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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <cstdint>
#include <iosfwd>
#include <string>
#ifndef _WIN32
#include <unistd.h>
#endif
namespace mongo {
#ifdef _WIN32
typedef DWORD NativeProcessId;
#else
typedef pid_t NativeProcessId;
#endif
/**
* Platform-independent representation of a process identifier.
*/
class ProcessId {
public:
/**
* Gets the process id for the currently executing process.
*/
static ProcessId getCurrent();
/**
* Gets the thread id for the currently executing process.
*/
static ProcessId getCurrentThreadId();
/**
* Constructs a ProcessId from a NativeProcessId.
*/
static inline ProcessId fromNative(NativeProcessId npid) {
return ProcessId(npid);
}
/**
* Constructs a ProcessId with an unspecified value.
*/
ProcessId() {}
/**
* Gets the native process id corresponding to this ProcessId.
*/
NativeProcessId toNative() const {
return _npid;
}
/**
* Represents this process id as a signed 64-bit integer.
*
* This representation will faithfully serialize and format to text files, but is at least
* twice the number of bits needed to uniquely represent valid process numbers on supported
* OSes..
*/
int64_t asInt64() const;
/**
* Similar to asInt64(), for compatibility with code that uses "long long" to mean 64-bit
* signed integer.
*/
long long asLongLong() const;
/**
* Represents this process id as an unsigned 32-bit integer.
*
* This representation will contain all of the bits of the native process id, but may not
* serialize or format to text files meaningfully.
*/
uint32_t asUInt32() const {
return static_cast<uint32_t>(_npid);
}
/**
* Provides a std::string representation of the pid.
*/
std::string toString() const;
bool operator==(const ProcessId other) const {
return _npid == other._npid;
}
bool operator!=(const ProcessId other) const {
return _npid != other._npid;
}
bool operator<(const ProcessId other) const {
return _npid < other._npid;
}
bool operator<=(const ProcessId other) const {
return _npid <= other._npid;
}
bool operator>(const ProcessId other) const {
return _npid > other._npid;
}
bool operator>=(const ProcessId other) const {
return _npid >= other._npid;
}
template <typename H>
friend H AbslHashValue(
H h, const ProcessId pid) { // NOLINT(readability-avoid-const-params-in-decls)
return H::combine(std::move(h), pid.asUInt32());
}
private:
explicit ProcessId(NativeProcessId npid) : _npid(npid) {}
NativeProcessId _npid;
};
std::ostream& operator<<(std::ostream& os, ProcessId pid);
} // namespace mongo
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