Benny Prijono | dd859a6 | 2005-11-01 16:42:51 +0000 | [diff] [blame^] | 1 | /* $Header: /pjproject-0.3/pjlib/src/pj/os_timestamp_linux.c 4 10/29/05 10:27p Bennylp $ */ |
| 2 | /* $Log: /pjproject-0.3/pjlib/src/pj/os_timestamp_linux.c $ |
| 3 | * |
| 4 | * 4 10/29/05 10:27p Bennylp |
| 5 | * Fixed misc warnings. |
| 6 | * |
| 7 | * 3 10/29/05 11:51a Bennylp |
| 8 | * Version 0.3-pre2. |
| 9 | * |
| 10 | * 2 9/21/05 1:39p Bennylp |
| 11 | * Periodic checkin for backup. |
| 12 | * |
| 13 | * 1 9/18/05 9:25p Bennylp |
| 14 | * Created. |
| 15 | * |
| 16 | */ |
| 17 | #include <pj/os.h> |
| 18 | #include <pj/errno.h> |
| 19 | #include <stdio.h> |
| 20 | #include <string.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <ctype.h> |
| 23 | |
| 24 | #if defined(PJ_HAS_PENTIUM) && PJ_HAS_PENTIUM!=0 |
| 25 | static int machine_speed_mhz; |
| 26 | static pj_timestamp machine_speed; |
| 27 | |
| 28 | static __inline__ unsigned long long int rdtsc() |
| 29 | { |
| 30 | unsigned long long int x; |
| 31 | __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x)); |
| 32 | return x; |
| 33 | } |
| 34 | |
| 35 | /* Determine machine's CPU MHz to get the counter's frequency. |
| 36 | */ |
| 37 | static int get_machine_speed_mhz() |
| 38 | { |
| 39 | FILE *strm; |
| 40 | char buf[512]; |
| 41 | int len; |
| 42 | char *pos, *end; |
| 43 | |
| 44 | PJ_CHECK_STACK(); |
| 45 | |
| 46 | /* Open /proc/cpuinfo and read the file */ |
| 47 | strm = fopen("/proc/cpuinfo", "r"); |
| 48 | if (!strm) |
| 49 | return -1; |
| 50 | len = fread(buf, 1, sizeof(buf), strm); |
| 51 | fclose(strm); |
| 52 | if (len < 1) { |
| 53 | return -1; |
| 54 | } |
| 55 | buf[len] = '\0'; |
| 56 | |
| 57 | /* Locate the MHz digit. */ |
| 58 | pos = strstr(buf, "cpu MHz"); |
| 59 | if (!pos) |
| 60 | return -1; |
| 61 | pos = strchr(pos, ':'); |
| 62 | if (!pos) |
| 63 | return -1; |
| 64 | end = (pos += 2); |
| 65 | while (isdigit(*end)) ++end; |
| 66 | *end = '\0'; |
| 67 | |
| 68 | /* Return the Mhz part, and give it a +1. */ |
| 69 | return atoi(pos)+1; |
| 70 | } |
| 71 | |
| 72 | PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts) |
| 73 | { |
| 74 | if (machine_speed_mhz == 0) { |
| 75 | machine_speed_mhz = get_machine_speed_mhz(); |
| 76 | if (machine_speed_mhz > 0) { |
| 77 | machine_speed.u64 = machine_speed_mhz * 1000000.0; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | if (machine_speed_mhz == -1) { |
| 82 | ts->u64 = 0; |
| 83 | return -1; |
| 84 | } |
| 85 | ts->u64 = rdtsc(); |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq) |
| 90 | { |
| 91 | if (machine_speed_mhz == 0) { |
| 92 | machine_speed_mhz = get_machine_speed_mhz(); |
| 93 | if (machine_speed_mhz > 0) { |
| 94 | machine_speed.u64 = machine_speed_mhz * 1000000.0; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | if (machine_speed_mhz == -1) { |
| 99 | freq->u64 = 1; /* return 1 to prevent division by zero in apps. */ |
| 100 | return -1; |
| 101 | } |
| 102 | |
| 103 | freq->u64 = machine_speed.u64; |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | #else |
| 108 | #include <sys/time.h> |
| 109 | #include <errno.h> |
| 110 | |
| 111 | #define USEC_PER_SEC 1000000 |
| 112 | |
| 113 | PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts) |
| 114 | { |
| 115 | struct timeval tv; |
| 116 | |
| 117 | if (gettimeofday(&tv, NULL) != 0) { |
| 118 | return PJ_RETURN_OS_ERROR(pj_get_native_os_error()); |
| 119 | } |
| 120 | |
| 121 | ts->u64 = tv.tv_sec; |
| 122 | ts->u64 *= USEC_PER_SEC; |
| 123 | ts->u64 += tv.tv_usec; |
| 124 | |
| 125 | return PJ_SUCCESS; |
| 126 | } |
| 127 | |
| 128 | PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq) |
| 129 | { |
| 130 | freq->u32.hi = 0; |
| 131 | freq->u32.lo = USEC_PER_SEC; |
| 132 | |
| 133 | return PJ_SUCCESS; |
| 134 | } |
| 135 | |
| 136 | #endif |
| 137 | |