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https://github.com/SerenityOS/serenity
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78f1b5e359
This changes the Thread::wait_on function to not enable interrupts upon leaving, which caused some problems with page fault handlers and in other situations. It may now be called from critical sections, with interrupts enabled or disabled, and returns to the same state. This also requires some fixes to Lock. To aid debugging, a new define LOCK_DEBUG is added that enables checking for Lock leaks upon finalization of a Thread.
84 lines
3 KiB
C++
84 lines
3 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/Function.h>
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#include <AK/IntrusiveList.h>
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#include <AK/Types.h>
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#include <Kernel/SpinLock.h>
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#include <Kernel/Time/TimeManagement.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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class Process;
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class Thread;
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class WaitQueue;
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struct RegisterState;
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struct SchedulerData;
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extern Thread* g_finalizer;
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extern WaitQueue* g_finalizer_wait_queue;
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extern Atomic<bool> g_finalizer_has_work;
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extern SchedulerData* g_scheduler_data;
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extern RecursiveSpinLock g_scheduler_lock;
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class Scheduler {
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public:
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static void initialize();
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static Thread* create_ap_idle_thread(u32 cpu);
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static void set_idle_thread(Thread* idle_thread);
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static void timer_tick(const RegisterState&);
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[[noreturn]] static void start();
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static bool pick_next();
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static bool yield();
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static void yield_from_critical();
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static bool donate_to_and_switch(Thread*, const char* reason);
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static bool donate_to(RefPtr<Thread>&, const char* reason);
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static bool context_switch(Thread*);
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static void enter_current(Thread& prev_thread);
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static void leave_on_first_switch(u32 flags);
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static void prepare_after_exec();
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static void prepare_for_idle_loop();
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static Process* colonel();
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static void beep();
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static void idle_loop(void*);
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static void invoke_async();
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static void notify_finalizer();
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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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};
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}
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