kleines Filmröllchen bfb3fc58dd Kernel: Allow dead threads to be joined ...

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.

2022-12-11 19:07:20 -07:00

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