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5751327195
Problem: - `static` variables consume memory and sometimes are less optimizable. - `static const` variables can be `constexpr`, usually. - `static` function-local variables require an initialization check every time the function is run. Solution: - If a global `static` variable is only used in a single function then move it into the function and make it non-`static` and `constexpr`. - Make all global `static` variables `constexpr` instead of `const`. - Change function-local `static const[expr]` variables to be just `constexpr`.
63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "PTYMultiplexer.h"
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#include "MasterPTY.h"
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#include <AK/Singleton.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Process.h>
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#include <LibC/errno_numbers.h>
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namespace Kernel {
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static AK::Singleton<PTYMultiplexer> s_the;
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PTYMultiplexer& PTYMultiplexer::the()
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{
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return *s_the;
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}
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UNMAP_AFTER_INIT PTYMultiplexer::PTYMultiplexer()
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: CharacterDevice(5, 2)
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{
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constexpr unsigned max_pty_pairs = 8;
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m_freelist.ensure_capacity(max_pty_pairs);
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for (int i = max_pty_pairs; i > 0; --i)
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m_freelist.unchecked_append(i - 1);
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}
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UNMAP_AFTER_INIT PTYMultiplexer::~PTYMultiplexer()
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{
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}
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KResultOr<NonnullRefPtr<FileDescription>> PTYMultiplexer::open(int options)
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{
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Locker locker(m_lock);
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if (m_freelist.is_empty())
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return EBUSY;
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auto master_index = m_freelist.take_last();
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auto master = adopt_ref_if_nonnull(new MasterPTY(master_index));
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if (!master)
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return ENOMEM;
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dbgln_if(PTMX_DEBUG, "PTYMultiplexer::open: Vending master {}", master->index());
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auto description = FileDescription::create(*master);
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if (!description.is_error()) {
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description.value()->set_rw_mode(options);
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description.value()->set_file_flags(options);
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}
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return description;
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}
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void PTYMultiplexer::notify_master_destroyed(Badge<MasterPTY>, unsigned index)
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{
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Locker locker(m_lock);
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m_freelist.append(index);
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dbgln_if(PTMX_DEBUG, "PTYMultiplexer: {} added to freelist", index);
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}
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}
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