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Copy pathcancellation_token_tests.cpp
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341 lines (282 loc) · 10.1 KB
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///////////////////////////////////////////////////////////////////////////////
// Copyright (c) Lewis Baker
// Licenced under MIT license. See LICENSE.txt for details.
///////////////////////////////////////////////////////////////////////////////
#include <cppcoro/cancellation_token.hpp>
#include <cppcoro/cancellation_source.hpp>
#include <cppcoro/cancellation_registration.hpp>
#include <cppcoro/operation_cancelled.hpp>
#include <thread>
#include "doctest/doctest.h"
TEST_SUITE_BEGIN("cancellation_token tests");
TEST_CASE("default cancellation_token is not cancellable")
{
cppcoro::cancellation_token t;
CHECK(!t.is_cancellation_requested());
CHECK(!t.can_be_cancelled());
}
TEST_CASE("calling request_cancellation on cancellation_source updates cancellation_token")
{
cppcoro::cancellation_source s;
cppcoro::cancellation_token t = s.token();
CHECK(t.can_be_cancelled());
CHECK(!t.is_cancellation_requested());
s.request_cancellation();
CHECK(t.is_cancellation_requested());
CHECK(t.can_be_cancelled());
}
TEST_CASE("cancellation_token can't be cancelled when last cancellation_source destructed")
{
cppcoro::cancellation_token t;
{
cppcoro::cancellation_source s;
t = s.token();
CHECK(t.can_be_cancelled());
}
CHECK(!t.can_be_cancelled());
}
TEST_CASE("cancelation_token can be cancelled when last cancellation_source destructed if cancellation already requested")
{
cppcoro::cancellation_token t;
{
cppcoro::cancellation_source s;
t = s.token();
CHECK(t.can_be_cancelled());
s.request_cancellation();
}
CHECK(t.can_be_cancelled());
CHECK(t.is_cancellation_requested());
}
TEST_CASE("cancellation_registration when cancellation not yet requested")
{
cppcoro::cancellation_source s;
bool callbackExecuted = false;
{
cppcoro::cancellation_registration callbackRegistration(
s.token(),
[&] { callbackExecuted = true; });
}
CHECK(!callbackExecuted);
{
cppcoro::cancellation_registration callbackRegistration(
s.token(),
[&] { callbackExecuted = true; });
CHECK(!callbackExecuted);
s.request_cancellation();
CHECK(callbackExecuted);
}
}
TEST_CASE("throw_if_cancellation_requested")
{
cppcoro::cancellation_source s;
cppcoro::cancellation_token t = s.token();
CHECK_NOTHROW(t.throw_if_cancellation_requested());
s.request_cancellation();
CHECK_THROWS_AS(t.throw_if_cancellation_requested(), const cppcoro::operation_cancelled&);
}
TEST_CASE("cancellation_registration called immediately when cancellation already requested")
{
cppcoro::cancellation_source s;
s.request_cancellation();
bool executed = false;
cppcoro::cancellation_registration r{ s.token(), [&] { executed = true; } };
CHECK(executed);
}
TEST_CASE("register many callbacks"
* doctest::description{
"this checks the code-path that allocates the next chunk of entries "
"in the internal data-structres, which occurs on 17th callback" })
{
cppcoro::cancellation_source s;
auto t = s.token();
int callbackExecutionCount = 0;
auto callback = [&] { ++callbackExecutionCount; };
// Allocate enough to require a second chunk to be allocated.
cppcoro::cancellation_registration r1{ t, callback };
cppcoro::cancellation_registration r2{ t, callback };
cppcoro::cancellation_registration r3{ t, callback };
cppcoro::cancellation_registration r4{ t, callback };
cppcoro::cancellation_registration r5{ t, callback };
cppcoro::cancellation_registration r6{ t, callback };
cppcoro::cancellation_registration r7{ t, callback };
cppcoro::cancellation_registration r8{ t, callback };
cppcoro::cancellation_registration r9{ t, callback };
cppcoro::cancellation_registration r10{ t, callback };
cppcoro::cancellation_registration r11{ t, callback };
cppcoro::cancellation_registration r12{ t, callback };
cppcoro::cancellation_registration r13{ t, callback };
cppcoro::cancellation_registration r14{ t, callback };
cppcoro::cancellation_registration r15{ t, callback };
cppcoro::cancellation_registration r16{ t, callback };
cppcoro::cancellation_registration r17{ t, callback };
cppcoro::cancellation_registration r18{ t, callback };
s.request_cancellation();
CHECK(callbackExecutionCount == 18);
}
TEST_CASE("concurrent registration and cancellation")
{
// Just check this runs and terminates without crashing.
for (int i = 0; i < 100; ++i)
{
cppcoro::cancellation_source source;
std::thread waiter1{ [token = source.token()]
{
std::atomic<bool> cancelled = false;
while (!cancelled)
{
cppcoro::cancellation_registration registration{ token, [&]
{
cancelled = true;
} };
cppcoro::cancellation_registration reg0{ token, [] {} };
cppcoro::cancellation_registration reg1{ token, [] {} };
cppcoro::cancellation_registration reg2{ token, [] {} };
cppcoro::cancellation_registration reg3{ token, [] {} };
cppcoro::cancellation_registration reg4{ token, [] {} };
cppcoro::cancellation_registration reg5{ token, [] {} };
cppcoro::cancellation_registration reg6{ token, [] {} };
cppcoro::cancellation_registration reg7{ token, [] {} };
cppcoro::cancellation_registration reg8{ token, [] {} };
cppcoro::cancellation_registration reg9{ token, [] {} };
cppcoro::cancellation_registration reg10{ token, [] {} };
cppcoro::cancellation_registration reg11{ token, [] {} };
cppcoro::cancellation_registration reg12{ token, [] {} };
cppcoro::cancellation_registration reg13{ token, [] {} };
cppcoro::cancellation_registration reg14{ token, [] {} };
cppcoro::cancellation_registration reg15{ token, [] {} };
cppcoro::cancellation_registration reg17{ token, [] {} };
std::this_thread::yield();
}
} };
std::thread waiter2{ [token = source.token()]
{
std::atomic<bool> cancelled = false;
while (!cancelled)
{
cppcoro::cancellation_registration registration{ token, [&]
{
cancelled = true;
} };
cppcoro::cancellation_registration reg0{ token, [] {} };
cppcoro::cancellation_registration reg1{ token, [] {} };
cppcoro::cancellation_registration reg2{ token, [] {} };
cppcoro::cancellation_registration reg3{ token, [] {} };
cppcoro::cancellation_registration reg4{ token, [] {} };
cppcoro::cancellation_registration reg5{ token, [] {} };
cppcoro::cancellation_registration reg6{ token, [] {} };
cppcoro::cancellation_registration reg7{ token, [] {} };
cppcoro::cancellation_registration reg8{ token, [] {} };
cppcoro::cancellation_registration reg9{ token, [] {} };
cppcoro::cancellation_registration reg10{ token, [] {} };
cppcoro::cancellation_registration reg11{ token, [] {} };
cppcoro::cancellation_registration reg12{ token, [] {} };
cppcoro::cancellation_registration reg13{ token, [] {} };
cppcoro::cancellation_registration reg14{ token, [] {} };
cppcoro::cancellation_registration reg15{ token, [] {} };
cppcoro::cancellation_registration reg16{ token, [] {} };
std::this_thread::yield();
}
} };
std::thread waiter3{ [token = source.token()]
{
std::atomic<bool> cancelled = false;
while (!cancelled)
{
cppcoro::cancellation_registration registration{ token, [&]
{
cancelled = true;
} };
cppcoro::cancellation_registration reg0{ token, [] {} };
cppcoro::cancellation_registration reg1{ token, [] {} };
cppcoro::cancellation_registration reg2{ token, [] {} };
cppcoro::cancellation_registration reg3{ token, [] {} };
cppcoro::cancellation_registration reg4{ token, [] {} };
cppcoro::cancellation_registration reg5{ token, [] {} };
cppcoro::cancellation_registration reg6{ token, [] {} };
cppcoro::cancellation_registration reg7{ token, [] {} };
cppcoro::cancellation_registration reg8{ token, [] {} };
cppcoro::cancellation_registration reg9{ token, [] {} };
cppcoro::cancellation_registration reg10{ token, [] {} };
cppcoro::cancellation_registration reg11{ token, [] {} };
cppcoro::cancellation_registration reg12{ token, [] {} };
cppcoro::cancellation_registration reg13{ token, [] {} };
cppcoro::cancellation_registration reg14{ token, [] {} };
cppcoro::cancellation_registration reg15{ token, [] {} };
cppcoro::cancellation_registration reg16{ token, [] {} };
std::this_thread::yield();
}
} };
std::thread canceller{ [&source]
{
source.request_cancellation();
} };
canceller.join();
waiter1.join();
waiter2.join();
waiter3.join();
}
}
TEST_CASE("cancellation registration single-threaded performance")
{
struct batch
{
batch(cppcoro::cancellation_token t)
: r0(t, [] {})
, r1(t, [] {})
, r2(t, [] {})
, r3(t, [] {})
, r4(t, [] {})
, r5(t, [] {})
, r6(t, [] {})
, r7(t, [] {})
, r8(t, [] {})
, r9(t, [] {})
{}
cppcoro::cancellation_registration r0;
cppcoro::cancellation_registration r1;
cppcoro::cancellation_registration r2;
cppcoro::cancellation_registration r3;
cppcoro::cancellation_registration r4;
cppcoro::cancellation_registration r5;
cppcoro::cancellation_registration r6;
cppcoro::cancellation_registration r7;
cppcoro::cancellation_registration r8;
cppcoro::cancellation_registration r9;
};
cppcoro::cancellation_source s;
constexpr int iterationCount = 100'000;
auto start = std::chrono::high_resolution_clock::now();
for (int i = 0; i < iterationCount; ++i)
{
cppcoro::cancellation_registration r{ s.token(), [] {} };
}
auto end = std::chrono::high_resolution_clock::now();
auto time1 = end - start;
start = end;
for (int i = 0; i < iterationCount; ++i)
{
batch b{ s.token() };
}
end = std::chrono::high_resolution_clock::now();
auto time2 = end - start;
start = end;
for (int i = 0; i < iterationCount; ++i)
{
batch b0{ s.token() };
batch b1{ s.token() };
batch b2{ s.token() };
batch b3{ s.token() };
batch b4{ s.token() };
}
end = std::chrono::high_resolution_clock::now();
auto time3 = end - start;
auto report = [](const char* label, auto time, std::uint64_t count)
{
auto us = std::chrono::duration_cast<std::chrono::microseconds>(time).count();
MESSAGE(label << " took " << us << "us (" << (1000.0 * us / count) << " ns/item)");
};
report("Individual", time1, iterationCount);
report("Batch10", time2, 10 * iterationCount);
report("Batch50", time3, 50 * iterationCount);
}
TEST_SUITE_END();
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