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author | Matthew Heon <matthew.heon@gmail.com> | 2017-11-01 11:24:59 -0400 |
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committer | Matthew Heon <matthew.heon@gmail.com> | 2017-11-01 11:24:59 -0400 |
commit | a031b83a09a8628435317a03f199cdc18b78262f (patch) | |
tree | bc017a96769ce6de33745b8b0b1304ccf38e9df0 /vendor/golang.org/x/net/http2/writesched_random.go | |
parent | 2b74391cd5281f6fdf391ff8ad50fd1490f6bf89 (diff) | |
download | podman-a031b83a09a8628435317a03f199cdc18b78262f.tar.gz podman-a031b83a09a8628435317a03f199cdc18b78262f.tar.bz2 podman-a031b83a09a8628435317a03f199cdc18b78262f.zip |
Initial checkin from CRI-O repo
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Diffstat (limited to 'vendor/golang.org/x/net/http2/writesched_random.go')
-rw-r--r-- | vendor/golang.org/x/net/http2/writesched_random.go | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/vendor/golang.org/x/net/http2/writesched_random.go b/vendor/golang.org/x/net/http2/writesched_random.go new file mode 100644 index 000000000..36d7919f1 --- /dev/null +++ b/vendor/golang.org/x/net/http2/writesched_random.go @@ -0,0 +1,72 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package http2 + +import "math" + +// NewRandomWriteScheduler constructs a WriteScheduler that ignores HTTP/2 +// priorities. Control frames like SETTINGS and PING are written before DATA +// frames, but if no control frames are queued and multiple streams have queued +// HEADERS or DATA frames, Pop selects a ready stream arbitrarily. +func NewRandomWriteScheduler() WriteScheduler { + return &randomWriteScheduler{sq: make(map[uint32]*writeQueue)} +} + +type randomWriteScheduler struct { + // zero are frames not associated with a specific stream. + zero writeQueue + + // sq contains the stream-specific queues, keyed by stream ID. + // When a stream is idle or closed, it's deleted from the map. + sq map[uint32]*writeQueue + + // pool of empty queues for reuse. + queuePool writeQueuePool +} + +func (ws *randomWriteScheduler) OpenStream(streamID uint32, options OpenStreamOptions) { + // no-op: idle streams are not tracked +} + +func (ws *randomWriteScheduler) CloseStream(streamID uint32) { + q, ok := ws.sq[streamID] + if !ok { + return + } + delete(ws.sq, streamID) + ws.queuePool.put(q) +} + +func (ws *randomWriteScheduler) AdjustStream(streamID uint32, priority PriorityParam) { + // no-op: priorities are ignored +} + +func (ws *randomWriteScheduler) Push(wr FrameWriteRequest) { + id := wr.StreamID() + if id == 0 { + ws.zero.push(wr) + return + } + q, ok := ws.sq[id] + if !ok { + q = ws.queuePool.get() + ws.sq[id] = q + } + q.push(wr) +} + +func (ws *randomWriteScheduler) Pop() (FrameWriteRequest, bool) { + // Control frames first. + if !ws.zero.empty() { + return ws.zero.shift(), true + } + // Iterate over all non-idle streams until finding one that can be consumed. + for _, q := range ws.sq { + if wr, ok := q.consume(math.MaxInt32); ok { + return wr, true + } + } + return FrameWriteRequest{}, false +} |