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Kernel: Allow dead threads to be joined

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Joining dead threads is allowed for two main reasons:
- Thread join behavior should not be racy when a thread is joined and
  exiting at roughly the same time. This is common behavior when threads
  are given a signal to end (meaning they are going to exit ASAP) and
  then joined.
- POSIX requires that exited threads are joinable (at least, there is no
  language in the specification forbidding it).

The behavior is still well-defined; e.g. it doesn't allow a dead
detached thread to be joined or a thread to be joined more than once.
This commit is contained in:
kleines Filmröllchen 2022-11-10 20:59:39 +01:00 committed by Andrew Kaster
parent 8997d825d5
commit bfb3fc58dd
Notes: sideshowbarker 2024-07-17 03:24:40 +09:00 
Author: https://github.com/kleinesfilmroellchen
Commit: https://github.com/SerenityOS/serenity/commit/bfb3fc58dd
Pull-request: https://github.com/SerenityOS/serenity/pull/16011
Reviewed-by: https://github.com/ADKaster ✅
1 changed files with 6 additions and 1 deletions
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7
Kernel/Thread.h
View file

@ -824,7 +824,12 @@ public:
return EDEADLK;
SpinlockLocker lock(m_lock);
if (!m_is_joinable || state() == Thread::State::Dead)
// Joining dead threads is allowed for two main reasons:
// - Thread join behavior should not be racy when a thread is joined and exiting at roughly the same time.
// This is common behavior when threads are given a signal to end (meaning they are going to exit ASAP) and then joined.
// - POSIX requires that exited threads are joinable (at least, there is no language in the specification forbidding it).
if (!m_is_joinable || state() == Thread::State::Invalid)
return EINVAL;
add_blocker();