spinlock_nt.hpp added, Cygwin fixes.

[SVN r44055]

include/boost/detail/spinlock.hpp

@@ -32,10 +32,12 @@
 
 #if defined(__GNUC__) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
 #  include <boost/detail/spinlock_sync.hpp>
-#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
+#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
 #  include <boost/detail/spinlock_w32.hpp>
 #elif defined(BOOST_HAS_PTHREADS)
 #  include <boost/detail/spinlock_pt.hpp>
+#elif !defined(BOOST_HAS_THREADS)
+#  include <boost/detail/spinlock_nt.hpp>
 #else
 #  error Unrecognized threading platform
 #endif

include/boost/detail/spinlock_nt.hpp

@@ -0,0 +1,67 @@
+#ifndef BOOST_DETAIL_SPINLOCK_NT_HPP_INCLUDED
+#define BOOST_DETAIL_SPINLOCK_NT_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  Copyright (c) 2008 Peter Dimov
+//
+//  Distributed under the Boost Software License, Version 1.0.
+//  See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+
+namespace boost
+{
+
+namespace detail
+{
+
+class spinlock
+{
+public:
+
+    inline bool try_lock()
+    {
+        return true;
+    }
+
+    inline void lock()
+    {
+    }
+
+    inline void unlock()
+    {
+    }
+
+public:
+
+    class scoped_lock
+    {
+    private:
+
+        scoped_lock( scoped_lock const & );
+        scoped_lock & operator=( scoped_lock const & );
+
+    public:
+
+        explicit scoped_lock( spinlock & /*sp*/ )
+        {
+        }
+
+        ~scoped_lock()
+        {
+        }
+    };
+};
+
+} // namespace detail
+} // namespace boost
+
+#define BOOST_DETAIL_SPINLOCK_INIT {}
+
+#endif // #ifndef BOOST_DETAIL_SPINLOCK_NT_HPP_INCLUDED

include/boost/detail/yield_k.hpp

@@ -25,7 +25,7 @@
 
 #include <boost/config.hpp>
 
-#if defined( WIN32 ) || defined( _WIN32 ) || defined( __WIN32__ )
+#if defined( WIN32 ) || defined( _WIN32 ) || defined( __WIN32__ ) || defined( __CYGWIN__ )
 
 #if defined( BOOST_USE_WINDOWS_H )
 # include <windows.h>
@@ -33,6 +33,7 @@
 
 #if defined(_MSC_VER) && _MSC_VER >= 1310
   extern "C" void _mm_pause();
+# pragma intrinsic( _mm_pause )
 #endif
 
 namespace boost