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* mmap.cc (MapView9x): Note possible uselessness of retrying. 

(MapViewNT): Ditto.
	(mmap64): Fix pre-reservation to work for non NULL, non MAP_FIXED.
This commit is contained in:
Corinna Vinschen 2007-01-17 10:49:24 +00:00
parent cbe2437b28
commit 9f3e3df961
2 changed files with 31 additions and 10 deletions
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6
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,9 @@
2007-01-17 Corinna Vinschen <corinna@vinschen.de>
* mmap.cc (MapView9x): Note possible uselessness of retrying.
(MapViewNT): Ditto.
(mmap64): Fix pre-reservation to work for non NULL, non MAP_FIXED.
2007-01-16 Corinna Vinschen <corinna@vinschen.de>
* autoload.cc (RtlAnsiStringToUnicodeString): Define.

35
winsup/cygwin/mmap.cc
View File

@ -328,7 +328,10 @@ MapView9x (HANDLE h, void *addr, size_t len, DWORD openflags,
/* Try mapping using the given address first, even if it's NULL.
If it failed, and addr was not NULL and flags is not MAP_FIXED,
try again with NULL address. */
try again with NULL address.
Note: Retrying the mapping might be unnecessary, now that mmap64 checks
for a valid memory area first. */
if (!addr)
base = MapViewOfFile (h, access, high, low, len);
else
@ -357,7 +360,10 @@ MapViewNT (HANDLE h, void *addr, size_t len, DWORD openflags,
/* Try mapping using the given address first, even if it's NULL.
If it failed, and addr was not NULL and flags is not MAP_FIXED,
try again with NULL address. */
try again with NULL address.
Note: Retrying the mapping might be unnecessary, now that mmap64 checks
for a valid memory area first. */
ret = NtMapViewOfSection (h, GetCurrentProcess (), &base, 0, commitsize,
&offset, &viewsize, ViewShare, alloc_type, protect);
if (!NT_SUCCESS (ret) && addr && !fixed (flags))
@ -1225,18 +1231,27 @@ go_ahead:
subsequent real mappings. This ensures that we have enough space
for the whole thing. */
orig_len = roundup2 (orig_len, pagesize);
addr = VirtualAlloc (addr, orig_len, MEM_TOP_DOWN | MEM_RESERVE,
PAGE_READWRITE);
if (!addr)
{
__seterrno ();
goto out;
}
if (!VirtualFree (addr, 0, MEM_RELEASE))
PVOID newaddr = VirtualAlloc (addr, orig_len, MEM_TOP_DOWN | MEM_RESERVE,
PAGE_READWRITE);
if (!newaddr)
{
/* If addr is not NULL, but MAP_FIXED isn't given, allow the OS
to choose. */
if (addr && !fixed (flags))
newaddr = VirtualAlloc (NULL, orig_len, MEM_TOP_DOWN | MEM_RESERVE,
PAGE_READWRITE);
if (!newaddr)
{
__seterrno ();
goto out;
}
}
if (!VirtualFree (newaddr, 0, MEM_RELEASE))
{
__seterrno ();
goto out;
}
addr = newaddr;
}
base = mmap_worker (fh, (caddr_t) addr, len, prot, flags, fd, off);