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mmap.2: Document MAP_STACK flag (new in Linux 2.6.27) 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2008-11-18 10:11:56 -05:00
parent 8bfd40a95e
commit e6205b0c24
1 changed files with 16 additions and 3 deletions
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19
man2/mmap.2
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@ -35,10 +35,9 @@
.\" Modified 2004-12-08, mtk, formatting tidy-ups
.\" Modified 2006-12-04, mtk, various parts rewritten
.\" 2007-07-10, mtk, Added an example program.
.\" FIXME . We may eventually get MAP_STACK; see
.\" http://lwn.net/Articles/294642 "Tangled up in threads", 19 Aug 08
.\" 2008-11-18, mtk, document MAP_STACK
.\"
.TH MMAP 2 2008-06-05 "Linux" "Linux Programmer's Manual"
.TH MMAP 2 2008-11-18 "Linux" "Linux Programmer's Manual"
.SH NAME
mmap, munmap \- map or unmap files or devices into memory
.SH SYNOPSIS
@ -275,6 +274,20 @@ However, most systems also support
.B MAP_ANONYMOUS
(or its synonym
.BR MAP_ANON ).
.TP
.BR MAP_STACK " (since Linux 2.6.27)"
Allocate the mapping at an address suitable for a process
or thread stack.
This flag is currently a no-op,
but is used in the glibc threading implementation so that
if some architectures require special treatment for stack allocations,
support can later be transparently implemented for glibc.
.\" FIXME . We may eventually get MAP_STACK; see
.\" http://lwn.net/Articles/294642 "Tangled up in threads", 19 Aug 08
.\" commit cd98a04a59e2f94fa64d5bf1e26498d27427d5e7
.\" http://thread.gmane.org/gmane.linux.kernel/720412
.\" "pthread_create() slow for many threads; also time to revisit 64b
.\" context switch optimization?"
.LP
Some systems document the additional flags
.BR MAP_AUTOGROW ,