;; (also in the mutator). So when we finish the without-interrupts, we just
-;;; check the suspend_pending flag and trigger a do-pending-interrupt if
-;;; necessary.
-
-#!+gengc
-(defmacro without-interrupts (&body body)
- `(unwind-protect
- (progn
- (locally
- (declare (optimize (speed 3) (safety 0)))
- (incf (sb!kernel:mutator-interrupts-disabled-count)))
- ,@body)
- (locally
- (declare (optimize (speed 3) (safety 0)))
- (when (and (zerop (decf (sb!kernel:mutator-interrupts-disabled-count)))
- (not (zerop (sb!kernel:mutator-interrupt-pending))))
- (do-pending-interrupt)))))
\f
;;;; utilities for dealing with signal names and numbers
#!+svr4
(!def-unix-signal :SIGWAITING 32) ; Process's LWPs are blocked.
-(sb!xc:defmacro sigmask (&rest signals)
- #!+sb-doc
- "Returns a mask given a set of signals."
- (apply #'logior
- (mapcar (lambda (signal)
- (ash 1 (1- (unix-signal-number signal))))
- signals)))
-
(/show0 "done with signal.lisp")