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Kernel: Introduce ThreadBlocker as a way to make unblocking neater :)

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And port all the descriptor-based blocks over to it as a proof of concept.
This commit is contained in:
Robin Burchell 2019-07-18 16:22:26 +02:00 • committed by Andreas Kling
parent a27c9e3e01
commit 0c8813e6d9
6 changed files with 154 additions and 67 deletions
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64
Kernel/Thread.h
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@ -67,17 +67,66 @@ public:
BlockedLurking,
BlockedSleep,
BlockedWait,
BlockedRead,
BlockedWrite,
BlockedSignal,
BlockedSelect,
BlockedConnect,
BlockedReceive,
BlockedAccept,
BlockedCondition,
__End_Blocked_States__
};
class ThreadBlocker {
public:
virtual ~ThreadBlocker() {}
virtual bool should_unblock(time_t now_s, long us) = 0;
};
class ThreadBlockerFileDescription : public ThreadBlocker {
public:
ThreadBlockerFileDescription(const RefPtr<FileDescription>& description);
RefPtr<FileDescription> blocked_description() const;
private:
RefPtr<FileDescription> m_blocked_description;
};
class ThreadBlockerAccept : public ThreadBlockerFileDescription {
public:
ThreadBlockerAccept(const RefPtr<FileDescription>& description);
virtual bool should_unblock(time_t, long) override;
};
class ThreadBlockerReceive : public ThreadBlockerFileDescription {
public:
ThreadBlockerReceive(const RefPtr<FileDescription>& description);
virtual bool should_unblock(time_t, long) override;
};
class ThreadBlockerConnect : public ThreadBlockerFileDescription {
public:
ThreadBlockerConnect(const RefPtr<FileDescription>& description);
virtual bool should_unblock(time_t, long) override;
};
class ThreadBlockerWrite : public ThreadBlockerFileDescription {
public:
ThreadBlockerWrite(const RefPtr<FileDescription>& description);
virtual bool should_unblock(time_t, long) override;
};
class ThreadBlockerRead : public ThreadBlockerFileDescription {
public:
ThreadBlockerRead(const RefPtr<FileDescription>& description);
virtual bool should_unblock(time_t, long) override;
};
class ThreadBlockerCondition : public ThreadBlocker {
public:
ThreadBlockerCondition(Function<bool()> &condition);
virtual bool should_unblock(time_t, long) override;
private:
Function<bool()> m_block_until_condition;
};
void did_schedule() { ++m_times_scheduled; }
u32 times_scheduled() const { return m_times_scheduled; }
@ -99,7 +148,7 @@ public:
void sleep(u32 ticks);
void block(Thread::State);
void block(Thread::State, FileDescription&);
void block(ThreadBlocker& blocker);
void unblock();
void set_wakeup_time(u64 t) { m_wakeup_time = t; }
@ -186,11 +235,10 @@ private:
RefPtr<Region> m_kernel_stack_for_signal_handler_region;
pid_t m_waitee_pid { -1 };
int m_wait_options { 0 };
RefPtr<FileDescription> m_blocked_description;
timeval m_select_timeout;
SignalActionData m_signal_action_data[32];
Region* m_signal_stack_user_region { nullptr };
Function<bool()> m_block_until_condition;
OwnPtr<ThreadBlocker> m_blocker;
Vector<int> m_select_read_fds;
Vector<int> m_select_write_fds;
Vector<int> m_select_exceptional_fds;