Benny Prijono | 4766ffe | 2005-11-01 17:56:59 +0000 | [diff] [blame^] | 1 | /* $Id$ |
| 2 | * |
Benny Prijono | dd859a6 | 2005-11-01 16:42:51 +0000 | [diff] [blame] | 3 | */ |
| 4 | #include <pj/os.h> |
| 5 | #include <pj/errno.h> |
| 6 | #include <stdio.h> |
| 7 | #include <string.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <ctype.h> |
| 10 | |
| 11 | #if defined(PJ_HAS_PENTIUM) && PJ_HAS_PENTIUM!=0 |
| 12 | static int machine_speed_mhz; |
| 13 | static pj_timestamp machine_speed; |
| 14 | |
| 15 | static __inline__ unsigned long long int rdtsc() |
| 16 | { |
| 17 | unsigned long long int x; |
| 18 | __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x)); |
| 19 | return x; |
| 20 | } |
| 21 | |
| 22 | /* Determine machine's CPU MHz to get the counter's frequency. |
| 23 | */ |
| 24 | static int get_machine_speed_mhz() |
| 25 | { |
| 26 | FILE *strm; |
| 27 | char buf[512]; |
| 28 | int len; |
| 29 | char *pos, *end; |
| 30 | |
| 31 | PJ_CHECK_STACK(); |
| 32 | |
| 33 | /* Open /proc/cpuinfo and read the file */ |
| 34 | strm = fopen("/proc/cpuinfo", "r"); |
| 35 | if (!strm) |
| 36 | return -1; |
| 37 | len = fread(buf, 1, sizeof(buf), strm); |
| 38 | fclose(strm); |
| 39 | if (len < 1) { |
| 40 | return -1; |
| 41 | } |
| 42 | buf[len] = '\0'; |
| 43 | |
| 44 | /* Locate the MHz digit. */ |
| 45 | pos = strstr(buf, "cpu MHz"); |
| 46 | if (!pos) |
| 47 | return -1; |
| 48 | pos = strchr(pos, ':'); |
| 49 | if (!pos) |
| 50 | return -1; |
| 51 | end = (pos += 2); |
| 52 | while (isdigit(*end)) ++end; |
| 53 | *end = '\0'; |
| 54 | |
| 55 | /* Return the Mhz part, and give it a +1. */ |
| 56 | return atoi(pos)+1; |
| 57 | } |
| 58 | |
| 59 | PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts) |
| 60 | { |
| 61 | if (machine_speed_mhz == 0) { |
| 62 | machine_speed_mhz = get_machine_speed_mhz(); |
| 63 | if (machine_speed_mhz > 0) { |
| 64 | machine_speed.u64 = machine_speed_mhz * 1000000.0; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | if (machine_speed_mhz == -1) { |
| 69 | ts->u64 = 0; |
| 70 | return -1; |
| 71 | } |
| 72 | ts->u64 = rdtsc(); |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq) |
| 77 | { |
| 78 | if (machine_speed_mhz == 0) { |
| 79 | machine_speed_mhz = get_machine_speed_mhz(); |
| 80 | if (machine_speed_mhz > 0) { |
| 81 | machine_speed.u64 = machine_speed_mhz * 1000000.0; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | if (machine_speed_mhz == -1) { |
| 86 | freq->u64 = 1; /* return 1 to prevent division by zero in apps. */ |
| 87 | return -1; |
| 88 | } |
| 89 | |
| 90 | freq->u64 = machine_speed.u64; |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | #else |
| 95 | #include <sys/time.h> |
| 96 | #include <errno.h> |
| 97 | |
| 98 | #define USEC_PER_SEC 1000000 |
| 99 | |
| 100 | PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts) |
| 101 | { |
| 102 | struct timeval tv; |
| 103 | |
| 104 | if (gettimeofday(&tv, NULL) != 0) { |
| 105 | return PJ_RETURN_OS_ERROR(pj_get_native_os_error()); |
| 106 | } |
| 107 | |
| 108 | ts->u64 = tv.tv_sec; |
| 109 | ts->u64 *= USEC_PER_SEC; |
| 110 | ts->u64 += tv.tv_usec; |
| 111 | |
| 112 | return PJ_SUCCESS; |
| 113 | } |
| 114 | |
| 115 | PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq) |
| 116 | { |
| 117 | freq->u32.hi = 0; |
| 118 | freq->u32.lo = USEC_PER_SEC; |
| 119 | |
| 120 | return PJ_SUCCESS; |
| 121 | } |
| 122 | |
| 123 | #endif |
| 124 | |