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From 2002-03-05 Scott Pakin <pakin@uiuc.edu>

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* mmap-sup.c (MAP_PRIVATE_OR_SHARED): Define.
(__mmalloc_mmap_morecore): Use.
(__mmalloc_remap_core): Use.
This commit is contained in:
Andrew Cagney 2002-04-07 17:58:57 +00:00
parent c657a1f082
commit aeec20bafb
2 changed files with 23 additions and 6 deletions
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7
mmalloc/ChangeLog
View File

@ -1,3 +1,10 @@
2002-04-07 Andrew Cagney <ac131313@redhat.com>
From 2002-03-05 Scott Pakin <pakin@uiuc.edu>
* mmap-sup.c (MAP_PRIVATE_OR_SHARED): Define.
(__mmalloc_mmap_morecore): Use.
(__mmalloc_remap_core): Use.
2000-05-17 Eli Zaretskii <eliz@is.elta.co.il>
* Makefile.in (install-info): Make sure $(infodir) exists. Run

22
mmalloc/mmap-sup.c
View File

@ -48,6 +48,15 @@ extern int getpagesize PARAMS ((void));
#define PAGE_ALIGN(addr) (caddr_t) (((long)(addr) + pagesize - 1) & \
~(pagesize - 1))
/* Return MAP_PRIVATE if MDP represents /dev/zero. Otherwise, return
MAP_SHARED. */
#define MAP_PRIVATE_OR_SHARED(MDP) ((MDP -> flags & MMALLOC_DEVZERO) \
? MAP_PRIVATE \
: MAP_SHARED)
/* Get core for the memory region specified by MDP, using SIZE as the
amount to either add to or subtract from the existing region. Works
like sbrk(), but using mmap(). */
@ -113,7 +122,7 @@ __mmalloc_mmap_morecore (mdp, size)
{
/* Let mmap pick the map start address */
mapto = mmap (0, mapbytes, PROT_READ | PROT_WRITE,
MAP_SHARED, mdp -> fd, foffset);
MAP_PRIVATE_OR_SHARED (mdp), mdp -> fd, foffset);
if (mapto != (caddr_t) -1)
{
mdp -> base = mdp -> breakval = mapto;
@ -125,7 +134,8 @@ __mmalloc_mmap_morecore (mdp, size)
else
{
mapto = mmap (mdp -> top, mapbytes, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FIXED, mdp -> fd, foffset);
MAP_PRIVATE_OR_SHARED (mdp) | MAP_FIXED, mdp -> fd,
foffset);
if (mapto == mdp -> top)
{
mdp -> top = moveto;
@ -152,7 +162,7 @@ __mmalloc_remap_core (mdp)
/* FIXME: Quick hack, needs error checking and other attention. */
base = mmap (mdp -> base, mdp -> top - mdp -> base,
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED,
PROT_READ | PROT_WRITE, MAP_PRIVATE_OR_SHARED (mdp) | MAP_FIXED,
mdp -> fd, 0);
return ((PTR) base);
}
@ -166,13 +176,13 @@ mmalloc_findbase (size)
caddr_t base = NULL;
#ifdef MAP_ANONYMOUS
flags = MAP_SHARED | MAP_ANONYMOUS;
flags = MAP_PRIVATE | MAP_ANONYMOUS;
fd = -1;
#else
#ifdef MAP_FILE
flags = MAP_SHARED | MAP_FILE;
flags = MAP_PRIVATE | MAP_FILE;
#else
flags = MAP_SHARED;
flags = MAP_PRIVATE;
#endif
fd = open ("/dev/zero", O_RDWR);
if (fd != -1)