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717cd5015e
This allows a process wich has more than 1 thread to call exec, even from a thread. This kills all the other threads, but it won't wait for them to finish, just makes sure that they are not in a running/runable state. In the case where a thread does exec, the new program PID will be the thread TID, to keep the PID == TID in the new process. This introduces a new function inside the Process class, kill_threads_except_self which is called on exit() too (exit with multiple threads wasn't properly working either). Inside the Lock class, there is the need for a new function, clear_waiters, which removes all the waiters from the Process::big_lock. This is needed since after a exit/exec, there should be no other threads waiting for this lock, the threads should be simply killed. Only queued threads should wait for this lock at this point, since blocked threads are handled in set_should_die.
102 lines
2.8 KiB
C++
102 lines
2.8 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/Atomic.h>
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#include <AK/Types.h>
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#include <Kernel/Arch/i386/CPU.h>
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#include <Kernel/Forward.h>
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#include <Kernel/WaitQueue.h>
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namespace Kernel {
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class Lock {
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public:
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Lock(const char* name = nullptr)
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: m_name(name)
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{
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}
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~Lock() {}
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void lock();
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void unlock();
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bool force_unlock_if_locked();
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bool is_locked() const { return m_holder; }
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void clear_waiters();
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const char* name() const { return m_name; }
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private:
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Atomic<bool> m_lock { false };
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u32 m_level { 0 };
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Thread* m_holder { nullptr };
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const char* m_name { nullptr };
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WaitQueue m_queue;
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};
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class Locker {
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public:
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[[gnu::always_inline]] inline explicit Locker(Lock& l)
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: m_lock(l)
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{
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lock();
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}
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[[gnu::always_inline]] inline ~Locker() { unlock(); }
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[[gnu::always_inline]] inline void unlock() { m_lock.unlock(); }
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[[gnu::always_inline]] inline void lock() { m_lock.lock(); }
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private:
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Lock& m_lock;
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};
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#define LOCKER(lock) Locker locker(lock)
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template<typename T>
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class Lockable {
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public:
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Lockable() {}
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Lockable(T&& resource)
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: m_resource(move(resource))
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{
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}
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Lock& lock() { return m_lock; }
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T& resource() { return m_resource; }
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T lock_and_copy()
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{
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LOCKER(m_lock);
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return m_resource;
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}
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private:
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T m_resource;
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Lock m_lock;
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};
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}
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