Add multi_curl handle to ALPM global context

To be able to run multiple download in parallel efficiently we need to
use curl_multi interface [1]. It introduces a set of APIs over new type
of handler 'CURLM'.

Create CURLM object at the application start and set it to global ALPM
context.

The 'single-download' CURL handle moves to payload struct. A new CURL
handle is created for each payload with intention to be processed by CURLM.

Note that curl_download_internal() is not ported to CURLM interface due
to the fact that the function will go away soon.

[1] https://curl.haxx.se/libcurl/c/libcurl-multi.html

Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/libalpm/dload.h b/lib/libalpm/dload.h
index 3eb7fbe1..65fcdadb 100644
--- a/lib/libalpm/dload.h
+++ b/lib/libalpm/dload.h
@@ -44,6 +44,7 @@ struct dload_payload {
 	int trust_remote_name;
 	int cb_initialized;
 #ifdef HAVE_LIBCURL
+	CURL *curl;
 	CURLcode curlerr;       /* last error produced by curl */
 #endif
 };