/
pprof.go
71 lines (61 loc) · 1.12 KB
/
pprof.go
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package pprof
import (
"io"
"runtime/pprof"
"sync"
)
var c struct {
sync.Mutex
ref int64
fn func()
Collector
}
type Collector interface {
StartCPUProfile(w io.Writer) error
StopCPUProfile()
}
func DefaultCollector() Collector { return defaultCollector{} }
type defaultCollector struct{}
func (c defaultCollector) StartCPUProfile(w io.Writer) error { return pprof.StartCPUProfile(w) }
func (c defaultCollector) StopCPUProfile() { pprof.StopCPUProfile() }
func StartCPUProfile(w io.Writer) error {
c.Lock()
defer c.Unlock()
if c.Collector == nil {
c.Collector = defaultCollector{}
}
err := c.StartCPUProfile(w)
if err == nil {
c.ref++
}
return err
}
func StopCPUProfile() {
c.Lock()
defer c.Unlock()
c.StopCPUProfile()
if c.ref--; c.ref == 0 && c.fn != nil {
c.fn()
c.fn = nil
}
}
func SetCollector(collector Collector) {
c.Lock()
if c.ref == 0 {
c.Collector = collector
c.Unlock()
return
}
ch := make(chan struct{})
fn := c.fn
c.fn = func() {
if fn != nil {
fn()
}
c.Collector = collector
close(ch)
}
c.Unlock()
<-ch
}
func ResetCollector() { SetCollector(nil) }