访问预分配的内存块？ [英] access to preallocated block of memory?
问题描述
我在VxWorks上运行python。在操作过程中，vxworks
任务写入保留的内存区域。我需要从python中访问这个块
的内存。最初我以为我可以简单地将
作为一个字符串访问它，但是一个字符串会重新分配并复制这个块
的内存;这不是我可以拥有的东西，因为它会浪费大量的内存。我们在设备上谈论类似40MB的东西
，内存有限。我一直在看阵列。看起来很有希望。
这里最好的路线是什么？理想情况下，我想简单地在保留块的地址和长度中传递
，并且可以访问内存
。
我可以使用一些现有的python对象/工具，还是需要
来创建自定义模块？任何提示，提示或指示肯定会赞赏
！
谢谢，
Greg
I am running python on VxWorks. In the course of operation, a vxworks
tasks writes to a reserved area of memory. I need access to this chunk
of memory from within python. Initially I thought I could simply
access it as a string but a string would reallocate and copy this chunk
of memory; which is not something I can have as it would waste a huge
amount of memory. We''re talking about something like 40MB on a device
with limited RAM. I have been looking at array. It looks promising.
What''s the best route to go here? Ideally, I would like to simply pass
in the address of the reserved block and a length, and have the memory
accessible.
Is there some existing python object/facility I can use or will I need
to create a custom module? Any tips, hints, or pointers would
certainly be appreciated!
Thanks,
Greg
推荐答案
>>> vxworks任务写入保留的内存区域。
是否与mmap模块兼容？
>>> vxworks tasks writes to a reserved area of memory.
Is it compatible with the mmap module ?
On 2005-12-15，Do Re Mi chel La Si Do< en ************** @ OmclaveauO.com>写道：
On 2005-12-15, Do Re Mi chel La Si Do <en**************@OmclaveauO.com> wrote:
vxworks tasks写入保留的内存区域。
vxworks tasks writes to a reserved area of memory.
Is it compatible with the mmap module ?
我从来没有写过VxWorks模块，但它只需要一个
编写一个Linux驱动程序的十二行代码，以便将预定义的地址空间块
映射到用户空间中。
-
格兰特爱德华兹格兰特哇！佑！我在窗口砸了
！
visi.com
I''ve never written a VxWorks module, but it would only take a
dozen or two lines of code to write a Linux driver that would
impliment mmap() to allow a pre-defined block of address space
to be mapped into user space.
--
Grant Edwards grante Yow! Yow! I threw up on
at my window!
visi.com
所以数组无法映射前现有大块的记忆？我没有在mmap模块中移植
，因为VxWorks上不存在这样的语义。基于
到目前为止的评论，看起来mmap是我最好的选择吗？任何
其他选项？
So array can not map a pre-existing chunk of memory? I did not port
the mmap module because such semantics don''t exist on VxWorks. Based
on comments thus far, it looks like mmap is my best bet here? Any
other options?
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