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Annotation of embedaddon/iperf/src/iperf_time.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * iperf, Copyright (c) 2014-2018, The Regents of the University of
        !             3:  * California, through Lawrence Berkeley National Laboratory (subject
        !             4:  * to receipt of any required approvals from the U.S. Dept. of
        !             5:  * Energy).  All rights reserved.
        !             6:  *
        !             7:  * If you have questions about your rights to use or distribute this
        !             8:  * software, please contact Berkeley Lab's Technology Transfer
        !             9:  * Department at TTD@lbl.gov.
        !            10:  *
        !            11:  * NOTICE.  This software is owned by the U.S. Department of Energy.
        !            12:  * As such, the U.S. Government has been granted for itself and others
        !            13:  * acting on its behalf a paid-up, nonexclusive, irrevocable,
        !            14:  * worldwide license in the Software to reproduce, prepare derivative
        !            15:  * works, and perform publicly and display publicly.  Beginning five
        !            16:  * (5) years after the date permission to assert copyright is obtained
        !            17:  * from the U.S. Department of Energy, and subject to any subsequent
        !            18:  * five (5) year renewals, the U.S. Government is granted for itself
        !            19:  * and others acting on its behalf a paid-up, nonexclusive,
        !            20:  * irrevocable, worldwide license in the Software to reproduce,
        !            21:  * prepare derivative works, distribute copies to the public, perform
        !            22:  * publicly and display publicly, and to permit others to do so.
        !            23:  *
        !            24:  * This code is distributed under a BSD style license, see the LICENSE
        !            25:  * file for complete information.
        !            26:  */
        !            27: 
        !            28: 
        !            29: #include <stddef.h>
        !            30: 
        !            31: #include "iperf_config.h"
        !            32: #include "iperf_time.h"
        !            33: 
        !            34: #ifdef HAVE_CLOCK_GETTIME
        !            35: 
        !            36: #include <time.h>
        !            37: 
        !            38: int
        !            39: iperf_time_now(struct iperf_time *time1)
        !            40: {
        !            41:     struct timespec ts;
        !            42:     int result;
        !            43:     result = clock_gettime(CLOCK_MONOTONIC, &ts);
        !            44:     if (result == 0) {
        !            45:         time1->secs = (uint32_t) ts.tv_sec;
        !            46:         time1->usecs = (uint32_t) ts.tv_nsec / 1000;
        !            47:     }
        !            48:     return result;
        !            49: }
        !            50: 
        !            51: #else
        !            52: 
        !            53: #include <sys/time.h>
        !            54: 
        !            55: int
        !            56: iperf_time_now(struct iperf_time *time1)
        !            57: {
        !            58:     struct timeval tv;
        !            59:     int result;
        !            60:     result = gettimeofday(&tv, NULL);
        !            61:     time1->secs = tv.tv_sec;
        !            62:     time1->usecs = tv.tv_usec;
        !            63:     return result;
        !            64: }
        !            65: 
        !            66: #endif
        !            67: 
        !            68: /* iperf_time_add_usecs
        !            69:  *
        !            70:  * Add a number of microseconds to a iperf_time.
        !            71:  */
        !            72: void
        !            73: iperf_time_add_usecs(struct iperf_time *time1, uint64_t usecs)
        !            74: {
        !            75:     time1->secs += usecs / 1000000L;
        !            76:     time1->usecs += usecs % 1000000L;
        !            77:     if ( time1->usecs >= 1000000L ) {
        !            78:         time1->secs += time1->usecs / 1000000L;
        !            79:         time1->usecs %= 1000000L;
        !            80:     }
        !            81: }
        !            82: 
        !            83: uint64_t
        !            84: iperf_time_in_usecs(struct iperf_time *time)
        !            85: {
        !            86:     return time->secs * 1000000LL + time->usecs;
        !            87: }
        !            88: 
        !            89: double
        !            90: iperf_time_in_secs(struct iperf_time *time)
        !            91: {
        !            92:     return time->secs + time->usecs / 1000000.0; 
        !            93: }
        !            94: 
        !            95: /* iperf_time_compare
        !            96:  *
        !            97:  * Compare two timestamps
        !            98:  * 
        !            99:  * Returns -1 if time1 is earlier, 1 if time1 is later,
        !           100:  * or 0 if the timestamps are equal.
        !           101:  */
        !           102: int
        !           103: iperf_time_compare(struct iperf_time *time1, struct iperf_time *time2)
        !           104: {
        !           105:     if (time1->secs < time2->secs)
        !           106:         return -1;
        !           107:     if (time1->secs > time2->secs)
        !           108:         return 1;
        !           109:     if (time1->usecs < time2->usecs)
        !           110:         return -1;
        !           111:     if (time1->usecs > time2->usecs)
        !           112:         return 1;
        !           113:     return 0;
        !           114: }
        !           115: 
        !           116: /* iperf_time_diff
        !           117:  *
        !           118:  * Calculates the time from time2 to time1, assuming time1 is later than time2.
        !           119:  * The diff will always be positive, so the return value should be checked
        !           120:  * to determine if time1 was earlier than time2.
        !           121:  *
        !           122:  * Returns 1 if the time1 is less than or equal to time2, otherwise 0.
        !           123:  */
        !           124: int 
        !           125: iperf_time_diff(struct iperf_time *time1, struct iperf_time *time2, struct iperf_time *diff)
        !           126: {
        !           127:     int past = 0;
        !           128:     int cmp = 0;
        !           129: 
        !           130:     cmp = iperf_time_compare(time1, time2);
        !           131:     if (cmp == 0) {
        !           132:         diff->secs = 0;
        !           133:         diff->usecs = 0;
        !           134:         past = 1;
        !           135:     } 
        !           136:     else if (cmp == 1) {
        !           137:         diff->secs = time1->secs - time2->secs;
        !           138:         diff->usecs = time1->usecs;
        !           139:         if (diff->usecs < time2->usecs) {
        !           140:             diff->secs -= 1;
        !           141:             diff->usecs += 1000000;
        !           142:         }
        !           143:         diff->usecs = diff->usecs - time2->usecs;
        !           144:     } else {
        !           145:         diff->secs = time2->secs - time1->secs;
        !           146:         diff->usecs = time2->usecs;
        !           147:         if (diff->usecs < time1->usecs) {
        !           148:             diff->secs -= 1;
        !           149:             diff->usecs += 1000000;
        !           150:         }
        !           151:         diff->usecs = diff->usecs - time1->usecs;
        !           152:         past = 1;
        !           153:     }
        !           154: 
        !           155:     return past;
        !           156: }