* [PATCH 2/2] buffer: allow limiting the amount of bytes output
@ 2015-02-18 22:23 7% ` Eric Wong
0 siblings, 0 replies; 1+ results
From: Eric Wong @ 2015-02-18 22:23 UTC (permalink / raw)
To: dtas-all
This will aid in allowing us to create effects which affect
only a certain part of a track.
---
lib/dtas/buffer.rb | 6 +++---
lib/dtas/buffer/read_write.rb | 9 +++++----
lib/dtas/buffer/splice.rb | 9 +++++----
3 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/lib/dtas/buffer.rb b/lib/dtas/buffer.rb
index b03ed8a..23b0b77 100644
--- a/lib/dtas/buffer.rb
+++ b/lib/dtas/buffer.rb
@@ -48,14 +48,14 @@ def __dst_error(dst, e)
# - subset of targets array for :wait_writable
# - some type of StandardError
# - nil
- def broadcast(targets)
+ def broadcast(targets, limit = nil)
case targets.size
when 0
:ignore # this will pause decoders
when 1
- broadcast_one(targets)
+ broadcast_one(targets, limit)
else # infinity
- broadcast_inf(targets)
+ broadcast_inf(targets, limit)
end
end
diff --git a/lib/dtas/buffer/read_write.rb b/lib/dtas/buffer/read_write.rb
index a27b823..64ad297 100644
--- a/lib/dtas/buffer/read_write.rb
+++ b/lib/dtas/buffer/read_write.rb
@@ -26,9 +26,9 @@ def discard(bytes)
end
# always block when we have a single target
- def broadcast_one(targets)
+ def broadcast_one(targets, limit = nil)
buf = _rbuf
- @to_io.read_nonblock(MAX_AT_ONCE, buf)
+ @to_io.read_nonblock(limit || MAX_AT_ONCE, buf)
n = targets[0].write(buf) # IO#write has write-in-full behavior
@bytes_xfer += n
:wait_readable
@@ -42,7 +42,7 @@ def broadcast_one(targets)
nil # do not return error here, we already spewed an error message
end
- def broadcast_inf(targets)
+ def broadcast_inf(targets, limit = nil)
nr_nb = targets.count(&:nonblock?)
if nr_nb == 0 || nr_nb == targets.size
# if all targets are full, don't start until they're all writable
@@ -61,7 +61,8 @@ def broadcast_inf(targets)
# don't pin too much on one target
bytes = inflight
- bytes = bytes > MAX_AT_ONCE ? MAX_AT_ONCE : bytes
+ limit ||= MAX_AT_ONCE
+ bytes = bytes > limit ? limit : bytes
buf = _rbuf
@to_io.read(bytes, buf)
n = buf.bytesize
diff --git a/lib/dtas/buffer/splice.rb b/lib/dtas/buffer/splice.rb
index b987f3a..02ce877 100644
--- a/lib/dtas/buffer/splice.rb
+++ b/lib/dtas/buffer/splice.rb
@@ -28,9 +28,10 @@ def discard(bytes)
IO.splice(@to_io, nil, DEVNULL, nil, bytes)
end
- def broadcast_one(targets)
+ def broadcast_one(targets, limit = nil)
# single output is always non-blocking
- s = IO.trysplice(@to_io, nil, targets[0], nil, MAX_AT_ONCE_1, F_MOVE)
+ limit ||= MAX_AT_ONCE_1
+ s = IO.trysplice(@to_io, nil, targets[0], nil, limit, F_MOVE)
if Symbol === s
targets # our one and only target blocked on write
else
@@ -88,7 +89,7 @@ def __broadcast_tee(blocked, targets, chunk_size)
most_teed
end
- def broadcast_inf(targets)
+ def broadcast_inf(targets, limit = nil)
if targets.all?(&:ready_write_optimized?)
blocked = []
elsif targets.none?(&:nonblock?)
@@ -105,7 +106,7 @@ def broadcast_inf(targets)
end
# don't pin too much on one target
- bytes = MAX_AT_ONCE
+ bytes = limit || MAX_AT_ONCE
last = targets.pop # we splice to the last one, tee to the rest
# this may return zero if all targets were non-blocking
--
EW
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2015-02-18 22:23 [PATCH 1/2] buffer/splice: prepare for IO::Splice::WAITALL removal Eric Wong
2015-02-18 22:23 7% ` [PATCH 2/2] buffer: allow limiting the amount of bytes output Eric Wong
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