valgrind内存泄漏错误时使用pthread_create [英] valgrind memory leak errors when using pthread_create
问题描述
我正在使用pthread库编写程序。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:
I'm writing a program using the pthread library. When i run my program with the command valgrind --leak-check=full, i get the following errors description:
==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 - 在函数结束时调用函数pthread_exit。因此,在验证这不是问题后,可能是什么问题?
Every time i call pthread_create, with a certain function - i call the function pthread_exit in the end of the function. So, after verifying this is not the problem, what could be the problem?
推荐答案
线程的资源不会在终止时立即释放,除非
线程是使用分离状态
属性设置为
PTHREAD_CREATE_DETACHED
创建的如果为
及其 pthread_t
调用 pthread_detach
。
A thread's resources are not immediately released at termination, unless
the thread was created with the detach state
attribute set to
PTHREAD_CREATE_DETACHED
, or if pthread_detach
is called for
its pthread_t
.
未被删除的线程将保持终止状态,直到其标识符传递给 pthread_join
或 pthread_detach
。
An undetached thread will remain terminated state until its identifier is passed to pthread_join
or pthread_detach
.
总而言之,您有三个选项:
To sum it up, you have three options:
- (PTHREAD_CREATE_DETACHED属性)
- 在创建后分离您的主题(通过调用
pthread_detach
)或 - 加入被终止的线程以回收它们(通过调用
pthread_join
)。
- create your thread with detached attribute set(PTHREAD_CREATE_DETACHED attribute)
- Detach your thread after creation (by calling
pthread_detach
), or - Join with the terminated threads to recycle them (by calling
pthread_join
).
Hth。
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