libcruft-util/test/thread/event.cpp

40 lines
956 B
C++
Raw Normal View History

#include "thread/event.hpp"
#include "tap.hpp"
#include <atomic>
#include <thread>
int
main ()
{
util::TAP::logger tap;
// create an event which a thread will wait on. after it's been woken up
// it will modify the contents of val. this will be tested at a couple of
// points for consistency.
//
// the test isn't 100% deterministic (because we're attempting to create
// specific timings by just waiting). but it's a decent first check.
std::atomic<int> val = 0;
util::thread::event a;
std::thread t ([&] () {
a.wait ();
++val;
});
// block for hopefully long enough to allow the above thread to change
// the value of the integer.
std::this_thread::sleep_for (std::chrono::milliseconds (100));
tap.expect_eq (val, 0, "waiting actually blocks");
a.notify ();
t.join ();
tap.expect_eq (val, 1, "notification released the lock");
return tap.status ();
}