C - 检查当前可用的可用 RAM? [英] C - Check currently available free RAM?

问题描述

我知道如何使用 malloc() 和 free() 来分配内存，但是是否也有一个标准的 C 函数来检查剩余多少内存，所以我可以定期调用它以确保我的代码没有内存泄漏?

I know how to use malloc() and free() to allocate memory, but is there also a standard C function to check how much memory is left, so I can call that periodically to make sure my code has no memory leaks?

我唯一能想到的就是在无限循环中调用 malloc(1) 直到它返回错误，但不应该有更有效的方法吗?

The only thing I can think of is calling malloc(1) in a endless loop until it returns an error, but shouldn't there be a more efficient way?

推荐答案

不，没有标准的 C 函数可以做到这一点.您可以使用一些特定于平台的函数来执行某些类型的查询(例如工作集大小)，但这些可能不会有帮助，因为有时内存已被正确 free()d仍然认为是由操作系统分配的，因为 malloc 实现可能会将释放的内存保留在池中.

No, there's no standard C function to do that. There are some platform-specific functions you can use to perform certain types of queries (like working set size), but those probably won't be helpful, because sometimes memory which has been properly free()d is still considered to be allocated by the OS because the malloc implementation might keep the freed memory around in a pool.

如果您想检查内存泄漏，我强烈建议您使用 Valgrind 之类的工具，它可以在各种虚拟机，可以跟踪内存泄漏等功能.

If you want to check for memory leaks, I highly recommend using a tool like Valgrind, which runs your program in a virtual machine of sorts and can track memory leaks, among other features.

如果您在 Windows 上运行，则可以使用 _CrtDbgReport 和/或 _CrtSetDbgFlag 检查内存泄漏.

If you're running on Windows, you can use _CrtDbgReport and/or _CrtSetDbgFlag to check for memory leaks.

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