1 /* Copyright (C) 2017 The Android Open Source Project 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This file implements interfaces from the file jvmti.h. This implementation 5 * is licensed under the same terms as the file jvmti.h. The 6 * copyright and license information for the file jvmti.h follows. 7 * 8 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. 9 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 10 * 11 * This code is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License version 2 only, as 13 * published by the Free Software Foundation. Oracle designates this 14 * particular file as subject to the "Classpath" exception as provided 15 * by Oracle in the LICENSE file that accompanied this code. 16 * 17 * This code is distributed in the hope that it will be useful, but WITHOUT 18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 20 * version 2 for more details (a copy is included in the LICENSE file that 21 * accompanied this code). 22 * 23 * You should have received a copy of the GNU General Public License version 24 * 2 along with this work; if not, write to the Free Software Foundation, 25 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 26 * 27 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 28 * or visit www.oracle.com if you need additional information or have any 29 * questions. 30 */ 31 32 #include "ti_timers.h" 33 34 #include <limits> 35 36 #ifndef __APPLE__ 37 #include <time.h> 38 #else 39 #include <sys/time.h> 40 #endif 41 #include <unistd.h> 42 43 #include "art_jvmti.h" 44 #include "base/macros.h" 45 46 namespace openjdkjvmti { 47 48 jvmtiError TimerUtil::GetAvailableProcessors(jvmtiEnv* env ATTRIBUTE_UNUSED, 49 jint* processor_count_ptr) { 50 if (processor_count_ptr == nullptr) { 51 return ERR(NULL_POINTER); 52 } 53 54 *processor_count_ptr = static_cast<jint>(sysconf(_SC_NPROCESSORS_CONF)); 55 56 return ERR(NONE); 57 } 58 59 jvmtiError TimerUtil::GetTimerInfo(jvmtiEnv* env ATTRIBUTE_UNUSED, jvmtiTimerInfo* info_ptr) { 60 if (info_ptr == nullptr) { 61 return ERR(NULL_POINTER); 62 } 63 64 info_ptr->max_value = static_cast<jlong>(std::numeric_limits<uint64_t>::max()); 65 info_ptr->may_skip_forward = JNI_TRUE; 66 info_ptr->may_skip_backward = JNI_TRUE; 67 info_ptr->kind = jvmtiTimerKind::JVMTI_TIMER_ELAPSED; 68 69 return ERR(NONE); 70 } 71 72 jvmtiError TimerUtil::GetTime(jvmtiEnv* env ATTRIBUTE_UNUSED, jlong* nanos_ptr) { 73 if (nanos_ptr == nullptr) { 74 return ERR(NULL_POINTER); 75 } 76 77 #ifndef __APPLE__ 78 // Use the same implementation as System.nanoTime. 79 struct timespec now; 80 clock_gettime(CLOCK_MONOTONIC, &now); 81 *nanos_ptr = now.tv_sec * 1000000000LL + now.tv_nsec; 82 #else 83 // No CLOCK_MONOTONIC support on older Mac OS. 84 struct timeval t; 85 t.tv_sec = t.tv_usec = 0; 86 gettimeofday(&t, NULL); 87 *nanos_ptr = static_cast<jlong>(t.tv_sec)*1000000000LL + static_cast<jlong>(t.tv_usec)*1000LL; 88 #endif 89 90 return ERR(NONE); 91 } 92 93 } // namespace openjdkjvmti 94
