Python imp.lock_held() Examples

def test_main():        # magic name!  see above
    global N, done

    import imp
    if imp.lock_held():
        # This triggers on, e.g., from test import autotest.
        raise unittest.SkipTest("can't run when import lock is held")

    done.acquire()
    for N in (20, 50) * 3:
        if verbose:
            print "Trying", N, "threads ...",
        for i in range(N):
            thread.start_new_thread(task, ())
        done.acquire()
        if verbose:
            print "OK."
    done.release()

    test_import_hangers() 

def test_main():        # magic name!  see above
    global N, done

    import imp
    if imp.lock_held():
        # This triggers on, e.g., from test import autotest.
        raise unittest.SkipTest("can't run when import lock is held")

    done.acquire()
    for N in (20, 50) * 3:
        if verbose:
            print "Trying", N, "threads ...",
        for i in range(N):
            thread.start_new_thread(task, ())
        done.acquire()
        if verbose:
            print "OK."
    done.release()

    test_import_hangers() 

def test_main():        # magic name!  see above
    global N, done

    import imp
    if imp.lock_held():
        # This triggers on, e.g., from test import autotest.
        raise unittest.SkipTest("can't run when import lock is held")

    done.acquire()
    for N in (20, 50) * 3:
        if verbose:
            print "Trying", N, "threads ...",
        for i in range(N):
            thread.start_new_thread(task, ())
        done.acquire()
        if verbose:
            print "OK."
    done.release()

    test_import_hangers() 

def test_main():        # magic name!  see above
    global N, done

    import imp
    if imp.lock_held():
        # This triggers on, e.g., from test import autotest.
        raise unittest.SkipTest("can't run when import lock is held")

    done.acquire()
    for N in (20, 50) * 3:
        if verbose:
            print "Trying", N, "threads ...",
        for i in range(N):
            thread.start_new_thread(task, ())
        done.acquire()
        if verbose:
            print "OK."
    done.release()

    test_import_hangers() 

def test_main():        # magic name!  see above
    global N, done

    import imp
    if imp.lock_held():
        # This triggers on, e.g., from test import autotest.
        raise unittest.SkipTest("can't run when import lock is held")

    done.acquire()
    for N in (20, 50) * 3:
        if verbose:
            print "Trying", N, "threads ...",
        for i in range(N):
            thread.start_new_thread(task, ())
        done.acquire()
        if verbose:
            print "OK."
    done.release()

    test_import_hangers() 

def test_main():        # magic name!  see above
    global N, done

    import imp
    if imp.lock_held():
        # This triggers on, e.g., from test import autotest.
        raise unittest.SkipTest("can't run when import lock is held")

    done.acquire()
    for N in (20, 50) * 3:
        if verbose:
            print "Trying", N, "threads ...",
        for i in range(N):
            thread.start_new_thread(task, ())
        done.acquire()
        if verbose:
            print "OK."
    done.release()

    test_import_hangers() 

def test_main():        # magic name!  see above
    global N, done

    import imp
    if imp.lock_held():
        # This triggers on, e.g., from test import autotest.
        raise TestSkipped("can't run when import lock is held")

    done.acquire()
    for N in (20, 50) * 3:
        if verbose:
            print "Trying", N, "threads ...",
        for i in range(N):
            thread.start_new_thread(task, ())
        done.acquire()
        if verbose:
            print "OK."
    done.release()

    test_import_hangers() 

def verify_lock_state(self, expected):
        self.assertEqual(imp.lock_held(), expected,
                             "expected imp.lock_held() to be %r" % expected) 

def testLock(self):
        LOOPS = 50

        # The import lock may already be held, e.g. if the test suite is run
        # via "import test.autotest".
        lock_held_at_start = imp.lock_held()
        self.verify_lock_state(lock_held_at_start)

        for i in range(LOOPS):
            imp.acquire_lock()
            self.verify_lock_state(True)

        for i in range(LOOPS):
            imp.release_lock()

        # The original state should be restored now.
        self.verify_lock_state(lock_held_at_start)

        if not lock_held_at_start:
            try:
                imp.release_lock()
            except RuntimeError:
                pass
            else:
                self.fail("release_lock() without lock should raise "
                            "RuntimeError") 

def testLock(self):
        LOOPS = 50

        # The import lock may already be held, e.g. if the test suite is run
        # via "import test.autotest".
        lock_held_at_start = imp.lock_held()
        self.verify_lock_state(lock_held_at_start)

        for i in range(LOOPS):
            imp.acquire_lock()
            self.verify_lock_state(True)

        for i in range(LOOPS):
            imp.release_lock()

        # The original state should be restored now.
        self.verify_lock_state(lock_held_at_start)

        if not lock_held_at_start:
            try:
                imp.release_lock()
            except RuntimeError:
                pass
            else:
                self.fail("release_lock() without lock should raise "
                            "RuntimeError") 

def apply(self, library_name, inputhash, dry_run = False):
        """
        Changes the state of the system according to what the module
        specified does

        Keyword arguments:
            library_name -- the python module to load
            inputhash -- the list of dictionaries of config for the library
            dry_run -- whether or not to actually change the system
        """
        log.debug('entering state.apply %s', [library_name, inputhash, dry_run])
        if library_name not in sys.modules:
            try:
                imp.acquire_lock()
                mod = imp.find_module(library_name, self.libraries)
                imp.load_module(library_name, *mod)
            except ImportError:
                log.exception("Couldn't find module %s in dirs %s", library_name, self.libraries)
                raise
            finally:
                if imp.lock_held():
                    imp.release_lock()
        log.debug('loading library: %s', library_name)
        library = importlib.import_module(library_name)
        schema = library.schema()

        for item in inputhash:
            jsonschema.validate(item, schema)

        failed = library.verify(inputhashes=inputhash, log=log)
        log.debug('dry run: %s', dry_run) 
        if not dry_run:
            log.debug('applying state...')
            library.apply(inputhashes=failed, log=log)
            failed = library.verify(inputhashes=inputhash, log=log)
            if len(failed) > 0:
                log.error("Failed for good on {}".format(failed))
        log.debug('Leaving state.apply %s', failed)
        return failed 

def post_process(self):
        try:
            # set file name
            if self.output == '':
                self.output = self.input[0:-len(self.input.split('.')[-1])-1]+'_out.'+self.input.split('.')[-1]
            # open file for output
            output_file = io.open(self.output, 'w', encoding=self.writeEncoding)
            # write post-processed code to file
            output_file.write(self.__outputBuffer)
        finally:
            output_file.close()

        if self.run:
            # if this module is loaded as a library override the import
            if imp.lock_held() is True:
                self.override_import()
            else:
                self.on_the_fly()
        if not self.save:
            # remove tmp file
            if os.path.exists(self.output):
                os.remove(self.output)
        if not self.resume:
            # break execution so python doesn't
            # run the rest of the pre-processed code
            sys.exit(0)

    # postprocessor - override an import 

def verify_lock_state(self, expected):
        self.assertEqual(imp.lock_held(), expected,
                             "expected imp.lock_held() to be %r" % expected) 

def testLock(self):
        LOOPS = 50

        # The import lock may already be held, e.g. if the test suite is run
        # via "import test.autotest".
        lock_held_at_start = imp.lock_held()
        self.verify_lock_state(lock_held_at_start)

        for i in range(LOOPS):
            imp.acquire_lock()
            self.verify_lock_state(True)

        for i in range(LOOPS):
            imp.release_lock()

        # The original state should be restored now.
        self.verify_lock_state(lock_held_at_start)

        if not lock_held_at_start:
            try:
                imp.release_lock()
            except RuntimeError:
                pass
            else:
                self.fail("release_lock() without lock should raise "
                            "RuntimeError") 

def test_main():
    import imp
    if imp.lock_held():
        # If the import lock is held, the threads will hang.
        raise TestSkipped("can't run when import lock is held")

    try:
        testall()
    finally:
        cleanup()
    reap_children() 

def verify_lock_state(expected):
    if imp.lock_held() != expected:
        raise TestFailed("expected imp.lock_held() to be %r" % expected) 

def testLock():
    LOOPS = 50

    # The import lock may already be held, e.g. if the test suite is run
    # via "import test.autotest".
    lock_held_at_start = imp.lock_held()
    verify_lock_state(lock_held_at_start)

    for i in range(LOOPS):
        imp.acquire_lock()
        verify_lock_state(True)

    for i in range(LOOPS):
        imp.release_lock()

    # The original state should be restored now.
    verify_lock_state(lock_held_at_start)

    if not lock_held_at_start:
        try:
            imp.release_lock()
        except RuntimeError:
            pass
        else:
            raise TestFailed("release_lock() without lock should raise "
                             "RuntimeError") 

def test_main():
    if imp.lock_held():
        # If the import lock is held, the threads will hang
        raise unittest.SkipTest("can't run when import lock is held")

    test.test_support.run_unittest(SocketServerTest) 

def verify_lock_state(self, expected):
        self.assertEqual(imp.lock_held(), expected,
                             "expected imp.lock_held() to be %r" % expected) 

def testLock(self):
        LOOPS = 50

        # The import lock may already be held, e.g. if the test suite is run
        # via "import test.autotest".
        lock_held_at_start = imp.lock_held()
        self.verify_lock_state(lock_held_at_start)

        for i in range(LOOPS):
            imp.acquire_lock()
            self.verify_lock_state(True)

        for i in range(LOOPS):
            imp.release_lock()

        # The original state should be restored now.
        self.verify_lock_state(lock_held_at_start)

        if not lock_held_at_start:
            try:
                imp.release_lock()
            except RuntimeError:
                pass
            else:
                self.fail("release_lock() without lock should raise "
                            "RuntimeError") 

def test_main():
    if imp.lock_held():
        # If the import lock is held, the threads will hang
        raise unittest.SkipTest("can't run when import lock is held")

    test.test_support.run_unittest(SocketServerTest) 

def verify_lock_state(self, expected):
        self.assertEqual(imp.lock_held(), expected,
                             "expected imp.lock_held() to be %r" % expected) 

def test_lock(self):
        i=0
        while i<5:
            i+=1
            if not imp.lock_held():
                self.assertRaises(RuntimeError,imp.release_lock)
                imp.acquire_lock()
            else:
                imp.release_lock() 

def test_main():
    if imp.lock_held():
        # If the import lock is held, the threads will hang
        raise unittest.SkipTest("can't run when import lock is held")

    test.test_support.run_unittest(SocketServerTest) 

def verify_lock_state(self, expected):
        self.assertEqual(imp.lock_held(), expected,
                             "expected imp.lock_held() to be %r" % expected) 

def testLock(self):
        LOOPS = 50

        # The import lock may already be held, e.g. if the test suite is run
        # via "import test.autotest".
        lock_held_at_start = imp.lock_held()
        self.verify_lock_state(lock_held_at_start)

        for i in range(LOOPS):
            imp.acquire_lock()
            self.verify_lock_state(True)

        for i in range(LOOPS):
            imp.release_lock()

        # The original state should be restored now.
        self.verify_lock_state(lock_held_at_start)

        if not lock_held_at_start:
            try:
                imp.release_lock()
            except RuntimeError:
                pass
            else:
                self.fail("release_lock() without lock should raise "
                            "RuntimeError") 

def test_lock(self):
        i=0
        while i<5:
            i+=1
            if not imp.lock_held():
                self.assertRaises(RuntimeError,imp.release_lock)
                imp.acquire_lock()
            else:
                imp.release_lock() 

def test_main():
    if imp.lock_held():
        # If the import lock is held, the threads will hang
        raise unittest.SkipTest("can't run when import lock is held")

    test.test_support.run_unittest(SocketServerTest) 

def verify_lock_state(self, expected):
        self.assertEqual(imp.lock_held(), expected,
                             "expected imp.lock_held() to be %r" % expected) 

def testLock(self):
        LOOPS = 50

        # The import lock may already be held, e.g. if the test suite is run
        # via "import test.autotest".
        lock_held_at_start = imp.lock_held()
        self.verify_lock_state(lock_held_at_start)

        for i in range(LOOPS):
            imp.acquire_lock()
            self.verify_lock_state(True)

        for i in range(LOOPS):
            imp.release_lock()

        # The original state should be restored now.
        self.verify_lock_state(lock_held_at_start)

        if not lock_held_at_start:
            try:
                imp.release_lock()
            except RuntimeError:
                pass
            else:
                self.fail("release_lock() without lock should raise "
                            "RuntimeError")