11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* $OpenBSD: time.c,v 1.5 2005/08/08 08:05:34 espie Exp $ */ 21dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Copyright (c) 1983, 1993 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The Regents of the University of California. All rights reserved. 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * documentation and/or other materials provided with the distribution. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3. Neither the name of the University nor the names of its contributors 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * may be used to endorse or promote products derived from this software 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * without specific prior written permission. 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <time.h> 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projecttime_t 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projecttime(time_t *t) 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project struct timeval tt; 3721edf366ea9b5e4dc04c217289fdaf39f08a0060Jim Huang time_t ret; 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (gettimeofday(&tt, (struct timezone *)0) < 0) 4021edf366ea9b5e4dc04c217289fdaf39f08a0060Jim Huang ret = -1; 4121edf366ea9b5e4dc04c217289fdaf39f08a0060Jim Huang else 4221edf366ea9b5e4dc04c217289fdaf39f08a0060Jim Huang ret = tt.tv_sec; 4321edf366ea9b5e4dc04c217289fdaf39f08a0060Jim Huang if (t != NULL) 4421edf366ea9b5e4dc04c217289fdaf39f08a0060Jim Huang *t = ret; 4521edf366ea9b5e4dc04c217289fdaf39f08a0060Jim Huang return ret; 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 482cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten// return monotonically increasing CPU time in ticks relative to unspecified epoch 492cc0d38afb4263713f083d4241fb889479f863fcGlenn Kastenstatic inline clock_t clock_now(void) 502cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten{ 512cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten struct timespec tm; 522cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten clock_gettime( CLOCK_MONOTONIC, &tm); 532cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten return tm.tv_sec * CLOCKS_PER_SEC + (tm.tv_nsec * (CLOCKS_PER_SEC/1e9)); 542cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten} 552cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten 562cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten// initialized by the constructor below 572cc0d38afb4263713f083d4241fb889479f863fcGlenn Kastenstatic clock_t clock_start; 582cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten 592cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten// called by dlopen when .so is loaded 602cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten__attribute__((constructor)) static void clock_crt0(void) 612cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten{ 622cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten clock_start = clock_now(); 632cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten} 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 652cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten// return elapsed CPU time in clock ticks, since start of program execution 662cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten// (spec says epoch is undefined, but glibc uses crt0 as epoch) 671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectclock_t 681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectclock(void) 691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 702cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten // note that if we are executing in a different thread than crt0, then the 712cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten // pthread_create that made us had a memory barrier so clock_start is defined 722cc0d38afb4263713f083d4241fb889479f863fcGlenn Kasten return clock_now() - clock_start; 731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 74