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Combination of mmap() and memalign() in Linux/GCC?


Combination of mmap() and memalign() in Linux/GCC?

By : Petr K
Date : November 20 2020, 09:01 AM
this will help Just mmap a block that is (first rounded to the next power of) twice as big as what you need and then munmap what is not needed.
code :


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Linux mmap() error

Linux mmap() error


By : Edward
Date : March 29 2020, 07:55 AM
hope this fix your issue How big is pid_index getting? Are you perhaps reading more than 100 characters without finding a space?
By the way, this
code :
while ( membuffer[n++] != ' ' )
    pid_num[pid_index++] = membuffer[n] ;
while ( membuffer[n] != ' ' )
    pid_num[pid_index++] = membuffer[n++] ;
Does MappedByteBuffer use mmap under linux?

Does MappedByteBuffer use mmap under linux?


By : tim gates
Date : March 29 2020, 07:55 AM
this one helps. Very simple question, assuming the case under Linux, not windows. , The documentation for MappedByteBuffer clearly states:
Lifetime of MMAP value in linux

Lifetime of MMAP value in linux


By : user2450670
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You don't need to renew the mapping. It will stay valid in the calling process until you explicitly unmap it (or the process ends).
What is equivalent mmap in C++ for linux?

What is equivalent mmap in C++ for linux?


By : Mahesh
Date : March 29 2020, 07:55 AM
Does that help The C++ equivalent is auto LCDdata = static_cast(mmap(...
In C++ we prefer to define out variables only when we initialize them, and because of that we often don't need to specify the type anymore. Here, we don't need to repeat unsigned char*.
Linux MMAP internals

Linux MMAP internals


By : lanxan
Date : March 29 2020, 07:55 AM
it helps some times mmap is basically programmatic access to the Virtual Memory sub system.
When you have, say, 1G file, and you mmap it, you get a pointer to "the entire" file as if it were in memory.
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