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util_posix.c
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util_posix.c
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//-----------------------------------------------------------------------------
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// utilities requiring Posix library functions
//-----------------------------------------------------------------------------
#if !defined(_WIN32)
#define _POSIX_C_SOURCE 199309L // need nanosleep()
#else
#include <windows.h>
#endif
#include "util_posix.h"
#include <stdint.h>
#include <time.h>
// Timer functions
#if !defined (_WIN32)
#include <errno.h>
static void nsleep(uint64_t n) {
struct timespec timeout;
timeout.tv_sec = n / 1000000000;
timeout.tv_nsec = n % 1000000000;
while (nanosleep(&timeout, &timeout) && errno == EINTR);
}
void msleep(uint32_t n) {
nsleep(1000000 * (uint64_t) n);
}
#endif // _WIN32
#ifdef __APPLE__
#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC (1)
#endif
#ifndef CLOCK_REALTIME
#define CLOCK_REALTIME (2)
#endif
#include <sys/time.h>
#include <mach/clock.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
/* clock_gettime is not implemented on OSX prior to 10.12 */
int _civet_clock_gettime(int clk_id, struct timespec *t);
int _civet_clock_gettime(int clk_id, struct timespec *t) {
memset(t, 0, sizeof (*t));
if (clk_id == CLOCK_REALTIME) {
struct timeval now;
int rv = gettimeofday(&now, NULL);
if (rv) {
return rv;
}
t->tv_sec = now.tv_sec;
t->tv_nsec = now.tv_usec * 1000;
return 0;
} else if (clk_id == CLOCK_MONOTONIC) {
static uint64_t clock_start_time = 0;
static mach_timebase_info_data_t timebase_info = {0, 0};
uint64_t now = mach_absolute_time();
if (clock_start_time == 0) {
mach_timebase_info(&timebase_info);
clock_start_time = now;
}
now = (uint64_t) ((double) (now - clock_start_time)
* (double) timebase_info.numer
/ (double) timebase_info.denom);
t->tv_sec = now / 1000000000;
t->tv_nsec = now % 1000000000;
return 0;
}
return -1; // EINVAL - Clock ID is unknown
}
/* if clock_gettime is declared, then __CLOCK_AVAILABILITY will be defined */
#ifdef __CLOCK_AVAILABILITY
/* If we compiled with Mac OSX 10.12 or later, then clock_gettime will be declared
* but it may be NULL at runtime. So we need to check before using it. */
int _civet_safe_clock_gettime(int clk_id, struct timespec *t);
int _civet_safe_clock_gettime(int clk_id, struct timespec *t) {
if (clock_gettime) {
return clock_gettime(clk_id, t);
}
return _civet_clock_gettime(clk_id, t);
}
#define clock_gettime _civet_safe_clock_gettime
#else
#define clock_gettime _civet_clock_gettime
#endif
#endif
// a milliseconds timer for performance measurement
uint64_t msclock() {
#if defined(_WIN32)
#include <sys/types.h>
// WORKAROUND FOR MinGW (some versions - use if normal code does not compile)
// It has no _ftime_s and needs explicit inclusion of timeb.h
#include <sys/timeb.h>
struct _timeb t;
_ftime(&t);
return 1000 * (uint64_t) t.time + t.millitm;
// NORMAL CODE (use _ftime_s)
//struct _timeb t;
//if (_ftime_s(&t)) {
// return 0;
//} else {
// return 1000 * t.time + t.millitm;
//}
#else
struct timespec t;
clock_gettime(CLOCK_MONOTONIC, &t);
return (t.tv_sec * 1000 + t.tv_nsec / 1000000);
#endif
}