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Kernel: Replace "current" with Thread::current and Process::current

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Suggested by Sergey. The currently running Thread and Process are now
Thread::current and Process::current respectively. :^)
This commit is contained in:
Andreas Kling 2020-02-17 15:04:27 +01:00
parent 4f4af24b9d
commit 48f7c28a5c
37 changed files with 257 additions and 252 deletions
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59
Kernel/Scheduler.cpp
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@ -67,7 +67,6 @@ static u32 time_slice_for(const Thread& thread)
return 10;
}
Thread* current;
Thread* g_finalizer;
Thread* g_colonel;
WaitQueue* g_finalizer_wait_queue;
@ -92,8 +91,8 @@ Thread::JoinBlocker::JoinBlocker(Thread& joinee, void*& joinee_exit_value)
, m_joinee_exit_value(joinee_exit_value)
{
ASSERT(m_joinee.m_joiner == nullptr);
m_joinee.m_joiner = current;
current->m_joinee = &joinee;
m_joinee.m_joiner = Thread::current;
Thread::current->m_joinee = &joinee;
}
bool Thread::JoinBlocker::should_unblock(Thread& joiner, time_t, long)
@ -320,7 +319,7 @@ bool Scheduler::pick_next()
ASSERT(s_active);
if (!current) {
if (!Thread::current) {
// XXX: The first ever context_switch() goes to the idle process.
// This to setup a reliable place we can return to.
return context_switch(*g_colonel);
@ -340,7 +339,7 @@ bool Scheduler::pick_next()
Process::for_each([&](Process& process) {
if (process.is_dead()) {
if (current->pid() != process.pid() && (!process.ppid() || !Process::from_pid(process.ppid()))) {
if (Process::current->pid() != process.pid() && (!process.ppid() || !Process::from_pid(process.ppid()))) {
auto name = process.name();
auto pid = process.pid();
auto exit_status = Process::reap(process);
@ -362,7 +361,7 @@ bool Scheduler::pick_next()
// FIXME: It would be nice if the Scheduler didn't have to worry about who is "current"
// For now, avoid dispatching signals to "current" and do it in a scheduling pass
// while some other process is interrupted. Otherwise a mess will be made.
if (&thread == current)
if (&thread == Thread::current)
return IterationDecision::Continue;
// We know how to interrupt blocked processes, but if they are just executing
// at some random point in the kernel, let them continue.
@ -442,13 +441,13 @@ bool Scheduler::donate_to(Thread* beneficiary, const char* reason)
return false;
(void)reason;
unsigned ticks_left = current->ticks_left();
unsigned ticks_left = Thread::current->ticks_left();
if (!beneficiary || beneficiary->state() != Thread::Runnable || ticks_left <= 1)
return yield();
unsigned ticks_to_donate = min(ticks_left - 1, time_slice_for(*beneficiary));
#ifdef SCHEDULER_DEBUG
dbgprintf("%s(%u:%u) donating %u ticks to %s(%u:%u), reason=%s\n", current->process().name().characters(), current->pid(), current->tid(), ticks_to_donate, beneficiary->process().name().characters(), beneficiary->pid(), beneficiary->tid(), reason);
dbgprintf("%s(%u:%u) donating %u ticks to %s(%u:%u), reason=%s\n", Process::current->name().characters(), Process::current->pid(), Thread::current->tid(), ticks_to_donate, beneficiary->process().name().characters(), beneficiary->pid(), beneficiary->tid(), reason);
#endif
context_switch(*beneficiary);
beneficiary->set_ticks_left(ticks_to_donate);
@ -459,7 +458,7 @@ bool Scheduler::donate_to(Thread* beneficiary, const char* reason)
bool Scheduler::yield()
{
InterruptDisabler disabler;
ASSERT(current);
ASSERT(Thread::current);
if (!pick_next())
return false;
switch_now();
@ -475,10 +474,10 @@ void Scheduler::pick_next_and_switch_now()
void Scheduler::switch_now()
{
Descriptor& descriptor = get_gdt_entry(current->selector());
Descriptor& descriptor = get_gdt_entry(Thread::current->selector());
descriptor.type = 9;
asm("sti\n"
"ljmp *(%%eax)\n" ::"a"(&current->far_ptr()));
"ljmp *(%%eax)\n" ::"a"(&Thread::current->far_ptr()));
}
bool Scheduler::context_switch(Thread& thread)
@ -486,31 +485,33 @@ bool Scheduler::context_switch(Thread& thread)
thread.set_ticks_left(time_slice_for(thread));
thread.did_schedule();
if (current == &thread)
if (Thread::current == &thread)
return false;
if (current) {
if (Thread::current) {
// If the last process hasn't blocked (still marked as running),
// mark it as runnable for the next round.
if (current->state() == Thread::Running)
current->set_state(Thread::Runnable);
if (Thread::current->state() == Thread::Running)
Thread::current->set_state(Thread::Runnable);
asm volatile("fxsave %0"
: "=m"(current->fpu_state()));
: "=m"(Thread::current->fpu_state()));
#ifdef LOG_EVERY_CONTEXT_SWITCH
dbgprintf("Scheduler: %s(%u:%u) -> %s(%u:%u) [%u] %w:%x\n",
current->process().name().characters(), current->process().pid(), current->tid(),
Process::current->name().characters(), Process::current->pid(), Thread::current->tid(),
thread.process().name().characters(), thread.process().pid(), thread.tid(),
thread.priority(),
thread.tss().cs, thread.tss().eip);
#endif
}
current = &thread;
Thread::current = &thread;
Process::current = &thread.process();
thread.set_state(Thread::Running);
asm volatile("fxrstor %0" ::"m"(current->fpu_state()));
asm volatile("fxrstor %0" ::"m"(Thread::current->fpu_state()));
if (!thread.selector()) {
thread.set_selector(gdt_alloc_entry());
@ -555,7 +556,7 @@ void Scheduler::prepare_for_iret_to_new_process()
{
auto& descriptor = get_gdt_entry(s_redirection.selector);
descriptor.type = 9;
s_redirection.tss.backlink = current->selector();
s_redirection.tss.backlink = Thread::current->selector();
load_task_register(s_redirection.selector);
}
@ -564,7 +565,7 @@ void Scheduler::prepare_to_modify_tss(Thread& thread)
// This ensures that a currently running process modifying its own TSS
// in order to yield() and end up somewhere else doesn't just end up
// right after the yield().
if (current == &thread)
if (Thread::current == &thread)
load_task_register(s_redirection.selector);
}
@ -587,7 +588,7 @@ void Scheduler::initialize()
void Scheduler::timer_tick(RegisterState& regs)
{
if (!current)
if (!Thread::current)
return;
++g_uptime;
@ -597,12 +598,12 @@ void Scheduler::timer_tick(RegisterState& regs)
tv.tv_usec = PIT::ticks_this_second() * 1000;
Process::update_info_page_timestamp(tv);
if (current->process().is_profiling()) {
if (Process::current->is_profiling()) {
SmapDisabler disabler;
auto backtrace = current->raw_backtrace(regs.ebp);
auto backtrace = Thread::current->raw_backtrace(regs.ebp);
auto& sample = Profiling::next_sample_slot();
sample.pid = current->pid();
sample.tid = current->tid();
sample.pid = Process::current->pid();
sample.tid = Thread::current->tid();
sample.timestamp = g_uptime;
for (size_t i = 0; i < min((size_t)backtrace.size(), Profiling::max_stack_frame_count); ++i) {
sample.frames[i] = backtrace[i];
@ -611,10 +612,10 @@ void Scheduler::timer_tick(RegisterState& regs)
TimerQueue::the().fire();
if (current->tick())
if (Thread::current->tick())
return;
auto& outgoing_tss = current->tss();
auto& outgoing_tss = Thread::current->tss();
if (!pick_next())
return;
@ -656,7 +657,7 @@ static bool s_should_stop_idling = false;
void Scheduler::stop_idling()
{
if (current != g_colonel)
if (Thread::current != g_colonel)
return;
s_should_stop_idling = true;