From e69a6799f4ae8416f1d2a9bea5ff159d6e3b1f9c Mon Sep 17 00:00:00 2001
From: meship-starkware <meshi@starkware.co>
Date: Thu, 7 Nov 2024 16:25:55 +0200
Subject: [PATCH] chore: check if a thread is still alive after the block is
 dead

---
 .../src/py_block_executor.rs                  | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/crates/native_blockifier/src/py_block_executor.rs b/crates/native_blockifier/src/py_block_executor.rs
index 7bf28040a1..67100cf3d3 100644
--- a/crates/native_blockifier/src/py_block_executor.rs
+++ b/crates/native_blockifier/src/py_block_executor.rs
@@ -33,6 +33,8 @@ use crate::storage::{PapyrusStorage, Storage, StorageConfig};
 pub(crate) type RawTransactionExecutionResult = Vec<u8>;
 pub(crate) type PyVisitedSegmentsMapping = Vec<(PyFelt, Vec<usize>)>;
 
+use std::sync::{Arc, Mutex};
+use std::thread::{self, JoinHandle};
 #[cfg(test)]
 #[path = "py_block_executor_test.rs"]
 mod py_block_executor_test;
@@ -124,6 +126,7 @@ pub struct PyBlockExecutor {
     /// `Send` trait is required for `pyclass` compatibility as Python objects must be threadsafe.
     pub storage: Box<dyn Storage + Send>,
     pub global_contract_cache: GlobalContractCache,
+    thread_handle: Option<Arc<Mutex<Option<JoinHandle<()>>>>>,
 }
 
 #[pymethods]
@@ -144,6 +147,13 @@ impl PyBlockExecutor {
         let versioned_constants =
             VersionedConstants::get_versioned_constants(py_versioned_constants_overrides.into());
         log::debug!("Initialized Block Executor.");
+        // Spawn a thread and store its handle
+        let thread_handle = Arc::new(Mutex::new(Some(thread::spawn(|| {
+            loop {
+                // Thread work here...
+                thread::sleep(std::time::Duration::from_secs(1));
+            }
+        }))));
 
         Self {
             bouncer_config: bouncer_config.try_into().expect("Failed to parse bouncer config."),
@@ -155,6 +165,7 @@ impl PyBlockExecutor {
             tx_executor: None,
             storage: Box::new(storage),
             global_contract_cache: GlobalContractCache::new(global_contract_cache_size),
+            thread_handle: Some(thread_handle),
         }
     }
 
@@ -245,6 +256,23 @@ impl PyBlockExecutor {
             })
             .collect();
 
+        let is_thread_alive = {
+            let wrapper_handle = self.thread_handle.clone().unwrap().clone();
+            let handle = wrapper_handle.lock().unwrap();
+            if let Some(handle) = handle.as_ref() {
+                handle.thread().unpark();
+                true
+            } else {
+                false
+            }
+        };
+
+        if is_thread_alive {
+            println!("Thread is still alive");
+        } else {
+            println!("Thread is not alive");
+        }
+
         // Convert to Py types and allocate it on Python's heap, to be visible for Python's
         // garbage collector.
         Python::with_gil(|py| {
@@ -391,6 +419,7 @@ impl PyBlockExecutor {
             versioned_constants,
             tx_executor: None,
             global_contract_cache: GlobalContractCache::new(GLOBAL_CONTRACT_CACHE_SIZE_FOR_TEST),
+            thread_handle: None,
         }
     }
 }
@@ -421,6 +450,7 @@ impl PyBlockExecutor {
             versioned_constants: VersionedConstants::latest_constants().clone(),
             tx_executor: None,
             global_contract_cache: GlobalContractCache::new(GLOBAL_CONTRACT_CACHE_SIZE_FOR_TEST),
+            thread_handle: None,
         }
     }