This is a follow up to d015384e1d98fe77fd59339044f58efb1ab9fb25 "Fixed
ThreadPool (and dependent ORequestThread) life cycle" that still had some
problems:
* First, if Bridge::terminate was first entered from the reader or writer
thread, it would not join on that thread, so that thread could still be running
during exit.
That has been addressed by giving Bridge::dispose new semantics: It waits until
both Bridge::terminate has completed (even if that was called from a different
thread) and all spawned threads (reader, writer, ORequestThread workers) have
been joined. (This implies that Bridge::dispose must not be called from such a
thread, to avoid deadlock.)
* Second, if Bridge::terminate was first entered from an ORequestThread, the
call to uno_threadpool_dispose(0) to join on all such worker threads could
deadlock.
That has been addressed by making the last call to uno_threadpool_destroy wait
to join on all worker threads, and by calling uno_threadpool_destroy only from
the final Bridge::terminate (from Bridge::dispose), to avoid deadlock. (The
special semantics of uno_threadpool_dispose(0) are no longer needed and have
been removed, as they conflicted with the fix for the third problem below.)
* Third, once uno_threadpool_destroy had called uno_threadpool_dispose(0), the
ThreadAdmin singleton had been disposed, so no new remote bridges could
successfully be created afterwards.
That has been addressed by making ThreadAdmin a member of ThreadPool, and making
(only) those uno_ThreadPool handles with overlapping life spans share one
ThreadPool instance (which thus is no longer a singleton, either).
Additionally, ORequestThread has been made more robust (in the style of
salhelper::Thread) to avoid races.
Change-Id: I2cbd1b3f9aecc1bf4649e482d2c22b33b471788f
At least with sw_complex test under load, it happened that an ORequestThread
could still process a remote release request while the main thread was already
in exit(3). This was because (a) ThreadPool never joined with the spawned
worker threads (which has been rectified by calling uno_threadpool_dispose(0)
from the final uno_threadpool_destroy), and (b) binaryurp::Bridge called
uno_threadpool_destroy only from its destructor (which could go as late as
exit(3)) instead of from terminate.
Additional clean up:
* Access to Bridge's threadPool_ is now cleanly controlled by mutex_ (even
though that might not be necessary in every case).
* ThreadPool's stopDisposing got renamed to destroy, to make meaning clearer.
Change-Id: I45fa76e80e790a11065e7bf8ac9d92af2e62f262
2006/03/22 10:14:07 sb 1.2.38.1: #i63397# Keep objects alive long enough so that threads still running while atexit handlers are processed do not access dead objects.
