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Update NEWS.

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* NEWS: Update.
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Andy Wingo 2016-12-06 22:33:38 +01:00
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25
NEWS
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@ -9,7 +9,26 @@ Please send Guile bug reports to bug-guile@gnu.org.
Changes in 2.1.5 (changes since the 2.1.4 alpha release):
* Notable changes
* New interfaces
** Lightweight pre-emptive threading primitives
The compiler now inserts special "handle-interrupts" opcodes before each
call, return, and loop back-edge. This allows the user to interrupt any
computation and to accurately profile code using interrupts. It used to
be that interrupts were run by calling a C function from the VM; now
interrupt thunks are run directly from the VM. This allows interrupts
to save a delimited continuation and, if the continuation was
established from the same VM invocation (the usual restriction), that
continuation can then be resumed. In this way users can implement
lightweight pre-emptive threading facilities.
** with-dynamic-state in VM
Similarly, `with-dynamic-state' no longer recurses out of the VM,
allowing captured delimited continuations that include a
`with-dynamic-state' invocation to be resumed. This is a precondition
to allow lightweight threading libraries to establish a dynamic state
per thread.
* Performance improvements
** Mutexes are now faster under contention
@ -96,8 +115,8 @@ dynamic state simply captures the current values, and calling
`with-dynamic-state' copies those values into the Guile virtual machine
instead of aliasing them in a way that could allow them to be mutated in
place. This change allows Guile's fluid variables to be thread-safe.
To capture the locations of a dynamic state, use partial continuations
instead.
To capture the locations of a dynamic state, capture a
`with-dynamic-state' invocation using partial continuations instead.
* New deprecations
** Arbiters deprecated