PEP 475: on EINTR, retry the function even if the timeout is equals to zero

Retry:

* signal.sigtimedwait()
* threading.Lock.acquire()
* threading.RLock.acquire()
* time.sleep()

Modules/_threadmodule.c

@@ -84,7 +84,7 @@ acquire_timed(PyThread_type_lock lock, _PyTime_t timeout)
 
                 /* Check for negative values, since those mean block forever.
                  */
-                if (timeout <= 0) {
+                if (timeout < 0) {
                     r = PY_LOCK_FAILURE;
                 }
             }

Modules/signalmodule.c

@@ -1011,7 +1011,7 @@ signal_sigtimedwait(PyObject *self, PyObject *args)
 
         monotonic = _PyTime_GetMonotonicClock();
         timeout = deadline - monotonic;
-        if (timeout <= 0)
+        if (timeout < 0)
             break;
     } while (1);
 

Modules/timemodule.c

@@ -1455,7 +1455,7 @@ pysleep(_PyTime_t secs)
 
         monotonic = _PyTime_GetMonotonicClock();
         secs = deadline - monotonic;
-        if (secs <= 00)
+        if (secs < 0)
             break;
         /* retry with the recomputed delay */
     } while (1);