Use a generic way to back threads out of wait queues when handling

signals instead of having more intricate knowledge of thread state
within signal handling.

Simplify signal code because of above (by David Xu).

Use macros for libpthread usage of pthread_cleanup_push() and
pthread_cleanup_pop().  This removes some instances of malloc()
and free() from the semaphore and pthread_once() implementations.

When single threaded and forking(), make sure that the current
thread's signal mask is inherited by the forked thread.

Use private mutexes for libc and libpthread.  Signals are
deferred while threads hold private mutexes.  This fix also
breaks www/linuxpluginwrapper; a patch that fixes it is at
http://people.freebsd.org/~deischen/kse/linuxpluginwrapper.diff

Fix race condition in condition variables where handling a
signal (pthread_kill() or kill()) may not see a wakeup
(pthread_cond_signal() or pthread_cond_broadcast()).

In collaboration with:	davidxu

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/libpthread/thread/thr_concurrency.c b/lib/libpthread/thread/thr_concurrency.c
index 59e8550..daea56c 100644
--- a/lib/libpthread/thread/thr_concurrency.c
+++ b/lib/libpthread/thread/thr_concurrency.c
@@ -84,6 +84,13 @@ _thr_setconcurrency(int new_level)
 	int i;
 	int ret;
 
+	/*
+	 * Turn on threaded mode, if failed, it is unnecessary to
+	 * do further work.
+	 */
+	if (_kse_isthreaded() == 0 && _kse_setthreaded(1))
+		return (EAGAIN);
+
 	ret = 0;
 	curthread = _get_curthread();
 	/* Race condition, but so what. */