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/* Copyright 2013 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <iosfwd>
#include <string>
#ifndef _WIN32
#include <unistd.h>
#endif
#include "mongo/platform/cstdint.h"
#include "mongo/platform/hash_namespace.h"
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();
/**
* 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 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; }
private:
explicit ProcessId(NativeProcessId npid): _npid(npid) {}
NativeProcessId _npid;
};
std::ostream& operator<<(std::ostream& os, ProcessId pid);
} // namespace mongo
MONGO_HASH_NAMESPACE_START
template<> struct hash< ::mongo::ProcessId > {
size_t operator()(const ::mongo::ProcessId pid) const {
return hash< ::mongo::uint32_t >()(pid.asUInt32());
}
};
MONGO_HASH_NAMESPACE_END
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