un-nest curl

curl-8.15.0/docs/examples/shared-connection-cache.c

@@ -0,0 +1,87 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+/* <DESC>
+ * Connection cache shared between easy handles with the share interface
+ * </DESC>
+ */
+#include <stdio.h>
+#include <curl/curl.h>
+
+static void my_lock(CURL *handle, curl_lock_data data,
+                    curl_lock_access laccess, void *useptr)
+{
+  (void)handle;
+  (void)data;
+  (void)laccess;
+  (void)useptr;
+  fprintf(stderr, "-> Mutex lock\n");
+}
+
+static void my_unlock(CURL *handle, curl_lock_data data, void *useptr)
+{
+  (void)handle;
+  (void)data;
+  (void)useptr;
+  fprintf(stderr, "<- Mutex unlock\n");
+}
+
+int main(void)
+{
+  CURLSH *share;
+  int i;
+
+  share = curl_share_init();
+  curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_CONNECT);
+
+  curl_share_setopt(share, CURLSHOPT_LOCKFUNC, my_lock);
+  curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, my_unlock);
+
+  /* Loop the transfer and cleanup the handle properly every lap. This still
+     reuses connections since the pool is in the shared object! */
+
+  for(i = 0; i < 3; i++) {
+    CURL *curl = curl_easy_init();
+    if(curl) {
+      CURLcode res;
+
+      curl_easy_setopt(curl, CURLOPT_URL, "https://curl.se/");
+
+      /* use the share object */
+      curl_easy_setopt(curl, CURLOPT_SHARE, share);
+
+      /* Perform the request, res gets the return code */
+      res = curl_easy_perform(curl);
+      /* Check for errors */
+      if(res != CURLE_OK)
+        fprintf(stderr, "curl_easy_perform() failed: %s\n",
+                curl_easy_strerror(res));
+
+      /* always cleanup */
+      curl_easy_cleanup(curl);
+    }
+  }
+
+  curl_share_cleanup(share);
+  return 0;
+}