70 lines
1.2 KiB
C++
70 lines
1.2 KiB
C++
/*
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* \brief Allocator for UDP/TCP ports
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2016-08-19
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*/
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/*
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* Copyright (C) 2016 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _PORT_ALLOCATOR_H_
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#define _PORT_ALLOCATOR_H_
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/* Genode includes */
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#include <util/bit_allocator.h>
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namespace Net {
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class Port_allocator;
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class Port_allocator_guard;
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bool dynamic_port(Genode::uint16_t const port);
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}
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class Net::Port_allocator
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{
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public:
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enum { FIRST = 49152, COUNT = 16384 };
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private:
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Genode::Bit_allocator<COUNT> _alloc;
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public:
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Genode::uint16_t alloc() { return _alloc.alloc() + FIRST; }
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void free(Genode::uint16_t port) { _alloc.free(port - FIRST); }
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};
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class Net::Port_allocator_guard
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{
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private:
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Port_allocator &_port_alloc;
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unsigned const _max;
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unsigned _used = 0;
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public:
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class Out_of_indices : Genode::Exception {};
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Genode::uint16_t alloc();
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void free(Genode::uint16_t port);
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Port_allocator_guard(Port_allocator & port_alloc, unsigned const max);
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unsigned max() const { return _max; }
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};
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#endif /* _PORT_ALLOCATOR_H_ */
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