input_curl: use select() to eliminate busy loop during connect

When decoder_run_song() (decoder_thread.c) waits for the input stream to become ready, it did that in a busy loop. Add a select() call to input_curl_buffer() during connect/handshake (i.e. before the first chunk of body data was received), to let the CPU relax.

input_curl: use select() to eliminate busy loop during connect
e7c7e652 · Max Kellermann · d82061b7 · e7c7e652
Commit e7c7e652 authored Jan 13, 2009 by Max Kellermann
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input_curl.c src/input_curl.c +6 -0

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--- a/src/input_curl.c
+++ b/src/input_curl.c
@@ -470,6 +470,12 @@ input_curl_buffer(struct input_stream *is)

 	c->buffered = false;

+	if (!is->ready)
+		/* not ready yet means the caller is waiting in a busy
+		   loop; relax that by calling select() on the
+		   socket */
+		input_curl_select(c);
+
 	do {
 		mcode = curl_multi_perform(c->multi, &running_handles);
 	} while (mcode == CURLM_CALL_MULTI_PERFORM &&