uschindler commented on PR #816:
URL: https://github.com/apache/lucene/pull/816#issuecomment-1110778339
Something like:
```java
private final Lock readLock, writeLock;
CloseableThreadLocal#ctor() {
super();
var rwLock = new ReadWriteLock();
this readLock = rwLock.readLock();
this.writeLock = rwLock.writeLock();
//... more init here
}
// later in get() when reading instead of synchronized::
readLock.lock();
try {
// read value for current thread
} finally {
readLock.unlock();
}
// later when cleaning up and modifiying map instead of synchronized:
writeLock.lock();
try {
// modify the map and clean up / purge threads
} finally {
writeLock.unlock();
}
```
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