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test: use C __atomic builtins for debug counters by fantix · Pull Request #719 · MagicStack/uvloop · GitHub

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test: use C __atomic builtins for debug counters #719

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Merged
fantix merged 2 commits into from
Jan 15, 2026
+20 −6
Conversation 0 Commits 2 Checks 17 Files changed 2
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test: use C __atomic builtins for debug counters #719

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39111e9
debug: use C __atomic builtins for counters
fantix Jan 15, 2026
4d56638
Also apply on timer handles
fantix Jan 15, 2026
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18 changes: 12 additions & 6 deletions uvloop/cbhandles.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,10 @@ cdef class Handle:
cdef inline _set_loop(self, Loop loop):
self.loop = loop
if UVLOOP_DEBUG:
loop._debug_cb_handles_total += 1
loop._debug_cb_handles_count += 1
system.__atomic_fetch_add(
&loop._debug_cb_handles_total, 1, system.__ATOMIC_RELAXED)
system.__atomic_fetch_add(
&loop._debug_cb_handles_count, 1, system.__ATOMIC_RELAXED)
if loop._debug:
self._source_traceback = extract_stack()

Expand All @@ -21,7 +23,8 @@ cdef class Handle:

def __dealloc__(self):
if UVLOOP_DEBUG and self.loop is not None:
self.loop._debug_cb_handles_count -= 1
system.__atomic_fetch_sub(
&self.loop._debug_cb_handles_count, 1, system.__ATOMIC_RELAXED)
if self.loop is None:
raise RuntimeError('Handle.loop is None in Handle.__dealloc__')

Expand Down Expand Up @@ -174,8 +177,10 @@ cdef class TimerHandle:
self._cancelled = 0

if UVLOOP_DEBUG:
self.loop._debug_cb_timer_handles_total += 1
self.loop._debug_cb_timer_handles_count += 1
system.__atomic_fetch_add(
&self.loop._debug_cb_timer_handles_total, 1, system.__ATOMIC_RELAXED)
system.__atomic_fetch_add(
&self.loop._debug_cb_timer_handles_count, 1, system.__ATOMIC_RELAXED)

if context is None:
context = Context_CopyCurrent()
Expand Down Expand Up @@ -205,7 +210,8 @@ cdef class TimerHandle:

def __dealloc__(self):
if UVLOOP_DEBUG:
self.loop._debug_cb_timer_handles_count -= 1
system.__atomic_fetch_sub(
&self.loop._debug_cb_timer_handles_count, 1, system.__ATOMIC_RELAXED)
if self.timer is not None:
raise RuntimeError('active TimerHandle is deallacating')

Expand Down
8 changes: 8 additions & 0 deletions uvloop/includes/system.pxd
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Original file line number Diff line number Diff line change
Expand Up @@ -94,3 +94,11 @@ cdef extern from "includes/fork_handler.h":
void setForkHandler(OnForkHandler handler)
void resetForkHandler()
void setMainThreadID(uint64_t id)


cdef extern from * nogil:
uint64_t __atomic_fetch_add(uint64_t *ptr, uint64_t val, int memorder)
uint64_t __atomic_fetch_sub(uint64_t *ptr, uint64_t val, int memorder)

cdef enum:
__ATOMIC_RELAXED
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