Thomas Gummerer t.gumme...@gmail.com schrieb im Newsbeitrag
news:134529-6925-3-git-send-email-t.gumme...@gmail.com...
Add the possibility of re-reading the index file, if it changed
while reading.
The index file might change during the read, causing outdated
information to be displayed. We check if the index file changed
by using its stat data as heuristic.
Signed-off-by: Thomas Gummerer t.gumme...@gmail.com
---
read-cache.c | 87
+---
1 file changed, 60 insertions(+), 27 deletions(-)
diff --git a/read-cache.c b/read-cache.c
index 6a8b4b1..cdd8480 100644
--- a/read-cache.c
+++ b/read-cache.c
...
@@ -1186,38 +1209,48 @@ int read_index_from(struct index_state *istate, const
char *path)
errno = ENOENT;
istate-timestamp.sec = 0;
istate-timestamp.nsec = 0;
- fd = open(path, O_RDONLY);
- if (fd 0) {
- if (errno == ENOENT)
- return 0;
- die_errno(index file open failed);
- }
+ do {
+ err = 0;
+ fd = open(path, O_RDONLY);
+ if (fd 0) {
+ if (errno == ENOENT)
+ return 0;
+ die_errno(index file open failed);
+ }
- if (fstat(fd, st))
- die_errno(cannot stat the open index);
+ if (fstat(fd, st_old))
+ die_errno(cannot stat the open index);
- errno = EINVAL;
- mmap_size = xsize_t(st.st_size);
- mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd,
0);
- close(fd);
- if (mmap == MAP_FAILED)
- die_errno(unable to map index file);
+ errno = EINVAL;
+ mmap_size = xsize_t(st_old.st_size);
+ mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE, fd, 0);
+ close(fd);
+ if (mmap == MAP_FAILED)
+ die_errno(unable to map index file);
- hdr = mmap;
- if (verify_hdr_version(istate, hdr, mmap_size) 0)
- goto unmap;
+ hdr = mmap;
+ if (verify_hdr_version(istate, hdr, mmap_size) 0)
+ err = 1;
- if (istate-ops-verify_hdr(mmap, mmap_size) 0)
- goto unmap;
+ if (istate-ops-verify_hdr(mmap, mmap_size) 0)
+ err = 1;
- istate-ops-read_index(istate, mmap, mmap_size);
- istate-timestamp.sec = st.st_mtime;
- istate-timestamp.nsec = ST_MTIME_NSEC(st);
+ if (istate-ops-read_index(istate, mmap, mmap_size) 0)
+ err = 1;
+ istate-timestamp.sec = st_old.st_mtime;
+ istate-timestamp.nsec = ST_MTIME_NSEC(st_old);
+ if (lstat(path, st_new))
+ die_errno(cannot stat the open index);
- munmap(mmap, mmap_size);
- return istate-cache_nr;
+ munmap(mmap, mmap_size);
+
+ if (!index_changed(st_old, st_new) !err)
+ return istate-cache_nr;
+
+ usleep(10*1000);
usleep() is not available to anybody, e.g. it is not in HP NonStop (not in
every case at least)
Bye, Jojo
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