需要分配比size_t更多的空间 [英] Need to Allocate more space than size_t
问题描述
嗨伙计
我有一个特殊的问题。我必须在系统上分配超过size_t
的连续字节。在我做了一个malloc之后..我无法
做一个realloc，因为它需要size_t作为新的大小而不是
增量大小..
你能告诉我使用哪个库/系统调用..
Plz考虑到这种操作的所有物理硬件需求
可用...我知道这听起来很疯狂......但是请帮帮我这个
....
先谢谢
Rahul
hi folks
i have a peculiar problem. i have to allocate more than size_t
consequtive bytes on a system . after i do a malloc .. i am unable to
do a realloc because it takes size_t as a new size and not as an
incremental size..
can you tell me which library/system call to use..
Plz consider that all the physical hardware req for such an operation
is available... i know this sounds crazy... but just help me out here
....
Thanks in Advance
Rahul
推荐答案
i有一个特殊的问题。我必须在系统上分配超过size_t
的连续字节。我做了一个malloc ..我无法
i have a peculiar problem. i have to allocate more than size_t
consequtive bytes on a system . after i do a malloc .. i am unable to
连续字节和动态分配???
consequtive bytes and dynamic allocation ???
ra ******** ***********@gmail.com 写道：
嗨伙计
i有一个特殊的问题。我必须在系统上分配超过size_t
的连续字节。在我做了一个malloc之后..我无法
做一个realloc，因为它需要size_t作为新的大小而不是
增量大小..
你能告诉我使用哪个库/系统调用..
hi folks
i have a peculiar problem. i have to allocate more than size_t
consequtive bytes on a system . after i do a malloc .. i am unable to
do a realloc because it takes size_t as a new size and not as an
incremental size..
can you tell me which library/system call to use..
这可能是徘徊在off-topic for comp.lang.c中 - 标准语言中没有
。
你必须深入研究O / S才能做到这一点，如果它完全可以。
在类似非x的系统上，brk（）或sbrk（）调用可能是相关的
，或内存映射调用（mmap（））但是...
你实际上能够处理的内存多于size_t可以表示吗？
您将受到限制，例如
可寻址性等问题。如果您正在使用32位O / S，那么例如，你不能为
（AFAIK）提供超过4Gb的地址空间。
This is probably wandering into "Off-topic for comp.lang.c" - there''s
no way in the standard language.
You''d have to delve into the O/S to do this, if it is possible at all.
On un*x-like systems the "brk()" or "sbrk()" calls are probably
relevant, or the memory-mapping calls (mmap()) but...
Are you actually able to deal with more memory than size_t can denote?
You will be limited, one way or another by issues such as
addressability.. If you are working on a 32-bit O/S, then you cannot
(AFAIK) have more than 4Gb of address space for a process, for example.
Plz考虑所有物理硬件需要这样的操作
可用...
Plz consider that all the physical hardware req for such an operation
is available...
但是如果O / S不能访问超过size_t可以表示，那根本没有帮助
..
But if the O/S can''t access more than size_t can denote, that''s no help
at all..
i知道这听起来很疯狂......但只是帮助我这里
i know this sounds crazy... but just help me out here
您可能需要向我们提供更多信息，但我们可能会在与您的平台相关的新闻组中指出
...
You probably need to give us more information, but we''ll probably point
you at a newsgroup relating to your platform...
" ra*******************@gmail.com" < ra ******************* @ gmail.com>
写道：
"ra*******************@gmail.com" <ra*******************@gmail.com>
wrote:
i有一个特殊的问题。我必须在系统上分配超过size_t
的连续字节。在我做了一个malloc之后..我无法
做一个realloc，因为它需要size_t作为新的大小而不是
增量大小..
你能告诉我使用哪个库/系统调用..
i have a peculiar problem. i have to allocate more than size_t
consequtive bytes on a system . after i do a malloc .. i am unable to
do a realloc because it takes size_t as a new size and not as an
incremental size..
can you tell me which library/system call to use..
没有。如果你需要的内存超过
size_t中指定的内存，ISO C将无法执行此操作。理想情况下，这甚至不应该是b
;你的实现应该使size_t足够大，以便为每个可能的内存块大小提供
。
Richard
There isn''t any. If you need more memory than can be specified in a
size_t, ISO C gives you no way to do so. Ideally, this shouldn''t even be
possible; your implementation should make size_t large enough to cater
for every possible memory block size.
Richard
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