Alexandre Lision | 94f06ba | 2013-12-09 16:28:33 -0500 | [diff] [blame] | 1 | /* $Id$ */ |
Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pj/os.h> |
| 21 | #include <pj/assert.h> |
| 22 | #include <pj/errno.h> |
| 23 | #include <pj/log.h> |
| 24 | #include <windows.h> |
| 25 | |
| 26 | #define THIS_FILE "os_timestamp_win32.c" |
| 27 | |
| 28 | |
| 29 | #if 1 |
| 30 | # define TRACE_(x) PJ_LOG(3,x) |
| 31 | #else |
| 32 | # define TRACE_(x) ; |
| 33 | #endif |
| 34 | |
| 35 | |
| 36 | ///////////////////////////////////////////////////////////////////////////// |
| 37 | |
| 38 | #if defined(PJ_TIMESTAMP_USE_RDTSC) && PJ_TIMESTAMP_USE_RDTSC!=0 && \ |
| 39 | defined(PJ_M_I386) && PJ_M_I386 != 0 && \ |
| 40 | defined(PJ_HAS_PENTIUM) && PJ_HAS_PENTIUM!=0 && \ |
| 41 | defined(_MSC_VER) |
| 42 | |
| 43 | /* |
| 44 | * Use rdtsc to get the OS timestamp. |
| 45 | */ |
| 46 | static LONG CpuMhz; |
| 47 | static pj_int64_t CpuHz; |
| 48 | |
| 49 | static pj_status_t GetCpuHz(void) |
| 50 | { |
| 51 | HKEY key; |
| 52 | LONG rc; |
| 53 | DWORD size; |
| 54 | |
| 55 | #if defined(PJ_WIN32_WINCE) && PJ_WIN32_WINCE!=0 |
| 56 | rc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, |
| 57 | L"HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", |
| 58 | 0, 0, &key); |
| 59 | #else |
| 60 | rc = RegOpenKey( HKEY_LOCAL_MACHINE, |
| 61 | "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", |
| 62 | &key); |
| 63 | #endif |
| 64 | |
| 65 | if (rc != ERROR_SUCCESS) |
| 66 | return PJ_RETURN_OS_ERROR(rc); |
| 67 | |
| 68 | size = sizeof(CpuMhz); |
| 69 | rc = RegQueryValueEx(key, "~MHz", NULL, NULL, (BYTE*)&CpuMhz, &size); |
| 70 | RegCloseKey(key); |
| 71 | |
| 72 | if (rc != ERROR_SUCCESS) { |
| 73 | return PJ_RETURN_OS_ERROR(rc); |
| 74 | } |
| 75 | |
| 76 | CpuHz = CpuMhz; |
| 77 | CpuHz = CpuHz * 1000000; |
| 78 | |
| 79 | return PJ_SUCCESS; |
| 80 | } |
| 81 | |
| 82 | /* __int64 is nicely returned in EDX:EAX */ |
| 83 | __declspec(naked) __int64 rdtsc() |
| 84 | { |
| 85 | __asm |
| 86 | { |
| 87 | RDTSC |
| 88 | RET |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts) |
| 93 | { |
| 94 | ts->u64 = rdtsc(); |
| 95 | return PJ_SUCCESS; |
| 96 | } |
| 97 | |
| 98 | PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq) |
| 99 | { |
| 100 | pj_status_t status; |
| 101 | |
| 102 | if (CpuHz == 0) { |
| 103 | status = GetCpuHz(); |
| 104 | if (status != PJ_SUCCESS) |
| 105 | return status; |
| 106 | } |
| 107 | |
| 108 | freq->u64 = CpuHz; |
| 109 | return PJ_SUCCESS; |
| 110 | } |
| 111 | |
| 112 | ///////////////////////////////////////////////////////////////////////////// |
| 113 | |
| 114 | #elif defined(PJ_TIMESTAMP_WIN32_USE_SAFE_QPC) && \ |
| 115 | PJ_TIMESTAMP_WIN32_USE_SAFE_QPC!=0 |
| 116 | |
| 117 | /* Use safe QueryPerformanceCounter. |
| 118 | * This implementation has some protection against bug in KB Q274323: |
| 119 | * Performance counter value may unexpectedly leap forward |
| 120 | * http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q274323 |
| 121 | * |
| 122 | * THIS SHOULD NOT BE USED YET AS IT DOESN'T HANDLE SYSTEM TIME |
| 123 | * CHANGE. |
| 124 | */ |
| 125 | |
| 126 | static pj_timestamp g_ts_freq; |
| 127 | static pj_timestamp g_ts_base; |
| 128 | static pj_int64_t g_time_base; |
| 129 | |
| 130 | PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts) |
| 131 | { |
| 132 | enum { MAX_RETRY = 10 }; |
| 133 | unsigned i; |
| 134 | |
| 135 | |
| 136 | /* pj_get_timestamp_freq() must have been called before. |
| 137 | * This is done when application called pj_init(). |
| 138 | */ |
| 139 | pj_assert(g_ts_freq.u64 != 0); |
| 140 | |
| 141 | /* Retry QueryPerformanceCounter() until we're sure that the |
| 142 | * value returned makes sense. |
| 143 | */ |
| 144 | i = 0; |
| 145 | do { |
| 146 | LARGE_INTEGER val; |
| 147 | pj_int64_t counter64, time64, diff; |
| 148 | pj_time_val time_now; |
| 149 | |
| 150 | /* Retrieve the counter */ |
| 151 | if (!QueryPerformanceCounter(&val)) |
| 152 | return PJ_RETURN_OS_ERROR(GetLastError()); |
| 153 | |
| 154 | /* Regardless of the goodness of the value, we should put |
| 155 | * the counter here, because normally application wouldn't |
| 156 | * check the error result of this function. |
| 157 | */ |
| 158 | ts->u64 = val.QuadPart; |
| 159 | |
| 160 | /* Retrieve time */ |
| 161 | pj_gettimeofday(&time_now); |
| 162 | |
| 163 | /* Get the counter elapsed time in miliseconds */ |
| 164 | counter64 = (val.QuadPart - g_ts_base.u64) * 1000 / g_ts_freq.u64; |
| 165 | |
| 166 | /* Get the time elapsed in miliseconds. |
| 167 | * We don't want to use PJ_TIME_VAL_MSEC() since it's using |
| 168 | * 32bit calculation, which limits the maximum elapsed time |
| 169 | * to around 49 days only. |
| 170 | */ |
| 171 | time64 = time_now.sec; |
| 172 | time64 = time64 * 1000 + time_now.msec; |
| 173 | //time64 = GetTickCount(); |
| 174 | |
| 175 | /* It's good if the difference between two clocks are within |
| 176 | * some compile time constant (default: 20ms, which to allow |
| 177 | * context switch happen between QueryPerformanceCounter and |
| 178 | * pj_gettimeofday()). |
| 179 | */ |
| 180 | diff = (time64 - g_time_base) - counter64; |
| 181 | if (diff >= -20 && diff <= 20) { |
| 182 | /* It's good */ |
| 183 | return PJ_SUCCESS; |
| 184 | } |
| 185 | |
| 186 | ++i; |
| 187 | |
| 188 | } while (i < MAX_RETRY); |
| 189 | |
| 190 | TRACE_((THIS_FILE, "QueryPerformanceCounter returned bad value")); |
| 191 | return PJ_ETIMEDOUT; |
| 192 | } |
| 193 | |
| 194 | static pj_status_t init_performance_counter(void) |
| 195 | { |
| 196 | LARGE_INTEGER val; |
| 197 | pj_time_val time_base; |
| 198 | pj_status_t status; |
| 199 | |
| 200 | /* Get the frequency */ |
| 201 | if (!QueryPerformanceFrequency(&val)) |
| 202 | return PJ_RETURN_OS_ERROR(GetLastError()); |
| 203 | |
| 204 | g_ts_freq.u64 = val.QuadPart; |
| 205 | |
| 206 | /* Get the base timestamp */ |
| 207 | if (!QueryPerformanceCounter(&val)) |
| 208 | return PJ_RETURN_OS_ERROR(GetLastError()); |
| 209 | |
| 210 | g_ts_base.u64 = val.QuadPart; |
| 211 | |
| 212 | |
| 213 | /* Get the base time */ |
| 214 | status = pj_gettimeofday(&time_base); |
| 215 | if (status != PJ_SUCCESS) |
| 216 | return status; |
| 217 | |
| 218 | /* Convert time base to 64bit value in msec */ |
| 219 | g_time_base = time_base.sec; |
| 220 | g_time_base = g_time_base * 1000 + time_base.msec; |
| 221 | //g_time_base = GetTickCount(); |
| 222 | |
| 223 | return PJ_SUCCESS; |
| 224 | } |
| 225 | |
| 226 | PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq) |
| 227 | { |
| 228 | if (g_ts_freq.u64 == 0) { |
| 229 | enum { MAX_REPEAT = 10 }; |
| 230 | unsigned i; |
| 231 | pj_status_t status; |
| 232 | |
| 233 | /* Make unellegant compiler happy */ |
| 234 | status = 0; |
| 235 | |
| 236 | /* Repeat initializing performance counter until we're sure |
| 237 | * the base timing is correct. It is possible that the system |
| 238 | * returns bad counter during this initialization! |
| 239 | */ |
| 240 | for (i=0; i<MAX_REPEAT; ++i) { |
| 241 | |
| 242 | pj_timestamp dummy; |
| 243 | |
| 244 | /* Init base time */ |
| 245 | status = init_performance_counter(); |
| 246 | if (status != PJ_SUCCESS) |
| 247 | return status; |
| 248 | |
| 249 | /* Try the base time */ |
| 250 | status = pj_get_timestamp(&dummy); |
| 251 | if (status == PJ_SUCCESS) |
| 252 | break; |
| 253 | } |
| 254 | |
| 255 | if (status != PJ_SUCCESS) |
| 256 | return status; |
| 257 | } |
| 258 | |
| 259 | freq->u64 = g_ts_freq.u64; |
| 260 | return PJ_SUCCESS; |
| 261 | } |
| 262 | |
| 263 | ///////////////////////////////////////////////////////////////////////////// |
| 264 | |
| 265 | #else |
| 266 | |
| 267 | /* |
| 268 | * Use QueryPerformanceCounter and QueryPerformanceFrequency. |
| 269 | * This should be the default implementation to be used on Windows. |
| 270 | */ |
| 271 | PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts) |
| 272 | { |
| 273 | LARGE_INTEGER val; |
| 274 | |
| 275 | if (!QueryPerformanceCounter(&val)) |
| 276 | return PJ_RETURN_OS_ERROR(GetLastError()); |
| 277 | |
| 278 | ts->u64 = val.QuadPart; |
| 279 | return PJ_SUCCESS; |
| 280 | } |
| 281 | |
| 282 | PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq) |
| 283 | { |
| 284 | LARGE_INTEGER val; |
| 285 | |
| 286 | if (!QueryPerformanceFrequency(&val)) |
| 287 | return PJ_RETURN_OS_ERROR(GetLastError()); |
| 288 | |
| 289 | freq->u64 = val.QuadPart; |
| 290 | return PJ_SUCCESS; |
| 291 | } |
| 292 | |
| 293 | |
| 294 | #endif /* PJ_TIMESTAMP_USE_RDTSC */ |
| 295 | |