[gnurl] 25/151: multi_poll: avoid busy-loop when called without easy handles attached

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commit 4e1eee1500202a6a21fbedbd6e84d0e6c9af4b50
Author: Daniel Stenberg <address@hidden>
AuthorDate: Thu Nov 14 15:11:23 2019 +0100

    multi_poll: avoid busy-loop when called without easy handles attached
    
    Fixes #4594
    Closes #4595
    Reported-by: 3dyd on github
---
 lib/multi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/multi.c b/lib/multi.c
index 7e8e38dc9..a0de107f0 100755
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -1157,6 +1157,10 @@ static CURLMcode Curl_multi_wait(struct Curl_multi 
*multi,
     if(!curl_multi_timeout(multi, &sleep_ms) && sleep_ms) {
       if(sleep_ms > timeout_ms)
         sleep_ms = timeout_ms;
+      /* when there are no easy handles in the multi, this holds a -1
+         timeout */
+      else if((sleep_ms < 0) && extrawait)
+        sleep_ms = timeout_ms;
       Curl_wait_ms((int)sleep_ms);
     }
   }

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