$home/manuals/plan9_2nd/2/segflush

SEGFLUSH(2)                   System Calls Manual                  SEGFLUSH(2)



NAME
       segflush - flush instruction and data caches

SYNOPSIS
       #include <u.h>
       #include <libc.h>

       int  segflush(void *va, ulong len)

DESCRIPTION
       Segflush  invalidates  any  instruction  cache and writes back any data
       cache associated with pages contained in a segment.  All subsequent new
       pages in the segment will also be flushed when first referenced.

       Va  is  an address within the segment to be flushed; it is rounded down
       to the nearest page boundary.  Len specifies the length in bytes of the
       memory  to  flush;  va+len  is rounded up to the nearest page boundary.
       Segflush works correctly when the memory straddles multiple segments.

       Correct use of segflush depends on an understanding of the cache archi‐
       tecture of the specific machine.

SOURCE
       /sys/src/libc/9syscall

SEE ALSO
       segattach(2), segbrk(2)
       /proc/*/segment

DIAGNOSTICS
       Sets errstr.



                                                                   SEGFLUSH(2)