To support stack unwinding for cancellation points, add -fexceptions flag

for them, two functions _pthread_cancel_enter and _pthread_cancel_leave
are added to let thread enter and leave a cancellation point, it also
makes it possible that other functions can be cancellation points in
libraries without having to be rewritten in libthr.

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/libthr/thread/thr_cancel.c b/lib/libthr/thread/thr_cancel.c
index cd456b7..89f0ee1 100644
--- a/lib/libthr/thread/thr_cancel.c
+++ b/lib/libthr/thread/thr_cancel.c
@@ -162,3 +162,15 @@ _thr_cancel_leave(struct pthread *curthread, int maycancel)
 	    !THR_IN_CRITICAL(curthread) && maycancel))
 		_pthread_exit(PTHREAD_CANCELED);
 }
+
+void
+_pthread_cancel_enter(int maycancel)
+{
+	_thr_cancel_enter2(_get_curthread(), maycancel);
+}
+
+void
+_pthread_cancel_leave(int maycancel)
+{
+	_thr_cancel_leave(_get_curthread(), maycancel);
+}