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Do not wait for cancellation signal (#4664)

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* Do not wait for cancelation signal

* Test

* Explicit constructor
This commit is contained in:
Piotr Wójcik 2024-07-02 09:48:12 +02:00 • committed by GitHub
commit 6a802b2359
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GPG key ID: B5690EEEBB952194
2 changed files with 29 additions and 11 deletions
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22
nano/core_test/async.cpp
View file

@ -56,10 +56,30 @@ TEST (async, cancellation)
cancellation.emit ();
ASSERT_EQ (fut.wait_for (500ms), std::future_status::ready);
ASSERT_EQ (fut.wait_for (1s), std::future_status::ready);
ASSERT_NO_THROW (fut.get ());
}
// Test that cancellation signal behaves well when the cancellation is emitted after the task has completed
TEST (async, cancellation_lifetime)
{
test_context ctx;
nano::async::cancellation cancellation{ ctx.strand };
{
auto fut = asio::co_spawn (
ctx.strand,
[&] () -> asio::awaitable<void> {
co_await nano::async::sleep_for (100ms);
},
asio::bind_cancellation_slot (cancellation.slot (), asio::use_future));
ASSERT_EQ (fut.wait_for (1s), std::future_status::ready);
fut.get ();
}
auto cancel_fut = cancellation.emit ();
ASSERT_EQ (cancel_fut.wait_for (1s), std::future_status::ready);
}
TEST (async, task)
{
nano::test::system system;

18
nano/lib/async.hpp
View file

@ -30,7 +30,7 @@ class cancellation
public:
explicit cancellation (nano::async::strand & strand) :
strand{ strand },
signal{ std::make_unique<asio::cancellation_signal> () }
signal{ std::make_shared<asio::cancellation_signal> () }
{
}
@ -49,12 +49,11 @@ public:
};
public:
void emit (asio::cancellation_type type = asio::cancellation_type::all)
auto emit (asio::cancellation_type type = asio::cancellation_type::all)
{
asio::dispatch (strand, asio::use_future ([this, type] () {
signal->emit (type);
}))
.wait ();
return asio::dispatch (strand, asio::use_future ([signal_l = signal, type] () {
signal_l->emit (type);
}));
}
auto slot ()
@ -67,9 +66,8 @@ public:
nano::async::strand & strand;
private:
std::unique_ptr<asio::cancellation_signal> signal; // Wrap the signal in a unique_ptr to enable moving
bool slotted{ false };
std::shared_ptr<asio::cancellation_signal> signal;
bool slotted{ false }; // For debugging purposes
};
/**
@ -82,7 +80,7 @@ public:
// Only thread-like void tasks are supported for now
using value_type = void;
task (nano::async::strand & strand) :
explicit task (nano::async::strand & strand) :
strand{ strand },
cancellation{ strand }
{