o Don't add a scope system thread's KSE to the list of available

  KSEs when it's thread exits; allow the GC handler to do that.

o Make spinlock/spinlock critical regions.

The following were submitted by davidxu

  o Alow thr_switch() to take a null mailbox argument.

  o Better protect cancellation checks.

  o Don't set KSE specific data when creating new KSEs; rely on the
    first upcall of the KSE to set it.

  o Add the ability to set the maximum concurrency level and do this
    automatically.  We should have a way to enable/disable this with
    some sort of tunable because some applications may not want this
    to be the default.

  o Hold the scheduling lock across thread switch calls.

  o If scheduling of a thread fails, make sure to remove it from the list
    of active threads.

  o Better protect accesses to a joining threads when the target thread is
    exited and detached.

  o Remove some macro definitions that are now provided by <sys/kse.h>.

  o Don't leave the library in threaded mode if creation of the initial
    KSE fails.

  o Wakeup idle KSEs when there are threads ready to run.

  o Maintain the number of threads active in the priority queue.

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/libpthread/thread/thr_exit.c b/lib/libpthread/thread/thr_exit.c
index 4a82b12..8435f43 100644
--- a/lib/libpthread/thread/thr_exit.c
+++ b/lib/libpthread/thread/thr_exit.c
@@ -104,7 +104,9 @@ _pthread_exit(void *status)
 	 * Flag this thread as exiting.  Threads should now be prevented
 	 * from joining to this thread.
 	 */
+	THR_SCHED_LOCK(curthread, curthread);
 	curthread->flags |= THR_FLAGS_EXITING;
+	THR_SCHED_UNLOCK(curthread, curthread);
 
 	/* Save the return value: */
 	curthread->ret = status;
@@ -121,10 +123,11 @@ _pthread_exit(void *status)
 	}
 
 	/* This thread will never be re-scheduled. */
-	THR_SCHED_LOCK(curthread, curthread);
+	THR_LOCK_SWITCH(curthread);
 	THR_SET_STATE(curthread, PS_DEAD);
-	THR_SCHED_UNLOCK(curthread, curthread);
 	_thr_sched_switch(curthread);
+	/* Never reach! */
+	THR_UNLOCK_SWITCH(curthread);
 
 	/* This point should not be reached. */
 	PANIC("Dead thread has resumed");