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/*************************************************************************
* 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
#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;
}
#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
}
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