76 lines
2.4 KiB
Factor
76 lines
2.4 KiB
Factor
! :folding=none:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: threads
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USE: combinators
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USE: continuations
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USE: io-internals
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USE: kernel
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USE: lists
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USE: stack
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! Core of the multitasker. Used by io-internals.factor and
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! in-thread.factor.
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: run-queue ( -- queue )
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9 getenv ;
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: set-run-queue ( queue -- )
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9 setenv ;
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: init-threads ( -- )
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f set-run-queue ;
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: next-thread ( -- quot )
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#! Get and remove the next quotation from the run queue.
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run-queue dup [ uncons set-run-queue ] when ;
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: schedule-thread ( quot -- )
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#! Add a quotation to the run queue.
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run-queue cons set-run-queue ;
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: (yield) ( -- )
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#! If there is a quotation in the run queue, call it,
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#! otherwise wait for I/O. The currently executing
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#! continuation is suspended. Use yield instead.
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next-thread dup [
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call
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] [
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drop next-io-task dup [
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call
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] [
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drop (yield)
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] ifte
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] ifte ;
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: yield ( -- )
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#! Add the current continuation to the run queue, and yield
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#! to the next quotation. The current continuation will
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#! eventually be restored by a future call to (yield) or
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#! yield.
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[ schedule-thread (yield) ] callcc0 ;
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