Started to merge @ZobyTwo cmake branch

thirdparty/Boost/lib/pthread/once.cpp

@@ -0,0 +1,51 @@
+// Copyright (C) 2007 Anthony Williams
+//
+//  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)
+
+#define __STDC_CONSTANT_MACROS
+#include <boost/thread/once.hpp>
+#include <boost/assert.hpp>
+#include <pthread.h>
+#include <stdlib.h>
+
+namespace boost
+{
+    namespace detail
+    {
+        BOOST_THREAD_DECL boost::uintmax_t once_global_epoch=UINTMAX_C(~0);
+        BOOST_THREAD_DECL pthread_mutex_t once_epoch_mutex=PTHREAD_MUTEX_INITIALIZER;
+        BOOST_THREAD_DECL pthread_cond_t once_epoch_cv = PTHREAD_COND_INITIALIZER;
+
+        namespace
+        {
+            pthread_key_t epoch_tss_key;
+            pthread_once_t epoch_tss_key_flag=PTHREAD_ONCE_INIT;
+            
+            extern "C" void delete_epoch_tss_data(void* data)
+            {
+                free(data);
+            }
+
+            extern "C" void create_epoch_tss_key()
+            {
+                BOOST_VERIFY(!pthread_key_create(&epoch_tss_key,delete_epoch_tss_data));
+            }
+            
+        }
+        
+        boost::uintmax_t& get_once_per_thread_epoch()
+        {
+            BOOST_VERIFY(!pthread_once(&epoch_tss_key_flag,create_epoch_tss_key));
+            void* data=pthread_getspecific(epoch_tss_key);
+            if(!data)
+            {
+                data=malloc(sizeof(boost::uintmax_t));
+                BOOST_VERIFY(!pthread_setspecific(epoch_tss_key,data));
+                *static_cast<boost::uintmax_t*>(data)=UINTMAX_C(~0);
+            }
+            return *static_cast<boost::uintmax_t*>(data);
+        }
+    }
+    
+}