* exceptions.cc (interruptible): Change method for determining if something is

interruptible.
(call_handler): Avoid suspending a thread if it owns a mutex.  Only set
signal_arrived if the thread was actually interrupted.
(events_init): Initialize module information needed by interruptible().
(sigdelayed): Don't call sig_dispatch_pending since it could screw up
* init.cc (dll_entry): Record module handle of main for use by interruptible().
(proc_subproc): Reorganize handling of terminated child so that the bulk of the
processing comes from the signal thread.
(wait_sig): Force processing of waiting threads if SIGCHLD is not processed.
* sync.cc (muto::release): Set tid == 0 after lock is released or signal
processor will be confused.

winsup/cygwin/sync.h

@@ -1,6 +1,6 @@
 /* sync.h: Header file for cygwin synchronization primitives.
 
-   Copyright 1999 Cygnus Solutions.
+   Copyright 1999, 2000 Cygnus Solutions.
 
    Written by Christopher Faylor <cgf@cygnus.com>
 
@@ -36,6 +36,7 @@ public:
 
   /* Return true if caller thread owns the lock. */
   int ismine () {return tid == GetCurrentThreadId ();}
+  DWORD owner () {return tid;}
 };
 
 /* Use a statically allocated buffer as the storage for a muto */