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* shared.cc (open_shared): Fix memory reservation of essential shared

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memory regions.  Drop delta computations since delta is always 0 in
	non-relocated case.  Add a comment.
This commit is contained in:
Corinna Vinschen
2011-10-24 09:19:58 +00:00
parent 31d2bedc58
commit b3480fbefb
2 changed files with 13 additions and 7 deletions
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14
winsup/cygwin/shared.cc
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@ -293,19 +293,19 @@ open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
if (*m == SH_CYGWIN_SHARED && offsets[0])
{
ptrdiff_t delta = (caddr_t) shared - (caddr_t) off_addr (0);
offsets[0] = (caddr_t) shared - (caddr_t) cygwin_hmodule;
for (int i = SH_USER_SHARED + 1; i < SH_TOTAL_SIZE; i++)
/* Reserve subsequent shared memory areas in non-relocated case only.
There's no good reason to reserve the console shmem, because it's
not yet known if we will allocate it at all. */
for (int i = SH_USER_SHARED; i < SH_SHARED_CONSOLE; i++)
{
unsigned size = offsets[i] - offsets[i + 1];
offsets[i] += delta;
DWORD size = offsets[i - 1] - offsets[i];
if (!VirtualAlloc (off_addr (i), size, MEM_RESERVE, PAGE_NOACCESS))
continue; /* oh well */
}
offsets[SH_TOTAL_SIZE] += delta;
}
debug_printf ("name %W, n %d, shared %p (wanted %p), h %p, *m %d", mapname, n, shared, addr, shared_h, *m);
debug_printf ("name %W, n %d, shared %p (wanted %p), h %p, *m %d",
mapname, n, shared, addr, shared_h, *m);
return shared;
}