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Thread: Return a result from block() indicating why the block terminated

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And use this to return EINTR in various places; some of which we were
not handling properly before.

This might expose a few bugs in userspace, but should be more compatible
with other POSIX systems, and is certainly a little cleaner.
This commit is contained in:
Robin Burchell 2019-07-20 11:05:52 +02:00 • committed by Andreas Kling
parent 56217c7432
commit 833d444cd8
9 changed files with 73 additions and 38 deletions
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22
Kernel/Thread.h
View file

@ -68,6 +68,10 @@ public:
virtual ~Blocker() {}
virtual bool should_unblock(Thread&, time_t now_s, long us) = 0;
virtual const char* state_string() const = 0;
void set_interrupted_by_signal() { m_was_interrupted_while_blocked = true; }
bool was_interrupted_by_signal() const { return m_was_interrupted_while_blocked; }
private:
bool m_was_interrupted_while_blocked { false };
};
class FileDescriptionBlocker : public Blocker {
@ -205,17 +209,30 @@ public:
u64 sleep(u32 ticks);
enum class BlockResult {
WokeNormally,
InterruptedBySignal,
};
template <typename T, class... Args>
void block(Args&& ... args)
[[nodiscard]] BlockResult block(Args&& ... args)
{
ASSERT(!m_blocker);
T t(AK::forward<Args>(args)...);
m_blocker = &t;
block_helper();
if (t.was_interrupted_by_signal())
return BlockResult::InterruptedBySignal;
return BlockResult::WokeNormally;
};
[[nodiscard]] BlockResult block_until(const char* state_string, Function<bool()>&& condition)
{
return block<ConditionBlocker>(state_string, move(condition));
}
void unblock();
void block_until(const char* state_string, Function<bool()>&&);
KResult wait_for_connect(FileDescription&);
const FarPtr& far_ptr() const { return m_far_ptr; }
@ -301,7 +318,6 @@ private:
FPUState* m_fpu_state { nullptr };
State m_state { Invalid };
bool m_has_used_fpu { false };
bool m_was_interrupted_while_blocked { false };
void block_helper();
};