RFR: 8350667: Remove startThread_lock() and _startThread_lock on AIX

[David Holmes]

On Tue, 25 Feb 2025 15:58:36 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The startThread_lock() and _startThread_lock coding is not used on AIX so it can be removed.

src/hotspot/os/aix/os_aix.cpp line 800:

> 798: 
> 799:   // child thread synchronization is not done here on AIX, a thread is started in suspended state
> 800: 

It is interesting that on Windows, where we also start threads suspended, we also do:

// Thread state now is INITIALIZED, not SUSPENDED
  osthread->set_state(INITIALIZED);

then we have:

  // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
  return true;

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/23779#discussion_r1970891998