Wake up the message thread when pending signals have been unblocked

(code grabbed from glibc)

* libpthread/sysdeps/mach/hurd/pt-sigstate.c: Include <hurd/msg.h>
(__pthread_sigstate): Use _hurd_sigstate_lock/unlock instead of
__pthread_spin_lock on `ss->lock'.  Check _hurd_sigstate_pending and
send a message to the signal thread if needed.

1 files changed, 10 insertions, 2 deletions

diff --git a/sysdeps/mach/hurd/pt-sigstate.c b/sysdeps/mach/hurd/pt-sigstate.c
index 68c79c5..2af3e39 100644
--- a/sysdeps/mach/hurd/pt-sigstate.c
+++ b/sysdeps/mach/hurd/pt-sigstate.c
@@ -21,6 +21,7 @@
 #include <assert.h>
 #include <signal.h>
 #include <hurd/signal.h>
+#include <hurd/msg.h>
 
 #include <pt-internal.h>
 
@@ -31,11 +32,12 @@ __pthread_sigstate (struct __pthread *thread, int how,
 {
   error_t err = 0;
   struct hurd_sigstate *ss;
+  sigset_t pending;
 
   ss = _hurd_thread_sigstate (thread->kernel_thread);
   assert (ss);
 
-  __pthread_spin_lock (&ss->lock);
+  _hurd_sigstate_lock (ss);
 
   if (oset)
     *oset = ss->blocked;
@@ -63,7 +65,13 @@ __pthread_sigstate (struct __pthread *thread, int how,
   if (! err && clear_pending)
     __sigemptyset (&ss->pending);
 
-  __pthread_spin_unlock (&ss->lock);
+  pending = _hurd_sigstate_pending (ss) & ~ss->blocked;
+  _hurd_sigstate_unlock (ss);
+
+  if (! err && pending)
+    /* Send a message to the signal thread so it
+       will wake up and check for pending signals.  */
+    __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
 
   return err;
 }