summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJunio C Hamano <gitster@pobox.com>2016-05-18 14:40:06 -0700
committerJunio C Hamano <gitster@pobox.com>2016-05-18 14:40:06 -0700
commitf12fffd347ac1efc11381dfdce5aa4108731742d (patch)
treef4e31ff094c46c6b82a5ed8f67f039e7b13467c9
parentc555e529ac1d29ed98229698d38f77ebb684a017 (diff)
parentd5425d10ca68a297061f87f4460dd7e0b32b39a6 (diff)
downloadgit-f12fffd347ac1efc11381dfdce5aa4108731742d.tar.gz
Merge branch 'js/win32-mmap' into HEAD
mmap emulation on Windows has been optimized and work better without consuming paging store when not needed. * js/win32-mmap: mmap(win32): avoid expensive fstat() call mmap(win32): avoid copy-on-write when it is unnecessary win32mmap: set errno appropriately
-rw-r--r--compat/win32mmap.c31
1 files changed, 18 insertions, 13 deletions
diff --git a/compat/win32mmap.c b/compat/win32mmap.c
index 80a8c9af4f..519d51f2b6 100644
--- a/compat/win32mmap.c
+++ b/compat/win32mmap.c
@@ -2,37 +2,42 @@
void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
{
- HANDLE hmap;
+ HANDLE osfhandle, hmap;
void *temp;
- off_t len;
- struct stat st;
+ LARGE_INTEGER len;
uint64_t o = offset;
uint32_t l = o & 0xFFFFFFFF;
uint32_t h = (o >> 32) & 0xFFFFFFFF;
- if (!fstat(fd, &st))
- len = st.st_size;
- else
+ osfhandle = (HANDLE)_get_osfhandle(fd);
+ if (!GetFileSizeEx(osfhandle, &len))
die("mmap: could not determine filesize");
- if ((length + offset) > len)
- length = xsize_t(len - offset);
+ if ((length + offset) > len.QuadPart)
+ length = xsize_t(len.QuadPart - offset);
if (!(flags & MAP_PRIVATE))
die("Invalid usage of mmap when built with USE_WIN32_MMAP");
- hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), NULL,
- PAGE_WRITECOPY, 0, 0, NULL);
+ hmap = CreateFileMapping(osfhandle, NULL,
+ prot == PROT_READ ? PAGE_READONLY : PAGE_WRITECOPY, 0, 0, NULL);
- if (!hmap)
+ if (!hmap) {
+ errno = EINVAL;
return MAP_FAILED;
+ }
- temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start);
+ temp = MapViewOfFileEx(hmap, prot == PROT_READ ?
+ FILE_MAP_READ : FILE_MAP_COPY, h, l, length, start);
if (!CloseHandle(hmap))
warning("unable to close file mapping handle");
- return temp ? temp : MAP_FAILED;
+ if (temp)
+ return temp;
+
+ errno = GetLastError() == ERROR_COMMITMENT_LIMIT ? EFBIG : EINVAL;
+ return MAP_FAILED;
}
int git_munmap(void *start, size_t length)