Python怎样使用:使用 pthread_create时出现valgrind内存泄漏错误

我正在使用 pthread 库编写一个程序。当我使用命令valgrind --leak-check=full运行我的程序时,我得到以下错误描述:

==11784==  
==11784== **HEAP SUMMARY:**  
==11784==     in use at exit: 4,952 bytes in 18 blocks  
==11784==   total heap usage: 1,059 allocs, 1,041 frees, 51,864 bytes allocated  
==11784==  
==11784== **288 bytes** in 1 blocks are possibly lost in loss record 2 of 3  
==11784==    at 0x4C2380C: calloc (vg_replace_malloc.c:467)  
==11784==    by 0x4010D2E: _dl_allocate_tls (dl-tls.c:300)  
==11784==    by 0x55DC218: **pthread_create**@@GLIBC_2.2.5 (allocatestack.c:570)  
==11784==    by 0x401BC0: initdevice(char*) (in /a/fr-01/vol/home/stud/lim/workspace  /Ex3/l)  
==11784==    by 0x406D05: main (in /a/fr-01/vol/home/stud/lim/workspace/Ex3/l)  
==11784==  
==11784== **4,608 bytes** in 16 blocks are possibly lost in loss record 3 of 3  
==11784==    at 0x4C2380C: calloc (vg_replace_malloc.c:467)  
==11784==    by 0x4010D2E: _dl_allocate_tls (dl-tls.c:300)  
==11784==    by 0x55DC218: **pthread_create**@@GLIBC_2.2.5 (allocatestack.c:570)    
==11784==    by 0x40268F: write2device(char*, int) (in /a/fr-01/vol/home/stud/lim/workspace/Ex3/l)  
==11784==    by 0x406D7B: main (in /a/fr-01/vol/home/stud/lim/workspace/Ex3/l)  
==11784==  
==11784== **LEAK SUMMARY:**  
==11784==    definitely lost: 0 bytes in 0 blocks  
==11784==    indirectly lost: 0 bytes in 0 blocks  
==11784==      possibly lost: 4,896 bytes in 17 blocks  
==11784==    still reachable: 56 bytes in 1 blocks  
==11784==         suppressed: 0 bytes in 0 blocks  
==11784== Reachable blocks (those to which a pointer was found) are not shown.  
==11784== To see them, rerun with: --leak-check=full --show-reachable=yes  
==11784==  
==11784== For counts of detected and suppressed errors, rerun with: -v  
==11784== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 4 from 4)  

每次调用pthread_create时,使用某个函数-我在函数末尾调用函数pthread_exit。所以,在验证这不是问题之后,可能是什么问题?

43

线程的资源不会在终止时立即释放,除非线程是在detach state属性设置为PTHREAD_CREATE_DETACHED的情况下创建的,或者为其pthread_t调用pthread_detach

未分离的线程将保持终止状态,直到其标识符传递给pthread_joinpthread_detach

总结一下,你有三个选择:

创建具有分离属性集的线程(PTHREAD_CREATE_DETACHED 属性)

创建后分离线程(通过调用pthread_detach),或

加入终止的线程以回收它们(通过调用pthread_join)。

Hth.

5

当不使用可连接线程时,退出线程需要调用pthread_detach(pthread_self())以释放其所有资源。

5

你可以让线程in detached state,以避免内存泄漏,如果线程不应该加入(或只是到期的自己)。

为了明确地创建一个可连接或分离的线程,使用 pthread_create () 例程中的 attr 参数。

声明pthread_attr_t数据类型的 pthread 属性变量

pthread_attr_init()初始化属性变量

将属性分离状态设置为pthread_attr_setdetachstate()

完成后,pthread_attr_destroy()属性使用的免费库资源

1

除了其他用户给您的正确答案外,我建议您阅读以下内容:

Tracking down a memory leak in multithreaded C application

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