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add noDuplicate#
author
Simon Marlow
<simonmar@microsoft.com>
Tue, 6 Mar 2007 14:31:12 +0000
(14:31 +0000)
committer
Simon Marlow
<simonmar@microsoft.com>
Tue, 6 Mar 2007 14:31:12 +0000
(14:31 +0000)
This primop ensures that the current computation is not being
duplicated, by calling threadPaused(). The idea is to use it inside
unsafePerformIO/unsafeInterleaveIO (see #986).
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