Question

Visual Leak Detector在以下代码中观察到内存泄漏（次要40个字节）..

...
void simulatememoryleak(){
        boost::asio::io_service m_IOService;
        boost::asio::serial_port m_SerialPort( m_IOService, "COM21" );;

        m_SerialPort.cancel();
        m_SerialPort.close();
        m_IOService.stop();
        m_IOService.reset();
}
..

有谁能说明这是为什么？

我还向VLD发布了问题并推动了社区..

Answer 1

在我的linux机器上，只有在没有打开串口的权限时它才会泄漏（在这种情况下，它会因异常而中止）。

这是工作运行的一个valgrind¹：

$ sudo valgrind --leak-check=full ./test 
==21281== Memcheck, a memory error detector
==21281== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==21281== Using Valgrind-3.10.0.SVN and LibVEX; rerun with -h for copyright info
==21281== Command: ./test
==21281== 
==21281== 
==21281== HEAP SUMMARY:
==21281==     in use at exit: 0 bytes in 0 blocks
==21281==   total heap usage: 10 allocs, 10 frees, 851 bytes allocated
==21281== 
==21281== All heap blocks were freed -- no leaks are possible
==21281== 
==21281== For counts of detected and suppressed errors, rerun with: -v
==21281== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

如果没有以root用户身份运行，我会

==21286==      possibly lost: 331 bytes in 4 blocks
==21286==    still reachable: 664 bytes in 8 blocks

¹使用/dev/ttyS0或类似的

提升serial_port内存泄漏

1 个答案: