1 //总体来看是和内存设置有关的 2 #if defined(WIN32) && defined(MAX_MEMORY_GB) 3     if( MAX_MEMORY_GB>0 ) 4     { 5         //SIZE_T是ULONG_PTR类型又是unsigned __int64类型取值范围为2到2的64次方，貌似和64为操作系统支持的理论内存值有关系 6         SIZE_T peakMemory = 1; 7         peakMemory <<= 30;//peakMemory等于peakMemory（1）乘以2的30次方，2的30次方就是1GB，也就是说peakMemory是1GB 8         peakMemory *= MAX_MEMORY_GB; 9         //%.2f宽度无限制，小数点后保留两位10         printf( "Limiting memory usage to %.2f GB\n" , float( peakMemory>>30 ) );11         //创建了一个工作对象（lpJobAttributes，lpName）安全属性+工作对象名称12         HANDLE h = CreateJobObject( NULL , NULL );13         AssignProcessToJobObject( h , GetCurrentProcess() );14 15         JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli = { 0 };16         jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_JOB_MEMORY;17         jeli.JobMemoryLimit = peakMemory;18         if( !SetInformationJobObject( h , JobObjectExtendedLimitInformation , &jeli , sizeof( jeli ) ) )19             fprintf( stderr , "Failed to set memory limit\n" );20     }21 #endif // defined(WIN32) && defined(MAX_MEMORY_GB)