1 files changed, 25 insertions, 0 deletions
diff --git a/vendor/github.com/jtolds/gls/gid.go b/vendor/github.com/jtolds/gls/gid.go
new file mode 100644
index 0000000..c16bf3a
--- /dev/null
+++ b/vendor/github.com/jtolds/gls/gid.go
@@ -0,0 +1,25 @@
+package gls
+
+var (
+	stackTagPool = &idPool{}
+)
+
+// Will return this goroutine's identifier if set. If you always need a
+// goroutine identifier, you should use EnsureGoroutineId which will make one
+// if there isn't one already.
+func GetGoroutineId() (gid uint, ok bool) {
+	return readStackTag()
+}
+
+// Will call cb with the current goroutine identifier. If one hasn't already
+// been generated, one will be created and set first. The goroutine identifier
+// might be invalid after cb returns.
+func EnsureGoroutineId(cb func(gid uint)) {
+	if gid, ok := readStackTag(); ok {
+		cb(gid)
+		return
+	}
+	gid := stackTagPool.Acquire()
+	defer stackTagPool.Release(gid)
+	addStackTag(gid, func() { cb(gid) })
+}