* exceptions.cc (set_process_mask): Set pending signals only when signals

become unmasked.
* sigproc.cc (pending_signals): Flip back to a global.
(wait_sig): Don't set pending signals when there is an armed semaphore or
signal is blocked.
* shared.cc (shared_info::initialize): Add a username parameter for user-mode
mounts.  Reorganize to try to avoid startup race.
(memory_init): Move some stuff into shared_info::initialize.
* shared_info.h (shared_info::initialize): Change declaration.
(CURR_SHARED_MAGIC): Update.

winsup/cygwin/shared_info.h

@@ -140,7 +140,7 @@ public:
 
 #define SHARED_INFO_CB 47112
 
-#define CURR_SHARED_MAGIC 0x359218a2U
+#define CURR_SHARED_MAGIC 0x53f1a7f4U
 
 /* NOTE: Do not make gratuitous changes to the names or organization of the
    below class.  The layout is checksummed to determine compatibility between
@@ -155,7 +155,7 @@ class shared_info
 
   tty_list tty;
   delqueue_list delqueue;
-  void initialize ();
+  void initialize (const char *);
   unsigned heap_chunk_size ();
 };