From 215baa74f709cd5026ea037eb9204cee93baa1bb Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 17 Oct 2019 10:05:53 +0200
Subject: curl: add --parallel-immediate

Starting with this change when doing parallel transfers, without this
option set, curl will prefer to create new transfers multiplexed on an
existing connection rather than creating a brand new one.

--parallel-immediate can be set to tell curl to prefer to use new
connections rather than to wait and try to multiplex.

libcurl-wise, this means that curl will set CURLOPT_PIPEWAIT by default
on parallel transfers.

Suggested-by: Tom van der Woerdt
Closes #4500
---
 src/tool_cfgable.h  | 1 +
 src/tool_getparam.c | 4 ++++
 src/tool_help.c     | 2 ++
 src/tool_operate.c  | 4 ++++
 4 files changed, 11 insertions(+)

(limited to 'src')

diff --git a/src/tool_cfgable.h b/src/tool_cfgable.h
index 7232c35e3..4372cc6fc 100644
--- a/src/tool_cfgable.h
+++ b/src/tool_cfgable.h
@@ -300,6 +300,7 @@ struct GlobalConfig {
 #endif
   bool parallel;
   long parallel_max;
+  bool parallel_connect;
   struct OperationConfig *first;
   struct OperationConfig *current;
   struct OperationConfig *last;   /* Always last in the struct */
diff --git a/src/tool_getparam.c b/src/tool_getparam.c
index 3882cb97e..75faff34d 100644
--- a/src/tool_getparam.c
+++ b/src/tool_getparam.c
@@ -321,6 +321,7 @@ static const struct LongShort aliases[]= {
   {"z",  "time-cond",                ARG_STRING},
   {"Z",  "parallel",                 ARG_BOOL},
   {"Zb", "parallel-max",             ARG_STRING},
+  {"Zc", "parallel-immediate",       ARG_BOOL},
   {"#",  "progress-bar",             ARG_BOOL},
   {"#m", "progress-meter",           ARG_BOOL},
   {":",  "next",                     ARG_NONE},
@@ -2154,6 +2155,9 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
            (global->parallel_max < 1))
           global->parallel_max = PARALLEL_DEFAULT;
         break;
+      case 'c':   /* --parallel-connect */
+        global->parallel_connect = toggle;
+        break;
       }
       break;
     case 'z': /* time condition coming up */
diff --git a/src/tool_help.c b/src/tool_help.c
index 022956676..21900108b 100644
--- a/src/tool_help.c
+++ b/src/tool_help.c
@@ -279,6 +279,8 @@ static const struct helptxt helptext[] = {
    "Write to file instead of stdout"},
   {"-Z, --parallel",
    "Perform transfers in parallel"},
+  {"    --parallel-immediate",
+   "Do not wait for multiplexing (with --parallel)"},
   {"    --parallel-max",
    "Maximum concurrency for parallel transfers"},
   {"    --pass <phrase>",
diff --git a/src/tool_operate.c b/src/tool_operate.c
index 4ecb1ed5f..0de81cd49 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -1976,6 +1976,10 @@ static CURLcode add_parallel_transfers(struct GlobalConfig *global,
     if(result)
       break;
 
+    /* parallel connect means that we don't set PIPEWAIT since pipewait
+       will make libcurl prefer multiplexing */
+    (void)curl_easy_setopt(per->curl, CURLOPT_PIPEWAIT,
+                           global->parallel_connect ? 0L : 1L);
     (void)curl_easy_setopt(per->curl, CURLOPT_PRIVATE, per);
     (void)curl_easy_setopt(per->curl, CURLOPT_XFERINFOFUNCTION, xferinfo_cb);
     (void)curl_easy_setopt(per->curl, CURLOPT_XFERINFODATA, per);
-- 
cgit v1.2.3