MagickCore 7.1.2
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thread.c
1/*
2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3% %
4% %
5% TTTTT H H RRRR EEEEE AAA DDDD %
6% T H H R R E A A D D %
7% T HHHHH RRRR EEE AAAAA D D %
8% T H H R R E A A D D %
9% T H H R R EEEEE A A DDDD %
10% %
11% %
12% MagickCore Thread Methods %
13% %
14% Software Design %
15% Cristy %
16% March 2003 %
17% %
18% %
19% Copyright @ 1999 ImageMagick Studio LLC, a non-profit organization %
20% dedicated to making software imaging solutions freely available. %
21% %
22% You may not use this file except in compliance with the License. You may %
23% obtain a copy of the License at %
24% %
25% https://imagemagick.org/script/license.php %
26% %
27% Unless required by applicable law or agreed to in writing, software %
28% distributed under the License is distributed on an "AS IS" BASIS, %
29% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
30% See the License for the specific language governing permissions and %
31% limitations under the License. %
32% %
33%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
34%
35%
36*/
37␌
38/*
39 Include declarations.
40*/
41#include "MagickCore/studio.h"
42#include "MagickCore/memory_.h"
43#include "MagickCore/thread_.h"
44#include "MagickCore/thread-private.h"
45␌
46/*
47 Typedef declarations.
48*/
49typedef struct _MagickThreadValue
50{
51 size_t
52 number_threads;
53
54 void
55 **values,
56 (*destructor)(void *);
57} MagickThreadValue;
58␌
59/*
60%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
61% %
62% %
63% %
64% C r e a t e M a g i c k T h r e a d K e y %
65% %
66% %
67% %
68%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
69%
70% CreateMagickThreadKey() creates a thread-specific data key visible to all
71% threads in the process.
72%
73% The format of the CreateMagickThreadKey method is:
74%
75% MagickThreadKey CreateMagickThreadKey(MagickThreadKey *key)
76%
77% A description of each parameter follows:
78%
79% o key: opaque objects used to locate thread-specific data.
80%
81% o destructor: associate an optional destructor with each key value.
82%
83*/
84MagickExport MagickBooleanType CreateMagickThreadKey(MagickThreadKey *key,
85 void (*destructor)(void *))
86{
87#if defined(MAGICKCORE_THREAD_SUPPORT)
88 return(pthread_key_create(key,destructor) == 0 ? MagickTrue : MagickFalse);
89#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
90 magick_unreferenced(destructor);
91 *key=TlsAlloc();
92 return(*key != TLS_OUT_OF_INDEXES ? MagickTrue : MagickFalse);
93#else
94 {
95 MagickThreadValue
96 **keys;
97
98 keys=(MagickThreadValue **) key;
99 *keys=(MagickThreadValue *) AcquireMagickMemory(sizeof(**keys));
100 if (*keys != (MagickThreadValue *) NULL)
101 {
102 (*keys)->number_threads=GetOpenMPMaximumThreads();
103 (*keys)->values=(void **) AcquireQuantumMemory((*keys)->number_threads,
104 sizeof(void *));
105 if ((*keys)->values == (void **) NULL)
106 *keys=(MagickThreadValue *) RelinquishMagickMemory(*keys);
107 else
108 (void) memset((*keys)->values,0,(*keys)->number_threads*
109 sizeof(void *));
110 (*keys)->destructor=destructor;
111 }
112 return((*keys != (MagickThreadValue *) NULL) ? MagickTrue : MagickFalse);
113 }
114#endif
115}
116␌
117/*
118%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
119% %
120% %
121% %
122% D e l e t e M a g i c k T h r e a d K e y %
123% %
124% %
125% %
126%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
127%
128% DeleteMagickThreadKey() deletes a thread-specific data key.
129%
130% The format of the DeleteMagickThreadKey method is:
131%
132% MagickBooleanType DeleteMagickThreadKey(MagickThreadKey key)
133%
134% A description of each parameter follows:
135%
136% o key: the thread key.
137%
138*/
139MagickExport MagickBooleanType DeleteMagickThreadKey(MagickThreadKey key)
140{
141#if defined(MAGICKCORE_THREAD_SUPPORT)
142 return(pthread_key_delete(key) == 0 ? MagickTrue : MagickFalse);
143#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
144 return(TlsFree(key) != 0 ? MagickTrue : MagickFalse);
145#else
146 {
147 MagickThreadValue
148 *keys;
149
150 ssize_t
151 i;
152
153 keys=(MagickThreadValue *) key;
154 for (i=0; i < (ssize_t) keys->number_threads; i++)
155 if ((keys->destructor != (void *) NULL) &&
156 (keys->values[i] != (void *) NULL))
157 {
158 keys->destructor(keys->values[i]);
159 keys->values[i]=(void *) NULL;
160 }
161 keys=(MagickThreadValue *) RelinquishMagickMemory(keys);
162 }
163 return(MagickTrue);
164#endif
165}
166␌
167/*
168%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
169% %
170% %
171% %
172% G e t M a g i c k T h r e a d V a l u e %
173% %
174% %
175% %
176%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
177%
178% GetMagickThreadValue() returns the value currently bound to the specified
179% key on behalf of the calling thread.
180%
181% The format of the GetMagickThreadValue method is:
182%
183% void *GetMagickThreadValue(MagickThreadKey key)
184%
185% A description of each parameter follows:
186%
187% o key: the thread key.
188%
189*/
190MagickExport void *GetMagickThreadValue(MagickThreadKey key)
191{
192#if defined(MAGICKCORE_THREAD_SUPPORT)
193 return(pthread_getspecific(key));
194#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
195 return(TlsGetValue(key));
196#else
197 {
198 MagickThreadValue
199 *keys;
200
201 keys=(MagickThreadValue *) key;
202 return(keys->values[GetOpenMPThreadId()]);
203 }
204#endif
205}
206␌
207/*
208%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
209% %
210% %
211% %
212% S e t M a g i c k T h r e a d V a l u e %
213% %
214% %
215% %
216%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
217%
218% SetMagickThreadValue() binds a value to the specified key on behalf of the
219% calling thread.
220%
221% The format of the SetMagickThreadValue method is:
222%
223% MagickBooleanType SetMagickThreadValue(MagickThreadKey key,
224% const void *value)
225%
226% A description of each parameter follows:
227%
228% o key: the thread key.
229%
230% o value: the value.
231%
232*/
233MagickExport MagickBooleanType SetMagickThreadValue(MagickThreadKey key,
234 const void *value)
235{
236#if defined(MAGICKCORE_THREAD_SUPPORT)
237 return(pthread_setspecific(key,value) == 0 ? MagickTrue : MagickFalse);
238#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
239 return(TlsSetValue(key,(void *) value) != 0 ? MagickTrue : MagickFalse);
240#else
241 {
242 MagickThreadValue
243 *keys;
244
245 keys=(MagickThreadValue *) key;
246 keys->values[GetOpenMPThreadId()]=(void *) value;
247 }
248 return(MagickTrue);
249#endif
250}
_MagickThreadValue
Definition thread.c:50