text: /*
    Copyright 1999-2018 ImageMagick Studio LLC, a non-profit organization
    dedicated to making software imaging solutions freely available.
  
    You may not use this file except in compliance with the License.
    obtain a copy of the License at
  
      https://imagemagick.org/script/license.php
  
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
  
    MagickCore private methods for internal threading.
  */
  #ifndef MAGICKCORE_THREAD_PRIVATE_H
  #define MAGICKCORE_THREAD_PRIVATE_H
  
  #include "magick/cache.h"
  #include "magick/image-private.h"
  #include "magick/resource_.h"
  #include "magick/thread_.h"
  
  #if defined(__cplusplus) || defined(c_plusplus)
  extern "C" {
  #endif
  
  /*
    Number of threads bounded by the amount of work and any thread resource limit.
    The limit is 2 if the pixel cache type is not memory or memory-mapped.
  */
  #define magick_number_threads(source,destination,chunk,multithreaded) \
    num_threads((multithreaded) == 0 ? 1 : \
      ((GetImagePixelCacheType(source) != MemoryCache) && \
       (GetImagePixelCacheType(source) != MapCache)) || \
      ((GetImagePixelCacheType(destination) != MemoryCache) && \
       (GetImagePixelCacheType(destination) != MapCache)) ? \
      MagickMax(MagickMin(GetMagickResourceLimit(ThreadResource),2),1) : \
      MagickMax(MagickMin((ssize_t) GetMagickResourceLimit(ThreadResource),(ssize_t) (chunk)/64),1))
  
  #if defined(__clang__) || (__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ > 10))
  #define MagickCachePrefetch(address,mode,locality) \
    __builtin_prefetch(address,mode,locality)
  #else
  #define MagickCachePrefetch(address,mode,locality)
  #endif
  
  #if defined(MAGICKCORE_THREAD_SUPPORT)
    typedef pthread_mutex_t MagickMutexType;
  #elif defined(MAGICKCORE_WINDOWS_SUPPORT)
    typedef CRITICAL_SECTION MagickMutexType;
  #else
    typedef size_t MagickMutexType;
  #endif
  
  static inline MagickThreadType GetMagickThreadId(void)
  {
  #if defined(MAGICKCORE_THREAD_SUPPORT)
    return(pthread_self());
  #elif defined(MAGICKCORE_WINDOWS_SUPPORT)
    return(GetCurrentThreadId());
  #else
    return(getpid());
  #endif
  }
  
  static inline size_t GetMagickThreadSignature(void)
  {
  #if defined(MAGICKCORE_THREAD_SUPPORT)
    {
      union
      {
        pthread_t
          id;
  
        size_t
          signature;
      } magick_thread;
  
      magick_thread.signature=0UL;
      magick_thread.id=pthread_self();
      return(magick_thread.signature);
    }
  #elif defined(MAGICKCORE_WINDOWS_SUPPORT)
    return((size_t) GetCurrentThreadId());
  #else
    return((size_t) getpid());
  #endif
  }
  
  static inline MagickBooleanType IsMagickThreadEqual(const MagickThreadType id)
  {
  #if defined(MAGICKCORE_THREAD_SUPPORT)
    if (pthread_equal(id,pthread_self()) != 0)
      return(MagickTrue);
  #elif defined(MAGICKCORE_WINDOWS_SUPPORT)
    if (id == GetCurrentThreadId())
      return(MagickTrue);
  #else
    if (id == getpid())
      return(MagickTrue);
  #endif
    return(MagickFalse);
  }
  
  /*
    Lightweight OpenMP methods.
  */
  static inline size_t GetOpenMPMaximumThreads(void)
  {
  #if defined(MAGICKCORE_OPENMP_SUPPORT)
    return(omp_get_max_threads());
  #else
    return(1);
  #endif
  }
  
  static inline int GetOpenMPThreadId(void)
  {
  #if defined(MAGICKCORE_OPENMP_SUPPORT)
    return(omp_get_thread_num());
  #else
    return(0);
  #endif
  }
  
  static inline void SetOpenMPMaximumThreads(const int threads)
  {
  #if defined(MAGICKCORE_OPENMP_SUPPORT)
    omp_set_num_threads(threads);
  #else
    (void) threads;
  #endif
  }
  
  static inline void SetOpenMPNested(const int value)
  {
  #if defined(MAGICKCORE_OPENMP_SUPPORT)
    omp_set_nested(value);
  #else
    (void) value;
  #endif
  }
  
  #if defined(__cplusplus) || defined(c_plusplus)
  }
  #endif
  
  #endif
  