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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package util
import (
"time"
)
// NanoAfter waits for the duration to elapse and then sends the current time on the returned channel.
func NanoAfter(d time.Duration) <-chan time.Time {
// The following is a workaround for the go 1.16 bug, where timers are rounded up to the next millisecond resolution.
// Go implementation for "time.After" avoids creating the go-routine until it's needed for writing the time
// to the channel. This is a pretty impressive implementation compared to the one below, since it's much more
// resource-efficient. For that reason, we'll keep calling the efficient implementation when timing is not
// critical ( i.e. > 10ms ).
if d > 10*time.Millisecond {
return time.After(d)
}
c := make(chan time.Time, 1)
go func() {
NanoSleep(d)
c <- time.Now()
}()
return c
}
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