example using multiple threads to get URLs

docs/examples/multithread.c

@@ -0,0 +1,70 @@
+/*****************************************************************************
+ *                                  _   _ ____  _     
+ *  Project                     ___| | | |  _ \| |    
+ *                             / __| | | | |_) | |    
+ *                            | (__| |_| |  _ <| |___ 
+ *                             \___|\___/|_| \_\_____|
+ *
+ * $Id$
+ */
+
+/* A multi-threaded example that uses pthreads extensively to fetch
+ * X remote files at once */
+
+#include <stdio.h>
+#include <pthread.h>
+#include <curl/curl.h>
+
+/* silly list of test-URLs */
+char *urls[]= {
+  "http://curl.haxx.se/",
+  "ftp://cool.haxx.se/",
+  "http://www.contactor.se/",
+  "www.haxx.se"
+};
+
+void *pull_one_url(void *url)
+{
+  CURL *curl;
+
+  curl = curl_easy_init();
+
+  curl_easy_setopt(curl, CURLOPT_URL, url);
+  curl_easy_perform(curl);
+
+  curl_easy_cleanup(curl);
+
+  return NULL;
+}
+
+
+/* 
+   int pthread_create(pthread_t *new_thread_ID,
+   const pthread_attr_t *attr,
+   void * (*start_func)(void *), void *arg);
+*/
+
+int main(int argc, char **argv)
+{
+  pthread_t tid[4];
+  int i;
+  int error;
+  for(i=0; i< 4; i++) {
+    error = pthread_create(&tid[i],
+                           NULL, /* default attributes please */
+                           pull_one_url,
+                           urls[i]);
+    if(0 != error)
+      fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
+    else 
+      fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
+  }
+
+  /* now wait for all threads to terminate */
+  for(i=0; i< 4; i++) {
+    error = pthread_join(tid[i], NULL);
+    fprintf(stderr, "Thread %d terminated\n", i);
+  }
+
+  return 0;
+}