1 /* 2 * Copyright (c) 2010-2012 Niels Provos and Nick Mathewson 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "event2/event-config.h" 28 29 #ifdef _WIN32 30 #include <winsock2.h> 31 #include <windows.h> 32 #else 33 #include <unistd.h> 34 #endif 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #ifdef EVENT__HAVE_SYS_TIME_H 38 #include <sys/time.h> 39 #endif 40 41 #ifdef EVENT__HAVE_SYS_SOCKET_H 42 #include <sys/socket.h> 43 #endif 44 #include <fcntl.h> 45 #include <stdlib.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <errno.h> 49 50 #include "event2/event.h" 51 #include "event2/util.h" 52 #include <time.h> 53 54 struct cpu_usage_timer { 55 #ifdef _WIN32 56 HANDLE thread; 57 FILETIME usertimeBegin; 58 FILETIME kerneltimeBegin; 59 #else 60 clock_t ticksBegin; 61 #endif 62 struct timeval timeBegin; 63 }; 64 static void 65 start_cpu_usage_timer(struct cpu_usage_timer *timer) 66 { 67 #ifdef _WIN32 68 int r; 69 FILETIME createtime, exittime; 70 timer->thread = GetCurrentThread(); 71 r = GetThreadTimes(timer->thread, &createtime, &exittime, 72 &timer->usertimeBegin, &timer->kerneltimeBegin); 73 if (r==0) printf("GetThreadTimes failed."); 74 #else 75 timer->ticksBegin = clock(); 76 #endif 77 78 evutil_gettimeofday(&timer->timeBegin, NULL); 79 } 80 #ifdef _WIN32 81 static ev_int64_t 82 filetime_to_100nsec(const FILETIME *ft) 83 { 84 /* Number of 100-nanosecond units */ 85 ev_int64_t n = ft->dwHighDateTime; 86 n <<= 32; 87 n += ft->dwLowDateTime; 88 return n; 89 } 90 static double 91 filetime_diff(const FILETIME *ftStart, const FILETIME *ftEnd) 92 { 93 ev_int64_t s, e, diff; 94 double r; 95 s = filetime_to_100nsec(ftStart); 96 e = filetime_to_100nsec(ftEnd); 97 diff = e - s; 98 r = (double) diff; 99 return r / 1.0e7; 100 } 101 #endif 102 103 static void 104 get_cpu_usage(struct cpu_usage_timer *timer, double *secElapsedOut, 105 double *secUsedOut, double *usageOut) 106 { 107 #ifdef _WIN32 108 double usertime_seconds, kerneltime_seconds; 109 FILETIME createtime, exittime, usertimeEnd, kerneltimeEnd; 110 int r; 111 #else 112 clock_t ticksEnd; 113 #endif 114 struct timeval timeEnd, timeDiff; 115 double secondsPassed, secondsUsed; 116 117 #ifdef _WIN32 118 r = GetThreadTimes(timer->thread, &createtime, &exittime, 119 &usertimeEnd, &kerneltimeEnd); 120 if (r==0) printf("GetThreadTimes failed."); 121 usertime_seconds = filetime_diff(&timer->usertimeBegin, &usertimeEnd); 122 kerneltime_seconds = filetime_diff(&timer->kerneltimeBegin, &kerneltimeEnd); 123 secondsUsed = kerneltime_seconds + usertime_seconds; 124 #else 125 ticksEnd = clock(); 126 secondsUsed = (ticksEnd - timer->ticksBegin) / (double)CLOCKS_PER_SEC; 127 #endif 128 evutil_gettimeofday(&timeEnd, NULL); 129 evutil_timersub(&timeEnd, &timer->timeBegin, &timeDiff); 130 secondsPassed = timeDiff.tv_sec + (timeDiff.tv_usec / 1.0e6); 131 132 *secElapsedOut = secondsPassed; 133 *secUsedOut = secondsUsed; 134 *usageOut = secondsUsed / secondsPassed; 135 } 136 137 static void 138 write_cb(evutil_socket_t fd, short event, void *arg) 139 { 140 printf("write callback. should only see this once\n"); 141 142 /* got what we want remove the event */ 143 event_del(*(struct event**)arg); 144 145 /* opps changed my mind add it back again */ 146 event_add(*(struct event**)arg,NULL); 147 148 /* not a good day for decisiveness, I really didn't want it after all */ 149 event_del(*(struct event**)arg); 150 151 } 152 153 static void 154 timeout_cb(evutil_socket_t fd, short event, void *arg) 155 { 156 printf("timeout fired, time to end test\n"); 157 event_del(*(struct event**)arg); 158 return; 159 } 160 161 int 162 main(int argc, char **argv) 163 { 164 struct event* ev; 165 struct event* timeout; 166 struct event_base* base; 167 168 evutil_socket_t pair[2]; 169 struct timeval tv; 170 struct cpu_usage_timer timer; 171 172 double usage, secPassed, secUsed; 173 174 #ifdef _WIN32 175 WORD wVersionRequested; 176 WSADATA wsaData; 177 178 wVersionRequested = MAKEWORD(2, 2); 179 180 (void) WSAStartup(wVersionRequested, &wsaData); 181 #endif 182 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) 183 return (1); 184 185 /* Initalize the event library */ 186 if (!(base = event_base_new())) 187 return (1); 188 189 /* Initalize a timeout to terminate the test */ 190 timeout = evtimer_new(base,timeout_cb,&timeout); 191 /* and watch for writability on one end of the pipe */ 192 ev = event_new(base,pair[1],EV_WRITE | EV_PERSIST, write_cb, &ev); 193 194 tv.tv_sec = 1; 195 tv.tv_usec = 500*1000; 196 197 evtimer_add(timeout, &tv); 198 199 event_add(ev, NULL); 200 201 start_cpu_usage_timer(&timer); 202 203 event_base_dispatch(base); 204 205 event_free(ev); 206 event_free(timeout); 207 event_base_free(base); 208 209 get_cpu_usage(&timer, &secPassed, &secUsed, &usage); 210 211 /* attempt to calculate our cpu usage over the test should be 212 virtually nil */ 213 214 printf("usec used=%d, usec passed=%d, cpu usage=%.2f%%\n", 215 (int)(secUsed*1e6), 216 (int)(secPassed*1e6), 217 usage*100); 218 219 if (usage > 50.0) /* way too high */ 220 return 1; 221 222 return 0; 223 } 224 225
