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Kernel: Refactor thread scheduling a bit, breaking it into multiple lists.

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There are now two thread lists, one for runnable threads and one for non-
runnable threads. Thread::set_state() is responsible for moving threads
between the lists.

Each thread also has a back-pointer to the list it's currently in.
This commit is contained in:
Andreas Kling 2019-05-18 18:31:36 +02:00
parent 99dd60611f
commit 8c7d5abdc4
4 changed files with 104 additions and 25 deletions
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12
Kernel/Scheduler.cpp
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@ -72,7 +72,7 @@ bool Scheduler::pick_next()
auto now_usec = now.tv_usec;
// Check and unblock threads whose wait conditions have been met.
Thread::for_each([&] (Thread& thread) {
Thread::for_each_nonrunnable([&] (Thread& thread) {
auto& process = thread.process();
if (thread.state() == Thread::BlockedSleep) {
@ -223,8 +223,8 @@ bool Scheduler::pick_next()
});
#ifdef SCHEDULER_DEBUG
dbgprintf("Scheduler choices:\n");
for (auto* thread = g_threads->head(); thread; thread = thread->next()) {
dbgprintf("Scheduler choices: (runnable threads: %p)\n", g_runnable_threads);
for (auto* thread = g_runnable_threads->head(); thread; thread = thread->next()) {
//if (process->state() == Thread::BlockedWait || process->state() == Thread::BlockedSleep)
// continue;
auto* process = &thread->process();
@ -232,11 +232,11 @@ bool Scheduler::pick_next()
}
#endif
auto* previous_head = g_threads->head();
auto* previous_head = g_runnable_threads->head();
for (;;) {
// Move head to tail.
g_threads->append(g_threads->remove_head());
auto* thread = g_threads->head();
g_runnable_threads->append(g_runnable_threads->remove_head());
auto* thread = g_runnable_threads->head();
if (!thread->process().is_being_inspected() && (thread->state() == Thread::Runnable || thread->state() == Thread::Running)) {
#ifdef SCHEDULER_DEBUG