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starpu_rand.h
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1 /* StarPU --- Runtime system for heterogeneous multicore architectures.
2  *
3  * Copyright (C) 2012, 2013 Centre National de la Recherche Scientifique
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 
28 #ifdef STARPU_SIMGRID
29 /* In simgrid mode, force using seed 0 by default to get reproducible behavior by default */
30 #define starpu_seed(seed) starpu_get_env_number_default("STARPU_RAND_SEED", 0)
31 #else
32 #define starpu_seed(seed) starpu_get_env_number_default("STARPU_RAND_SEED", (seed))
33 #endif
34 
35 #ifdef STARPU_USE_DRAND48
36 # define starpu_srand48(seed) srand48(starpu_seed(seed))
37 # define starpu_drand48() drand48()
38 # define starpu_erand48(xsubi) erand48(xsubi)
39 # ifdef STARPU_USE_ERAND48_R
40 typedef struct drand48_data starpu_drand48_data;
41 # define starpu_srand48_r(seed, buffer) srand48_r(starpu_seed(seed), buffer)
42 # define starpu_erand48_r(xsubi, buffer, result) erand48_r(xsubi, buffer, result)
43 #else
44 typedef int starpu_drand48_data;
45 # define starpu_srand48_r(seed, buffer) srand48(starpu_seed(seed))
46 # define starpu_erand48_r(xsubi, buffer, result) do {*(result) = erand48(xsubi); } while (0)
47 # endif
48 #else
49 typedef int starpu_drand48_data;
50 # define starpu_srand48(seed) srand(starpu_seed(seed))
51 # define starpu_drand48() (double)(rand()) / RAND_MAX
52 # define starpu_erand48(xsubi) starpu_drand48()
53 # define starpu_srand48_r(seed, buffer) srand(starpu_seed(seed))
54 # define starpu_erand48_r(xsubi, buffer, result) do {*(result) = ((double)(rand()) / RAND_MAX);} while (0)
55 #endif
56 
57 #ifdef __cplusplus
58 }
59 #endif
60 
61 #endif /* __STARPU_RAND_H__ */