mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-06 17:06:31 +00:00
Kernel: Stop using HashMap in Mutex
This commit removes the usage of HashMap in Mutex, thereby making Mutex be allocation-free. In order to achieve this several simplifications were made to Mutex, removing unused code-paths and extra VERIFYs: * We no longer support 'upgrading' a shared lock holder to an exclusive holder when it is the only shared holder and it did not unlock the lock before relocking it as exclusive. NOTE: Unlike the rest of these changes, this scenario is not VERIFY-able in an allocation-free way, as a result the new LOCK_SHARED_UPGRADE_DEBUG debug flag was added, this flag lets Mutex allocate in order to detect such cases when debugging a deadlock. * We no longer support checking if a Mutex is locked by the current thread when the Mutex was not locked exclusively, the shared version of this check was not used anywhere. * We no longer support force unlocking/relocking a Mutex if the Mutex was not locked exclusively, the shared version of these functions was not used anywhere.
This commit is contained in:
parent
60aa4152e9
commit
e28af4a2fc
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@ -182,6 +182,10 @@
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#cmakedefine01 LOCK_RESTORE_DEBUG
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#endif
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#ifndef LOCK_SHARED_UPGRADE_DEBUG
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#cmakedefine01 LOCK_SHARED_UPGRADE_DEBUG
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#endif
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#ifndef LOCK_TRACE_DEBUG
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#cmakedefine01 LOCK_TRACE_DEBUG
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#endif
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@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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@ -31,12 +32,15 @@ void Mutex::lock(Mode mode, [[maybe_unused]] LockLocation const& location)
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dbgln_if(LOCK_TRACE_DEBUG, "Mutex::lock @ ({}) {}: acquire {}, currently unlocked", this, m_name, mode_to_string(mode));
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m_mode = mode;
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VERIFY(!m_holder);
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VERIFY(m_shared_holders.is_empty());
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VERIFY(m_shared_holders == 0);
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if (mode == Mode::Exclusive) {
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m_holder = current_thread;
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} else {
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VERIFY(mode == Mode::Shared);
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m_shared_holders.set(current_thread, 1);
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++m_shared_holders;
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#if LOCK_SHARED_UPGRADE_DEBUG
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m_shared_holders_map.set(current_thread, 1);
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#endif
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}
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VERIFY(m_times_locked == 0);
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m_times_locked++;
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@ -59,12 +63,11 @@ void Mutex::lock(Mode mode, [[maybe_unused]] LockLocation const& location)
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if (m_mode == Mode::Exclusive) {
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VERIFY(m_holder == current_thread);
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VERIFY(m_shared_holders.is_empty());
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VERIFY(m_shared_holders == 0);
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} else if (did_block && mode == Mode::Shared) {
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// Only if we blocked trying to acquire a shared lock the lock would have been converted
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VERIFY(!m_holder);
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VERIFY(!m_shared_holders.is_empty());
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VERIFY(m_shared_holders.find(current_thread) != m_shared_holders.end());
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VERIFY(m_shared_holders > 0);
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}
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if constexpr (LOCK_TRACE_DEBUG) {
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@ -89,19 +92,14 @@ void Mutex::lock(Mode mode, [[maybe_unused]] LockLocation const& location)
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case Mode::Shared: {
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VERIFY(!m_holder);
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if (mode == Mode::Exclusive) {
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if (m_shared_holders.size() == 1) {
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auto it = m_shared_holders.begin();
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if (it->key == current_thread) {
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it->value++;
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m_times_locked++;
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m_mode = Mode::Exclusive;
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m_holder = current_thread;
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m_shared_holders.clear();
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dbgln_if(LOCK_TRACE_DEBUG, "Mutex::lock @ {} ({}): acquire {}, converted shared to exclusive lock, locks held {}", this, m_name, mode_to_string(mode), m_times_locked);
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return;
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}
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}
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dbgln_if(LOCK_TRACE_DEBUG, "Mutex::lock @ {} ({}): blocking for exclusive access, currently shared, locks held {}", this, m_name, m_times_locked);
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#if LOCK_SHARED_UPGRADE_DEBUG
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VERIFY(m_shared_holders_map.size() != 1 || m_shared_holders_map.begin()->key != current_thread);
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#endif
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// WARNING: The following block will deadlock if the current thread is the only shared locker of this Mutex
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// and is asking to upgrade the lock to be exclusive without first releasing the shared lock. We have no
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// allocation-free way to detect such a scenario, so if you suspect that this is the cause of your deadlock,
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// try turning on LOCK_SHARED_UPGRADE_DEBUG.
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block(*current_thread, mode, lock, 1);
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did_block = true;
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VERIFY(m_mode == mode);
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@ -112,23 +110,26 @@ void Mutex::lock(Mode mode, [[maybe_unused]] LockLocation const& location)
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VERIFY(m_times_locked > 0);
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if (m_mode == Mode::Shared) {
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VERIFY(!m_holder);
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VERIFY(!did_block || m_shared_holders.contains(current_thread));
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VERIFY(!did_block);
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} else if (did_block) {
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VERIFY(mode == Mode::Exclusive);
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VERIFY(m_holder == current_thread);
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VERIFY(m_shared_holders.is_empty());
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VERIFY(m_shared_holders == 0);
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}
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if (!did_block) {
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// if we didn't block we must still be a shared lock
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VERIFY(m_mode == Mode::Shared);
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m_times_locked++;
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VERIFY(!m_shared_holders.is_empty());
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auto it = m_shared_holders.find(current_thread);
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if (it != m_shared_holders.end())
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VERIFY(m_shared_holders > 0);
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++m_shared_holders;
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#if LOCK_SHARED_UPGRADE_DEBUG
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auto it = m_shared_holders_map.find(current_thread);
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if (it != m_shared_holders_map.end())
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it->value++;
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else
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m_shared_holders.set(current_thread, 1);
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m_shared_holders_map.set(current_thread, 1);
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#endif
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}
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#if LOCK_DEBUG
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@ -166,20 +167,21 @@ void Mutex::unlock()
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switch (current_mode) {
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case Mode::Exclusive:
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VERIFY(m_holder == current_thread);
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VERIFY(m_shared_holders.is_empty());
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VERIFY(m_shared_holders == 0);
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if (m_times_locked == 0)
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m_holder = nullptr;
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break;
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case Mode::Shared: {
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VERIFY(!m_holder);
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auto it = m_shared_holders.find(current_thread);
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VERIFY(it != m_shared_holders.end());
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if (it->value > 1) {
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VERIFY(m_shared_holders > 0);
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--m_shared_holders;
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#if LOCK_SHARED_UPGRADE_DEBUG
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auto it = m_shared_holders_map.find(current_thread);
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if (it->value > 1)
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it->value--;
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} else {
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VERIFY(it->value > 0);
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m_shared_holders.remove(it);
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}
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else
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m_shared_holders_map.remove(it);
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#endif
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break;
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}
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default:
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@ -193,7 +195,7 @@ void Mutex::unlock()
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#endif
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if (m_times_locked == 0) {
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VERIFY(current_mode == Mode::Exclusive ? !m_holder : m_shared_holders.is_empty());
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VERIFY(current_mode == Mode::Exclusive ? !m_holder : m_shared_holders == 0);
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m_mode = Mode::Unlocked;
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unblock_waiters(current_mode);
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@ -230,8 +232,11 @@ void Mutex::unblock_waiters(Mode previous_mode)
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m_mode = Mode::Shared;
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for (auto& thread : m_blocked_threads_list_shared) {
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auto requested_locks = thread.unblock_from_lock(*this);
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auto set_result = m_shared_holders.set(&thread, requested_locks);
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m_shared_holders += requested_locks;
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#if LOCK_SHARED_UPGRADE_DEBUG
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auto set_result = m_shared_holders_map.set(&thread, requested_locks);
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VERIFY(set_result == AK::HashSetResult::InsertedNewEntry);
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#endif
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m_times_locked += requested_locks;
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}
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return true;
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@ -255,7 +260,7 @@ void Mutex::unblock_waiters(Mode previous_mode)
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}
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}
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auto Mutex::force_unlock_if_locked(u32& lock_count_to_restore) -> Mode
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auto Mutex::force_unlock_exclusive_if_locked(u32& lock_count_to_restore) -> Mode
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{
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// NOTE: This may be called from an interrupt handler (not an IRQ handler)
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// and also from within critical sections!
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@ -270,7 +275,7 @@ auto Mutex::force_unlock_if_locked(u32& lock_count_to_restore) -> Mode
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return Mode::Unlocked;
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}
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dbgln_if(LOCK_RESTORE_DEBUG, "Mutex::force_unlock_if_locked @ {}: unlocking exclusive with lock count: {}", this, m_times_locked);
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dbgln_if(LOCK_RESTORE_DEBUG, "Mutex::force_unlock_exclusive_if_locked @ {}: unlocking exclusive with lock count: {}", this, m_times_locked);
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#if LOCK_DEBUG
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m_holder->holding_lock(*this, -(int)m_times_locked, {});
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#endif
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@ -282,32 +287,6 @@ auto Mutex::force_unlock_if_locked(u32& lock_count_to_restore) -> Mode
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unblock_waiters(Mode::Exclusive);
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break;
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}
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case Mode::Shared: {
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VERIFY(!m_holder);
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auto it = m_shared_holders.find(current_thread);
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if (it == m_shared_holders.end()) {
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lock_count_to_restore = 0;
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return Mode::Unlocked;
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}
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dbgln_if(LOCK_RESTORE_DEBUG, "Mutex::force_unlock_if_locked @ {}: unlocking exclusive with lock count: {}, total locks: {}",
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this, it->value, m_times_locked);
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VERIFY(it->value > 0);
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lock_count_to_restore = it->value;
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VERIFY(lock_count_to_restore > 0);
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#if LOCK_DEBUG
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m_holder->holding_lock(*this, -(int)lock_count_to_restore, {});
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#endif
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m_shared_holders.remove(it);
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VERIFY(m_times_locked >= lock_count_to_restore);
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m_times_locked -= lock_count_to_restore;
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if (m_times_locked == 0) {
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m_mode = Mode::Unlocked;
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unblock_waiters(Mode::Shared);
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}
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break;
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}
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case Mode::Unlocked: {
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lock_count_to_restore = 0;
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break;
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return current_mode;
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}
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void Mutex::restore_lock(Mode mode, u32 lock_count, [[maybe_unused]] LockLocation const& location)
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void Mutex::restore_exclusive_lock(u32 lock_count, [[maybe_unused]] LockLocation const& location)
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{
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VERIFY(mode != Mode::Unlocked);
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VERIFY(lock_count > 0);
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VERIFY(!Processor::current_in_irq());
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auto* current_thread = Thread::current();
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bool did_block = false;
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SpinlockLocker lock(m_lock);
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switch (mode) {
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case Mode::Exclusive: {
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auto previous_mode = m_mode;
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if ((m_mode == Mode::Exclusive && m_holder != current_thread)
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|| (m_mode == Mode::Shared && (m_shared_holders.size() != 1 || !m_shared_holders.contains(current_thread)))) {
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[[maybe_unused]] auto previous_mode = m_mode;
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if (m_mode == Mode::Exclusive && m_holder != current_thread) {
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block(*current_thread, Mode::Exclusive, lock, lock_count);
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did_block = true;
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// If we blocked then m_mode should have been updated to what we requested
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VERIFY(m_mode == Mode::Exclusive);
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}
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dbgln_if(LOCK_RESTORE_DEBUG, "Mutex::restore_lock @ {}: restoring {} with lock count {}, was {}", this, mode_to_string(mode), lock_count, mode_to_string(previous_mode));
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dbgln_if(LOCK_RESTORE_DEBUG, "Mutex::restore_exclusive_lock @ {}: restoring exclusive with lock count {}, was {}", this, lock_count, mode_to_string(previous_mode));
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VERIFY(m_mode != Mode::Shared);
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VERIFY(m_shared_holders.is_empty());
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VERIFY(m_shared_holders == 0);
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if (did_block) {
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VERIFY(m_times_locked > 0);
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VERIFY(m_holder == current_thread);
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@ -351,14 +326,6 @@ void Mutex::restore_lock(Mode mode, u32 lock_count, [[maybe_unused]] LockLocatio
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m_times_locked = lock_count;
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VERIFY(!m_holder);
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m_holder = current_thread;
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} else if (m_mode == Mode::Shared) {
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// Upgrade the shared lock to an exclusive lock
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VERIFY(!m_holder);
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VERIFY(m_shared_holders.size() == 1);
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VERIFY(m_shared_holders.contains(current_thread));
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m_mode = Mode::Exclusive;
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m_holder = current_thread;
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m_shared_holders.clear();
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} else {
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VERIFY(m_mode == Mode::Exclusive);
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VERIFY(m_holder == current_thread);
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@ -370,55 +337,6 @@ void Mutex::restore_lock(Mode mode, u32 lock_count, [[maybe_unused]] LockLocatio
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#if LOCK_DEBUG
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m_holder->holding_lock(*this, (int)lock_count, location);
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#endif
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return;
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}
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case Mode::Shared: {
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auto previous_mode = m_mode;
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if (m_mode == Mode::Exclusive && m_holder != current_thread) {
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block(*current_thread, Mode::Shared, lock, lock_count);
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did_block = true;
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// If we blocked then m_mode should have been updated to what we requested
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VERIFY(m_mode == Mode::Shared);
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}
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dbgln_if(LOCK_RESTORE_DEBUG, "Mutex::restore_lock @ {}: restoring {} with lock count {}, was {}",
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this, mode_to_string(mode), lock_count, mode_to_string(previous_mode));
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VERIFY(!m_holder);
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if (did_block) {
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VERIFY(m_times_locked > 0);
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VERIFY(m_shared_holders.contains(current_thread));
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} else {
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if (m_mode == Mode::Unlocked) {
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m_mode = Mode::Shared;
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m_times_locked += lock_count;
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auto set_result = m_shared_holders.set(current_thread, lock_count);
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// There may be other shared lock holders already, but we should not have an entry yet
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VERIFY(set_result == AK::HashSetResult::InsertedNewEntry);
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} else if (m_mode == Mode::Shared) {
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m_times_locked += lock_count;
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if (auto it = m_shared_holders.find(current_thread); it != m_shared_holders.end()) {
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it->value += lock_count;
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} else {
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auto set_result = m_shared_holders.set(current_thread, lock_count);
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// There may be other shared lock holders already, but we should not have an entry yet
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VERIFY(set_result == AK::HashSetResult::InsertedNewEntry);
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}
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} else {
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VERIFY(m_mode == Mode::Exclusive);
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VERIFY(m_holder == current_thread);
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m_times_locked += lock_count;
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}
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}
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#if LOCK_DEBUG
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m_holder->holding_lock(*this, (int)lock_count, location);
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#endif
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return;
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}
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default:
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VERIFY_NOT_REACHED();
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}
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}
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}
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@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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@ -33,23 +34,23 @@ public:
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~Mutex() = default;
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void lock(Mode mode = Mode::Exclusive, LockLocation const& location = LockLocation::current());
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void restore_lock(Mode, u32, LockLocation const& location = LockLocation::current());
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void restore_exclusive_lock(u32, LockLocation const& location = LockLocation::current());
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void unlock();
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[[nodiscard]] Mode force_unlock_if_locked(u32&);
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[[nodiscard]] Mode force_unlock_exclusive_if_locked(u32&);
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[[nodiscard]] bool is_locked() const
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{
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SpinlockLocker lock(m_lock);
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return m_mode != Mode::Unlocked;
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}
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[[nodiscard]] bool is_locked_by_current_thread() const
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[[nodiscard]] bool is_exclusively_locked_by_current_thread() const
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{
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SpinlockLocker lock(m_lock);
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if (m_mode == Mode::Exclusive)
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return m_holder == Thread::current();
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if (m_mode == Mode::Shared)
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return m_shared_holders.contains(Thread::current());
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VERIFY(m_mode != Mode::Shared); // This method should only be used on exclusively-held locks
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if (m_mode == Mode::Unlocked)
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return false;
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return m_holder == Thread::current();
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}
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[[nodiscard]] StringView name() const { return m_name; }
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@ -93,12 +94,16 @@ private:
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// When locked exclusively, this is always the one thread that holds the
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// lock.
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RefPtr<Thread> m_holder;
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HashMap<Thread*, u32> m_shared_holders;
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size_t m_shared_holders { 0 };
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BlockedThreadList m_blocked_threads_list_exclusive;
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BlockedThreadList m_blocked_threads_list_shared;
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mutable Spinlock m_lock;
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#if LOCK_SHARED_UPGRADE_DEBUG
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HashMap<Thread*, u32> m_shared_holders_map;
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#endif
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};
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class MutexLocker {
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@ -132,7 +132,7 @@ protected:
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ErrorOr<void> so_error() const
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{
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VERIFY(m_mutex.is_locked_by_current_thread());
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VERIFY(m_mutex.is_exclusively_locked_by_current_thread());
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return m_so_error;
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}
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@ -105,7 +105,7 @@ void Process::kill_threads_except_self()
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});
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u32 dropped_lock_count = 0;
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if (big_lock().force_unlock_if_locked(dropped_lock_count) != LockMode::Unlocked)
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if (big_lock().force_unlock_exclusive_if_locked(dropped_lock_count) != LockMode::Unlocked)
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dbgln("Process {} big lock had {} locks", *this, dropped_lock_count);
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}
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@ -978,10 +978,10 @@ inline ProcessID Thread::pid() const
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}
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#define VERIFY_PROCESS_BIG_LOCK_ACQUIRED(process) \
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VERIFY(process->big_lock().is_locked_by_current_thread());
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VERIFY(process->big_lock().is_exclusively_locked_by_current_thread());
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#define VERIFY_NO_PROCESS_BIG_LOCK(process) \
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VERIFY(!process->big_lock().is_locked_by_current_thread());
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VERIFY(!process->big_lock().is_exclusively_locked_by_current_thread());
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||||
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inline static ErrorOr<NonnullOwnPtr<KString>> try_copy_kstring_from_user(const Kernel::Syscall::StringArgument& string)
|
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{
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||||
|
|
|
@ -630,7 +630,7 @@ ErrorOr<void> Process::do_exec(NonnullRefPtr<OpenFileDescription> main_program_d
|
|||
}
|
||||
|
||||
u32 lock_count_to_restore;
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||||
[[maybe_unused]] auto rc = big_lock().force_unlock_if_locked(lock_count_to_restore);
|
||||
[[maybe_unused]] auto rc = big_lock().force_unlock_exclusive_if_locked(lock_count_to_restore);
|
||||
VERIFY_INTERRUPTS_DISABLED();
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||||
VERIFY(Processor::in_critical());
|
||||
return {};
|
||||
|
|
|
@ -193,7 +193,7 @@ void Thread::block(Kernel::Mutex& lock, SpinlockLocker<Spinlock>& lock_lock, u32
|
|||
// Yield to the scheduler, and wait for us to resume unblocked.
|
||||
VERIFY(!g_scheduler_lock.is_locked_by_current_processor());
|
||||
VERIFY(Processor::in_critical());
|
||||
if (&lock != &big_lock && big_lock.is_locked_by_current_thread()) {
|
||||
if (&lock != &big_lock && big_lock.is_exclusively_locked_by_current_thread()) {
|
||||
// We're locking another lock and already hold the big lock...
|
||||
// We need to release the big lock
|
||||
yield_and_release_relock_big_lock();
|
||||
|
@ -390,7 +390,7 @@ void Thread::exit(void* exit_value)
|
|||
void Thread::yield_without_releasing_big_lock(VerifyLockNotHeld verify_lock_not_held)
|
||||
{
|
||||
VERIFY(!g_scheduler_lock.is_locked_by_current_processor());
|
||||
VERIFY(verify_lock_not_held == VerifyLockNotHeld::No || !process().big_lock().is_locked_by_current_thread());
|
||||
VERIFY(verify_lock_not_held == VerifyLockNotHeld::No || !process().big_lock().is_exclusively_locked_by_current_thread());
|
||||
// Disable interrupts here. This ensures we don't accidentally switch contexts twice
|
||||
InterruptDisabler disable;
|
||||
Scheduler::yield(); // flag a switch
|
||||
|
@ -415,7 +415,7 @@ void Thread::yield_and_release_relock_big_lock()
|
|||
|
||||
LockMode Thread::unlock_process_if_locked(u32& lock_count_to_restore)
|
||||
{
|
||||
return process().big_lock().force_unlock_if_locked(lock_count_to_restore);
|
||||
return process().big_lock().force_unlock_exclusive_if_locked(lock_count_to_restore);
|
||||
}
|
||||
|
||||
void Thread::relock_process(LockMode previous_locked, u32 lock_count_to_restore)
|
||||
|
@ -433,7 +433,7 @@ void Thread::relock_process(LockMode previous_locked, u32 lock_count_to_restore)
|
|||
|
||||
if (previous_locked != LockMode::Unlocked) {
|
||||
// We've unblocked, relock the process if needed and carry on.
|
||||
process().big_lock().restore_lock(previous_locked, lock_count_to_restore);
|
||||
process().big_lock().restore_exclusive_lock(lock_count_to_restore);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
@ -106,6 +106,7 @@ set(LOCK_DEBUG ON)
|
|||
set(LOCK_IN_CRITICAL_DEBUG ON)
|
||||
set(LOCK_RANK_ENFORCEMENT ON)
|
||||
set(LOCK_RESTORE_DEBUG ON)
|
||||
set(LOCK_SHARED_UPGRADE_DEBUG ON)
|
||||
set(LOCK_TRACE_DEBUG ON)
|
||||
set(LOOKUPSERVER_DEBUG ON)
|
||||
set(MALLOC_DEBUG ON)
|
||||
|
|
Loading…
Reference in a new issue