No select.EPOLLONESHOT under macOS about psycopg HOT 4 CLOSED

Ah I see.

Can you try to apply the following diff:

diff --git a/psycopg3/psycopg3/waiting.py b/psycopg3/psycopg3/waiting.py
index bfab413..e607024 100644
--- a/psycopg3/psycopg3/waiting.py
+++ b/psycopg3/psycopg3/waiting.py
@@ -196,13 +196,6 @@ async def wait_conn_async(gen: PQGenConn[RV]) -> RV:
         return rv
 
 
-poll_evmasks = {
-    Wait.R: select.EPOLLONESHOT | select.EPOLLIN,
-    Wait.W: select.EPOLLONESHOT | select.EPOLLOUT,
-    Wait.RW: select.EPOLLONESHOT | select.EPOLLIN | select.EPOLLOUT,
-}
-
-
 def wait_epoll(
     gen: PQGen[RV], fileno: int, timeout: Optional[float] = None
 ) -> RV:
@@ -247,5 +240,12 @@ if (
     is selectors.EpollSelector
 ):
     wait = wait_epoll
+
+    poll_evmasks = {
+        Wait.R: select.EPOLLONESHOT | select.EPOLLIN,
+        Wait.W: select.EPOLLONESHOT | select.EPOLLOUT,
+        Wait.RW: select.EPOLLONESHOT | select.EPOLLIN | select.EPOLLOUT,
+    }
+
 else:
     wait = wait_selector

If it work I'll commit it to master

from psycopg.

I have applied the diff to master. Please let us know if it fixes your problem. There might be others as macOS is untested

from psycopg.

The error changed. Now it is:

  File "/Users/jacopo/projects/pgtest/.venv/lib/python3.9/site-packages/psycopg3/waiting.py", line 240, in <module>
    is getattr(selectors, 'EpollSelector')
AttributeError: module 'selectors' has no attribute 'EpollSelector'

On my system dir(selector) shows these attributes:

'ABCMeta', 'BaseSelector', 'DefaultSelector', 'EVENT_READ', 'EVENT_WRITE', 'KqueueSelector', 'Mapping', 'PollSelector', 'SelectSelector', 'SelectorKey', '_BaseSelectorImpl', '_PollLikeSelector', '_SelectorMapping', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', '_can_use', '_fileobj_to_fd', 'abstractmethod', 'math', 'namedtuple', 'select', 'sys'

It seems epoll is available only on Linux, but if I change the code to getattr(selectors, 'EpollSelector', None) in the check then it falls back to wait_selector and I can run the example code without problems.

from psycopg.

Thank you, good to know. I will make this changeset too in master.

from psycopg.