* fork.cc (lock_signals): Move to sigproc.h.

(lock_pthread): Ditto.
(hold_everything): Ditto.
(frok::parent): Call myself.prefork() just before calling CreateProcess.  Call
myself.postfork () on function exit.
* pinfo.cc (pinfo::pending_rd_proc_pipe): Define.
(pinfo::pending_wr_proc_pipe): Ditto.
(_pinfo::dup_proc_pipe): Delete.
(pinfo::wait): Move pipe creation into pinfo::prefork.  Set pipe variables from
pending_*.
(_pinfo::sync_proc_pipe): Delete.
(_pinfo::proc_pipe_owner): Ditto.
(pinfo::prefork): Define new function.
(pinfo::postfork): Ditto.
(pinfo::postexec): Ditto.
(_pinfo::alert_parent): Remove obsolete call to sync_proc_pipe.
(_pinfo::dup_proc_pipe): Delete declaration.
(_pinfo::sync_proc_pipe): Ditto.
(pinfo::pending_rd_proc_pipe): Declare.
(pinfo::pending_wr_proc_pipe): Ditto.
(pinfo::prefork): Declare new function.
(pinfo::postfork): Ditto.
(pinfo::postexec): Ditto.
(pinfo::wr_proc_pipe): Define new wrapper function.
* sigproc.h: Include "sync.h".  Move locking functions from fork to here.
* spawn.cc (child_info_spawn::worker): Delete now-unneeded requirement to
record orig_wr_proc_pipe.  Call hold_everything prior to doing anything.  Call
myself.prefork() if spawning.  Replace wr_proc_pipe synchronization with call
to myself.postexec().  Call myself.postfork() if not execing.
* sync.h: Replace #ifdef wrapper with "#pragma once".

winsup/cygwin/sync.h

@@ -1,6 +1,7 @@
 /* sync.h: Header file for cygwin synchronization primitives.
 
-   Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Red Hat, Inc.
+   Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2011, 2012
+   Red Hat, Inc.
 
 This file is part of Cygwin.
 
@@ -8,8 +9,8 @@ This software is a copyrighted work licensed under the terms of the
 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
-#ifndef _SYNC_H
-#define _SYNC_H
+#pragma once
+
 /* FIXME: Note that currently this class cannot be allocated via `new' since
    there are issues with malloc and fork. */
 class muto
@@ -62,5 +63,3 @@ public:
   friend class dtable;
   friend class fhandler_fifo;
 };
-
-#endif /*_SYNC_H*/