164 lines
4.6 KiB
C
164 lines
4.6 KiB
C
/**
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* @file BTime.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* System time abstraction used by {@link BReactor}.
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*/
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#ifndef BADVPN_SYSTEM_BTIME_H
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#define BADVPN_SYSTEM_BTIME_H
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#if defined(BADVPN_USE_WINAPI)
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#include <windows.h>
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#elif defined(BADVPN_EMSCRIPTEN)
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#include <emscripten/emscripten.h>
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#else
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#include <time.h>
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#include <sys/time.h>
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#endif
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#include <stdint.h>
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#include <misc/debug.h>
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#include <misc/overflow.h>
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#include <base/BLog.h>
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#include <generated/blog_channel_BTime.h>
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typedef int64_t btime_t;
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#define BTIME_MIN INT64_MIN
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struct _BTime_global {
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#ifndef NDEBUG
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int initialized; // initialized statically
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#endif
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#if defined(BADVPN_USE_WINAPI)
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LARGE_INTEGER start_time;
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#elif defined(BADVPN_EMSCRIPTEN)
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btime_t start_time;
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#else
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btime_t start_time;
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int use_gettimeofday;
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#endif
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};
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extern struct _BTime_global btime_global;
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static void BTime_Init (void)
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{
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ASSERT(!btime_global.initialized)
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#if defined(BADVPN_USE_WINAPI)
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ASSERT_FORCE(QueryPerformanceCounter(&btime_global.start_time))
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#elif defined(BADVPN_EMSCRIPTEN)
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btime_global.start_time = emscripten_get_now();
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#else
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
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BLog(BLOG_WARNING, "CLOCK_MONOTONIC is not available. Timers will be confused by clock changes.");
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struct timeval tv;
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ASSERT_FORCE(gettimeofday(&tv, NULL) == 0)
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btime_global.start_time = (int64_t)tv.tv_sec * 1000 + (int64_t)tv.tv_usec/1000;
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btime_global.use_gettimeofday = 1;
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} else {
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btime_global.start_time = (int64_t)ts.tv_sec * 1000 + (int64_t)ts.tv_nsec/1000000;
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btime_global.use_gettimeofday = 0;
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}
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#endif
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#ifndef NDEBUG
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btime_global.initialized = 1;
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#endif
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}
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static btime_t btime_gettime (void)
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{
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ASSERT(btime_global.initialized)
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#if defined(BADVPN_USE_WINAPI)
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LARGE_INTEGER count;
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LARGE_INTEGER freq;
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ASSERT_FORCE(QueryPerformanceCounter(&count))
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ASSERT_FORCE(QueryPerformanceFrequency(&freq))
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return (((count.QuadPart - btime_global.start_time.QuadPart) * 1000) / freq.QuadPart);
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#elif defined(BADVPN_EMSCRIPTEN)
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return (btime_t)emscripten_get_now() - btime_global.start_time;
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#else
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if (btime_global.use_gettimeofday) {
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struct timeval tv;
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ASSERT_FORCE(gettimeofday(&tv, NULL) == 0)
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return ((int64_t)tv.tv_sec * 1000 + (int64_t)tv.tv_usec/1000);
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} else {
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struct timespec ts;
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ASSERT_FORCE(clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
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return (((int64_t)ts.tv_sec * 1000 + (int64_t)ts.tv_nsec/1000000) - btime_global.start_time);
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}
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#endif
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}
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static btime_t btime_add (btime_t t1, btime_t t2)
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{
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// handle overflow
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int overflows = add_int64_overflows(t1, t2);
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btime_t sum;
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if (overflows != 0) {
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if (overflows > 0) {
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sum = INT64_MAX;
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} else {
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sum = INT64_MIN;
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}
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} else {
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sum = t1 + t2;
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}
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return sum;
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}
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static btime_t btime_getpast (void)
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{
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return INT64_MIN;
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}
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#endif
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