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d1371d66f7
This patch switches away from {Nonnull,}LockRefPtr to the non-locking
smart pointers throughout the kernel.
I've looked at the handful of places where these were being persisted
and I don't see any race situations.
Note that the process file descriptor table (Process::m_fds) was already
guarded via MutexProtected.
65 lines
1.8 KiB
C++
65 lines
1.8 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 <AK/Singleton.h>
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#include <Kernel/API/POSIX/errno.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Sections.h>
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#include <Kernel/TTY/MasterPTY.h>
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#include <Kernel/TTY/PTYMultiplexer.h>
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namespace Kernel {
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static 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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m_freelist.with([&](auto& freelist) {
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freelist.ensure_capacity(max_pty_pairs);
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for (int i = max_pty_pairs; i > 0; --i)
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freelist.unchecked_append(i - 1);
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});
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}
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UNMAP_AFTER_INIT PTYMultiplexer::~PTYMultiplexer() = default;
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UNMAP_AFTER_INIT void PTYMultiplexer::initialize()
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{
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MUST(the().after_inserting());
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}
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ErrorOr<NonnullRefPtr<OpenFileDescription>> PTYMultiplexer::open(int options)
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{
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return m_freelist.with([&](auto& freelist) -> ErrorOr<NonnullRefPtr<OpenFileDescription>> {
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if (freelist.is_empty())
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return EBUSY;
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auto master_index = freelist.take_last();
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auto master = TRY(MasterPTY::try_create(master_index));
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dbgln_if(PTMX_DEBUG, "PTYMultiplexer::open: Vending master {}", master->index());
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auto description = TRY(OpenFileDescription::try_create(*master));
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description->set_rw_mode(options);
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description->set_file_flags(options);
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return description;
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});
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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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m_freelist.with([&](auto& freelist) {
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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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}
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