return outfd;
}
+/*
+ * Write a character on the metadata poll pipe to wake the metadata thread.
+ * Returns 0 on success, -1 on error.
+ */
+int consumer_metadata_wakeup_pipe(const struct lttng_consumer_channel *channel)
+{
+ int ret = 0;
+
+ DBG("Waking up metadata poll thread (writing to pipe): channel name = '%s'",
+ channel->name);
+ if (channel->monitor && channel->metadata_stream) {
+ const char dummy = 'c';
+ const ssize_t write_ret = lttng_write(
+ channel->metadata_stream->ust_metadata_poll_pipe[1],
+ &dummy, 1);
+
+ if (write_ret < 1) {
+ if (errno == EWOULDBLOCK) {
+ /*
+ * This is fine, the metadata poll thread
+ * is having a hard time keeping-up, but
+ * it will eventually wake-up and consume
+ * the available data.
+ */
+ ret = 0;
+ } else {
+ PERROR("Failed to write to UST metadata pipe while attempting to wake-up the metadata poll thread");
+ ret = -1;
+ goto end;
+ }
+ }
+ }
+
+end:
+ return ret;
+}
+
/*
* Trigger a dump of the metadata content. Following/during the succesful
* completion of this call, the metadata poll thread will start receiving
err = 0; /* All is OK */
goto end;
}
- DBG("received command on sock");
+ DBG("Received command on sock");
}
/* All is OK */
err = 0;
struct lttng_consumer_local_data *ctx,
bool locked_by_caller)
{
- ssize_t ret, written_bytes;
+ ssize_t ret, written_bytes = 0;
int rotation_ret;
struct stream_subbuffer subbuffer = {};
written_bytes = stream->read_subbuffer_ops.consume_subbuffer(
ctx, stream, &subbuffer);
- /*
- * Should write subbuf_size amount of data when network streaming or
- * the full padded size when we are not streaming.
- */
- if ((written_bytes != subbuffer.info.data.subbuf_size &&
- stream->net_seq_idx != (uint64_t) -1ULL) ||
- (written_bytes != subbuffer.info.data.padded_subbuf_size &&
- stream->net_seq_idx ==
- (uint64_t) -1ULL)) {
- /*
- * Display the error but continue processing to try to
- * release the subbuffer. This is a DBG statement
- * since this can happen without being a critical
- * error.
- */
- DBG("Failed to write to tracefile (written_bytes: %zd != padded subbuffer size: %lu, subbuffer size: %lu)",
- written_bytes, subbuffer.info.data.subbuf_size,
- subbuffer.info.data.padded_subbuf_size);
+ if (written_bytes <= 0) {
+ ERR("Error consuming subbuffer: (%zd)", written_bytes);
+ ret = (int) written_bytes;
+ goto error_put_subbuf;
}
ret = stream->read_subbuffer_ops.put_next_subbuffer(stream, &subbuffer);
goto end;
}
-stream_sleep:
+sleep_stream:
if (stream->read_subbuffer_ops.on_sleep) {
stream->read_subbuffer_ops.on_sleep(stream, ctx);
}