* exceptions.cc (interruptible): Make a little more structured.

(call_handler): Allow signals to be sent even if signalled thread is stopped.
Change order of signal_arrived arming/waiting threads clearing to eliminate a
race.
(reset_signal_arrived): New helper function.
* malloc.cc (malloc_init): Use mutos so that signal handler can keep track of
who owns the lock.
(__malloc_lock): Ditto.
(__malloc_unlock): Ditto.
* sync.h (new_muto): Actually use a muto for the "buffer".
* Makefile.in: Fix a dependency.

winsup/cygwin/sync.cc

@@ -20,11 +20,12 @@ details. */
 #include <errno.h>
 #include <stdlib.h>
 #include "winsup.h"
+#include "sync.h"
 
-muto muto_start (0, 0);
+muto NO_COPY muto_start;
 
 /* Constructor */
-muto::muto(int inh, const char *name) : sync (0), visits(0), waiters(-1), tid (0), next (0)
+muto::muto(int inh, const char *name) : sync (0), visits(0), waiters(-1), tid (0), next (NULL)
 {
   /* 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)))