Re: [PATCH v3 03/16] index-helper: new daemon for caching index and related stuff

On Thu, 2016-04-07 at 16:14 +0200, Johannes Schindelin wrote:

Hi,

On Thu, 7 Apr 2016, Johannes Sixt wrote:

quoted

Am 07.04.2016 um 00:11 schrieb David Turner:

quoted

+static void share_index(struct index_state *istate, struct shm
*is)
+{
+	void *new_mmap;
+	if (istate->mmap_size <= 20 ||
+	    hashcmp(istate->sha1,
+		    (unsigned char *)istate->mmap + istate
->mmap_size - 20)

quoted

quoted

+	    !hashcmp(istate->sha1, is->sha1) ||
+	    git_shm_map(O_CREAT | O_EXCL | O_RDWR, 0700, istate
->mmap_size,
+			&new_mmap, PROT_READ | PROT_WRITE,
MAP_SHARED,
+			"git-index-%s", sha1_to_hex(istate
->sha1)) < 0)

Builds which have NO_MMAP set require that MAP_PRIVATE is set. So I
would
guess that at this point you leave those builds behind. Unless we
declare
such systems as hopelessly outdated and remove NO_MMAP and
compat/mmap.c or
you support index-helper only when NO_MMAP is not set.

I vote for the latter: support index-helper only when NO_MMAP is
unset.

Will fix, thanks.