Memory Mapped Files
mmap module
- Provides access to memory mapped files and the mmap() system call
import mmap
import os
f = os.open("foo", os.O_RDWR)
m = mmap.mmap(f, 32768, mmap.MAP_SHARED, mmap.PROT_READ | mmap.PROT_WRITE)
m[10] = 'x'
print m[200:300]
m.move(10000,20000,2000)
...
m.close()
- Support anonymous shared memory, private/shared mappings, etc.
Comments
- Underlying file has to be opened with the same permissions
- Usually only works in page sized regions (mmap.PAGESIZE).
- Also works on Windows (slightly different API).
|