fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
32 lines
700 B
C++
32 lines
700 B
C++
/*
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* Copyright (C) 2021-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <cstdint>
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#include <utility>
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#include <unistd.h>
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struct perf_event_attr; // from <linux/perf_event.h>
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class linux_perf_event {
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int _fd = -1;
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public:
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linux_perf_event(const struct ::perf_event_attr& attr, pid_t pid, int cpu, int group_fd, unsigned long flags);
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linux_perf_event(linux_perf_event&& x) noexcept : _fd(std::exchange(x._fd, -1)) {}
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linux_perf_event& operator=(linux_perf_event&& x) noexcept;
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~linux_perf_event();
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uint64_t read();
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void enable();
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void disable();
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public:
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static linux_perf_event user_instructions_retired();
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};
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