* exceptions.cc (unused_sig_wrapper): Eliminate unused parameter to asm.

* external.cc (cygwin_internal): Change CW_STRACE_ON to CW_STRACE_TOGGLE.
* strace.cc (strace::hello): Toggle strace on and off.
* sync.cc (muto::init): Renamed from constructor.
* sync.h (muto::new): Delete.
(muto::delete): Ditto.
(new_muto): Simplify.  Use muto.init for nearly everything.
* uinfo.cc (uinfo_init): Avoid closing a NULL handle.
* include/sys/cygwin.h (cygwin_getinfo_types): Rename CW_STRACE_OFF to
CW_STRACE_TOGGLE.  Delete CW_STRACE_OFF.
* include/sys/strace.h (strace): Add "inited" field.

winsup/cygwin/sync.cc

@@ -28,18 +28,24 @@ muto NO_COPY muto_start;
 #undef WaitForSingleObject
 
 /* Constructor */
-muto::muto (int inh, const char *s) : sync (0), visits(0), waiters(-1), tid (0), next (NULL)
+muto *
+muto::init (int inh, const char *s)
 {
+  waiters = -1;
   /* Create event which is used in the fallback case when blocking is necessary */
-  if (!(bruteforce = CreateEvent (inh ? &sec_all_nih : &sec_none_nih, FALSE, FALSE, name)))
+  if (!(bruteforce = CreateEvent (inh ? &sec_all_nih : &sec_none_nih, FALSE, FALSE, NULL)))
     {
       DWORD oerr = GetLastError ();
       SetLastError (oerr);
-      return;
+      return NULL;
     }
   name = s;
+  next = muto_start.next;
+  muto_start.next = this;
+  return this;
 }
 
+#if 0 /* FIXME: Do we need this? mutos aren't destroyed until process exit */
 /* Destructor (racy?) */
 muto::~muto ()
 {
@@ -52,6 +58,7 @@ muto::~muto ()
   if (h)
     CloseHandle (h);
 }
+#endif
 
 /* Acquire the lock.  Argument is the number of milliseconds to wait for
    the lock.  Multiple visits from the same thread are allowed and should