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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#pragma once
#include <seastar/core/reactor.hh>
#include <sys/eventfd.h>
namespace ceph::thread {
/// a synchronization primitive can be used to block a seastar thread, until
/// another thread notifies it.
class Condition {
seastar::file_desc file_desc;
int fd;
seastar::pollable_fd_state fd_state;
eventfd_t event = 0;
public:
Condition()
: file_desc{seastar::file_desc::eventfd(0, 0)},
fd(file_desc.get()),
fd_state{std::move(file_desc)}
{}
seastar::future<> wait() {
return seastar::engine().read_some(fd_state, &event, sizeof(event))
.then([](size_t) {
return seastar::now();
});
}
void notify() {
eventfd_t result = 1;
::eventfd_write(fd, result);
}
};
} // namespace ceph::thread
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