Thread-safety fixes
[openssl.git] / ssl / ssl_ciph.c
index 6bf337b..5453037 100644 (file)
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
+/* ====================================================================
+ * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
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+ *    distribution.
+ *
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+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
 /* ====================================================================
  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  * ECC cipher suite support in OpenSSL originally developed by 
@@ -243,36 +296,46 @@ static int sk_comp_cmp(const SSL_COMP * const *a,
 
 static void load_builtin_compressions(void)
        {
-       if (ssl_comp_methods != NULL)
-               return;
+       int got_write_lock = 0;
 
-       CRYPTO_w_lock(CRYPTO_LOCK_SSL);
+       CRYPTO_r_lock(CRYPTO_LOCK_SSL);
        if (ssl_comp_methods == NULL)
                {
-               SSL_COMP *comp = NULL;
-
-               MemCheck_off();
-               ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
-               if (ssl_comp_methods != NULL)
+               CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
+               CRYPTO_w_lock(CRYPTO_LOCK_SSL);
+               got_write_lock = 1;
+               
+               if (ssl_comp_methods == NULL)
                        {
-                       comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
-                       if (comp != NULL)
+                       SSL_COMP *comp = NULL;
+
+                       MemCheck_off();
+                       ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
+                       if (ssl_comp_methods != NULL)
                                {
-                               comp->method=COMP_zlib();
-                               if (comp->method
-                                       && comp->method->type == NID_undef)
-                                       OPENSSL_free(comp);
-                               else
+                               comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
+                               if (comp != NULL)
                                        {
-                                       comp->id=SSL_COMP_ZLIB_IDX;
-                                       comp->name=comp->method->name;
-                                       sk_SSL_COMP_push(ssl_comp_methods,comp);
+                                       comp->method=COMP_zlib();
+                                       if (comp->method
+                                               && comp->method->type == NID_undef)
+                                               OPENSSL_free(comp);
+                                       else
+                                               {
+                                               comp->id=SSL_COMP_ZLIB_IDX;
+                                               comp->name=comp->method->name;
+                                               sk_SSL_COMP_push(ssl_comp_methods,comp);
+                                               }
                                        }
                                }
+                       MemCheck_on();
                        }
-               MemCheck_on();
                }
-       CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
+       
+       if (got_write_lock)
+               CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
+       else
+               CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
        }
 #endif