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Annotation of embedaddon/curl/src/tool_util.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  *
        !            10:  * This software is licensed as described in the file COPYING, which
        !            11:  * you should have received as part of this distribution. The terms
        !            12:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            13:  *
        !            14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15:  * copies of the Software, and permit persons to whom the Software is
        !            16:  * furnished to do so, under the terms of the COPYING file.
        !            17:  *
        !            18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19:  * KIND, either express or implied.
        !            20:  *
        !            21:  ***************************************************************************/
        !            22: #include "tool_setup.h"
        !            23: 
        !            24: #include "tool_util.h"
        !            25: 
        !            26: #include "memdebug.h" /* keep this as LAST include */
        !            27: 
        !            28: #if defined(WIN32) && !defined(MSDOS)
        !            29: 
        !            30: /* set in win32_init() */
        !            31: extern LARGE_INTEGER tool_freq;
        !            32: extern bool tool_isVistaOrGreater;
        !            33: 
        !            34: /* In case of bug fix this function has a counterpart in timeval.c */
        !            35: struct timeval tvnow(void)
        !            36: {
        !            37:   struct timeval now;
        !            38:   if(tool_isVistaOrGreater) { /* QPC timer might have issues pre-Vista */
        !            39:     LARGE_INTEGER count;
        !            40:     QueryPerformanceCounter(&count);
        !            41:     now.tv_sec = (long)(count.QuadPart / tool_freq.QuadPart);
        !            42:     now.tv_usec = (long)((count.QuadPart % tool_freq.QuadPart) * 1000000 /
        !            43:                          tool_freq.QuadPart);
        !            44:   }
        !            45:   else {
        !            46:     /* Disable /analyze warning that GetTickCount64 is preferred  */
        !            47: #if defined(_MSC_VER)
        !            48: #pragma warning(push)
        !            49: #pragma warning(disable:28159)
        !            50: #endif
        !            51:     DWORD milliseconds = GetTickCount();
        !            52: #if defined(_MSC_VER)
        !            53: #pragma warning(pop)
        !            54: #endif
        !            55: 
        !            56:     now.tv_sec = (long)(milliseconds / 1000);
        !            57:     now.tv_usec = (long)((milliseconds % 1000) * 1000);
        !            58:   }
        !            59:   return now;
        !            60: }
        !            61: 
        !            62: #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
        !            63: 
        !            64: struct timeval tvnow(void)
        !            65: {
        !            66:   /*
        !            67:   ** clock_gettime() is granted to be increased monotonically when the
        !            68:   ** monotonic clock is queried. Time starting point is unspecified, it
        !            69:   ** could be the system start-up time, the Epoch, or something else,
        !            70:   ** in any case the time starting point does not change once that the
        !            71:   ** system has started up.
        !            72:   */
        !            73:   struct timeval now;
        !            74:   struct timespec tsnow;
        !            75:   if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
        !            76:     now.tv_sec = tsnow.tv_sec;
        !            77:     now.tv_usec = tsnow.tv_nsec / 1000;
        !            78:   }
        !            79:   /*
        !            80:   ** Even when the configure process has truly detected monotonic clock
        !            81:   ** availability, it might happen that it is not actually available at
        !            82:   ** run-time. When this occurs simply fallback to other time source.
        !            83:   */
        !            84: #ifdef HAVE_GETTIMEOFDAY
        !            85:   else
        !            86:     (void)gettimeofday(&now, NULL);
        !            87: #else
        !            88:   else {
        !            89:     now.tv_sec = (long)time(NULL);
        !            90:     now.tv_usec = 0;
        !            91:   }
        !            92: #endif
        !            93:   return now;
        !            94: }
        !            95: 
        !            96: #elif defined(HAVE_GETTIMEOFDAY)
        !            97: 
        !            98: struct timeval tvnow(void)
        !            99: {
        !           100:   /*
        !           101:   ** gettimeofday() is not granted to be increased monotonically, due to
        !           102:   ** clock drifting and external source time synchronization it can jump
        !           103:   ** forward or backward in time.
        !           104:   */
        !           105:   struct timeval now;
        !           106:   (void)gettimeofday(&now, NULL);
        !           107:   return now;
        !           108: }
        !           109: 
        !           110: #else
        !           111: 
        !           112: struct timeval tvnow(void)
        !           113: {
        !           114:   /*
        !           115:   ** time() returns the value of time in seconds since the Epoch.
        !           116:   */
        !           117:   struct timeval now;
        !           118:   now.tv_sec = (long)time(NULL);
        !           119:   now.tv_usec = 0;
        !           120:   return now;
        !           121: }
        !           122: 
        !           123: #endif
        !           124: 
        !           125: /*
        !           126:  * Make sure that the first argument is the more recent time, as otherwise
        !           127:  * we'll get a weird negative time-diff back...
        !           128:  *
        !           129:  * Returns: the time difference in number of milliseconds.
        !           130:  */
        !           131: long tvdiff(struct timeval newer, struct timeval older)
        !           132: {
        !           133:   return (long)(newer.tv_sec-older.tv_sec)*1000+
        !           134:     (long)(newer.tv_usec-older.tv_usec)/1000;
        !           135: }