text: /*
      Copyright 2005-2014 Intel Corporation.  All Rights Reserved.
  
      The source code contained or described herein and all documents related
      to the source code ("Material") are owned by Intel Corporation or its
      suppliers or licensors.  Title to the Material remains with Intel
      Corporation or its suppliers and licensors.  The Material is protected
      by worldwide copyright laws and treaty provisions.  No part of the
      Material may be used, copied, reproduced, modified, published, uploaded,
      posted, transmitted, distributed, or disclosed in any way without
      Intel's prior express written permission.
  
      No license under any patent, copyright, trade secret or other
      intellectual property right is granted to or conferred upon you by
      disclosure or delivery of the Materials, either expressly, by
      implication, inducement, estoppel or otherwise.  Any license under such
      intellectual property rights must be express and approved by Intel in
      writing.
  */
  
  #ifndef _TBB_CRITICAL_SECTION_H_
  #define _TBB_CRITICAL_SECTION_H_
  
  #if _WIN32||_WIN64
  #include "machine/windows_api.h"
  #else
  #include <pthread.h>
  #include <errno.h>
  #endif  // _WIN32||WIN64
  
  #include "tbb_stddef.h"
  #include "tbb_thread.h"
  #include "tbb_exception.h"
  
  #include "tbb_profiling.h"
  
  namespace tbb {
  
      namespace internal {
  class critical_section_v4 : internal::no_copy {
  #if _WIN32||_WIN64
      CRITICAL_SECTION my_impl;
  #else
      pthread_mutex_t my_impl;
  #endif
      tbb_thread::id my_tid;
  public:
  
      void __TBB_EXPORTED_METHOD internal_construct();
  
      critical_section_v4() { 
  #if _WIN32||_WIN64
          InitializeCriticalSectionEx( &my_impl, 4000, 0 );
  #else
          pthread_mutex_init(&my_impl, NULL);
  #endif
          internal_construct();
      }
  
      ~critical_section_v4() {
          __TBB_ASSERT(my_tid == tbb_thread::id(), "Destroying a still-held critical section");
  #if _WIN32||_WIN64
          DeleteCriticalSection(&my_impl); 
  #else
          pthread_mutex_destroy(&my_impl);
  #endif
      }
  
      class scoped_lock : internal::no_copy {
      private:
          critical_section_v4 &my_crit;
      public:
          scoped_lock( critical_section_v4& lock_me) :my_crit(lock_me) {
              my_crit.lock();
          }
  
          ~scoped_lock() {
              my_crit.unlock();
          }
      };
  
      void lock() { 
          tbb_thread::id local_tid = this_tbb_thread::get_id();
          if(local_tid == my_tid) throw_exception( eid_improper_lock );
  #if _WIN32||_WIN64
          EnterCriticalSection( &my_impl );
  #else
          int rval = pthread_mutex_lock(&my_impl);
          __TBB_ASSERT_EX(!rval, "critical_section::lock: pthread_mutex_lock failed");
  #endif
          __TBB_ASSERT(my_tid == tbb_thread::id(), NULL);
          my_tid = local_tid;
      }
  
      bool try_lock() {
          bool gotlock;
          tbb_thread::id local_tid = this_tbb_thread::get_id();
          if(local_tid == my_tid) return false;
  #if _WIN32||_WIN64
          gotlock = TryEnterCriticalSection( &my_impl ) != 0;
  #else
          int rval = pthread_mutex_trylock(&my_impl);
          // valid returns are 0 (locked) and [EBUSY]
          __TBB_ASSERT(rval == 0 || rval == EBUSY, "critical_section::trylock: pthread_mutex_trylock failed");
          gotlock = rval == 0;
  #endif
          if(gotlock)  {
              my_tid = local_tid;
          }
          return gotlock;
      }
  
      void unlock() {
          __TBB_ASSERT(this_tbb_thread::get_id() == my_tid, "thread unlocking critical_section is not thread that locked it");
          my_tid = tbb_thread::id();
  #if _WIN32||_WIN64
          LeaveCriticalSection( &my_impl );
  #else
          int rval = pthread_mutex_unlock(&my_impl);
          __TBB_ASSERT_EX(!rval, "critical_section::unlock: pthread_mutex_unlock failed");
  #endif
      }
  
      static const bool is_rw_mutex = false;
      static const bool is_recursive_mutex = false;
      static const bool is_fair_mutex = true;
  }; // critical_section_v4
  } // namespace internal
  typedef internal::critical_section_v4 critical_section;
  
  __TBB_DEFINE_PROFILING_SET_NAME(critical_section)
  } // namespace tbb
  #endif  // _TBB_CRITICAL_SECTION_H_
  