/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*/
#include <gtest/gtest.h>
-#include <thread>
#include <folly/futures/Future.h>
#include <folly/futures/InlineExecutor.h>
#include <folly/futures/ManualExecutor.h>
#include <folly/futures/DrivableExecutor.h>
+#include <folly/Baton.h>
+#include <folly/MPMCQueue.h>
+
+#include <thread>
using namespace folly;
struct ManualWaiter : public DrivableExecutor {
explicit ManualWaiter(std::shared_ptr<ManualExecutor> ex) : ex(ex) {}
- void add(Func f) {
+ void add(Func f) override {
ex->add(f);
}
done(false)
{
t = std::thread([=] {
- ManualWaiter eastWaiter(eastExecutor);
- while (!done)
- eastWaiter.drive();
+ ManualWaiter eastWaiter(eastExecutor);
+ while (!done)
+ eastWaiter.drive();
});
}
std::thread t;
};
-TEST(Via, exception_on_launch) {
+TEST(Via, exceptionOnLaunch) {
auto future = makeFuture<int>(std::runtime_error("E"));
EXPECT_THROW(future.value(), std::runtime_error);
}
-TEST(Via, then_value) {
+TEST(Via, thenValue) {
auto future = makeFuture(std::move(1))
.then([](Try<int>&& t) {
return t.value() == 1;
EXPECT_TRUE(future.value());
}
-TEST(Via, then_future) {
+TEST(Via, thenFuture) {
auto future = makeFuture(1)
.then([](Try<int>&& t) {
return makeFuture(t.value() == 1);
- })
- ;
+ });
EXPECT_TRUE(future.value());
}
return makeFuture(t.value() + ";static");
}
-TEST(Via, then_function) {
+TEST(Via, thenFunction) {
struct Worker {
Future<std::string> doWork(Try<std::string>&& t) {
return makeFuture(t.value() + ";class");
auto f = makeFuture(std::string("start"))
.then(doWorkStatic)
.then(Worker::doWorkStatic)
- .then(&w, &Worker::doWork)
+ .then(&Worker::doWork, &w)
;
EXPECT_EQ(f.value(), "start;static;class-static;class");
}
-TEST_F(ViaFixture, deactivateChain) {
- bool flag = false;
- auto f = makeFuture().deactivate();
- EXPECT_FALSE(f.isActive());
- auto f2 = f.then([&](Try<void>){ flag = true; });
- EXPECT_FALSE(flag);
-}
-
-TEST_F(ViaFixture, deactivateActivateChain) {
- bool flag = false;
- // you can do this all day long with temporaries.
- auto f1 = makeFuture().deactivate().activate().deactivate();
- // Chaining on activate/deactivate requires an rvalue, so you have to move
- // one of these two ways (if you're not using a temporary).
- auto f2 = std::move(f1).activate();
- f2.deactivate();
- auto f3 = std::move(f2.activate());
- f3.then([&](Try<void>){ flag = true; });
- EXPECT_TRUE(flag);
-}
-
-TEST_F(ViaFixture, thread_hops) {
+TEST_F(ViaFixture, threadHops) {
auto westThreadId = std::this_thread::get_id();
auto f = via(eastExecutor.get()).then([=](Try<void>&& t) {
EXPECT_NE(std::this_thread::get_id(), westThreadId);
EXPECT_EQ(f.getVia(waiter.get()), 1);
}
-TEST_F(ViaFixture, chain_vias) {
+TEST_F(ViaFixture, chainVias) {
auto westThreadId = std::this_thread::get_id();
- auto f = via(eastExecutor.get()).then([=](Try<void>&& t) {
+ auto f = via(eastExecutor.get()).then([=]() {
EXPECT_NE(std::this_thread::get_id(), westThreadId);
- return makeFuture<int>(1);
- }).then([=](Try<int>&& t) {
- int val = t.value();
- return makeFuture(std::move(val)).via(westExecutor.get())
- .then([=](Try<int>&& t) mutable {
+ return 1;
+ }).then([=](int val) {
+ return makeFuture(val).via(westExecutor.get())
+ .then([=](int val) mutable {
EXPECT_EQ(std::this_thread::get_id(), westThreadId);
- return t.value();
+ return val + 1;
});
- }).then([=](Try<int>&& t) {
+ }).then([=](int val) {
+ // even though ultimately the future that triggers this one executed in
+ // the west thread, this then() inherited the executor from its
+ // predecessor, ie the eastExecutor.
+ EXPECT_NE(std::this_thread::get_id(), westThreadId);
+ return val + 1;
+ }).via(westExecutor.get()).then([=](int val) {
+ // go back to west, so we can wait on it
EXPECT_EQ(std::this_thread::get_id(), westThreadId);
- return t.value();
+ return val + 1;
});
- EXPECT_EQ(f.getVia(waiter.get()), 1);
+ EXPECT_EQ(f.getVia(waiter.get()), 4);
}
TEST_F(ViaFixture, bareViaAssignment) {
TEST(Via, chain1) {
EXPECT_EQ(42,
makeFuture()
- .then(futures::chain<void, int>([] { return 42; }))
+ .thenMulti([] { return 42; })
.get());
}
TEST(Via, chain3) {
int count = 0;
- auto f = makeFuture().then(futures::chain<void, int>(
+ auto f = makeFuture().thenMulti(
[&]{ count++; return 3.14159; },
[&](double) { count++; return std::string("hello"); },
- [&]{ count++; return makeFuture(42); }));
+ [&]{ count++; return makeFuture(42); });
EXPECT_EQ(42, f.get());
EXPECT_EQ(3, count);
}
+
+struct PriorityExecutor : public Executor {
+ void add(Func f) override {}
+
+ void addWithPriority(Func, int8_t priority) override {
+ int mid = getNumPriorities() / 2;
+ int p = priority < 0 ?
+ std::max(0, mid + priority) :
+ std::min(getNumPriorities() - 1, mid + priority);
+ EXPECT_LT(p, 3);
+ EXPECT_GE(p, 0);
+ if (p == 0) {
+ count0++;
+ } else if (p == 1) {
+ count1++;
+ } else if (p == 2) {
+ count2++;
+ }
+ }
+
+ uint8_t getNumPriorities() const override {
+ return 3;
+ }
+
+ int count0{0};
+ int count1{0};
+ int count2{0};
+};
+
+TEST(Via, priority) {
+ PriorityExecutor exe;
+ via(&exe, -1).then([]{});
+ via(&exe, 0).then([]{});
+ via(&exe, 1).then([]{});
+ via(&exe, 42).then([]{}); // overflow should go to max priority
+ via(&exe, -42).then([]{}); // underflow should go to min priority
+ via(&exe).then([]{}); // default to mid priority
+ via(&exe, Executor::LO_PRI).then([]{});
+ via(&exe, Executor::HI_PRI).then([]{});
+ EXPECT_EQ(3, exe.count0);
+ EXPECT_EQ(2, exe.count1);
+ EXPECT_EQ(3, exe.count2);
+}
+
+TEST_F(ViaFixture, chainX1) {
+ EXPECT_EQ(42,
+ makeFuture()
+ .thenMultiWithExecutor(eastExecutor.get(),[] { return 42; })
+ .get());
+}
+
+TEST_F(ViaFixture, chainX3) {
+ auto westThreadId = std::this_thread::get_id();
+ int count = 0;
+ auto f = via(westExecutor.get()).thenMultiWithExecutor(
+ eastExecutor.get(),
+ [&]{
+ EXPECT_NE(std::this_thread::get_id(), westThreadId);
+ count++; return 3.14159;
+ },
+ [&](double) { count++; return std::string("hello"); },
+ [&]{ count++; })
+ .then([&](){
+ EXPECT_EQ(std::this_thread::get_id(), westThreadId);
+ return makeFuture(42);
+ });
+ EXPECT_EQ(42, f.getVia(waiter.get()));
+ EXPECT_EQ(3, count);
+}
+
+TEST(Via, then2) {
+ ManualExecutor x1, x2;
+ bool a = false, b = false, c = false;
+ via(&x1)
+ .then([&]{ a = true; })
+ .then(&x2, [&]{ b = true; })
+ .then([&]{ c = true; });
+
+ EXPECT_FALSE(a);
+ EXPECT_FALSE(b);
+
+ x1.run();
+ EXPECT_TRUE(a);
+ EXPECT_FALSE(b);
+ EXPECT_FALSE(c);
+
+ x2.run();
+ EXPECT_TRUE(b);
+ EXPECT_FALSE(c);
+
+ x1.run();
+ EXPECT_TRUE(c);
+}
+
+TEST(Via, then2Variadic) {
+ struct Foo { bool a = false; void foo(Try<void>) { a = true; } };
+ Foo f;
+ ManualExecutor x;
+ makeFuture().then(&x, &Foo::foo, &f);
+ EXPECT_FALSE(f.a);
+ x.run();
+ EXPECT_TRUE(f.a);
+}
+
+/// Simple executor that does work in another thread
+class ThreadExecutor : public Executor {
+ folly::MPMCQueue<Func> funcs;
+ std::atomic<bool> done {false};
+ std::thread worker;
+ folly::Baton<> baton;
+
+ void work() {
+ baton.post();
+ Func fn;
+ while (!done) {
+ while (!funcs.isEmpty()) {
+ funcs.blockingRead(fn);
+ fn();
+ }
+ }
+ }
+
+ public:
+ explicit ThreadExecutor(size_t n = 1024)
+ : funcs(n) {
+ worker = std::thread(std::bind(&ThreadExecutor::work, this));
+ }
+
+ ~ThreadExecutor() {
+ done = true;
+ funcs.write([]{});
+ worker.join();
+ }
+
+ void add(Func fn) override {
+ funcs.blockingWrite(std::move(fn));
+ }
+
+ void waitForStartup() {
+ baton.wait();
+ }
+};
+
+TEST(Via, viaThenGetWasRacy) {
+ ThreadExecutor x;
+ std::unique_ptr<int> val = folly::via(&x)
+ .then([] { return folly::make_unique<int>(42); })
+ .get();
+ ASSERT_TRUE(!!val);
+ EXPECT_EQ(42, *val);
+}
+
+class DummyDrivableExecutor : public DrivableExecutor {
+ public:
+ void add(Func f) override {}
+ void drive() override { ran = true; }
+ bool ran{false};
+};
+
+TEST(Via, getVia) {
+ {
+ // non-void
+ ManualExecutor x;
+ auto f = via(&x).then([]{ return true; });
+ EXPECT_TRUE(f.getVia(&x));
+ }
+
+ {
+ // void
+ ManualExecutor x;
+ auto f = via(&x).then();
+ f.getVia(&x);
+ }
+
+ {
+ DummyDrivableExecutor x;
+ auto f = makeFuture(true);
+ EXPECT_TRUE(f.getVia(&x));
+ EXPECT_FALSE(x.ran);
+ }
+}
+
+TEST(Via, waitVia) {
+ {
+ ManualExecutor x;
+ auto f = via(&x).then();
+ EXPECT_FALSE(f.isReady());
+ f.waitVia(&x);
+ EXPECT_TRUE(f.isReady());
+ }
+
+ {
+ // try rvalue as well
+ ManualExecutor x;
+ auto f = via(&x).then().waitVia(&x);
+ EXPECT_TRUE(f.isReady());
+ }
+
+ {
+ DummyDrivableExecutor x;
+ makeFuture(true).waitVia(&x);
+ EXPECT_FALSE(x.ran);
+ }
+}
+
+TEST(Via, viaRaces) {
+ ManualExecutor x;
+ Promise<void> p;
+ auto tid = std::this_thread::get_id();
+ bool done = false;
+
+ std::thread t1([&] {
+ p.getFuture()
+ .via(&x)
+ .then([&](Try<void>&&) { EXPECT_EQ(tid, std::this_thread::get_id()); })
+ .then([&](Try<void>&&) { EXPECT_EQ(tid, std::this_thread::get_id()); })
+ .then([&](Try<void>&&) { done = true; });
+ });
+
+ std::thread t2([&] {
+ p.setValue();
+ });
+
+ while (!done) x.run();
+ t1.join();
+ t2.join();
+}
projects / folly.git / blobdiff