Handle cancelation on EventFD.read

tests/test_ringbuf.py

@@ -4,7 +4,6 @@ import trio
 import pytest
 import tractor
 from tractor.ipc import (
-    EFD_NONBLOCK,
     open_eventfd,
     RingBuffSender,
     RingBuffReceiver
@@ -95,7 +94,7 @@ async def child_write_shm(
         'large_payloads_large_buffer',
     ]
 )
-def test_ring_buff(
+def test_ringbuf(
     msg_amount: int,
     rand_min: int,
     rand_max: int,
@@ -171,8 +170,7 @@ async def child_blocked_receiver(
 
 
 def test_ring_reader_cancel():
-    flags = EFD_NONBLOCK
-    write_eventfd = open_eventfd(flags=flags)
+    write_eventfd = open_eventfd()
     wrap_eventfd = open_eventfd()
 
     proc_kwargs = {
@@ -201,7 +199,6 @@ def test_ring_reader_cancel():
                     write_eventfd=write_eventfd,
                     wrap_eventfd=wrap_eventfd,
                     shm_key=shm_key,
-                    flags=flags
                 ) as (sctx, _sent),
             ):
                 await trio.sleep(1)

tractor/ipc/_linux.py

@@ -133,8 +133,10 @@ class EventFD:
         return write_eventfd(self._fd, value)
 
     async def read(self) -> int:
-        #TODO: how to handle signals?
-        return await trio.to_thread.run_sync(read_eventfd, self._fd)
+        return await trio.to_thread.run_sync(
+            read_eventfd, self._fd,
+            abandon_on_cancel=True
+        )
 
     def open(self):
         self._fobj = os.fdopen(self._fd, self._omode)

tractor/ipc/_ringbuf.py

@@ -45,7 +45,7 @@ class RingBuffSender(trio.abc.SendStream):
         wrap_eventfd: int,
         start_ptr: int = 0,
         buf_size: int = 10 * 1024,
-        clean_shm_on_exit: bool = True
+        unlink_on_exit: bool = True
     ):
         self._shm = SharedMemory(
             name=shm_key,
@@ -55,7 +55,7 @@ class RingBuffSender(trio.abc.SendStream):
         self._write_event = EventFD(write_eventfd, 'w')
         self._wrap_event = EventFD(wrap_eventfd, 'r')
         self._ptr = start_ptr
-        self.clean_shm_on_exit = clean_shm_on_exit
+        self.unlink_on_exit = unlink_on_exit
 
     @property
     def key(self) -> str:
@@ -104,7 +104,7 @@ class RingBuffSender(trio.abc.SendStream):
     async def aclose(self):
         self._write_event.close()
         self._wrap_event.close()
-        if self.clean_shm_on_exit:
+        if self.unlink_on_exit:
             self._shm.unlink()
 
         else: