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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2021 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import NIOCore
import NIOPosix
import Dispatch
import NIOConcurrencyHelpers
final class NIOLockBenchmark: Benchmark {
private let numberOfThreads: Int
private let lockOperationsPerThread: Int
private let threadPool: NIOThreadPool
private let group: EventLoopGroup
private let sem1 = DispatchSemaphore(value: 0)
private let sem2 = DispatchSemaphore(value: 0)
private let sem3 = DispatchSemaphore(value: 0)
private var opsDone = 0
private let lock = NIOLock()
init(numberOfThreads: Int, lockOperationsPerThread: Int) {
self.numberOfThreads = numberOfThreads
self.lockOperationsPerThread = lockOperationsPerThread
self.threadPool = NIOThreadPool(numberOfThreads: numberOfThreads)
self.group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
}
func setUp() throws {
self.threadPool.start()
}
func tearDown() {
try! self.threadPool.syncShutdownGracefully()
try! self.group.syncShutdownGracefully()
}
func run() throws -> Int {
self.lock.withLock {
self.opsDone = 0
}
for _ in 0..<self.numberOfThreads {
_ = self.threadPool.runIfActive(eventLoop: self.group.next()) {
self.sem1.signal()
self.sem2.wait()
for _ in 0 ..< self.lockOperationsPerThread {
self.lock.withLock {
self.opsDone &+= 1
}
}
self.sem3.signal()
}
}
// Wait until all threads are ready.
for _ in 0..<self.numberOfThreads {
self.sem1.wait()
}
// Kick off the work.
for _ in 0..<self.numberOfThreads {
self.sem2.signal()
}
// Wait until all threads are done.
for _ in 0..<self.numberOfThreads {
self.sem3.wait()
}
let done = self.lock.withLock { self.opsDone }
precondition(done == self.numberOfThreads * self.lockOperationsPerThread)
return done
}
}
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