73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/*
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* Copyright (c) 2011, 2012, 2013, 2014, 2015, 2021 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sortix/kernel/dtable.h
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* Table of file descriptors.
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*/
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#ifndef _INCLUDE_SORTIX_KERNEL_DTABLE_H
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#define _INCLUDE_SORTIX_KERNEL_DTABLE_H
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#include <sortix/kernel/refcount.h>
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namespace Sortix {
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class Descriptor;
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struct DescriptorEntry;
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class DescriptorTable : public Refcountable
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{
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public:
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DescriptorTable();
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virtual ~DescriptorTable();
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Ref<DescriptorTable> Fork();
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Ref<Descriptor> Get(int index);
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bool Reserve(int count, int* reservation);
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void Unreserve(int* reservation);
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int Allocate(Ref<Descriptor> desc, int flags, int min_index = 0,
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int* reservation = NULL);
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int Allocate(int src_index, int flags, int min_index = 0,
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int* reservation = NULL);
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int Copy(int from, int to, int flags);
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void Free(int index);
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Ref<Descriptor> FreeKeep(int index);
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void OnExecute();
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bool SetFlags(int index, int flags);
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int GetFlags(int index);
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int Previous(int index);
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int Next(int index);
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int CloseFrom(int index);
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private:
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bool IsGoodEntry(int i);
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bool Enlargen(int need_index, int need_count);
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int AllocateInternal(Ref<Descriptor> desc, int flags, int min_index,
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int* reservation);
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Ref<Descriptor> FreeKeepInternal(int index);
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private:
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kthread_mutex_t dtablelock;
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struct DescriptorEntry* entries;
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int entries_used;
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int entries_length;
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int reserved_count;
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int first_not_taken;
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};
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} // namespace Sortix
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#endif
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