StarPU Handbook
starpu_rand.h
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1 /* StarPU --- Runtime system for heterogeneous multicore architectures.
2  *
3  * Copyright (C) 2012-2021 Université de Bordeaux, CNRS (LaBRI UMR 5800), Inria
4  *
5  * StarPU is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU Lesser General Public License as published by
7  * the Free Software Foundation; either version 2.1 of the License, or (at
8  * your option) any later version.
9  *
10  * StarPU is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13  *
14  * See the GNU Lesser General Public License in COPYING.LGPL for more details.
15  */
16 
17 #ifndef __STARPU_RAND_H__
18 #define __STARPU_RAND_H__
19 
20 #include <stdlib.h>
21 #include <starpu_config.h>
22 
23 #ifdef __cplusplus
24 extern "C"
25 {
26 #endif
27 
33 #ifdef STARPU_SIMGRID
34 /* In simgrid mode, force using seed 0 by default to get reproducible behavior by default */
35 #define starpu_seed(seed) starpu_get_env_number_default("STARPU_RAND_SEED", 0)
36 #else
37 #define starpu_seed(seed) starpu_get_env_number_default("STARPU_RAND_SEED", (seed))
38 #endif
39 
40 #ifdef STARPU_USE_DRAND48
41 # define starpu_srand48(seed) srand48(starpu_seed(seed))
42 # define starpu_drand48() drand48()
43 # define starpu_lrand48() lrand48()
44 # define starpu_erand48(xsubi) erand48(xsubi)
45 # ifdef STARPU_USE_ERAND48_R
46 typedef struct drand48_data starpu_drand48_data;
47 # define starpu_srand48_r(seed, buffer) srand48_r(starpu_seed(seed), buffer)
48 # define starpu_drand48_r(buffer, result) drand48_r(buffer, result)
49 # define starpu_lrand48_r(buffer, result) lrand48_r(buffer, result)
50 # define starpu_erand48_r(xsubi, buffer, result) erand48_r(xsubi, buffer, result)
51 #else
52 typedef int starpu_drand48_data;
53 # define starpu_srand48_r(seed, buffer) srand48(starpu_seed(seed))
54 # define starpu_drand48_r(buffer, result) do {*(result) = drand48(); } while (0)
55 # define starpu_lrand48_r(buffer, result) do {*(result) = lrand48(); } while (0)
56 # define starpu_erand48_r(xsubi, buffer, result) do {(void) buffer; *(result) = erand48(xsubi); } while (0)
57 # endif
58 #else
59 typedef int starpu_drand48_data;
60 # define starpu_srand48(seed) srand(starpu_seed(seed))
61 # define starpu_drand48() (double)(rand()) / RAND_MAX
62 # define starpu_lrand48() rand()
63 # define starpu_erand48(xsubi) starpu_drand48()
64 # define starpu_srand48_r(seed, buffer) srand(starpu_seed(seed))
65 # define starpu_erand48_r(xsubi, buffer, result) do {(void) xsubi; (void) buffer; *(result) = ((double)(rand()) / RAND_MAX);} while (0)
66 #endif
67 
70 #ifdef __cplusplus
71 }
72 #endif
73 
74 #endif /* __STARPU_RAND_H__ */