esp-idf/components/pthread/test/test_cxx_cond_var.cpp

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#include <iostream>
#include <thread>
#include <condition_variable>
#include <chrono>
#include <mutex>
#include <atomic>
#include <unistd.h>
#include "freertos/FreeRTOS.h"
#include "unity.h"
#if __GTHREADS && __GTHREADS_CXX0X
static std::condition_variable cv;
static std::mutex cv_m;
static std::atomic<int> i{0};
static void waits(int idx, int timeout_ms)
{
std::unique_lock<std::mutex> lk(cv_m);
auto now = std::chrono::system_clock::now();
if(cv.wait_until(lk, now + std::chrono::milliseconds(timeout_ms), [](){return i == 1;}))
std::cout << "Thread " << idx << " finished waiting. i == " << i << '\n';
else
std::cout << "Thread " << idx << " timed out. i == " << i << '\n';
}
static void signals(int signal_ms)
{
std::this_thread::sleep_for(std::chrono::milliseconds(signal_ms));
std::cout << "Notifying...\n";
cv.notify_all();
std::this_thread::sleep_for(std::chrono::milliseconds(signal_ms));
i = 1;
std::cout << "Notifying again...\n";
cv.notify_all();
}
TEST_CASE("C++ condition_variable", "[std::condition_variable]")
{
i = 0;
std::thread t1(waits, 1, 100), t2(waits, 2, 800), t3(signals, 200);
t1.join();
t2.join();
t3.join();
std::cout << "All threads joined\n";
}
TEST_CASE("cxx: condition_variable can timeout", "[cxx]")
{
std::condition_variable cv;
std::mutex mtx;
std::unique_lock<std::mutex> lck(mtx);
srand(99);
for (int i = 0; i < 10; ++i) {
usleep(rand() % 1000);
auto status = cv.wait_for(lck, std::chrono::milliseconds(200));
TEST_ASSERT_EQUAL(std::cv_status::timeout, status);
}
}
TEST_CASE("cxx: condition_variable timeout never before deadline", "[cxx]")
{
using SysClock = std::chrono::system_clock;
std::mutex mutex;
std::condition_variable cond;
std::unique_lock<std::mutex> lock(mutex);
for (int i = 0; i < 25; ++i) {
auto timeout = std::chrono::milliseconds(portTICK_PERIOD_MS * (i+1));
auto deadline = SysClock::now() + timeout;
auto secs = std::chrono::time_point_cast<std::chrono::seconds>(deadline);
auto nsecs = std::chrono::duration_cast<std::chrono::nanoseconds>
(deadline - secs);
struct timespec ts = {
.tv_sec = static_cast<time_t>(secs.time_since_epoch().count()),
.tv_nsec = static_cast<long>(nsecs.count())};
int rc = ::pthread_cond_timedwait(cond.native_handle(),
lock.mutex()->native_handle(), &ts);
auto status = (rc == ETIMEDOUT) ? std::cv_status::timeout :
std::cv_status::no_timeout;
auto end = SysClock::now();
auto extra = end - deadline;
auto extra_us = extra / std::chrono::microseconds(1);
printf("timeout %lldms Extra time: %lldus, status: %s\n", timeout.count(), extra_us,
(status == std::cv_status::timeout) ? "timeout" : "no timeout");
// The timed wait should always return at least 1us after the timeout deadline
TEST_ASSERT_GREATER_THAN(0, extra_us);
}
}
#endif // __GTHREADS && __GTHREADS_CXX0X