runtime: correct various Go -> C function calls
Some things get converted.
Other things (too complex or too many C deps) get onM calls.
Other things (too simple) get #pragma textflag NOSPLIT.
After this CL, the offending function list is basically:
- panic.c
- netpoll.goc
- mem*.c
- race stuff
- readgstatus
- entersyscall/exitsyscall
LGTM=r, iant
R=golang-codereviews, r, iant
CC=dvyukov, golang-codereviews, khr
https://golang.org/cl/140930043
diff --git a/src/pkg/runtime/runtime.go b/src/pkg/runtime/runtime.go
new file mode 100644
index 0000000..d5b3155
--- /dev/null
+++ b/src/pkg/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
+}
