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lockless version of defaultIDGenerator.NewSpanID #851

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Aug 2, 2018
Merged

lockless version of defaultIDGenerator.NewSpanID #851

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ccf275a
lockless version of defaultIDGenerator.NewSpanID
basvanbeek Aug 1, 2018
723f7d3
removed deprecated comment on needing a lock for NewSpanID
basvanbeek Aug 2, 2018
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10 changes: 3 additions & 7 deletions trace/trace.go
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Original file line number Diff line number Diff line change
Expand Up @@ -477,15 +477,11 @@ type defaultIDGenerator struct {
}

// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
// mu should be held while this function is called.
func (gen *defaultIDGenerator) NewSpanID() [8]byte {
gen.Lock()
id := gen.nextSpanID
gen.nextSpanID += gen.spanIDInc
if gen.nextSpanID == 0 {
gen.nextSpanID += gen.spanIDInc
var id uint64
for id == 0 {
id = atomic.AddUint64(&gen.nextSpanID, gen.spanIDInc)
}
gen.Unlock()
var sid [8]byte
binary.LittleEndian.PutUint64(sid[:], id)
return sid
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