9aaeb47e   
   From: pete@versatilecoding.com   
      
   On 2012-02-14 10:38:38 +0000, Hei said:   
      
   > Hi,   
   > Here is my pesudocode:   
   > class B {};   
   > class A {   
   > public:   
   >   std::map m_myMap;   
   >   A::A() {   
   >       m_myMap[0] = new B();   
   >       pthread_t threadID;   
   >       pthread_create(&threadID, NULL, start, NULL);   
   >   }   
   >   static void* start(void*) {   
   >       // use m_myMap[0] here   
   >   }   
   > }   
   > I wonder whether m_myMap[0] may contain some invalid value since the   
   > new thread might be in another CPU that might not see the change to   
   > m_myMap[0] in the constructor yet (i.e. the change only 'exists' in   
   > one of the CPU's caches).   
   > Thanks in advance.   
      
   No idea (although it would be insane for this not to work). But if you create   
   the new thread using C++11's thread object, the invocation of the thread   
   object's constructor synchronizes with the beginning of the invocation of the   
   called function, which is    
   the formal language that says that all the changes you've made before creating   
   the thread show up in the new thread.   
      
   --   
   Pete   
   Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The Standard   
   C++ Library Extensions: a Tutorial and Reference (www.petebecker.com/tr1book)   
      
      
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