give priority to progress messages
In theory it is possible for sideband channel #2 to be delayed if
pack data is quick to come up for sideband channel #1. And because
data for channel #2 is read only 128 bytes at a time while pack data
is read 8192 bytes at a time, it is possible for many pack blocks to
be sent to the client before the progress message fifo is emptied,
making the situation even worse. This would result in totally garbled
progress display on the client's console as local progress gets mixed
with partial remote progress lines.
Let's prevent such situations by giving transmission priority to
progress messages over pack data at all times.
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin-upload-archive.c b/builtin-upload-archive.c
index f6c4c0f..58f6b8f 100644
--- a/builtin-upload-archive.c
+++ b/builtin-upload-archive.c
@@ -132,7 +132,6 @@
while (1) {
struct pollfd pfd[2];
- ssize_t processed[2] = { 0, 0 };
int status;
pfd[0].fd = fd1[0];
@@ -147,15 +146,14 @@
}
continue;
}
- if (pfd[0].revents & POLLIN)
- /* Data stream ready */
- processed[0] = process_input(pfd[0].fd, 1);
if (pfd[1].revents & POLLIN)
/* Status stream ready */
- processed[1] = process_input(pfd[1].fd, 2);
- /* Always finish to read data when available */
- if (processed[0] || processed[1])
- continue;
+ if (process_input(pfd[1].fd, 2))
+ continue;
+ if (pfd[0].revents & POLLIN)
+ /* Data stream ready */
+ if (process_input(pfd[0].fd, 1))
+ continue;
if (waitpid(writer, &status, 0) < 0)
error_clnt("%s", lostchild);
diff --git a/upload-pack.c b/upload-pack.c
index b98b1d6..8734f1d 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -218,6 +218,23 @@
}
continue;
}
+ if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
+ /* Status ready; we ship that in the side-band
+ * or dump to the standard error.
+ */
+ sz = xread(pack_objects.err, progress,
+ sizeof(progress));
+ if (0 < sz)
+ send_client_data(2, progress, sz);
+ else if (sz == 0) {
+ close(pack_objects.err);
+ pack_objects.err = -1;
+ }
+ else
+ goto fail;
+ /* give priority to status messages */
+ continue;
+ }
if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
/* Data ready; we keep the last byte to ourselves
* in case we detect broken rev-list, so that we
@@ -255,21 +272,6 @@
if (sz < 0)
goto fail;
}
- if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
- /* Status ready; we ship that in the side-band
- * or dump to the standard error.
- */
- sz = xread(pack_objects.err, progress,
- sizeof(progress));
- if (0 < sz)
- send_client_data(2, progress, sz);
- else if (sz == 0) {
- close(pack_objects.err);
- pack_objects.err = -1;
- }
- else
- goto fail;
- }
}
if (finish_command(&pack_objects)) {
