ceremonyclient/go-libp2p/p2p/net/upgrader/threshold.go
2023-08-20 23:07:43 -05:00

51 lines
749 B
Go

package upgrader
import (
"sync"
)
func newThreshold(cutoff int) *threshold {
t := &threshold{
threshold: cutoff,
}
t.cond.L = &t.mu
return t
}
type threshold struct {
mu sync.Mutex
cond sync.Cond
count int
threshold int
}
// Acquire increments the counter. It will not block.
func (t *threshold) Acquire() {
t.mu.Lock()
t.count++
t.mu.Unlock()
}
// Release decrements the counter.
func (t *threshold) Release() {
t.mu.Lock()
if t.count == 0 {
panic("negative count")
}
if t.threshold == t.count {
t.cond.Broadcast()
}
t.count--
t.mu.Unlock()
}
// Wait waits for the counter to drop below the threshold
func (t *threshold) Wait() {
t.mu.Lock()
for t.count >= t.threshold {
t.cond.Wait()
}
t.mu.Unlock()
}