1 files changed, 136 insertions, 0 deletions
diff --git a/3rdParty/Boost/boost/thread/win32/once.hpp b/3rdParty/Boost/boost/thread/win32/once.hpp
new file mode 100644
index 0000000..a6fcc94
--- /dev/null
+++ b/3rdParty/Boost/boost/thread/win32/once.hpp
@@ -0,0 +1,136 @@
+#ifndef BOOST_THREAD_WIN32_ONCE_HPP
+#define BOOST_THREAD_WIN32_ONCE_HPP
+
+//  once.hpp
+//
+//  (C) Copyright 2005-7 Anthony Williams 
+//  (C) Copyright 2005 John Maddock
+//
+//  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)
+
+#include <cstring>
+#include <cstddef>
+#include <boost/assert.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/detail/interlocked.hpp>
+#include <boost/thread/win32/thread_primitives.hpp>
+#include <boost/thread/win32/interlocked_read.hpp>
+
+#include <boost/config/abi_prefix.hpp>
+
+#ifdef BOOST_NO_STDC_NAMESPACE
+namespace std
+{
+    using ::memcpy;
+    using ::ptrdiff_t;
+}
+#endif
+
+namespace boost
+{
+    typedef long once_flag;
+
+#define BOOST_ONCE_INIT 0
+
+    namespace detail
+    {
+        struct win32_mutex_scoped_lock
+        {
+            void* const mutex_handle;
+            explicit win32_mutex_scoped_lock(void* mutex_handle_):
+                mutex_handle(mutex_handle_)
+            {
+                BOOST_VERIFY(!win32::WaitForSingleObject(mutex_handle,win32::infinite));
+            }
+            ~win32_mutex_scoped_lock()
+            {
+                BOOST_VERIFY(win32::ReleaseMutex(mutex_handle)!=0);
+            }
+        private:
+            void operator=(win32_mutex_scoped_lock&);
+        };
+
+#ifdef BOOST_NO_ANSI_APIS
+        template <class I>
+        void int_to_string(I p, wchar_t* buf)
+        {
+            for(unsigned i=0; i < sizeof(I)*2; ++i,++buf)
+            {
+                *buf = L'A' + static_cast<wchar_t>((p >> (i*4)) & 0x0f);
+            }
+            *buf = 0;
+        }
+#else
+        template <class I>
+        void int_to_string(I p, char* buf)
+        {
+            for(unsigned i=0; i < sizeof(I)*2; ++i,++buf)
+            {
+                *buf = 'A' + static_cast<char>((p >> (i*4)) & 0x0f);
+            }
+            *buf = 0;
+        }
+#endif
+
+        // create a named mutex. It doesn't really matter what this name is
+        // as long as it is unique both to this process, and to the address of "flag":
+        inline void* create_once_mutex(void* flag_address)
+        {
+        
+#ifdef BOOST_NO_ANSI_APIS
+            typedef wchar_t char_type;
+            static const char_type fixed_mutex_name[]=L"{C15730E2-145C-4c5e-B005-3BC753F42475}-once-flag";
+#else
+            typedef char char_type;
+            static const char_type fixed_mutex_name[]="{C15730E2-145C-4c5e-B005-3BC753F42475}-once-flag";
+#endif
+            unsigned const once_mutex_name_fixed_buffer_size=sizeof(fixed_mutex_name)/sizeof(char_type);
+            unsigned const once_mutex_name_fixed_length=once_mutex_name_fixed_buffer_size-1;
+            unsigned const once_mutex_name_length=once_mutex_name_fixed_buffer_size+sizeof(void*)*2+sizeof(unsigned long)*2;
+            char_type mutex_name[once_mutex_name_length];
+            
+            std::memcpy(mutex_name,fixed_mutex_name,sizeof(fixed_mutex_name));
+
+            BOOST_STATIC_ASSERT(sizeof(void*) == sizeof(std::ptrdiff_t));
+            detail::int_to_string(reinterpret_cast<std::ptrdiff_t>(flag_address), mutex_name + once_mutex_name_fixed_length);
+            detail::int_to_string(win32::GetCurrentProcessId(), mutex_name + once_mutex_name_fixed_length + sizeof(void*)*2);
+
+#ifdef BOOST_NO_ANSI_APIS
+            return win32::CreateMutexW(0, 0, mutex_name);
+#else
+            return win32::CreateMutexA(0, 0, mutex_name);
+#endif
+        }
+
+        
+    }
+    
+
+    template<typename Function>
+    void call_once(once_flag& flag,Function f)
+    {
+        // Try for a quick win: if the procedure has already been called
+        // just skip through:
+        long const function_complete_flag_value=0xc15730e2;
+
+        if(::boost::detail::interlocked_read_acquire(&flag)!=function_complete_flag_value)
+        {
+            void* const mutex_handle(::boost::detail::create_once_mutex(&flag));
+            BOOST_ASSERT(mutex_handle);
+            detail::win32::handle_manager const closer(mutex_handle);
+            detail::win32_mutex_scoped_lock const lock(mutex_handle);
+      
+            if(flag!=function_complete_flag_value)
+            {
+                f();
+                BOOST_INTERLOCKED_EXCHANGE(&flag,function_complete_flag_value);
+            }
+        }
+    }
+}
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif