1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*************************************************************************
* Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Platform abstractions.
*/
#include "dimension-impl.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef _WIN32
#include <windows.h>
#endif
#if DMNSN_BACKTRACE
#include <execinfo.h> /* For backtrace() etc. */
#endif
#if DMNSN_GETTID
#include <sys/syscall.h> /* For gettid() where supported */
#endif
#if DMNSN_SCHED_GETAFFINITY
#include <sched.h> /* For sched_getaffinity() */
#endif
#if DMNSN_TIMES
#include <sys/times.h>
#endif
void
dmnsn_backtrace(FILE *file)
{
#if DMNSN_BACKTRACE
const size_t size = 128;
void *buffer[size];
int nptrs = backtrace(buffer, size);
int fd = fileno(file);
if (fd != -1) {
backtrace_symbols_fd(buffer, nptrs, fd);
}
#endif
}
bool
dmnsn_is_main_thread(void)
{
#if DMNSN_GETTID
return getpid() == syscall(SYS_gettid);
#else
return true;
#endif
}
bool
dmnsn_is_little_endian(void)
{
/* Undefined behaviour, but quite portable */
union {
unsigned int i;
unsigned char c;
} u = { .i = 1 };
return u.c == 1;
}
size_t
dmnsn_ncpus(void)
{
#if DMNSN_SCHED_GETAFFINITY
cpu_set_t cpuset;
if (sched_getaffinity(0, sizeof(cpuset), &cpuset) == 0) {
return CPU_COUNT(&cpuset);
} else {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "sched_getaffinity() failed.");
return 1;
}
#elif DMNSN_SC_NPROCESSORS_ONLN
long nprocs = sysconf(_SC_NPROCESSORS_ONLN);
if (nprocs > 0) {
return nprocs;
} else {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "sysconf(_SC_NPROCESSORS_ONLN) failed.");
return 1;
}
#elif defined(_WIN32)
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
return sysinfo.dwNumberOfProcessors;
#else
return 1;
#endif
}
#if DMNSN_TIMES
/** Clock ticks per second. */
static long clk_tck = 0;
#endif
void
dmnsn_get_times(dmnsn_timer *timer)
{
#if DMNSN_TIMES
/* Figure out the clock ticks per second */
if (!clk_tck) {
clk_tck = sysconf(_SC_CLK_TCK);
if (clk_tck == -1) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "sysconf(_SC_CLK_TCK) failed.");
clk_tck = 1000000L;
}
}
struct tms buf;
clock_t real = times(&buf);
timer->real = (double)real/clk_tck;
timer->user = (double)buf.tms_utime/clk_tck;
timer->system = (double)buf.tms_stime/clk_tck;
#else
timer->real = 0.0;
timer->user = 0.0;
timer->system = 0.0;
#endif
}
|
