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// Copyright (C) 2019-2023 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 condvar
import (
"sync"
"sync/atomic"
"time"
"github.com/algorand/go-algorand/util"
)
// TimedWait waits for sync.Cond c to be signaled, with a timeout.
// If the condition is not signaled before timeout, TimedWait forces
// a Broadcast() on c until this function returns. This assumes a
// (common) use of sync.Cond where stray signals are allowed, so
// the extra Broadcast() introduced by this function isn't a problem.
// This function does not indicate whether a timeout occurred or not;
// the caller should check time.Now() as needed.
func TimedWait(c *sync.Cond, timeout time.Duration) {
var done atomic.Bool
go func() {
util.NanoSleep(timeout)
for !done.Load() {
c.Broadcast()
// It is unlikely but possible that the parent
// thread hasn't gotten around to calling c.Wait()
// yet, so the c.Broadcast() did not wake it up.
// Sleep for a second and check again.
time.Sleep(time.Second)
}
}()
c.Wait()
done.Store(true)
}
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