| /* |
| * Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. |
| */ |
| |
| package kotlinx.coroutines.sync |
| |
| import kotlinx.atomicfu.* |
| import kotlinx.coroutines.* |
| import kotlin.test.* |
| |
| class MutexTest : TestBase() { |
| @Test |
| fun testSimple() = runTest { |
| val mutex = Mutex() |
| expect(1) |
| launch { |
| expect(4) |
| mutex.lock() // suspends |
| expect(7) // now got lock |
| mutex.unlock() |
| expect(8) |
| } |
| expect(2) |
| mutex.lock() // locked |
| expect(3) |
| yield() // yield to child |
| expect(5) |
| mutex.unlock() |
| expect(6) |
| yield() // now child has lock |
| finish(9) |
| } |
| |
| @Test |
| fun tryLockTest() { |
| val mutex = Mutex() |
| assertFalse(mutex.isLocked) |
| assertTrue(mutex.tryLock()) |
| assertTrue(mutex.isLocked) |
| assertFalse(mutex.tryLock()) |
| assertTrue(mutex.isLocked) |
| mutex.unlock() |
| assertFalse(mutex.isLocked) |
| assertTrue(mutex.tryLock()) |
| assertTrue(mutex.isLocked) |
| assertFalse(mutex.tryLock()) |
| assertTrue(mutex.isLocked) |
| mutex.unlock() |
| assertFalse(mutex.isLocked) |
| } |
| |
| @Test |
| fun withLockTest() = runTest { |
| val mutex = Mutex() |
| assertFalse(mutex.isLocked) |
| mutex.withLock { |
| assertTrue(mutex.isLocked) |
| } |
| assertFalse(mutex.isLocked) |
| } |
| |
| @Test |
| fun testUnconfinedStackOverflow() { |
| val waiters = 10000 |
| val mutex = Mutex(true) |
| var done = 0 |
| repeat(waiters) { |
| GlobalScope.launch(Dispatchers.Unconfined) { // a lot of unconfined waiters |
| mutex.withLock { |
| done++ |
| } |
| } |
| } |
| mutex.unlock() // should not produce StackOverflowError |
| assertEquals(waiters, done) |
| } |
| |
| @Test |
| fun holdLock() = runTest { |
| val mutex = Mutex() |
| val firstOwner = Any() |
| val secondOwner = Any() |
| |
| // no lock |
| assertFalse(mutex.holdsLock(firstOwner)) |
| assertFalse(mutex.holdsLock(secondOwner)) |
| |
| // owner firstOwner |
| mutex.lock(firstOwner) |
| val secondLockJob = launch { |
| mutex.lock(secondOwner) |
| } |
| |
| assertTrue(mutex.holdsLock(firstOwner)) |
| assertFalse(mutex.holdsLock(secondOwner)) |
| |
| // owner secondOwner |
| mutex.unlock(firstOwner) |
| secondLockJob.join() |
| |
| assertFalse(mutex.holdsLock(firstOwner)) |
| assertTrue(mutex.holdsLock(secondOwner)) |
| |
| mutex.unlock(secondOwner) |
| |
| // no lock |
| assertFalse(mutex.holdsLock(firstOwner)) |
| assertFalse(mutex.holdsLock(secondOwner)) |
| } |
| } |