diff options
Diffstat (limited to 'vendor/github.com/pquerna/ffjson/fflib/v1/buffer_pool.go')
-rw-r--r-- | vendor/github.com/pquerna/ffjson/fflib/v1/buffer_pool.go | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_pool.go b/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_pool.go deleted file mode 100644 index a021c57cf..000000000 --- a/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_pool.go +++ /dev/null @@ -1,105 +0,0 @@ -// Copyright 2009 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. - -// +build go1.3 - -package v1 - -// Allocation pools for Buffers. - -import "sync" - -var pools [14]sync.Pool -var pool64 *sync.Pool - -func init() { - var i uint - // TODO(pquerna): add science here around actual pool sizes. - for i = 6; i < 20; i++ { - n := 1 << i - pools[poolNum(n)].New = func() interface{} { return make([]byte, 0, n) } - } - pool64 = &pools[0] -} - -// This returns the pool number that will give a buffer of -// at least 'i' bytes. -func poolNum(i int) int { - // TODO(pquerna): convert to log2 w/ bsr asm instruction: - // <https://groups.google.com/forum/#!topic/golang-nuts/uAb5J1_y7ns> - if i <= 64 { - return 0 - } else if i <= 128 { - return 1 - } else if i <= 256 { - return 2 - } else if i <= 512 { - return 3 - } else if i <= 1024 { - return 4 - } else if i <= 2048 { - return 5 - } else if i <= 4096 { - return 6 - } else if i <= 8192 { - return 7 - } else if i <= 16384 { - return 8 - } else if i <= 32768 { - return 9 - } else if i <= 65536 { - return 10 - } else if i <= 131072 { - return 11 - } else if i <= 262144 { - return 12 - } else if i <= 524288 { - return 13 - } else { - return -1 - } -} - -// Send a buffer to the Pool to reuse for other instances. -// You may no longer utilize the content of the buffer, since it may be used -// by other goroutines. -func Pool(b []byte) { - if b == nil { - return - } - c := cap(b) - - // Our smallest buffer is 64 bytes, so we discard smaller buffers. - if c < 64 { - return - } - - // We need to put the incoming buffer into the NEXT buffer, - // since a buffer guarantees AT LEAST the number of bytes available - // that is the top of this buffer. - // That is the reason for dividing the cap by 2, so it gets into the NEXT bucket. - // We add 2 to avoid rounding down if size is exactly power of 2. - pn := poolNum((c + 2) >> 1) - if pn != -1 { - pools[pn].Put(b[0:0]) - } - // if we didn't have a slot for this []byte, we just drop it and let the GC - // take care of it. -} - -// makeSlice allocates a slice of size n -- it will attempt to use a pool'ed -// instance whenever possible. -func makeSlice(n int) []byte { - if n <= 64 { - return pool64.Get().([]byte)[0:n] - } - - pn := poolNum(n) - - if pn != -1 { - return pools[pn].Get().([]byte)[0:n] - } else { - return make([]byte, n) - } -} |