Releasing memory proceeds until there is (-NOFL_BLOCK_SIZE,0] bytes to
release; we should only expand when the number of bytes to reacquire is
large enough.
This fixes an issue in which minor collection of a nursery full of live
data can fail because of fragmentation, whereas really it should just
fall back to promotion.
If two tracer threads visit edges to the same object on an evacuation
candidate block, and they first see that the object is unmarked, then
they both try to evacuate it at the same time. Thread A might try and
fail before thread B manages to acquire the forwarding word. B needs to
see that A marked it in place, and to do that it needs to re-load the
mark byte after acquiring the forwarding word. Otherwise perhaps B
could succeed and you would end up with two copies of an object, one of
them garbled!
This allows field logging to proceed during collection, which might add
new edge buffers. Also fix a bug that would cause debug-mode assertion
failures, where clearing a field set didn't clear edge buffer next
pointers.
Store allocations in a splay tree so that we can efficiently map from an
edge originating in the lospace to its object. Defer returning memory
to the OS to a periodic background thread, using a similar strategy as
for nofl and copy-space pages. Use a size-segregated freelist instead
of requiring a full best-fit search for those pages that haven't yet
been returned to the OS.
Looking at the SRFI-19 specification, the argument is called `day', not
`date'. Even the accessor is called `date-day'. So adjust the
documentation to match.
Also adjust the (web http) module, which was using `date' as well.
* doc/ref/srfi-modules.texi (SRFI-19 Date): Use `day' instead of `date'.
* module/web/http.scm (parse-rfc-822-date, parse-rfc-850-date)
(parse-asctime-date): Same.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This is an import of the 'Abstract', 'Rationale', and 'Specification'
sections from the upstream specification text, with some manual
adjustment.
* doc/ref/srfi-modules.texi (SRFI 64): New subsection.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
* test-suite/tests/peg.test (comment-grammar): Z can be anything.
("simple comment with forbidden char"): Remove.
(html-grammar, html-example): New variables.
("parsing with complex grammars"): New test.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
* module/ice-9/peg/string-peg.scm (peg-as-peg): Augment with rules for
hexadecimal digits, “\uXXX” for characters, “\t” for tabs, etc.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
