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Kernel: Turn Thread::current and Process::current into functions

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This allows us to query the current thread and process on a
per processor basis
This commit is contained in:
Tom 2020-06-28 15:34:31 -06:00 • committed by Andreas Kling
parent cdc78515b6
commit 16783bd14d
39 changed files with 518 additions and 369 deletions
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14
Kernel/Lock.cpp
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@ -49,29 +49,31 @@ void Lock::lock(Mode mode)
dump_backtrace();
hang();
}
auto current_thread = Thread::current();
for (;;) {
bool expected = false;
if (m_lock.compare_exchange_strong(expected, true, AK::memory_order_acq_rel)) {
// FIXME: Do not add new readers if writers are queued.
bool modes_dont_conflict = !modes_conflict(m_mode, mode);
bool already_hold_exclusive_lock = m_mode == Mode::Exclusive && m_holder == Thread::current;
bool already_hold_exclusive_lock = m_mode == Mode::Exclusive && m_holder == current_thread;
if (modes_dont_conflict || already_hold_exclusive_lock) {
// We got the lock!
if (!already_hold_exclusive_lock)
m_mode = mode;
m_holder = Thread::current;
m_holder = current_thread;
m_times_locked++;
m_lock.store(false, AK::memory_order_release);
return;
}
timeval* timeout = nullptr;
Thread::current->wait_on(m_queue, timeout, &m_lock, m_holder, m_name);
current_thread->wait_on(m_queue, timeout, &m_lock, m_holder, m_name);
}
}
}
void Lock::unlock()
{
auto current_thread = Thread::current();
for (;;) {
bool expected = false;
if (m_lock.compare_exchange_strong(expected, true, AK::memory_order_acq_rel)) {
@ -80,8 +82,8 @@ void Lock::unlock()
ASSERT(m_mode != Mode::Unlocked);
if (m_mode == Mode::Exclusive)
ASSERT(m_holder == Thread::current);
if (m_holder == Thread::current && (m_mode == Mode::Shared || m_times_locked == 0))
ASSERT(m_holder == current_thread);
if (m_holder == current_thread && (m_mode == Mode::Shared || m_times_locked == 0))
m_holder = nullptr;
if (m_times_locked > 0) {
@ -101,7 +103,7 @@ bool Lock::force_unlock_if_locked()
{
ASSERT(m_mode != Mode::Shared);
InterruptDisabler disabler;
if (m_holder != Thread::current)
if (m_holder != Thread::current())
return false;
ASSERT(m_times_locked == 1);
m_holder = nullptr;