Subject: [PATCH v8 3/5] instr_time: Add INSTR_TIME_SET_SECONDS(), INSTR_TIME_IS_LT()

From: Andres Freund <[email-masked]>
Date: Fri, 20 Jan 2023 15:31:54 -0800

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

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