FIX: Access violation with std::map::erase or std::set::erase in a multithreaded application

// Test.cpp
// Compiler option needed: /MT or /MD
#include <windows.h>
#include <set>

typedef std::set<int> TestSet;

DWORD WINAPI Worker( LPVOID )
{
TestSet set;
int g_cIters =4;

    for( int i=0; i < g_cIters; i++ )
    {
        int r = rand();
        int j;

        for( j=0; j < r; j++ )
        {
        set.insert( j );
        }

        for( j=0; j < r; j++ )
        {
            TestSet::iterator it = set.find( j );
            set.erase( it );
        }
    } 

    return 0;
}     
      
void main()
{
   
    int cThreads = 10;

    HANDLE  aThreads[10];

    for( int i=0; i < cThreads; i++ )
    {
        aThreads[i] = CreateThread( NULL, 0, Worker, NULL, 0, NULL );
    }

    WaitForMultipleObjects( cThreads, aThreads, TRUE, INFINITE );
}