From 0dcdbb6b1ad1121d2bdb2ba370060ef0519640b8 Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Fri, 20 Jan 2023 15:31:54 -0800 Subject: [PATCH v8 3/5] instr_time: Add INSTR_TIME_SET_SECONDS(), INSTR_TIME_IS_LT() INSTR_TIME_SET_SECONDS() is useful to calculate the end of a time-bound loop without having to convert into time units (which is costly). INSTR_TIME_IS_LT() can be used to check the loop condition. Author: Reviewed-by: Discussion: https://postgr.es/m/ Backpatch: --- src/include/portability/instr_time.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/src/include/portability/instr_time.h b/src/include/portability/instr_time.h index c0ed491395d..af2ab6ec887 100644 --- a/src/include/portability/instr_time.h +++ b/src/include/portability/instr_time.h @@ -15,6 +15,8 @@ * * INSTR_TIME_IS_ZERO(t) is t equal to zero? * + * INSTR_TIME_IS_LT(x, y) x < y + * * INSTR_TIME_SET_ZERO(t) set t to zero (memset is acceptable too) * * INSTR_TIME_SET_CURRENT(t) set t to current time @@ -22,6 +24,8 @@ * INSTR_TIME_SET_CURRENT_LAZY(t) set t to current time if t is zero, * evaluates to whether t changed * + * INSTR_TIME_SET_SECONDS(t, s) set t to s seconds + * * INSTR_TIME_ADD(x, y) x += y * * INSTR_TIME_SUBTRACT(x, y) x -= y @@ -122,6 +126,9 @@ pg_clock_gettime_ns(void) #define INSTR_TIME_SET_CURRENT(t) \ ((t) = pg_clock_gettime_ns()) +#define INSTR_TIME_SET_SECONDS(t, s) \ + ((t).ticks = NS_PER_S * (s)) + #define INSTR_TIME_GET_NANOSEC(t) \ ((int64) (t).ticks) @@ -156,6 +163,9 @@ GetTimerFrequency(void) #define INSTR_TIME_SET_CURRENT(t) \ ((t) = pg_query_performance_counter()) +#define INSTR_TIME_SET_SECONDS(t, s) \ + ((t).ticks = s * GetTimerFrequency()) + #define INSTR_TIME_GET_NANOSEC(t) \ ((int64) (((double) (t).ticks * NS_PER_S) / GetTimerFrequency())) @@ -168,6 +178,8 @@ GetTimerFrequency(void) #define INSTR_TIME_IS_ZERO(t) ((t).ticks == 0) +#define INSTR_TIME_IS_LT(x, y) ((x).ticks < (y).ticks) + #define INSTR_TIME_SET_ZERO(t) ((t).ticks = 0) -- 2.38.0