* child_info.h (_CI_SAW_CTRL_C): New enum.

(CURR_CHILD_INFO_MAGIC): Reset.
(saw_ctrl_c): New function.
(set_saw_ctrl_c): Ditto.
* sigproc.cc (child_info::proc_retry): Return EXITCODE_OK if we get
STATUS_CONTROL_C_EXIT and we actually saw a CTRL-C.
* spawn.cc (dwExeced): Delete.
(chExeced): New variable.
(spawn_guts): Set chExeced;
* exceptions.cc (dwExeced): Delete declaration.
(chExeced): Declare.
(ctrl_c_handler): Detect if we're an exec stub process and set a flag, if so.
* fhandler_tty.cc (fhandler_tty_common::__release_output_mutex): Add extra
DEBUGGING test.
* pinfo.cc: Fix comment.

winsup/cygwin/fhandler_tty.cc

@@ -148,6 +148,13 @@ fhandler_tty_common::__release_output_mutex (const char *fn, int ln)
       ostack[osi].ln = -ln;
 #endif
     }
+#ifdef DEBUGGING
+  else if (osi > 0)
+    {
+      system_printf ("couldn't release output mutex but we seem to own it, %E");
+      try_to_debug ();
+    }
+#endif
 }
 
 /* Process tty input. */