36 lines
1014 B
Factor
36 lines
1014 B
Factor
! Copyright (C) 2004, 2005 Slava Pestov.
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! Copyright (C) 2005 Mackenzie Straight.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: threads
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USING: errors io-internals kernel kernel-internals lists
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namespaces ;
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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 ) 9 getenv ;
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: set-run-queue ( queue -- ) 9 setenv ;
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: init-threads ( -- ) <queue> set-run-queue ;
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: next-thread ( -- quot )
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run-queue dup queue-empty? [
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drop f
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] [
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deque set-run-queue
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] ifte ;
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: schedule-thread ( quot -- )
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run-queue enque set-run-queue ;
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: stop ( -- )
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! This definition gets replaced by the Unix and Win32 I/O
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! code.
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next-thread [ call ] [ "No more tasks" throw ] 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 stop or
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#! yield.
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[ schedule-thread stop ] callcc0 ;
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