Call getJobs in thread: PyEval_RestoreThread: NULL tstate #43
Description
Calling the function getJobs in a thread crash the application.
It seems that some functions are not thread-safe. How can I handle it?
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
self.run()
File "/usr/lib/python3.7/threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "test3.py", line 19, in print_jobs
"job-uri", "job-state"])))
cups.IPPError: (1280, 'No such file or directory')
Fatal Python error: PyEval_RestoreThread: NULL tstate
Current thread 0x76f6cad0 (most recent call first):
File "test3.py", line 34 in <module>
AbandonI'm using the following script to reproduce it:
import threading
import time
import cups
import os.path as osp
FILENAME = "test3.py"
RUN = True
def print_jobs():
time.sleep(1)
while RUN == True:
time.sleep(0.1)
print("Jobs count:", len(conn.getJobs(my_jobs=True, requested_attributes=["job-id", "job-name",
"job-uri", "job-state"])))
THREAD = threading.Thread(target=print_jobs)
THREAD.daemon = True
# Create a CUPS connection
conn = cups.Connection()
name = conn.getDefault()
try:
THREAD.start()
while True:
time.sleep(0.1)
conn.printFile(name, FILENAME, osp.basename(FILENAME), {})
except KeyboardInterrupt:
print("Stop")
finally:
print("Cancel tasks")
RUN = False
conn.cancelAllJobs(name)
THREAD.join()