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934b1d8a9b
Before putting itself back on the wait queue, the finalizer task will now check if there's more work to do, and if so, do it first. :^) This patch also puts a bunch of process/thread debug logging behind PROCESS_DEBUG and THREAD_DEBUG since it was unbearable to debug this stuff with all the spam.
77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Types.h>
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#include <AK/Function.h>
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#include <AK/IntrusiveList.h>
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class Process;
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class Thread;
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class WaitQueue;
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struct RegisterDump;
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struct SchedulerData;
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extern Thread* current;
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extern Thread* g_finalizer;
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extern Thread* g_colonel;
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extern WaitQueue* g_finalizer_wait_queue;
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extern bool g_finalizer_has_work;
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extern u64 g_uptime;
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extern SchedulerData* g_scheduler_data;
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class Scheduler {
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public:
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static void initialize();
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static void timer_tick(RegisterDump&);
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static bool pick_next();
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static void pick_next_and_switch_now();
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static void switch_now();
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static bool yield();
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static bool donate_to(Thread*, const char* reason);
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static bool context_switch(Thread&);
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static void prepare_to_modify_tss(Thread&);
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static Process* colonel();
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static bool is_active();
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static void beep();
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static void idle_loop();
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static void stop_idling();
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template<typename Callback>
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static inline IterationDecision for_each_runnable(Callback);
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template<typename Callback>
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static inline IterationDecision for_each_nonrunnable(Callback);
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static void init_thread(Thread& thread);
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static void update_state_for_thread(Thread& thread);
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private:
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static void prepare_for_iret_to_new_process();
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};
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