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1// Copyright 2023, Collabora, Ltd.
2// SPDX-License-Identifier: BSL-1.0
3/*!
4 * @file
5 * @brief A very simple generator to create process unique ids.
6 * @author Jakob Bornecrantz <jakob@collabora.com>
7 * @ingroup aux_util
8 */
9
10#include "u_limited_unique_id.h"
11
12#include <atomic>
13
14
15/*
16 * This code is in C++ and not C because MSVC doesn't implement C atomics yet,
17 * but to make things even more fun the C++11 standard defines atomic_uint64_t
18 * as optional, but atomic_uint_fast64_t is listed as required, so here we are.
19 */
20static std::atomic_uint_fast64_t generator;
21
22extern "C" xrt_limited_unique_id_t
23u_limited_unique_id_get(void)
24{
25 return xrt_limited_unique_id_t{static_cast<uint64_t>(++generator)};
26}