change: adding check for main thread

src/braket/simulator_v2/base_simulator_v2.py

@@ -1,5 +1,6 @@
 import sys
 import warnings
+import threading
 from collections.abc import Sequence
 from typing import Any, Optional, Union
 
@@ -92,6 +93,7 @@ def run_jaqcd(
                 as a result type when shots=0. Or, if StateVector and Amplitude result types
                 are requested when shots>0.
         """
+        _validate_thread()
         if qubit_count is not None:
             warnings.warn(
                 f"qubit_count is deprecated for {type(self).__name__} and can be set to None"
@@ -155,6 +157,7 @@ def run_openqasm(
                 as a result type when shots=0. Or, if StateVector and Amplitude result types
                 are requested when shots>0.
         """
+        _validate_thread()
         try:
             r = jl.simulate(self._device, self._openqasm_to_jl(openqasm_ir), shots)
         except JuliaError as e:
@@ -200,6 +203,7 @@ def run_multiple(
             list[GateModelTaskResult]: A list of result objects, with the ith object being
             the result of the ith program.
         """
+        _validate_thread()
         try:
             results = jl.simulate(
                 self._device,
@@ -245,6 +249,14 @@ def _validate_jaqcd(self, circuit_ir, qubit_count: int, shots: int):
             )
 
 
+def _validate_thread():
+    if threading.current_thread() is not threading.main_thread():
+        raise RuntimeError(
+            "Simulations must be run from the Main thread. "
+            "For multiple simulations, please use run_batch() instead."
+        )
+
+
 def _result_value_to_ndarray(
     task_result: GateModelTaskResult,
 ) -> GateModelTaskResult: