taskflow/unittests/test_semaphores.cpp at master · taskflow/taskflow · GitHub

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#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN

#include <doctest.h>

#include <taskflow/taskflow.hpp>

// --------------------------------------------------------

// Testcase: CriticalSection

// --------------------------------------------------------

void critical_section(size_t W) {

tf::Taskflow taskflow;

tf::Executor executor(W);

tf::Semaphore sema(1);

REQUIRE(sema.value() == 1);

REQUIRE(sema.max_value() == 1);

int N = 1000;

int counter = 0;

for(int i=0; i<N; ++i) {

taskflow.emplace([&](){ counter++; })

.name(std::to_string(i))

.acquire(sema)

.release(sema);

}

executor.run(taskflow).wait();

REQUIRE(counter == N);

executor.run(taskflow);

executor.wait_for_all();

REQUIRE(counter == 4*N);

REQUIRE(sema.value() == 1);

REQUIRE(sema.max_value() == 1);

}

TEST_CASE("Semaphore.CriticalSection.1thread" * doctest::timeout(300)) {

critical_section(1);

}

TEST_CASE("Semaphore.CriticalSection.2threads" * doctest::timeout(300)) {

critical_section(2);

}

TEST_CASE("Semaphore.CriticalSection.3threads" * doctest::timeout(300)) {

critical_section(3);

}

TEST_CASE("Semaphore.CriticalSection.7threads" * doctest::timeout(300)) {

critical_section(7);

}

TEST_CASE("Semaphore.CriticalSection.11threads" * doctest::timeout(300)) {

critical_section(11);

}

TEST_CASE("Semaphore.CriticalSection.16threads" * doctest::timeout(300)) {

critical_section(16);

}

// --------------------------------------------------------

// Testcase: OverlappedSemaphore

// --------------------------------------------------------

void overlapped_semaphores(size_t W) {

tf::Executor executor(W);

tf::Taskflow taskflow;

tf::Semaphore semaphore1(1);

tf::Semaphore semaphore4(4);

int N = 1000;

int counter = 0;

for(int i=0; i<N; i++) {

auto task = taskflow.emplace([&](){ counter++; });

task.acquire(semaphore1);

task.acquire(semaphore4);

task.release(semaphore1);

task.release(semaphore4);

}

executor.run(taskflow).wait();

REQUIRE(counter == N);

REQUIRE(semaphore1.value() == 1);

REQUIRE(semaphore4.value() == 4);

}

TEST_CASE("Semaphore.Overlap.1thread" * doctest::timeout(300)) {

overlapped_semaphores(1);

}

TEST_CASE("Semaphore.Overlap.2threads" * doctest::timeout(300)) {

overlapped_semaphores(2);

}

TEST_CASE("Semaphore.Overlap.4threads" * doctest::timeout(300)) {

overlapped_semaphores(4);

}

TEST_CASE("Semaphore.Overlap.8threads" * doctest::timeout(300)) {

overlapped_semaphores(8);

}

// --------------------------------------------------------

// Testcase: Conflict Graph

// --------------------------------------------------------

void conflict_graph(size_t W) {

tf::Executor executor(W);

tf::Taskflow taskflow;

tf::Semaphore conflict_AB(1);

tf::Semaphore conflict_AC(1);

int counter {0};

std::mutex mutex;

tf::Task A = taskflow.emplace([&](){ counter++; });

// B and C can run together

tf::Task B = taskflow.emplace([&](){

std::lock_guard<std::mutex> lock(mutex);

counter++;

});

tf::Task C = taskflow.emplace([&](){

std::lock_guard<std::mutex> lock(mutex);

counter++;

});

// describe the conflict between A and B

A.acquire(conflict_AB).release(conflict_AB);

B.acquire(conflict_AB).release(conflict_AB);

// describe the conflict between A and C

A.acquire(conflict_AC).release(conflict_AC);

C.acquire(conflict_AC).release(conflict_AC);

executor.run(taskflow).wait();

REQUIRE(counter == 3);

for(size_t i=0; i<10; i++) {

executor.run_n(taskflow, 10);

}

executor.wait_for_all();

REQUIRE(counter == 303);

}

TEST_CASE("Semaphore.ConflictGraph.1thread" * doctest::timeout(300)) {

conflict_graph(1);

}

TEST_CASE("Semaphore.ConflictGraph.2threads" * doctest::timeout(300)) {

conflict_graph(2);

}

TEST_CASE("Semaphore.ConflictGraph.3threads" * doctest::timeout(300)) {

conflict_graph(3);

}

TEST_CASE("Semaphore.ConflictGraph.4threads" * doctest::timeout(300)) {

conflict_graph(4);

}

// ----------------------------------------------------------------------------

// Module Task

// ----------------------------------------------------------------------------

void semaphore_in_module(unsigned W) {

tf::Taskflow taskflow1;

tf::Taskflow taskflow2;

tf::Executor executor(W);

tf::Semaphore semaphore(2);

size_t N = 1024;

size_t counter {0};

for(size_t i=0; i<N; i=i+1){

auto t = taskflow1.emplace([&](){ counter++; });

t.acquire(semaphore);

t.release(semaphore);

}

auto m = taskflow2.composed_of(taskflow1);

m.acquire(semaphore);

m.release(semaphore);

executor.run(taskflow2).get();

REQUIRE(counter == N);

}

TEST_CASE("Semaphore.Module.1thread" * doctest::timeout(300)) {

semaphore_in_module(1);

}

TEST_CASE("Semaphore.Module.2threads" * doctest::timeout(300)) {

semaphore_in_module(2);

}

TEST_CASE("Semaphore.Module.3threads" * doctest::timeout(300)) {

semaphore_in_module(3);

}

TEST_CASE("Semaphore.Module.4threads" * doctest::timeout(300)) {

semaphore_in_module(4);

}

// ----------------------------------------------------------------------------

// Semahpores in Module Task

// ----------------------------------------------------------------------------

void semaphores_in_module(unsigned W) {

tf::Taskflow taskflow1;

tf::Taskflow taskflow2;

tf::Executor executor(W);

std::vector<tf::Semaphore> semaphores(10);

for(auto& sema : semaphores) {

REQUIRE(sema.value() == 0);

REQUIRE(sema.max_value() == 0);

sema.reset(2);

REQUIRE(sema.value() == 2);

REQUIRE(sema.max_value() == 2);

}

size_t N = 1024;

size_t counter {0};

for(size_t i=0; i<N; i=i+1){

auto t = taskflow1.emplace([&](){ counter++; });

t.acquire(semaphores.begin(), semaphores.end());

t.release(semaphores.begin(), semaphores.end());

}

auto m = taskflow2.composed_of(taskflow1);

m.acquire(semaphores.begin(), semaphores.end());

m.release(semaphores.begin(), semaphores.end());

executor.run(taskflow2).get();

REQUIRE(counter == N);

}

TEST_CASE("Semaphores.Module.1thread" * doctest::timeout(300)) {

semaphores_in_module(1);

}

TEST_CASE("Semaphores.Module.2threads" * doctest::timeout(300)) {

semaphores_in_module(2);

}

TEST_CASE("Semaphores.Module.3threads" * doctest::timeout(300)) {

semaphores_in_module(3);

}

TEST_CASE("Semaphores.Module.4threads" * doctest::timeout(300)) {

semaphores_in_module(4);

}

TEST_CASE("Semaphores.Module.5threads" * doctest::timeout(300)) {

semaphores_in_module(5);

}

TEST_CASE("Semaphores.Module.6threads" * doctest::timeout(300)) {

semaphores_in_module(6);

}

TEST_CASE("Semaphores.Module.7threads" * doctest::timeout(300)) {

semaphores_in_module(7);

}

TEST_CASE("Semaphores.Module.8threads" * doctest::timeout(300)) {

semaphores_in_module(8);

}

// ----------------------------------------------------------------------------

// Linear Chain

// ----------------------------------------------------------------------------

void linear_chain(unsigned W) {

const size_t L = 10000;

std::vector<tf::CachelineAligned<size_t>> counters(L);

std::vector<tf::Semaphore> semaphores(L);

for(auto& semaphore : semaphores) {

semaphore.reset(1);

}

tf::Executor executor(W);

tf::Taskflow taskflow;

for(size_t i=0; i<L; i++) {

auto t = taskflow.emplace([i, &counters](){

if(i) {

counters[i-1].data++;

}

counters[i].data++;

});

if(i) {

t.acquire(semaphores[i-1])

.release(semaphores[i-1]);

}

t.acquire(semaphores[i])

.release(semaphores[i]);

}

executor.run(taskflow).get();

counters.back().data++;

for(auto& c : counters) {

REQUIRE(c.data == 2);

}

TEST_CASE("Semaphore.LinearChain.1thread" * doctest::timeout(300)) {

linear_chain(1);

}

TEST_CASE("Semaphore.LinearChain.2threads" * doctest::timeout(300)) {

linear_chain(2);

}

TEST_CASE("Semaphore.LinearChain.3threads" * doctest::timeout(300)) {

linear_chain(3);

}

TEST_CASE("Semaphore.LinearChain.4threads" * doctest::timeout(300)) {

linear_chain(4);

}

TEST_CASE("Semaphore.LinearChain.5threads" * doctest::timeout(300)) {

linear_chain(5);

}

TEST_CASE("Semaphore.LinearChain.6threads" * doctest::timeout(300)) {

linear_chain(6);

}

TEST_CASE("Semaphore.LinearChain.7threads" * doctest::timeout(300)) {

linear_chain(7);

}

TEST_CASE("Semaphore.LinearChain.8threads" * doctest::timeout(300)) {

linear_chain(8);

}

// ----------------------------------------------------------------------------

void deadlock(unsigned W) {

tf::Executor exec(W);

tf::Taskflow flow;

tf::Semaphore semaphore(8);

for(size_t i = 0; i < 5; ++i) {

tf::Task commonTask = flow.emplace([i]() {

std::string str;

str.append("Common task for i = ").append(std::to_string(i)).append("\n");

std::cout << str;

}).name(std::string("Common i = ").append(std::to_string(i)));

for(size_t j = 0; j < 8; ++j) {

tf::Task preTask = flow.emplace([i, j]() {

std::string str;

str.append("Pre task for i = ").append(std::to_string(i)).append(", j = ").append(std::to_string(j)).append("\n");

std::cout << str;

}).name(std::string("Pre task i = ").append(std::to_string(i)).append(", j = ").append(std::to_string(j)));

tf::Task postTask = flow.emplace([i, j]() {

std::string str;

str.append("Post task for i = ").append(std::to_string(i)).append(", j = ").append(std::to_string(j)).append("\n");

std::cout << str;

}).name(std::string("Post task i = ").append(std::to_string(i)).append(", j = ").append(std::to_string(j)));

preTask.precede(commonTask);

postTask.succeed(commonTask);

preTask.acquire(semaphore);

postTask.release(semaphore);

}

flow.dump(std::cout);

std::cout << "Start!" << std::endl;

exec.run(flow).wait();

std::cout << "End!" << std::endl;

}

TEST_CASE("Semaphore.Deadlock.8threads" * doctest::timeout(300)) {

deadlock(8);

}

taskflow/unittests/test_semaphores.cpp at master · taskflow/taskflow · GitHub

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