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Kernel+LibPthread: Implement pthread_join()

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It's now possible to block until another thread in the same process has
exited. We can also retrieve its exit value, which is whatever value it
passed to pthread_exit(). :^)
This commit is contained in:
Andreas Kling 2019-11-14 20:58:23 +01:00
parent c6a8b95643
commit 69efa3f630
9 changed files with 117 additions and 5 deletions
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17
Kernel/Thread.h
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@ -95,6 +95,16 @@ public:
friend class Thread;
};
class JoinBlocker final : public Blocker {
public:
explicit JoinBlocker(Thread& joinee);
virtual bool should_unblock(Thread&, time_t now_s, long us) override;
virtual const char* state_string() const override { return "Joining"; }
private:
Thread& m_joinee;
};
class FileDescriptionBlocker : public Blocker {
public:
const FileDescription& blocked_description() const;
@ -356,6 +366,13 @@ private:
VirtualAddress m_thread_specific_data;
SignalActionData m_signal_action_data[32];
Blocker* m_blocker { nullptr };
// FIXME: Some of these could probably live in the JoinBlocker object instead.
Thread* m_joiner { nullptr };
Thread* m_joinee { nullptr };
void* m_joinee_exit_value { nullptr };
void* m_exit_value { nullptr };
FPUState* m_fpu_state { nullptr };
State m_state { Invalid };
ThreadPriority m_priority { ThreadPriority::Normal };