1/*
2  Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization
3  dedicated to making software imaging solutions freely available.
4
5  You may not use this file except in compliance with the License.
6  obtain a copy of the License at
7
8    http://www.imagemagick.org/script/license.php
9
10  Unless required by applicable law or agreed to in writing, software
11  distributed under the License is distributed on an "AS IS" BASIS,
12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  See the License for the specific language governing permissions and
14  limitations under the License.
15
16  MagickCore private methods for internal threading.
17*/
18#ifndef MAGICKCORE_THREAD_PRIVATE_H
19#define MAGICKCORE_THREAD_PRIVATE_H
20
21#include "MagickCore/cache.h"
22#include "MagickCore/resource_.h"
23#include "MagickCore/thread_.h"
24
25#if defined(__cplusplus) || defined(c_plusplus)
26extern "C" {
27#endif
28
29/*
30  Single threaded unless workload justifies the threading overhead.
31*/
32#define magick_threads(source,destination,chunk,expression) \
33  num_threads((expression) == 0 ? 1 : \
34    ((chunk) > (32*GetMagickResourceLimit(ThreadResource))) && \
35     ((GetImagePixelCacheType(source) == MemoryCache) || \
36      (GetImagePixelCacheType(source) == MapCache)) && \
37     ((GetImagePixelCacheType(destination) == MemoryCache) || \
38      (GetImagePixelCacheType(destination) == MapCache)) ? \
39      GetMagickResourceLimit(ThreadResource) : \
40      GetMagickResourceLimit(ThreadResource) < 2 ? 1 : 2)
41
42#if defined(__clang__) || (__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ > 10))
43#define MagickCachePrefetch(address,mode,locality) \
44  __builtin_prefetch(address,mode,locality)
45#else
46#define MagickCachePrefetch(address,mode,locality) \
47  magick_unreferenced(address); \
48  magick_unreferenced(mode); \
49  magick_unreferenced(locality);
50#endif
51
52#if defined(MAGICKCORE_THREAD_SUPPORT)
53  typedef pthread_mutex_t MagickMutexType;
54#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
55  typedef CRITICAL_SECTION MagickMutexType;
56#else
57  typedef size_t MagickMutexType;
58#endif
59
60static inline MagickThreadType GetMagickThreadId(void)
61{
62#if defined(MAGICKCORE_THREAD_SUPPORT)
63  return(pthread_self());
64#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
65  return(GetCurrentThreadId());
66#else
67  return(getpid());
68#endif
69}
70
71static inline size_t GetMagickThreadSignature(void)
72{
73#if defined(MAGICKCORE_THREAD_SUPPORT)
74  {
75    union
76    {
77      pthread_t
78        id;
79
80      size_t
81        signature;
82    } magick_thread;
83
84    magick_thread.signature=0UL;
85    magick_thread.id=pthread_self();
86    return(magick_thread.signature);
87  }
88#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
89  return((size_t) GetCurrentThreadId());
90#else
91  return((size_t) getpid());
92#endif
93}
94
95static inline MagickBooleanType IsMagickThreadEqual(const MagickThreadType id)
96{
97#if defined(MAGICKCORE_THREAD_SUPPORT)
98  if (pthread_equal(id,pthread_self()) != 0)
99    return(MagickTrue);
100#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
101  if (id == GetCurrentThreadId())
102    return(MagickTrue);
103#else
104  if (id == getpid())
105    return(MagickTrue);
106#endif
107  return(MagickFalse);
108}
109
110/*
111  Lightweight OpenMP methods.
112*/
113static inline size_t GetOpenMPMaximumThreads(void)
114{
115#if defined(MAGICKCORE_OPENMP_SUPPORT)
116  return(omp_get_max_threads());
117#else
118  return(1);
119#endif
120}
121
122static inline int GetOpenMPThreadId(void)
123{
124#if defined(MAGICKCORE_OPENMP_SUPPORT)
125  return(omp_get_thread_num());
126#else
127  return(0);
128#endif
129}
130
131static inline void SetOpenMPMaximumThreads(const int threads)
132{
133#if defined(MAGICKCORE_OPENMP_SUPPORT)
134  omp_set_num_threads(threads);
135#else
136  (void) threads;
137#endif
138}
139
140static inline void SetOpenMPNested(const int value)
141{
142#if defined(MAGICKCORE_OPENMP_SUPPORT)
143  omp_set_nested(value);
144#else
145  (void) value;
146#endif
147}
148
149#if defined(__cplusplus) || defined(c_plusplus)
150}
151#endif
152
153#endif
154