Local.hpp

   1 /* Cycript - The Truly Universal Scripting Language
   2  * Copyright (C) 2009-2016  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Affero General Public License, Version 3 {{{ */
   6 /*
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #ifndef CYCRIPT_LOCAL_HPP
  23 #define CYCRIPT_LOCAL_HPP
  24
  25 #include <pthread.h>
  26
  27 template <typename Type_>
  28 class CYLocal {
  29   private:
  30     static ::pthread_key_t key_;
  31
  32     Type_ *last_;
  33
  34   protected:
  35     static _finline void Set(Type_ *value) {
  36         _assert(::pthread_setspecific(key_, value) == 0);
  37     }
  38
  39     static ::pthread_key_t Key_() {
  40         ::pthread_key_t key;
  41         ::pthread_key_create(&key, NULL);
  42         return key;
  43     }
  44
  45   public:
  46     CYLocal(Type_ *next) {
  47         last_ = Get();
  48         Set(next);
  49     }
  50
  51     _finline ~CYLocal() {
  52         Set(last_);
  53     }
  54
  55     static _finline Type_ *Get() {
  56         return reinterpret_cast<Type_ *>(::pthread_getspecific(key_));
  57     }
  58 };
  59
  60 #endif/*CYCRIPT_LOCAL_HPP*/