| /*------------------------------------------------------------------------- |
| * |
| * instr_time.h |
| * portable high-precision interval timing |
| * |
| * This file provides an abstraction layer to hide portability issues in |
| * interval timing. On Unix we use gettimeofday(), but on Windows that |
| * gives a low-precision result so we must use QueryPerformanceCounter() |
| * instead. These macros also give some breathing room to use other |
| * high-precision-timing APIs on yet other platforms. |
| * |
| * The basic data type is instr_time, which all callers should treat as an |
| * opaque typedef. instr_time can store either an absolute time (of |
| * unspecified reference time) or an interval. The operations provided |
| * for it are: |
| * |
| * INSTR_TIME_IS_ZERO(t) is t equal to zero? |
| * |
| * INSTR_TIME_SET_ZERO(t) set t to zero (memset is acceptable too) |
| * |
| * INSTR_TIME_SET_CURRENT(t) set t to current time |
| * |
| * INSTR_TIME_ADD(x, y) x += y |
| * |
| * INSTR_TIME_SUBTRACT(x, y) x -= y |
| * |
| * INSTR_TIME_ACCUM_DIFF(x, y, z) x += (y - z) |
| * |
| * INSTR_TIME_GET_DOUBLE(t) convert t to double (in seconds) |
| * |
| * INSTR_TIME_GET_MILLISEC(t) convert t to double (in milliseconds) |
| * |
| * INSTR_TIME_GET_MICROSEC(t) convert t to uint64 (in microseconds) |
| * |
| * Note that INSTR_TIME_SUBTRACT and INSTR_TIME_ACCUM_DIFF convert |
| * absolute times to intervals. The INSTR_TIME_GET_xxx operations are |
| * only useful on intervals. |
| * |
| * When summing multiple measurements, it's recommended to leave the |
| * running sum in instr_time form (ie, use INSTR_TIME_ADD or |
| * INSTR_TIME_ACCUM_DIFF) and convert to a result format only at the end. |
| * |
| * Beware of multiple evaluations of the macro arguments. |
| * |
| * |
| * Copyright (c) 2001-2010, PostgreSQL Global Development Group |
| * |
| * $PostgreSQL: pgsql/src/include/portability/instr_time.h,v 1.6 2010/02/13 02:34:15 tgl Exp $ |
| * |
| *------------------------------------------------------------------------- |
| */ |
| #ifndef INSTR_TIME_H |
| #define INSTR_TIME_H |
| |
| #ifndef WIN32 |
| |
| #include <sys/time.h> |
| |
| typedef struct timeval instr_time; |
| |
| #define INSTR_TIME_IS_ZERO(t) ((t).tv_usec == 0 && (t).tv_sec == 0) |
| |
| #define INSTR_TIME_SET_ZERO(t) ((t).tv_sec = 0, (t).tv_usec = 0) |
| |
| #define INSTR_TIME_SET_CURRENT(t) gettimeofday(&(t), NULL) |
| |
| #define INSTR_TIME_ASSIGN(x,y) ((x).tv_sec = (y).tv_sec, (x).tv_usec = (y).tv_usec) |
| |
| #define INSTR_TIME_ADD(x,y) \ |
| do { \ |
| (x).tv_sec += (y).tv_sec; \ |
| (x).tv_usec += (y).tv_usec; \ |
| /* Normalize */ \ |
| while ((x).tv_usec >= 1000000) \ |
| { \ |
| (x).tv_usec -= 1000000; \ |
| (x).tv_sec++; \ |
| } \ |
| } while (0) |
| |
| #define INSTR_TIME_SUBTRACT(x,y) \ |
| do { \ |
| (x).tv_sec -= (y).tv_sec; \ |
| (x).tv_usec -= (y).tv_usec; \ |
| /* Normalize */ \ |
| while ((x).tv_usec < 0) \ |
| { \ |
| (x).tv_usec += 1000000; \ |
| (x).tv_sec--; \ |
| } \ |
| } while (0) |
| |
| #define INSTR_TIME_GREATER_THAN(x,y) \ |
| (((x).tv_sec > (y).tv_sec) || \ |
| (((x).tv_sec == (y).tv_sec) && ((x).tv_usec > (y).tv_usec))) |
| |
| #define INSTR_TIME_LESS_THAN(x,y) \ |
| (((x).tv_sec < (y).tv_sec) || \ |
| (((x).tv_sec == (y).tv_sec) && ((x).tv_usec < (y).tv_usec))) |
| |
| #define INSTR_TIME_ACCUM_DIFF(x,y,z) \ |
| do { \ |
| (x).tv_sec += (y).tv_sec - (z).tv_sec; \ |
| (x).tv_usec += (y).tv_usec - (z).tv_usec; \ |
| /* Normalize after each add to avoid overflow/underflow of tv_usec */ \ |
| while ((x).tv_usec < 0) \ |
| { \ |
| (x).tv_usec += 1000000; \ |
| (x).tv_sec--; \ |
| } \ |
| while ((x).tv_usec >= 1000000) \ |
| { \ |
| (x).tv_usec -= 1000000; \ |
| (x).tv_sec++; \ |
| } \ |
| } while (0) |
| |
| #define INSTR_TIME_GET_DOUBLE(t) \ |
| (((double) (t).tv_sec) + ((double) (t).tv_usec) / 1000000.0) |
| |
| #define INSTR_TIME_GET_MILLISEC(t) \ |
| (((double) (t).tv_sec * 1000.0) + ((double) (t).tv_usec) / 1000.0) |
| |
| #define INSTR_TIME_GET_MICROSEC(t) \ |
| (((uint64) (t).tv_sec * (uint64) 1000000) + (uint64) (t).tv_usec) |
| #else /* WIN32 */ |
| |
| typedef LARGE_INTEGER instr_time; |
| |
| #define INSTR_TIME_IS_ZERO(t) ((t).QuadPart == 0) |
| |
| #define INSTR_TIME_SET_ZERO(t) ((t).QuadPart = 0) |
| |
| #define INSTR_TIME_SET_CURRENT(t) QueryPerformanceCounter(&(t)) |
| |
| #define INSTR_TIME_ASSIGN(x,y) ((x).QuadPart = (y).QuadPart) |
| |
| #define INSTR_TIME_ADD(x,y) \ |
| ((x).QuadPart += (y).QuadPart) |
| |
| #define INSTR_TIME_SUBTRACT(x,y) \ |
| ((x).QuadPart -= (y).QuadPart) |
| |
| #define INSTR_TIME_GREATER_THAN(x,y) \ |
| ((x).QuadPart > (y).QuadPart) |
| |
| #define INSTR_TIME_LESS_THAN(x,y) \ |
| ((x).QuadPart < (y).QuadPart) |
| |
| #define INSTR_TIME_ACCUM_DIFF(x,y,z) \ |
| ((x).QuadPart += (y).QuadPart - (z).QuadPart) |
| |
| #define INSTR_TIME_GET_DOUBLE(t) \ |
| (((double) (t).QuadPart) / GetTimerFrequency()) |
| |
| #define INSTR_TIME_GET_MILLISEC(t) \ |
| (((double) (t).QuadPart * 1000.0) / GetTimerFrequency()) |
| |
| #define INSTR_TIME_GET_MICROSEC(t) \ |
| ((uint64) (((double) (t).QuadPart * 1000000.0) / GetTimerFrequency())) |
| |
| static inline double |
| GetTimerFrequency(void) |
| { |
| LARGE_INTEGER f; |
| |
| QueryPerformanceFrequency(&f); |
| return (double) f.QuadPart; |
| } |
| #endif /* WIN32 */ |
| |
| #define TIMING_BEGIN(begin) { \ |
| INSTR_TIME_SET_ZERO(begin); \ |
| INSTR_TIME_SET_CURRENT(begin); \ |
| { |
| |
| #define TIMING_END(end) } \ |
| INSTR_TIME_SET_CURRENT(end); \ |
| } |
| |
| #endif /* INSTR_TIME_H */ |