hostcache: made all host caches use structs, not pointers

This avoids unnecessary dynamic allocs and as this also removed the last
users of *hash_alloc() and *hash_destroy(), those two functions are now
removed.

9 files changed, 24 insertions, 76 deletions

diff --git a/lib/hash.c b/lib/hash.c
index af2887758..b1aebd5b8 100644
--- a/lib/hash.c
+++ b/lib/hash.c
@@ -89,32 +89,6 @@ Curl_hash_init(struct curl_hash *h,
   }
 }
 
-struct curl_hash *
-Curl_hash_alloc(int slots,
-                hash_function hfunc,
-                comp_function comparator,
-                curl_hash_dtor dtor)
-{
-  struct curl_hash *h;
-
-  if(!slots || !hfunc || !comparator ||!dtor) {
-    return NULL; /* failure */
-  }
-
-  h = malloc(sizeof(struct curl_hash));
-  if(h) {
-    if(Curl_hash_init(h, slots, hfunc, comparator, dtor)) {
-      /* failure */
-      free(h);
-      h = NULL;
-    }
-  }
-
-  return h;
-}
-
-
-
 static struct curl_hash_element *
 mk_hash_element(const void *key, size_t key_len, const void *p)
 {
@@ -281,17 +255,6 @@ Curl_hash_clean_with_criterium(struct curl_hash *h, void *user,
   }
 }
 
-void
-Curl_hash_destroy(struct curl_hash *h)
-{
-  if(!h)
-    return;
-
-  Curl_hash_clean(h);
-
-  free(h);
-}
-
 size_t Curl_hash_str(void* key, size_t key_length, size_t slots_num)
 {
   const char* key_str = (const char *) key;
diff --git a/lib/hash.h b/lib/hash.h
index aa935d4eb..bc7c20dec 100644
--- a/lib/hash.h
+++ b/lib/hash.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2015, 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
@@ -74,11 +74,6 @@ int Curl_hash_init(struct curl_hash *h,
                    comp_function comparator,
                    curl_hash_dtor dtor);
 
-struct curl_hash *Curl_hash_alloc(int slots,
-                                  hash_function hfunc,
-                                  comp_function comparator,
-                                  curl_hash_dtor dtor);
-
 void *Curl_hash_add(struct curl_hash *h, void *key, size_t key_len, void *p);
 int Curl_hash_delete(struct curl_hash *h, void *key, size_t key_len);
 void *Curl_hash_pick(struct curl_hash *, void * key, size_t key_len);
@@ -88,8 +83,6 @@ int Curl_hash_count(struct curl_hash *h);
 void Curl_hash_clean(struct curl_hash *h);
 void Curl_hash_clean_with_criterium(struct curl_hash *h, void *user,
                                     int (*comp)(void *, void *));
-void Curl_hash_destroy(struct curl_hash *h);
-
 size_t Curl_hash_str(void* key, size_t key_length, size_t slots_num);
 size_t Curl_str_key_compare(void*k1, size_t key1_len, void*k2,
                             size_t key2_len);
diff --git a/lib/hostip.c b/lib/hostip.c
index 764e78026..338cf2de6 100644
--- a/lib/hostip.c
+++ b/lib/hostip.c
@@ -742,11 +742,12 @@ static void freednsentry(void *freethis)
 }
 
 /*
- * Curl_mk_dnscache() creates a new DNS cache and returns the handle for it.
+ * Curl_mk_dnscache() inits a new DNS cache and returns success/failure.
  */
-struct curl_hash *Curl_mk_dnscache(void)
+int Curl_mk_dnscache(struct curl_hash *hash)
 {
-  return Curl_hash_alloc(7, Curl_hash_str, Curl_str_key_compare, freednsentry);
+  return Curl_hash_init(hash, 7, Curl_hash_str, Curl_str_key_compare,
+                        freednsentry);
 }
 
 /*
diff --git a/lib/hostip.h b/lib/hostip.h
index a79b89a44..d5b44bc9e 100644
--- a/lib/hostip.h
+++ b/lib/hostip.h
@@ -124,8 +124,8 @@ void Curl_resolv_unlock(struct SessionHandle *data,
 /* for debugging purposes only: */
 void Curl_scan_cache_used(void *user, void *ptr);
 
-/* make a new dns cache and return the handle */
-struct curl_hash *Curl_mk_dnscache(void);
+/* init a new dns cache and return success */
+int Curl_mk_dnscache(struct curl_hash *hash);
 
 /* prune old entries from the DNS cache */
 void Curl_hostcache_prune(struct SessionHandle *data);
diff --git a/lib/multi.c b/lib/multi.c
index c1467ad4d..bd16f9462 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -294,8 +294,7 @@ struct Curl_multi *Curl_multi_handle(int hashsize, /* socket hash */
 
   multi->type = CURL_MULTI_HANDLE;
 
-  multi->hostcache = Curl_mk_dnscache();
-  if(!multi->hostcache)
+  if(Curl_mk_dnscache(&multi->hostcache))
     goto error;
 
   if(sh_init(&multi->sockhash, hashsize))
@@ -329,8 +328,7 @@ struct Curl_multi *Curl_multi_handle(int hashsize, /* socket hash */
   error:
 
   Curl_hash_clean(&multi->sockhash);
-  Curl_hash_destroy(multi->hostcache);
-  multi->hostcache = NULL;
+  Curl_hash_clean(&multi->hostcache);
   Curl_conncache_destroy(&multi->conn_cache);
   Curl_close(multi->closure_handle);
   multi->closure_handle = NULL;
@@ -400,7 +398,7 @@ CURLMcode curl_multi_add_handle(CURLM *multi_handle,
      easy handle's one is currently not set. */
   else if(!data->dns.hostcache ||
      (data->dns.hostcachetype == HCACHE_NONE)) {
-    data->dns.hostcache = multi->hostcache;
+    data->dns.hostcache = &multi->hostcache;
     data->dns.hostcachetype = HCACHE_MULTI;
   }
 
@@ -1861,7 +1859,7 @@ CURLMcode curl_multi_cleanup(CURLM *multi_handle)
       sigpipe_ignore(multi->closure_handle, &pipe_st);
       restore_pipe = TRUE;
 
-      multi->closure_handle->dns.hostcache = multi->hostcache;
+      multi->closure_handle->dns.hostcache = &multi->hostcache;
       Curl_hostcache_clean(multi->closure_handle,
                            multi->closure_handle->dns.hostcache);
 
@@ -1891,7 +1889,7 @@ CURLMcode curl_multi_cleanup(CURLM *multi_handle)
       data = nextdata;
     }
 
-    Curl_hash_destroy(multi->hostcache);
+    Curl_hash_clean(&multi->hostcache);
 
     /* Free the blacklists by setting them to NULL */
     Curl_pipeline_set_site_blacklist(NULL, &multi->pipelining_site_bl);
diff --git a/lib/multihandle.h b/lib/multihandle.h
index 1ef28c9d6..640e3fb4b 100644
--- a/lib/multihandle.h
+++ b/lib/multihandle.h
@@ -86,7 +86,7 @@ struct Curl_multi {
   void *socket_userp;
 
   /* Hostname cache */
-  struct curl_hash *hostcache;
+  struct curl_hash hostcache;
 
   /* timetree points to the splay-tree of time nodes to figure out expire
      times of all currently set timers */
diff --git a/lib/share.c b/lib/share.c
index 3fc53119e..b61a86bc2 100644
--- a/lib/share.c
+++ b/lib/share.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2015, 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
@@ -38,6 +38,11 @@ curl_share_init(void)
   if(share)
     share->specifier |= (1<<CURL_LOCK_DATA_SHARE);
 
+  if(Curl_mk_dnscache(&share->hostcache)) {
+    free(share);
+    return NULL;
+  }
+
   return share;
 }
 
@@ -67,11 +72,6 @@ curl_share_setopt(CURLSH *sh, CURLSHoption option, ...)
     share->specifier |= (1<<type);
     switch( type ) {
     case CURL_LOCK_DATA_DNS:
-      if(!share->hostcache) {
-        share->hostcache = Curl_mk_dnscache();
-        if(!share->hostcache)
-          res = CURLSHE_NOMEM;
-      }
       break;
 
     case CURL_LOCK_DATA_COOKIE:
@@ -115,10 +115,6 @@ curl_share_setopt(CURLSH *sh, CURLSHoption option, ...)
     share->specifier &= ~(1<<type);
     switch( type ) {
     case CURL_LOCK_DATA_DNS:
-      if(share->hostcache) {
-        Curl_hash_destroy(share->hostcache);
-        share->hostcache = NULL;
-      }
       break;
 
     case CURL_LOCK_DATA_COOKIE:
@@ -192,10 +188,7 @@ curl_share_cleanup(CURLSH *sh)
     return CURLSHE_IN_USE;
   }
 
-  if(share->hostcache) {
-    Curl_hash_destroy(share->hostcache);
-    share->hostcache = NULL;
-  }
+  Curl_hash_clean(&share->hostcache);
 
 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
   Curl_cookie_cleanup(share->cookies);
diff --git a/lib/share.h b/lib/share.h
index 9a5128e93..8e6629b7b 100644
--- a/lib/share.h
+++ b/lib/share.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2015, 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
@@ -44,7 +44,7 @@ struct Curl_share {
   curl_unlock_function unlockfunc;
   void *clientdata;
 
-  struct curl_hash *hostcache;
+  struct curl_hash hostcache;
 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
   struct CookieInfo *cookies;
 #endif
diff --git a/lib/url.c b/lib/url.c
index c99066074..20b802ad1 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2187,9 +2187,9 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
 
       data->share->dirty++;
 
-      if(data->share->hostcache) {
+      if(data->share->specifier & (1<< CURL_LOCK_DATA_DNS)) {
         /* use shared host cache */
-        data->dns.hostcache = data->share->hostcache;
+        data->dns.hostcache = &data->share->hostcache;
         data->dns.hostcachetype = HCACHE_SHARED;
       }
 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)