getsentry · Zylphrex · Jun 19, 2025 · Jun 18, 2025
@@ -236,6 +236,7 @@ def __init__(self, frequency, options, sdk_info, capture_func):
         self.pid = None  # type: Optional[int]
 
         self.running = False
+        self.soft_shutdown = False
 
         self.new_profiles = deque(maxlen=128)  # type: Deque[ContinuousProfile]
         self.active_profiles = set()  # type: Set[ContinuousProfile]
@@ -317,24 +318,23 @@ def profiler_id(self):
         return self.buffer.profiler_id
 
     def make_sampler(self):
-        # type: () -> Callable[..., None]
+        # type: () -> Callable[..., bool]
         cwd = os.getcwd()
 
         cache = LRUCache(max_size=256)
 
         if self.lifecycle == "trace":
 
             def _sample_stack(*args, **kwargs):
-                # type: (*Any, **Any) -> None
+                # type: (*Any, **Any) -> bool
                 """
                 Take a sample of the stack on all the threads in the process.
                 This should be called at a regular interval to collect samples.
                 """
 
                 # no profiles taking place, so we can stop early
                 if not self.new_profiles and not self.active_profiles:
-                    self.running = False
-                    return
+                    return True
 
                 # This is the number of profiles we want to pop off.
                 # It's possible another thread adds a new profile to
@@ -357,7 +357,7 @@ def _sample_stack(*args, **kwargs):
                     # For some reason, the frame we get doesn't have certain attributes.
                     # When this happens, we abandon the current sample as it's bad.
                     capture_internal_exception(sys.exc_info())
-                    return
+                    return False
 
                 # Move the new profiles into the active_profiles set.
                 #
@@ -374,9 +374,7 @@ def _sample_stack(*args, **kwargs):
                 inactive_profiles = []
 
                 for profile in self.active_profiles:
-                    if profile.active:
-                        pass
-                    else:
+                    if not profile.active:
                         # If a profile is marked inactive, we buffer it
                         # to `inactive_profiles` so it can be removed.
                         # We cannot remove it here as it would result
@@ -389,10 +387,12 @@ def _sample_stack(*args, **kwargs):
                 if self.buffer is not None:
                     self.buffer.write(ts, sample)
 
+                return False
+
         else:
 
             def _sample_stack(*args, **kwargs):
-                # type: (*Any, **Any) -> None
+                # type: (*Any, **Any) -> bool
                 """
                 Take a sample of the stack on all the threads in the process.
                 This should be called at a regular interval to collect samples.
@@ -409,19 +409,21 @@ def _sample_stack(*args, **kwargs):
                     # For some reason, the frame we get doesn't have certain attributes.
                     # When this happens, we abandon the current sample as it's bad.
                     capture_internal_exception(sys.exc_info())
-                    return
+                    return False
 
                 if self.buffer is not None:
                     self.buffer.write(ts, sample)
 
+                return False
+
         return _sample_stack
 
     def run(self):
         # type: () -> None
         last = time.perf_counter()
 
         while self.running:
-            self.sampler()
+            self.soft_shutdown = self.sampler()
 
             # some time may have elapsed since the last time
             # we sampled, so we need to account for that and
@@ -430,6 +432,15 @@ def run(self):
             if elapsed < self.interval:
                 thread_sleep(self.interval - elapsed)
 
+            # the soft shutdown happens here to give it a chance
+            # for the profiler to be reused
+            if self.soft_shutdown:
+                self.running = False
+
+                # make sure to explicitly exit the profiler here or there might
+                # be multiple profilers at once
+                break
+
             # after sleeping, make sure to take the current
             # timestamp so we can use it next iteration
             last = time.perf_counter()
@@ -458,6 +469,8 @@ def __init__(self, frequency, options, sdk_info, capture_func):
     def ensure_running(self):
         # type: () -> None
 
+        self.soft_shutdown = False
+
         pid = os.getpid()
 
         # is running on the right process
@@ -532,6 +545,9 @@ def __init__(self, frequency, options, sdk_info, capture_func):
 
     def ensure_running(self):
         # type: () -> None
+
+        self.soft_shutdown = False
+
         pid = os.getpid()
 
         # is running on the right process

@@ -459,33 +459,54 @@ def test_continuous_profiler_auto_start_and_stop_sampled(
 
     thread = threading.current_thread()
 
+    all_profiler_ids = set()
+
     for _ in range(3):
         envelopes.clear()
 
+        profiler_ids = set()
+
         with sentry_sdk.start_transaction(name="profiling 1"):
-            assert get_profiler_id() is not None, "profiler should be running"
+            profiler_id = get_profiler_id()
+            assert profiler_id is not None, "profiler should be running"
+            profiler_ids.add(profiler_id)
             with sentry_sdk.start_span(op="op"):
                 time.sleep(0.1)
-            assert get_profiler_id() is not None, "profiler should be running"
+            profiler_id = get_profiler_id()
+            assert profiler_id is not None, "profiler should be running"
+            profiler_ids.add(profiler_id)
+
+        time.sleep(0.03)
 
         # the profiler takes a while to stop in auto mode so if we start
         # a transaction immediately, it'll be part of the same chunk
-        assert get_profiler_id() is not None, "profiler should be running"
+        profiler_id = get_profiler_id()
+        assert profiler_id is not None, "profiler should be running"
+        profiler_ids.add(profiler_id)
 
         with sentry_sdk.start_transaction(name="profiling 2"):
-            assert get_profiler_id() is not None, "profiler should be running"
+            profiler_id = get_profiler_id()
+            assert profiler_id is not None, "profiler should be running"
+            profiler_ids.add(profiler_id)
             with sentry_sdk.start_span(op="op"):
                 time.sleep(0.1)
-            assert get_profiler_id() is not None, "profiler should be running"
+            profiler_id = get_profiler_id()
+            assert profiler_id is not None, "profiler should be running"
+            profiler_ids.add(profiler_id)
 
         # wait at least 1 cycle for the profiler to stop
         time.sleep(0.2)
         assert get_profiler_id() is None, "profiler should not be running"
 
+        assert len(profiler_ids) == 1
+        all_profiler_ids.add(profiler_ids.pop())
+
         assert_single_transaction_with_profile_chunks(
             envelopes, thread, max_chunks=1, transactions=2
         )
 
+    assert len(all_profiler_ids) == 3
+
 
 @pytest.mark.parametrize(
     "mode",