线程堆栈泄漏通过递归函数 [英] Thread Stack leak through a recursive function

问题描述

我有以下情形，在C实现与pthreads的：

I have following scenario, in C implementation with pthreads :

在主线程（T1）创建另一个线程（T2），它等待的事件。

The main thread(T1) creates another thread(T2) which waits for an event.

在事件T2调用树遍历 recusive 的函数，它接受一个函数指针的动作被树节点上执行。在树的遍历，如果节点找到了FN指针被解雇，创建一个线程（T3），服务节点，应该是正常消亡。

On an event T2 calls a Tree Traversal recusive function that takes in a function pointer for an action to be executed on a Tree node. During Tree traversal, if the node is found the fn pointer is fired that creates a thread (T3), services the node and is supposed to normally die out.

我观察到来自T3的堆栈一个巨大的内存泄漏。在Valgrind的告诉我，

I am observing a huge memory leak that comes from the T3's stack. The Valgrind tells me that

==9251== 2,720 bytes in 20 blocks are possibly lost in loss record 142 of 157

==9251==    at 0x402425F: calloc (vg_replace_malloc.c:467)

==9251==    by 0x4010CDB: _dl_allocate_tls (dl-tls.c:300)

==9251==    by 0x403A2E2: pthread_create@@GLIBC_2.1 (allocatestack.c:561)

==9251==    by 0x80571CC: serviceNode (NodeHndlr.c:432)

==9251==    by 0x804AD88: preOrderTpTraversal (treefunct.c:503)

==9251==    by 0x804AE01: preOrderTpTraversal (treefunct.c:513)

==9251==    by 0x804AE01: preOrderTpTraversal (treefunct.c:513)

==9251==    by 0x804AE01: preOrderTpTraversal (treefunct.c:513)

==9251==    by 0x8057450: serviceproc (NodeHndlr.c:519)

==9251==    by 0x403996D: start_thread (pthread_create.c:300)

==9251==    by 0x411AA4D: clone (clone.S:130)

下面的 serviceproc 是T2
serviceNode 为节点的函数指针。

Here the serviceproc is the T2 serviceNode is the function pointer for the Node.

因此​​最终的系统运行的VM，并创建线程失败，错误code = 11（没有足够的资源）

Thus eventually the system runs out of vm and the thread creation fails with errorcode=11 (not enough resources)

我的问题是，一旦在T3的正常退出，不应该在线程的堆栈被垃圾自动收集或（由 serviceNode 创建）我失去了一些东西在这里。 ？

My question is that once the the T3 (created by serviceNode) exits normally , shouldn't the thread stack be garbage collected automatically or am i missing something here. ?

编辑：或问题，由于与创建函数指针的射击？

or is the issue created with due to firing of the function pointer ?

推荐答案

对于大多数pthreads的实现，你会泄露一些内存，当一个线程退出除非您：

With most pthreads implementations, you will leak some memory when a thread exits unless you either:

• 呼叫在pthread_join（）该线程

• Call pthread_join() that thread

或

创建线程作为分离线程，通过调用pthread_detach（）或作为属性pthread_create的

Create the thread as a detached thread, by calling pthread_detach() or as an attribute to pthread_create

请确保你做上述之一。

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