#!/usr/bin/env bash
# Confirms -Djdk.tracePinnedThreads=full is inert on this JDK (JEP 491, GA in JDK 24).
# Pre-JDK-24, this flag made a pinned virtual thread print a stack trace to stdout while
# pinned. Runs PinningTraceCheckMain (which holds a monitor across Thread.sleep(200) on a
# virtual thread) once without the flag and once with it, and diffs stdout. Output:
# docs/output/03b-trace-pinned-threads-removed.txt. See docs/03-pinning-diagnosis.md.
set -euo pipefail
cd "$(dirname "$0")/.."

mkdir -p docs/output
OUT=docs/output/03b-trace-pinned-threads-removed.txt

echo "java -version:" > "$OUT"
java -version 2>&1 | grep -v "^Picked up JAVA_TOOL_OPTIONS" >> "$OUT"
echo "" >> "$OUT"

echo "-- without -Djdk.tracePinnedThreads=full --" >> "$OUT"
java -cp target/classes com.ankurm.vthreads.PinningTraceCheckMain 2>&1 | grep -v "^Picked up JAVA_TOOL_OPTIONS" >> "$OUT"

echo "" >> "$OUT"
echo "-- with -Djdk.tracePinnedThreads=full --" >> "$OUT"
java -Djdk.tracePinnedThreads=full -cp target/classes com.ankurm.vthreads.PinningTraceCheckMain 2>&1 | grep -v "^Picked up JAVA_TOOL_OPTIONS" >> "$OUT"

echo "" >> "$OUT"
if grep -q "Thread\[#" "$OUT" && grep -qi "monitors:" "$OUT"; then
  echo "RESULT: a pinned-thread stack trace WAS printed -- flag still functional on this JDK" >> "$OUT"
else
  echo "RESULT: no pinned-thread stack trace was printed by either run -- the flag is inert on this JDK, consistent with JEP 491" >> "$OUT"
fi

cat "$OUT"