[DTrace-devel] [PATCH 3/4] test: Convert tick-* probes to write:entry probes for trunc() test

[eugene.loh at oracle.com]

From: Eugene Loh <eugene.loh at oracle.com>

In commit 07a56e29b6c1
"test: Convert tick-* probes to write:entry probes for clear() tests",
clear() tests were cleaned up because they rely on tricky interactions
between the producer and consumer.  Make the same change here for a
trunc() test that has been seen to be similarly vulnerable.

Signed-off-by: Eugene Loh <eugene.loh at oracle.com>
---
 test/unittest/aggs/tst.trunc0.d | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/test/unittest/aggs/tst.trunc0.d b/test/unittest/aggs/tst.trunc0.d
index fb5adbef..7686d019 100644
--- a/test/unittest/aggs/tst.trunc0.d
+++ b/test/unittest/aggs/tst.trunc0.d
@@ -1,32 +1,36 @@
 /*
  * Oracle Linux DTrace.
- * Copyright (c) 2006, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 2023, Oracle and/or its affiliates. All rights reserved.
  * Licensed under the Universal Permissive License v 1.0 as shown at
  * http://oss.oracle.com/licenses/upl.
  */
+/* @@trigger: periodic_output */
+/* @@nosort */
 
 #pragma D option quiet
 #pragma D option aggrate=1ms
 #pragma D option switchrate=50ms
 
-int i;
-
-tick-100ms
-/i < 10/
-{
-	@[i] = sum(10 - i);
-	i++;
-}
-
-tick-100ms
-/i == 5/
+BEGIN
 {
+	n = 0;
+	i = 0; @[i] = sum(10 - i);
+	i = 1; @[i] = sum(10 - i);
+	i = 2; @[i] = sum(10 - i);
+	i = 3; @[i] = sum(10 - i);
+	i = 4; @[i] = sum(10 - i);
 	trunc(@);
 }
 
-tick-100ms
-/i == 10/
+/* Wait for the trunc() to be performed by the consumer. */
+syscall::write:entry
+/pid == $target && n++ == 2/
 {
+	i = 5; @[i] = sum(10 - i);
+	i = 6; @[i] = sum(10 - i);
+	i = 7; @[i] = sum(10 - i);
+	i = 8; @[i] = sum(10 - i);
+	i = 9; @[i] = sum(10 - i);
 	exit(0);
 }
 
-- 
2.18.4