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package stmutil
import (
"context"
"sync"
"github.com/anacrolix/stm"
)
var (
mu sync.Mutex
ctxVars = map[context.Context]*stm.Var{}
)
func ContextDoneVar(ctx context.Context) (*stm.Var, func()) {
mu.Lock()
defer mu.Unlock()
if v, ok := ctxVars[ctx]; ok {
return v, func() {}
}
if ctx.Err() != nil {
v := stm.NewVar(true)
ctxVars[ctx] = v
return v, func() {}
}
v := stm.NewVar(false)
go func() {
<-ctx.Done()
stm.AtomicSet(v, true)
}()
ctxVars[ctx] = v
return v, func() {}
}
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