SuiteSparse_config.c
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1 /* ========================================================================== */
2 /* === SuiteSparse_config =================================================== */
3 /* ========================================================================== */
4 
5 /* SuiteSparse configuration : memory manager and printf functions. */
6 
7 /* Copyright (c) 2013-2018, Timothy A. Davis. No licensing restrictions
8  * apply to this file or to the SuiteSparse_config directory.
9  * Author: Timothy A. Davis.
10  */
11 
12 #include <math.h>
13 #include <stdlib.h>
14 
15 #ifndef NPRINT
16 #include <stdio.h>
17 #endif
18 
19 #ifdef MATLAB_MEX_FILE
20 #include "mex.h"
21 #include "matrix.h"
22 #endif
23 
24 #ifndef NULL
25 #define NULL ((void *) 0)
26 #endif
27 
28 #include "SuiteSparse_config.h"
29 
30 /* -------------------------------------------------------------------------- */
31 /* SuiteSparse_config : a global extern struct */
32 /* -------------------------------------------------------------------------- */
33 
34 /* The SuiteSparse_config struct is available to all SuiteSparse functions and
35  to all applications that use those functions. It must be modified with
36  care, particularly in a multithreaded context. Normally, the application
37  will initialize this object once, via SuiteSparse_start, possibily followed
38  by application-specific modifications if the applications wants to use
39  alternative memory manager functions.
40 
41  The user can redefine these global pointers at run-time to change the
42  memory manager and printf function used by SuiteSparse.
43 
44  If -DNMALLOC is defined at compile-time, then no memory-manager is
45  specified. You must define them at run-time, after calling
46  SuiteSparse_start.
47 
48  If -DPRINT is defined a compile time, then printf is disabled, and
49  SuiteSparse will not use printf.
50  */
51 
53 {
54 
55  /* memory management functions */
56  #ifndef NMALLOC
57  #ifdef MATLAB_MEX_FILE
58  /* MATLAB mexFunction: */
59  mxMalloc, mxCalloc, mxRealloc, mxFree,
60  #else
61  /* standard ANSI C: */
62  malloc, calloc, realloc, free,
63  #endif
64  #else
65  /* no memory manager defined; you must define one at run-time: */
66  NULL, NULL, NULL, NULL,
67  #endif
68 
69  /* printf function */
70  #ifndef NPRINT
71  #ifdef MATLAB_MEX_FILE
72  /* MATLAB mexFunction: */
73  mexPrintf,
74  #else
75  /* standard ANSI C: */
76  printf,
77  #endif
78  #else
79  /* printf is disabled */
80  NULL,
81  #endif
82 
85 
86 } ;
87 
88 /* -------------------------------------------------------------------------- */
89 /* SuiteSparse_start */
90 /* -------------------------------------------------------------------------- */
91 
92 /* All applications that use SuiteSparse should call SuiteSparse_start prior
93  to using any SuiteSparse function. Only a single thread should call this
94  function, in a multithreaded application. Currently, this function is
95  optional, since all this function currently does is to set the four memory
96  function pointers to NULL (which tells SuiteSparse to use the default
97  functions). In a multi- threaded application, only a single thread should
98  call this function.
99 
100  Future releases of SuiteSparse might enforce a requirement that
101  SuiteSparse_start be called prior to calling any SuiteSparse function.
102  */
103 
104 void SuiteSparse_start ( void )
105 {
106 
107  /* memory management functions */
108  #ifndef NMALLOC
109  #ifdef MATLAB_MEX_FILE
110  /* MATLAB mexFunction: */
111  SuiteSparse_config.malloc_func = mxMalloc ;
112  SuiteSparse_config.calloc_func = mxCalloc ;
113  SuiteSparse_config.realloc_func = mxRealloc ;
114  SuiteSparse_config.free_func = mxFree ;
115  #else
116  /* standard ANSI C: */
119  SuiteSparse_config.realloc_func = realloc ;
121  #endif
122  #else
123  /* no memory manager defined; you must define one after calling
124  SuiteSparse_start */
129  #endif
130 
131  /* printf function */
132  #ifndef NPRINT
133  #ifdef MATLAB_MEX_FILE
134  /* MATLAB mexFunction: */
135  SuiteSparse_config.printf_func = mexPrintf ;
136  #else
137  /* standard ANSI C: */
139  #endif
140  #else
141  /* printf is disabled */
143  #endif
144 
145  /* math functions */
148 }
149 
150 /* -------------------------------------------------------------------------- */
151 /* SuiteSparse_finish */
152 /* -------------------------------------------------------------------------- */
153 
154 /* This currently does nothing, but in the future, applications should call
155  SuiteSparse_start before calling any SuiteSparse function, and then
156  SuiteSparse_finish after calling the last SuiteSparse function, just before
157  exiting. In a multithreaded application, only a single thread should call
158  this function.
159 
160  Future releases of SuiteSparse might use this function for any
161  SuiteSparse-wide cleanup operations or finalization of statistics.
162  */
163 
164 void SuiteSparse_finish ( void )
165 {
166  /* do nothing */ ;
167 }
168 
169 /* -------------------------------------------------------------------------- */
170 /* SuiteSparse_malloc: malloc wrapper */
171 /* -------------------------------------------------------------------------- */
172 
173 void *SuiteSparse_malloc /* pointer to allocated block of memory */
174 (
175  size_t nitems, /* number of items to malloc */
176  size_t size_of_item /* sizeof each item */
177 )
178 {
179  void *p ;
180  size_t size ;
181  if (nitems < 1) nitems = 1 ;
182  if (size_of_item < 1) size_of_item = 1 ;
183  size = nitems * size_of_item ;
184 
185  if (size != ((double) nitems) * size_of_item)
186  {
187  /* size_t overflow */
188  p = NULL ;
189  }
190  else
191  {
192  p = (void *) (SuiteSparse_config.malloc_func) (size) ;
193  }
194  return (p) ;
195 }
196 
197 
198 /* -------------------------------------------------------------------------- */
199 /* SuiteSparse_calloc: calloc wrapper */
200 /* -------------------------------------------------------------------------- */
201 
202 void *SuiteSparse_calloc /* pointer to allocated block of memory */
203 (
204  size_t nitems, /* number of items to calloc */
205  size_t size_of_item /* sizeof each item */
206 )
207 {
208  void *p ;
209  size_t size ;
210  if (nitems < 1) nitems = 1 ;
211  if (size_of_item < 1) size_of_item = 1 ;
212  size = nitems * size_of_item ;
213 
214  if (size != ((double) nitems) * size_of_item)
215  {
216  /* size_t overflow */
217  p = NULL ;
218  }
219  else
220  {
221  p = (void *) (SuiteSparse_config.calloc_func) (nitems, size_of_item) ;
222  }
223  return (p) ;
224 }
225 
226 /* -------------------------------------------------------------------------- */
227 /* SuiteSparse_realloc: realloc wrapper */
228 /* -------------------------------------------------------------------------- */
229 
230 /* If p is non-NULL on input, it points to a previously allocated object of
231  size nitems_old * size_of_item. The object is reallocated to be of size
232  nitems_new * size_of_item. If p is NULL on input, then a new object of that
233  size is allocated. On success, a pointer to the new object is returned,
234  and ok is returned as 1. If the allocation fails, ok is set to 0 and a
235  pointer to the old (unmodified) object is returned.
236  */
237 
238 void *SuiteSparse_realloc /* pointer to reallocated block of memory, or
239  to original block if the realloc failed. */
240 (
241  size_t nitems_new, /* new number of items in the object */
242  size_t nitems_old, /* old number of items in the object */
243  size_t size_of_item, /* sizeof each item */
244  void *p, /* old object to reallocate */
245  int *ok /* 1 if successful, 0 otherwise */
246 )
247 {
248  size_t size ;
249  if (nitems_old < 1) nitems_old = 1 ;
250  if (nitems_new < 1) nitems_new = 1 ;
251  if (size_of_item < 1) size_of_item = 1 ;
252  size = nitems_new * size_of_item ;
253 
254  if (size != ((double) nitems_new) * size_of_item)
255  {
256  /* size_t overflow */
257  (*ok) = 0 ;
258  }
259  else if (p == NULL)
260  {
261  /* a fresh object is being allocated */
262  p = SuiteSparse_malloc (nitems_new, size_of_item) ;
263  (*ok) = (p != NULL) ;
264  }
265  else if (nitems_old == nitems_new)
266  {
267  /* the object does not change; do nothing */
268  (*ok) = 1 ;
269  }
270  else
271  {
272  /* change the size of the object from nitems_old to nitems_new */
273  void *pnew ;
274  pnew = (void *) (SuiteSparse_config.realloc_func) (p, size) ;
275  if (pnew == NULL)
276  {
277  if (nitems_new < nitems_old)
278  {
279  /* the attempt to reduce the size of the block failed, but
280  the old block is unchanged. So pretend to succeed. */
281  (*ok) = 1 ;
282  }
283  else
284  {
285  /* out of memory */
286  (*ok) = 0 ;
287  }
288  }
289  else
290  {
291  /* success */
292  p = pnew ;
293  (*ok) = 1 ;
294  }
295  }
296  return (p) ;
297 }
298 
299 /* -------------------------------------------------------------------------- */
300 /* SuiteSparse_free: free wrapper */
301 /* -------------------------------------------------------------------------- */
302 
303 void *SuiteSparse_free /* always returns NULL */
304 (
305  void *p /* block to free */
306 )
307 {
308  if (p)
309  {
311  }
312  return (NULL) ;
313 }
314 
315 
316 /* -------------------------------------------------------------------------- */
317 /* SuiteSparse_tic: return current wall clock time */
318 /* -------------------------------------------------------------------------- */
319 
320 /* Returns the number of seconds (tic [0]) and nanoseconds (tic [1]) since some
321  * unspecified but fixed time in the past. If no timer is installed, zero is
322  * returned. A scalar double precision value for 'tic' could be used, but this
323  * might cause loss of precision because clock_getttime returns the time from
324  * some distant time in the past. Thus, an array of size 2 is used.
325  *
326  * The timer is enabled by default. To disable the timer, compile with
327  * -DNTIMER. If enabled on a POSIX C 1993 system, the timer requires linking
328  * with the -lrt library.
329  *
330  * example:
331  *
332  * double tic [2], r, s, t ;
333  * SuiteSparse_tic (tic) ; // start the timer
334  * // do some work A
335  * t = SuiteSparse_toc (tic) ; // t is time for work A, in seconds
336  * // do some work B
337  * s = SuiteSparse_toc (tic) ; // s is time for work A and B, in seconds
338  * SuiteSparse_tic (tic) ; // restart the timer
339  * // do some work C
340  * r = SuiteSparse_toc (tic) ; // s is time for work C, in seconds
341  *
342  * A double array of size 2 is used so that this routine can be more easily
343  * ported to non-POSIX systems. The caller does not rely on the POSIX
344  * <time.h> include file.
345  */
346 
347 #ifdef SUITESPARSE_TIMER_ENABLED
348 
349 #include <time.h>
350 
351 void SuiteSparse_tic
352 (
353  double tic [2] /* output, contents undefined on input */
354 )
355 {
356  /* POSIX C 1993 timer, requires -librt */
357  struct timespec t ;
358  clock_gettime (CLOCK_MONOTONIC, &t) ;
359  tic [0] = (double) (t.tv_sec) ;
360  tic [1] = (double) (t.tv_nsec) ;
361 }
362 
363 #else
364 
365 void SuiteSparse_tic
366 (
367  double tic [2] /* output, contents undefined on input */
368 )
369 {
370  /* no timer installed */
371  tic [0] = 0 ;
372  tic [1] = 0 ;
373 }
374 
375 #endif
376 
377 
378 /* -------------------------------------------------------------------------- */
379 /* SuiteSparse_toc: return time since last tic */
380 /* -------------------------------------------------------------------------- */
381 
382 /* Assuming SuiteSparse_tic is accurate to the nanosecond, this function is
383  * accurate down to the nanosecond for 2^53 nanoseconds since the last call to
384  * SuiteSparse_tic, which is sufficient for SuiteSparse (about 104 days). If
385  * additional accuracy is required, the caller can use two calls to
386  * SuiteSparse_tic and do the calculations differently.
387  */
388 
389 double SuiteSparse_toc /* returns time in seconds since last tic */
390 (
391  double tic [2] /* input, not modified from last call to SuiteSparse_tic */
392 )
393 {
394  double toc [2] ;
395  SuiteSparse_tic (toc) ;
396  return ((toc [0] - tic [0]) + 1e-9 * (toc [1] - tic [1])) ;
397 }
398 
399 
400 /* -------------------------------------------------------------------------- */
401 /* SuiteSparse_time: return current wallclock time in seconds */
402 /* -------------------------------------------------------------------------- */
403 
404 /* This function might not be accurate down to the nanosecond. */
405 
406 double SuiteSparse_time /* returns current wall clock time in seconds */
407 (
408  void
409 )
410 {
411  double toc [2] ;
412  SuiteSparse_tic (toc) ;
413  return (toc [0] + 1e-9 * toc [1]) ;
414 }
415 
416 
417 /* -------------------------------------------------------------------------- */
418 /* SuiteSparse_version: return the current version of SuiteSparse */
419 /* -------------------------------------------------------------------------- */
420 
422 (
423  int version [3]
424 )
425 {
426  if (version != NULL)
427  {
431  }
432  return (SUITESPARSE_VERSION) ;
433 }
434 
435 /* -------------------------------------------------------------------------- */
436 /* SuiteSparse_hypot */
437 /* -------------------------------------------------------------------------- */
438 
439 /* There is an equivalent routine called hypot in <math.h>, which conforms
440  * to ANSI C99. However, SuiteSparse does not assume that ANSI C99 is
441  * available. You can use the ANSI C99 hypot routine with:
442  *
443  * #include <math.h>
444  *i SuiteSparse_config.hypot_func = hypot ;
445  *
446  * Default value of the SuiteSparse_config.hypot_func pointer is
447  * SuiteSparse_hypot, defined below.
448  *
449  * s = hypot (x,y) computes s = sqrt (x*x + y*y) but does so more accurately.
450  * The NaN cases for the double relops x >= y and x+y == x are safely ignored.
451  *
452  * Source: Algorithm 312, "Absolute value and square root of a complex number,"
453  * P. Friedland, Comm. ACM, vol 10, no 10, October 1967, page 665.
454  */
455 
456 double SuiteSparse_hypot (double x, double y)
457 {
458  double s, r ;
459  x = fabs (x) ;
460  y = fabs (y) ;
461  if (x >= y)
462  {
463  if (x + y == x)
464  {
465  s = x ;
466  }
467  else
468  {
469  r = y / x ;
470  s = x * sqrt (1.0 + r*r) ;
471  }
472  }
473  else
474  {
475  if (y + x == y)
476  {
477  s = y ;
478  }
479  else
480  {
481  r = x / y ;
482  s = y * sqrt (1.0 + r*r) ;
483  }
484  }
485  return (s) ;
486 }
487 
488 /* -------------------------------------------------------------------------- */
489 /* SuiteSparse_divcomplex */
490 /* -------------------------------------------------------------------------- */
491 
492 /* c = a/b where c, a, and b are complex. The real and imaginary parts are
493  * passed as separate arguments to this routine. The NaN case is ignored
494  * for the double relop br >= bi. Returns 1 if the denominator is zero,
495  * 0 otherwise.
496  *
497  * This uses ACM Algo 116, by R. L. Smith, 1962, which tries to avoid
498  * underflow and overflow.
499  *
500  * c can be the same variable as a or b.
501  *
502  * Default value of the SuiteSparse_config.divcomplex_func pointer is
503  * SuiteSparse_divcomplex.
504  */
505 
507 (
508  double ar, double ai, /* real and imaginary parts of a */
509  double br, double bi, /* real and imaginary parts of b */
510  double *cr, double *ci /* real and imaginary parts of c */
511 )
512 {
513  double tr, ti, r, den ;
514  if (fabs (br) >= fabs (bi))
515  {
516  r = bi / br ;
517  den = br + r * bi ;
518  tr = (ar + ai * r) / den ;
519  ti = (ai - ar * r) / den ;
520  }
521  else
522  {
523  r = br / bi ;
524  den = r * br + bi ;
525  tr = (ar * r + ai) / den ;
526  ti = (ai * r - ar) / den ;
527  }
528  *cr = tr ;
529  *ci = ti ;
530  return (den == 0.) ;
531 }
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SuiteSparse_config.h


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