| /* |
| * hdhomerun_os_posix.c |
| * |
| * Copyright © 2006-2010 Silicondust USA Inc. <www.silicondust.com>. |
| * |
| * This 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. |
| * |
| * This 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 library. If not, see <http://www.gnu.org/licenses/>. |
| * |
| * As a special exception to the GNU Lesser General Public License, |
| * you may link, statically or dynamically, an application with a |
| * publicly distributed version of the Library to produce an |
| * executable file containing portions of the Library, and |
| * distribute that executable file under terms of your choice, |
| * without any of the additional requirements listed in clause 4 of |
| * the GNU Lesser General Public License. |
| * |
| * By "a publicly distributed version of the Library", we mean |
| * either the unmodified Library as distributed by Silicondust, or a |
| * modified version of the Library that is distributed under the |
| * conditions defined in the GNU Lesser General Public License. |
| */ |
| |
| #include "hdhomerun_os.h" |
| |
| uint32_t random_get32(void) |
| { |
| FILE *fp = fopen("/dev/urandom", "rb"); |
| if (!fp) { |
| return (uint32_t)rand(); |
| } |
| |
| uint32_t Result; |
| if (fread(&Result, 4, 1, fp) != 1) { |
| Result = (uint32_t)rand(); |
| } |
| |
| fclose(fp); |
| return Result; |
| } |
| |
| uint64_t getcurrenttime(void) |
| { |
| static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; |
| static uint64_t result = 0; |
| static uint64_t previous_time = 0; |
| |
| pthread_mutex_lock(&lock); |
| |
| #if defined(CLOCK_MONOTONIC) |
| struct timespec tp; |
| clock_gettime(CLOCK_MONOTONIC, &tp); |
| uint64_t current_time = ((uint64_t)tp.tv_sec * 1000) + (tp.tv_nsec / 1000000); |
| #else |
| struct timeval t; |
| gettimeofday(&t, NULL); |
| uint64_t current_time = ((uint64_t)t.tv_sec * 1000) + (t.tv_usec / 1000); |
| #endif |
| |
| if (current_time > previous_time) { |
| result += current_time - previous_time; |
| } |
| |
| previous_time = current_time; |
| |
| pthread_mutex_unlock(&lock); |
| return result; |
| } |
| |
| void msleep_approx(uint64_t ms) |
| { |
| unsigned int delay_s = ms / 1000; |
| if (delay_s > 0) { |
| sleep(delay_s); |
| ms -= delay_s * 1000; |
| } |
| |
| unsigned int delay_us = ms * 1000; |
| if (delay_us > 0) { |
| usleep(delay_us); |
| } |
| } |
| |
| void msleep_minimum(uint64_t ms) |
| { |
| uint64_t stop_time = getcurrenttime() + ms; |
| |
| while (1) { |
| uint64_t current_time = getcurrenttime(); |
| if (current_time >= stop_time) { |
| return; |
| } |
| |
| msleep_approx(stop_time - current_time); |
| } |
| } |