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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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29
Kernel/Thread.cpp
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@ -46,8 +46,6 @@
namespace Kernel {
Thread* Thread::current;
HashTable<Thread*>& thread_table()
{
ASSERT_INTERRUPTS_DISABLED();
@ -61,13 +59,12 @@ Thread::Thread(Process& process)
: m_process(process)
, m_name(process.name())
{
if (m_process.m_thread_count == 0) {
if (m_process.m_thread_count.fetch_add(1, AK::MemoryOrder::memory_order_acq_rel) == 0) {
// First thread gets TID == PID
m_tid = process.pid();
} else {
m_tid = Process::allocate_pid();
}
process.m_thread_count++;
#ifdef THREAD_DEBUG
dbg() << "Created new thread " << process.name() << "(" << process.pid() << ":" << m_tid << ")";
#endif
@ -127,14 +124,14 @@ Thread::~Thread()
thread_table().remove(this);
}
ASSERT(m_process.m_thread_count);
m_process.m_thread_count--;
auto thread_cnt_before = m_process.m_thread_count.fetch_sub(1, AK::MemoryOrder::memory_order_acq_rel);
ASSERT(thread_cnt_before != 0);
}
void Thread::unblock()
{
m_blocker = nullptr;
if (current == this) {
if (Thread::current() == this) {
if (m_should_die)
set_state(Thread::Dying);
else
@ -179,7 +176,7 @@ void Thread::set_should_die()
void Thread::die_if_needed()
{
ASSERT(current == this);
ASSERT(Thread::current() == this);
if (!m_should_die)
return;
@ -213,7 +210,7 @@ u64 Thread::sleep(u32 ticks)
{
ASSERT(state() == Thread::Running);
u64 wakeup_time = g_uptime + ticks;
auto ret = Thread::current->block<Thread::SleepBlocker>(wakeup_time);
auto ret = Thread::current()->block<Thread::SleepBlocker>(wakeup_time);
if (wakeup_time > g_uptime) {
ASSERT(ret != Thread::BlockResult::WokeNormally);
}
@ -223,7 +220,7 @@ u64 Thread::sleep(u32 ticks)
u64 Thread::sleep_until(u64 wakeup_time)
{
ASSERT(state() == Thread::Running);
auto ret = Thread::current->block<Thread::SleepBlocker>(wakeup_time);
auto ret = Thread::current()->block<Thread::SleepBlocker>(wakeup_time);
if (wakeup_time > g_uptime)
ASSERT(ret != Thread::BlockResult::WokeNormally);
return wakeup_time;
@ -261,7 +258,7 @@ const char* Thread::state_string() const
void Thread::finalize()
{
ASSERT(current == g_finalizer);
ASSERT(Thread::current() == g_finalizer);
#ifdef THREAD_DEBUG
dbg() << "Finalizing thread " << *this;
@ -283,7 +280,7 @@ void Thread::finalize()
void Thread::finalize_dying_threads()
{
ASSERT(current == g_finalizer);
ASSERT(Thread::current() == g_finalizer);
Vector<Thread*, 32> dying_threads;
{
InterruptDisabler disabler;
@ -296,7 +293,7 @@ void Thread::finalize_dying_threads()
auto& process = thread->process();
thread->finalize();
delete thread;
if (process.m_thread_count == 0)
if (process.m_thread_count.load(AK::MemoryOrder::memory_order_consume) == 0)
process.finalize();
}
}
@ -770,7 +767,7 @@ String Thread::backtrace_impl() const
Vector<RecognizedSymbol, 128> recognized_symbols;
u32 start_frame;
if (current == this) {
if (Thread::current() == this) {
asm volatile("movl %%ebp, %%eax"
: "=a"(start_frame));
} else {
@ -853,7 +850,7 @@ Thread::BlockResult Thread::wait_on(WaitQueue& queue, timeval* timeout, Atomic<b
if (lock)
*lock = false;
set_state(State::Queued);
queue.enqueue(*current);
queue.enqueue(*Thread::current());
if (timeout) {
@ -888,7 +885,7 @@ Thread::BlockResult Thread::wait_on(WaitQueue& queue, timeval* timeout, Atomic<b
void Thread::wake_from_queue()
{
ASSERT(state() == State::Queued);
if (this != Thread::current)
if (this != Thread::current())
set_state(State::Runnable);
else
set_state(State::Running);