examples: use do/while loop for multi examples

It's conceivable that after the first time curl_multi_perform returns,
the outvalue still_running will be 0, but work will have been done. This
is shown by a workload of small, purely file:// based URLs. Ensure that
we always read pending messages off the multi handle by forcing the
while loop to run at least once.

5 files changed, 10 insertions, 10 deletions

diff --git a/docs/examples/multi-app.c b/docs/examples/multi-app.c
index 9615e67bf..a5f71c5ac 100644
--- a/docs/examples/multi-app.c
+++ b/docs/examples/multi-app.c
@@ -70,7 +70,7 @@ int main(void)
   /* we start some action by calling perform right away */
   curl_multi_perform(multi_handle, &still_running);
 
-  while(still_running) {
+  do {
     struct timeval timeout;
     int rc; /* select() return code */
 
@@ -118,7 +118,7 @@ int main(void)
       curl_multi_perform(multi_handle, &still_running);
       break;
     }
-  }
+  } while(still_running);
 
   /* See how the transfers went */
   while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
diff --git a/docs/examples/multi-debugcallback.c b/docs/examples/multi-debugcallback.c
index c7e819d03..8eedcee5b 100644
--- a/docs/examples/multi-debugcallback.c
+++ b/docs/examples/multi-debugcallback.c
@@ -144,7 +144,7 @@ int main(void)
   /* we start some action by calling perform right away */
   curl_multi_perform(multi_handle, &still_running);
 
-  while(still_running) {
+  do {
     struct timeval timeout;
     int rc; /* select() return code */
 
@@ -195,7 +195,7 @@ int main(void)
       curl_multi_perform(multi_handle, &still_running);
       break;
     }
-  }
+  } while(still_running);
 
   curl_multi_cleanup(multi_handle);
 
diff --git a/docs/examples/multi-double.c b/docs/examples/multi-double.c
index 120fde7b8..91422e6e2 100644
--- a/docs/examples/multi-double.c
+++ b/docs/examples/multi-double.c
@@ -59,7 +59,7 @@ int main(void)
   /* we start some action by calling perform right away */
   curl_multi_perform(multi_handle, &still_running);
 
-  while(still_running) {
+  do {
     struct timeval timeout;
     int rc; /* select() return code */
 
@@ -108,7 +108,7 @@ int main(void)
       curl_multi_perform(multi_handle, &still_running);
       break;
     }
-  }
+  } while(still_running);
 
   curl_multi_cleanup(multi_handle);
 
diff --git a/docs/examples/multi-post.c b/docs/examples/multi-post.c
index c26338b59..965a2c3f6 100644
--- a/docs/examples/multi-post.c
+++ b/docs/examples/multi-post.c
@@ -80,7 +80,7 @@ int main(void)
 
     curl_multi_perform(multi_handle, &still_running);
 
-    while(still_running) {
+    do {
       struct timeval timeout;
       int rc; /* select() return code */
 
@@ -131,7 +131,7 @@ int main(void)
         printf("running: %d!\n", still_running);
         break;
       }
-    }
+    } while(still_running);
 
     curl_multi_cleanup(multi_handle);
 
diff --git a/docs/examples/multi-single.c b/docs/examples/multi-single.c
index 0d3542706..aeda71419 100644
--- a/docs/examples/multi-single.c
+++ b/docs/examples/multi-single.c
@@ -55,7 +55,7 @@ int main(void)
   /* we start some action by calling perform right away */
   curl_multi_perform(multi_handle, &still_running);
 
-  while(still_running) {
+  do {
     struct timeval timeout;
     int rc; /* select() return code */
 
@@ -106,7 +106,7 @@ int main(void)
       curl_multi_perform(multi_handle, &still_running);
       break;
     }
-  }
+  } while(still_running);
 
   curl_multi_cleanup(multi_handle);