Fix stop_profile does not wait for finishing (#4741)

python/sglang/srt/managers/scheduler.py

@@ -1512,7 +1512,7 @@ class Scheduler(
             self.profiler_target_forward_ct
             and self.profiler_target_forward_ct <= self.forward_ct
         ):
-            self.stop_profile()
+            self.send_to_tokenizer.send_pyobj(self.stop_profile())
 
         if self.forward_sleep_time is not None:
             logger.info(f"Scheduler.run_batch sleep {self.forward_sleep_time}s")
@@ -2114,7 +2114,10 @@ class Scheduler(
 
     def stop_profile(self) -> None:
         if self.profiler_activities is None:
-            return
+            return ProfileReqOutput(
+                success=False,
+                message="Profiling is not in progress. Call /start_profile first.",
+            )
 
         logger.info("Stop profiling...")
         if self.torch_profiler is not None:
@@ -2145,10 +2148,7 @@ class Scheduler(
         self.torch_profiler_output_dir = None
         self.profiler_activities = None
 
-        if self.profiler_target_forward_ct:
-            self.send_to_tokenizer.send_pyobj(
-                ProfileReqOutput(success=True, message="Succeeded.")
-            )
+        return ProfileReqOutput(success=True, message="Succeeded")
 
     def expert_distribution_handle(self, recv_req: ExpertDistributionReq):
         if recv_req == ExpertDistributionReq.START_RECORD: