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Make ensure_app() thread-safe

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Kovid Goyal 2014-09-14 16:03:30 +05:30
parent 7b4fdc0634
commit 681bec7ee0
1 changed files with 9 additions and 6 deletions
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15
src/calibre/gui2/__init__.py
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@ -2,7 +2,7 @@ __license__ = 'GPL v3'
__copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>' __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
""" The GUI """ """ The GUI """
import os, sys, Queue, threading, glob import os, sys, Queue, threading, glob
from threading import RLock from threading import RLock, Lock
from urllib import unquote from urllib import unquote
from PyQt5.Qt import ( from PyQt5.Qt import (
QFileInfo, QObject, QBuffer, Qt, QStyle, QByteArray, QTranslator, QFileInfo, QObject, QBuffer, Qt, QStyle, QByteArray, QTranslator,
@ -1122,13 +1122,16 @@ def open_local_file(path):
url = QUrl.fromLocalFile(path) url = QUrl.fromLocalFile(path)
open_url(url) open_url(url)
_ea_lock = Lock()
def ensure_app(): def ensure_app():
global _store_app global _store_app
if _store_app is None and QApplication.instance() is None: with _ea_lock:
args = sys.argv[:1] if _store_app is None and QApplication.instance() is None:
if islinux or isbsd: args = sys.argv[:1]
args += ['-platformpluginpath', sys.extensions_location, '-platform', 'headless'] if islinux or isbsd:
_store_app = QApplication(args) args += ['-platformpluginpath', sys.extensions_location, '-platform', 'headless']
_store_app = QApplication(args)
def must_use_qt(): def must_use_qt():
''' This function should be called if you want to use Qt for some non-GUI ''' This function should be called if you want to use Qt for some non-GUI