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move threads-are-not-OS-threads docs from 10 to 1.1.13

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svn: r12501
This commit is contained in:
Matthew Flatt 2008-11-18 23:22:56 +00:00
parent a01728e63a
commit f81826e792
2 changed files with 9 additions and 7 deletions
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8
collects/scribblings/reference/concurrency.scrbl
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@ -3,11 +3,9 @@
@title[#:tag "concurrency" #:style 'toc]{Concurrency}
PLT Scheme supports multiple threads of control within a
program. Threads run concurrently, in the sense that one thread can
preempt another without its cooperation, but threads currently all run
on the same processor (i.e., the same underlying OS process and
thread).
PLT Scheme supports multiple threads of control within a program,
thread-local storage, some primitive synchronization mechanisms, and a
framework for composing synchronization abstractions.
@local-table-of-contents[]

8
collects/scribblings/reference/eval-model.scrbl
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@ -650,8 +650,12 @@ escape-continuation aborts can cross continuation barriers.
@;------------------------------------------------------------------------
@section[#:tag "thread-model"]{Threads}
Scheme supports multiple, pre-emptive @deftech{threads} of
evaluation. Threads are created explicitly by functions such as @scheme[thread].
Scheme supports multiple @deftech{threads} of evaluation. Threads run
concurrently, in the sense that one thread can preempt another without
its cooperation, but threads currently all run on the same processor
(i.e., the same underlying OS process and thread).
Threads are created explicitly by functions such as @scheme[thread].
In terms of the evaluation model, each step in evaluation actually consists of multiple concurrent
expressions, up to one per thread, rather than a single expression. The expressions all
share the same objects and top-level variables, so that they can