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//
// Copyright 2012-2013,2016-2017 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#pragma once
#include <uhd/config.hpp>
#include <uhd/types/time_spec.hpp>
#include <atomic>
#include <chrono>
namespace uhd {
/*! DEPRECATED -- May be removed in coming versions of UHD.
*
* Claimer class to provide synchronization for multi-thread access.
*
* Implements a spinlock mutex with a timeout.
*/
class simple_claimer
{
public:
simple_claimer(void)
{
_locked.clear();
}
inline void release(void)
{
_locked.clear(std::memory_order_release);
}
//!
// \param timeout Timeout in seconds
inline bool claim_with_wait(const double timeout)
{
const auto exit_time = std::chrono::high_resolution_clock::now()
+ std::chrono::microseconds(int64_t(timeout * 1e6));
// Try acquiring lock until successful or timeout
while (_locked.test_and_set(std::memory_order_acquire)) {
if (std::chrono::high_resolution_clock::now() > exit_time) {
return false;
}
std::this_thread::yield();
}
return true;
}
private:
std::atomic_flag _locked;
};
} // namespace uhd
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