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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright © 2020-2021 Florian Fischer
#include <sys/eventfd.h> // for eventfd, EFD_SEMAPHORE
#include <cerrno> // for errno
#include <cstdint> // for uint64_t, int32_t
#include <cstdlib> // for exit, EXIT_SUCCESS
#include "Common.hpp" // for DIE_MSG_ERRNO
#include "CountingPrivateSemaphore.hpp" // for CPS
#include "emper.hpp" // for spawn
#include "io/Future.hpp" // for ReadFuture, WriteFuture
using emper::io::ReadFuture;
using emper::io::WriteFuture;
void emperTest() {
CPS cps;
int efd = eventfd(0, EFD_SEMAPHORE);
if (efd == -1) {
DIE_MSG_ERRNO("eventfd failed");
}
uint64_t read_buf;
ReadFuture read_future(efd, &read_buf, sizeof(read_buf), 0);
uint64_t write_buf = 1;
WriteFuture write_future(efd, &write_buf, sizeof(write_buf), 0);
const int ITERATIONS = 100;
spawn(
[&read_future] {
for (int i = 0; i < ITERATIONS; ++i) {
int32_t res = read_future.submitAndWait();
if (res < 0) {
errno = -res;
DIE_MSG_ERRNO("read failed");
}
// reset the BPS used to signal the completion of this future
read_future.reset();
}
},
cps);
spawn(
[&write_future] {
for (int i = 0; i < ITERATIONS; ++i) {
int32_t res = write_future.submitAndWait();
if (res < 0) {
errno = -res;
DIE_MSG_ERRNO("write failed");
}
// reset the BPS used to signal the completion of this future
write_future.reset();
}
},
cps);
// Wait for the fibers to finish.
cps.wait();
exit(EXIT_SUCCESS);
}