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Update NEWS for changes to port buffering.

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* NEWS: Update.
This commit is contained in:
Andy Wingo 2016-04-08 20:56:41 +02:00
parent 8399e7af51
commit f5a0c167f6
1 changed files with 34 additions and 3 deletions
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37
NEWS
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@ -12,6 +12,13 @@ releasing 2.1.3.
Changes in 2.1.3 (changes since the 2.1.2 alpha release):
* Notable changes
** All ports are now buffered, can be targets of `setvbuf'
See "Buffering" in the manual, for more. A port with a buffer size of 1
is equivalent to an unbuffered port. Ports may set their default buffer
sizes, and some ports (for example soft ports) are unbuffered by default
for historical reasons.
* New deprecations
** `_IONBF', `_IOLBF', and `_IOFBF'
@ -19,18 +26,27 @@ Instead, use the symbol values `none', `line', or `block', respectively,
as arguments to the `setvbuf' function.
* Incompatible changes
** Remove `scm_set_port_mark'
** API to define new port types from C has changed
In Guile 2.2 the API used to define new port types has changed. This
largely shouldn't affect port users, modulo the buffering port mentioned
above. However, in order to enable all ports to have buffers
implemented in the same way, which is a prerequisite to non-blocking
I/O, the port API has changed. See "I/O Extensions" in the manual, for
full details. Notably:
*** Remove `scm_set_port_mark'
Port mark functions have not been called since the switch to the BDW
garbage collector.
** Remove `scm_set_port_equalp'
*** Remove `scm_set_port_equalp'
Likewise port equal functions weren't being called. Given that ports
have their own internal buffers, it doesn't make sense to hook them into
equal? anyway.
** Remove `scm_set_port_free'
*** Remove `scm_set_port_free'
It used to be that if an open port became unreachable, a special "free"
function would be called instead of the "close" function. Now that the
@ -41,6 +57,21 @@ overhead. For that reason Guile exposes a new interface,
`scm_set_port_needs_close_on_gc', allowing port implementations to
indicate to Guile whether they need closing on GC or not.
*** Remove `scm_set_port_end_input', `scm_set_port_flush'
As buffering is handled by Guile itself, these functions which were to
manage an implementation-side buffer are no longer needed.
*** Change prototype of `scm_make_port_type'
The `read' (renamed from `fill_input') and `write' functions now return
void and take a port buffer.
*** Remove `SCM_INITIAL_PUTBACK_BUF_SIZE', `SCM_READ_BUFFER_EMPTY_P'
Probably nobody used these.
Changes in 2.1.2 (changes since the 2.1.1 alpha release):