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author | Russ Cox <rsc@golang.org> | 2014-09-08 00:08:51 -0400 |
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committer | Russ Cox <rsc@golang.org> | 2014-09-08 00:08:51 -0400 |
commit | c007ce824d9a4fccb148f9204e04c23ed2984b71 (patch) | |
tree | 7dcac257114ef5c446be5b7b68c27dea230b7c09 /src/runtime/runtime.go | |
parent | 220a6de47eced55956eb8af8d643d4f5b67fd634 (diff) | |
download | go-c007ce824d9a4fccb148f9204e04c23ed2984b71.tar.gz go-c007ce824d9a4fccb148f9204e04c23ed2984b71.zip |
build: move package sources from src/pkg to src
Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.
Diffstat (limited to 'src/runtime/runtime.go')
-rw-r--r-- | src/runtime/runtime.go | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/runtime/runtime.go b/src/runtime/runtime.go new file mode 100644 index 0000000000..d5b31559a2 --- /dev/null +++ b/src/runtime/runtime.go @@ -0,0 +1,37 @@ +// 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. + +package runtime + +var ticks struct { + lock mutex + val uint64 +} + +// Note: Called by runtime/pprof in addition to runtime code. +func tickspersecond() int64 { + r := int64(atomicload64(&ticks.val)) + if r != 0 { + return r + } + lock(&ticks.lock) + r = int64(ticks.val) + if r == 0 { + t0 := nanotime() + c0 := cputicks() + usleep(100 * 1000) + t1 := nanotime() + c1 := cputicks() + if t1 == t0 { + t1++ + } + r = (c1 - c0) * 1000 * 1000 * 1000 / (t1 - t0) + if r == 0 { + r++ + } + atomicstore64(&ticks.val, uint64(r)) + } + unlock(&ticks.lock) + return r +} |