v/vlib/sync/waitgroup.v

32 lines
524 B
V
Raw Normal View History

2019-07-30 15:06:16 +02:00
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module sync
pub struct WaitGroup {
2019-07-30 15:06:16 +02:00
mut:
mu Mutex
active int
2019-07-30 15:06:16 +02:00
}
pub fn (wg mut WaitGroup) add(delta int) {
wg.mu.lock()
wg.active += delta
wg.mu.unlock()
if wg.active < 0 {
panic('Negative number of jobs in waitgroup')
}
2019-07-30 15:06:16 +02:00
}
pub fn (wg mut WaitGroup) done() {
wg.add(-1)
2019-07-30 15:06:16 +02:00
}
pub fn (wg mut WaitGroup) wait() {
for wg.active > 0 {
// waiting
}
2019-07-30 15:06:16 +02:00
}