diff --git a/winsup/cygserver/ChangeLog b/winsup/cygserver/ChangeLog
index a23bb541f..6de3a94ba 100644
--- a/winsup/cygserver/ChangeLog
+++ b/winsup/cygserver/ChangeLog
@@ -1,3 +1,7 @@
+2004-08-24  Corinna Vinschen  <corinna@vinschen.de>
+
+	* bsd_mutex.cc (_msleep): Release process object while waiting.
+
 2004-08-03  Corinna Vinschen  <corinna@vinschen.de>
 
 	* transport.cc (transport_layer_base::~transport_layer_base): Resurrect.
diff --git a/winsup/cygserver/bsd_mutex.cc b/winsup/cygserver/bsd_mutex.cc
index 449e61449..37e15e2e9 100644
--- a/winsup/cygserver/bsd_mutex.cc
+++ b/winsup/cygserver/bsd_mutex.cc
@@ -201,6 +201,7 @@ _msleep (void *ident, struct mtx *mtx, int priority,
   if ((priority & PCATCH)
       && td->client->signal_arrived () != INVALID_HANDLE_VALUE)
     obj_cnt = 4;
+  td->client->release ();
   switch (WaitForMultipleObjects (obj_cnt, obj, FALSE, timo ?: INFINITE))
     {
       case WAIT_OBJECT_0:	/* wakeup() has been called. */
@@ -225,6 +226,7 @@ _msleep (void *ident, struct mtx *mtx, int priority,
   /* Dismiss event before entering mutex. */
   ResetEvent (evt);
   CloseHandle (evt);
+  td->client->hold ();
   set_priority (old_priority);
   if (mtx && !(priority & PDROP))
     mtx_lock (mtx);