valgrind 错误信息 求助

zengeronline

我写了一个linux下的网络转串口程序,网络链接上后就建立一个子线程,主线程负责接收网络数据,然后通过串口发送出去,子线程接收串口数据,然后通过网络发送出去,用valgrind调试看是否有内存泄漏的时候有下面的错误信息

1. 
   
2. ==2976==
   
3. ==2976== HEAP SUMMARY:
   
4. ==2976==     in use at exit: 344 bytes in 2 blocks
   
5. ==2976==   total heap usage: 121 allocs, 119 frees, 12,520 bytes allocated
   
6. ==2976==
   
7. ==2976== 56 bytes in 1 blocks are still reachable in loss record 1 of 2
   
8. ==2976==    at 0x4C274A8: malloc (vg_replace_malloc.c:236)
   
9. ==2976==    by 0x400D2F4: _dl_map_object_deps (dl-deps.c:506)
   
10. ==2976==    by 0x40135F4: dl_open_worker (dl-open.c:262)
    
11. ==2976==    by 0x400E985: _dl_catch_error (dl-error.c:178)
    
12. ==2976==    by 0x4012FB9: _dl_open (dl-open.c:554)
    
13. ==2976==    by 0x591CBDF: do_dlopen (dl-libc.c:86)
    
14. ==2976==    by 0x400E985: _dl_catch_error (dl-error.c:178)
    
15. ==2976==    by 0x591CD36: __libc_dlopen_mode (dl-libc.c:47)
    
16. ==2976==    by 0x4E3CFEB: pthread_cancel_init (unwind-forcedunwind.c:53)
    
17. ==2976==    by 0x4E39BC2: pthread_cancel (pthread_cancel.c:40)
    
18. ==2976==    by 0x402F4A: general_thread_cancel(unsigned long) (generalthread.cpp:225)
    
19. ==2976==    by 0x4070B3: CUartDemon::UartDemonProcess() (uartdemon.cpp:425)
    
20. ==2976==
    
21. ==2976== 288 bytes in 1 blocks are possibly lost in loss record 2 of 2
    
22. ==2976==    at 0x4C267CC: calloc (vg_replace_malloc.c:467)
    
23. ==2976==    by 0x4012455: _dl_allocate_tls (dl-tls.c:300)
    
24. ==2976==    by 0x4E34728: pthread_create@@GLIBC_2.2.5 (allocatestack.c:561)
    
25. ==2976==    by 0x402F30: general_thread_create(unsigned long*, int (*)(void*), void*) (generalthread.cpp:221)
    
26. ==2976==    by 0x407086: CUartDemon::UartDemonProcess() (uartdemon.cpp:420)
    
27. ==2976==    by 0x406296: main (uartdemon.cpp:254)
    
28. ==2976==
    
29. ==2976== LEAK SUMMARY:
    
30. ==2976==    definitely lost: 0 bytes in 0 blocks
    
31. ==2976==    indirectly lost: 0 bytes in 0 blocks
    
32. ==2976==      possibly lost: 288 bytes in 1 blocks
    
33. ==2976==    still reachable: 56 bytes in 1 blocks
    
34. ==2976==         suppressed: 0 bytes in 0 blocks
    
35. ==2976==
    
36. ==2976== For counts of detected and suppressed errors, rerun with: -v
    
37. ==2976== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 4 from 4)
    

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上面的错误感觉都不是我写的函数导致,而是系统条用函数导致的问题,这些错误是不是可以忽略啊,如果不可以应该怎么样消除掉这个错误呢?

先行谢过

zengeronline

在网上找到了一些解答

http://blog.csdn.net/jiqiren007/archive/2010/10/22/5959810.aspx

xinglp

回复 1# zengeronline


   用pthread_exit(NULL)退出试试

zengeronline

回复 3# xinglp

按照我在网上找的方法 join了子进程后就没有 possibly lost 错误了,但是 reachable在存在,然后在网上看的是这个应该是没有关系的.

在子线程中本来就写了pthread_exit,但是由于使用pthread_cancel结束就不知道是否运行到了exit,反正我通过方法保证运行到exit时,也还是有reachable lost的提示

1. socket close by client
   
2. ==9809==
   
3. ==9809== HEAP SUMMARY:
   
4. ==9809==     in use at exit: 56 bytes in 1 blocks
   
5. ==9809==   total heap usage: 120 allocs, 119 frees, 12,480 bytes allocated
   
6. ==9809==
   
7. ==9809== 56 bytes in 1 blocks are still reachable in loss record 1 of 1
   
8. ==9809==    at 0x4C274A8: malloc (vg_replace_malloc.c:236)
   
9. ==9809==    by 0x400D2F4: _dl_map_object_deps (dl-deps.c:506)
   
10. ==9809==    by 0x40135F4: dl_open_worker (dl-open.c:262)
    
11. ==9809==    by 0x400E985: _dl_catch_error (dl-error.c:178)
    
12. ==9809==    by 0x4012FB9: _dl_open (dl-open.c:554)
    
13. ==9809==    by 0x591CBDF: do_dlopen (dl-libc.c:86)
    
14. ==9809==    by 0x400E985: _dl_catch_error (dl-error.c:178)
    
15. ==9809==    by 0x591CD36: __libc_dlopen_mode (dl-libc.c:47)
    
16. ==9809==    by 0x4E3CFEB: pthread_cancel_init (unwind-forcedunwind.c:53)
    
17. ==9809==    by 0x4E39BC2: pthread_cancel (pthread_cancel.c:40)
    
18. ==9809==    by 0x402FFA: general_thread_cancel(unsigned long) (generalthread.cpp:225)
    
19. ==9809==    by 0x407075: CUartDemon::UartDemonProcess() (uartdemon.cpp:414)
    
20. ==9809==
    
21. ==9809== LEAK SUMMARY:
    
22. ==9809==    definitely lost: 0 bytes in 0 blocks
    
23. ==9809==    indirectly lost: 0 bytes in 0 blocks
    
24. ==9809==      possibly lost: 0 bytes in 0 blocks
    
25. ==9809==    still reachable: 56 bytes in 1 blocks
    
26. ==9809==         suppressed: 0 bytes in 0 blocks
    
27. ==9809==
    
28. ==9809== For counts of detected and suppressed errors, rerun with: -v
    
29. ==9809== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)
    

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xinglp

主线程 main函数也用pthread_exit(NULL)退出呢