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// RUN: %target-run-simple-swift( -Xfrontend -sil-verify-all -Xfrontend -disable-availability-checking %import-libdispatch -parse-as-library)
// REQUIRES: executable_test
// REQUIRES: concurrency
// REQUIRES: freestanding
// rdar://76038845
// REQUIRES: concurrency_runtime
// UNSUPPORTED: back_deployment_runtime
@_spi(_TaskToThreadModel) import _Concurrency
import StdlibUnittest
import Darwin
@available(SwiftStdlib 5.1, *)
actor Counter {
private var value = 0
private let scratchBuffer: UnsafeMutableBufferPointer<Int>
init(maxCount: Int) {
scratchBuffer = .allocate(capacity: maxCount)
scratchBuffer.initialize(repeating: 0)
}
func next() -> Int {
let current = value
// Make sure we haven't produced this value before
assert(scratchBuffer[current] == 0)
scratchBuffer[current] = 1
value = value + 1
return current
}
deinit {
for i in 0..<value {
assert(scratchBuffer[i] == 1)
}
}
}
var counters: [Counter] = []
var iterations = 0
// Produce a random priority.
nonisolated var randomPriority: TaskPriority? {
let priorities: [TaskPriority?] = [ .background, .low, .medium, .high, nil ]
return priorities.randomElement()!
}
@available(SwiftStdlib 5.1, *)
func worker_async(workerIndex: Int) async {
for _ in 0..<iterations {
let counterIndex = Int.random(in: 0 ..< counters.count)
let counter = counters[counterIndex]
let nextValue = await counter.next()
print("Worker \(workerIndex) calling counter \(counterIndex) produced \(nextValue)")
}
}
func worker(context: UnsafeMutableRawPointer) -> UnsafeMutableRawPointer? {
Task.runInline {
await worker_async(workerIndex: Int(bitPattern: context))
return
}
return nil
}
@available(SwiftStdlib 5.1, *)
func runTest(numCounters: Int, numWorkers: Int) {
// Create counter actors.
for _ in 0..<numCounters {
counters.append(Counter(maxCount: numWorkers * iterations))
}
var workers: [pthread_t] = []
// Create a bunch of worker threads.
for workerIndex in 0..<numWorkers {
var thread : pthread_t? = nil
guard pthread_create(&thread, nil, worker, UnsafeMutableRawPointer(bitPattern: workerIndex)) == 0 else {
fatalError("pthread_create failed")
}
workers.append(thread!)
}
// Wait until all of the workers have finished.
for worker in workers {
guard pthread_join(worker, nil) == 0 else {
fatalError("pthread_join failed")
}
}
print("DONE!")
}
@available(SwiftStdlib 5.1, *)
@main struct Main {
static func main() {
let numCounters = 10
iterations = 1000
let workers = 100
print("counters: \(counters), workers: \(workers), iterations: \(iterations)")
runTest(numCounters: numCounters, numWorkers: workers)
}
}
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