StarPU Handbook
starpu_rand.h
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1 /* StarPU --- Runtime system for heterogeneous multicore architectures.
2  *
3  * Copyright (C) 2012,2013,2015,2017,2019 CNRS
4  * Copyright (C) 2012,2015,2016 Université de Bordeaux
5  * Copyright (C) 2012 Inria
6  *
7  * StarPU is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU Lesser General Public License as published by
9  * the Free Software Foundation; either version 2.1 of the License, or (at
10  * your option) any later version.
11  *
12  * StarPU is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
15  *
16  * See the GNU Lesser General Public License in COPYING.LGPL for more details.
17  */
18 
19 #ifndef __STARPU_RAND_H__
20 #define __STARPU_RAND_H__
21 
22 #include <stdlib.h>
23 #include <starpu_config.h>
24 
25 #ifdef __cplusplus
26 extern "C"
27 {
28 #endif
29 
35 #ifdef STARPU_SIMGRID
36 /* In simgrid mode, force using seed 0 by default to get reproducible behavior by default */
37 #define starpu_seed(seed) starpu_get_env_number_default("STARPU_RAND_SEED", 0)
38 #else
39 #define starpu_seed(seed) starpu_get_env_number_default("STARPU_RAND_SEED", (seed))
40 #endif
41 
42 #ifdef STARPU_USE_DRAND48
43 # define starpu_srand48(seed) srand48(starpu_seed(seed))
44 # define starpu_drand48() drand48()
45 # define starpu_lrand48() lrand48()
46 # define starpu_erand48(xsubi) erand48(xsubi)
47 # ifdef STARPU_USE_ERAND48_R
48 typedef struct drand48_data starpu_drand48_data;
49 # define starpu_srand48_r(seed, buffer) srand48_r(starpu_seed(seed), buffer)
50 # define starpu_drand48_r(buffer, result) drand48_r(buffer, result)
51 # define starpu_lrand48_r(buffer, result) lrand48_r(buffer, result)
52 # define starpu_erand48_r(xsubi, buffer, result) erand48_r(xsubi, buffer, result)
53 #else
54 typedef int starpu_drand48_data;
55 # define starpu_srand48_r(seed, buffer) srand48(starpu_seed(seed))
56 # define starpu_drand48_r(buffer, result) do {*(result) = drand48(); } while (0)
57 # define starpu_lrand48_r(buffer, result) do {*(result) = lrand48(); } while (0)
58 # define starpu_erand48_r(xsubi, buffer, result) do {(void) buffer; *(result) = erand48(xsubi); } while (0)
59 # endif
60 #else
61 typedef int starpu_drand48_data;
62 # define starpu_srand48(seed) srand(starpu_seed(seed))
63 # define starpu_drand48() (double)(rand()) / RAND_MAX
64 # define starpu_lrand48() rand()
65 # define starpu_erand48(xsubi) starpu_drand48()
66 # define starpu_srand48_r(seed, buffer) srand(starpu_seed(seed))
67 # define starpu_erand48_r(xsubi, buffer, result) do {(void) xsubi; (void) buffer; *(result) = ((double)(rand()) / RAND_MAX);} while (0)
68 #endif
69 
72 #ifdef __cplusplus
73 }
74 #endif
75 
76 #endif /* __STARPU_RAND_H__ */
starpu_config.h