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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Calling start() multiple times on a macos timer doesn't stop the previous timer","articleBody":"### Bug summary\n\nWhen calling `timer.start(); timer.start()` on an already running timer, the previous timer should be stopped before starting a new one. On the macosx backend this causes two timers to be running under the hood.\n\n### Code for reproduction\n\n```Python\nimport time\r\nimport matplotlib.pyplot as plt\r\n\r\ntimer = plt.figure().canvas.new_timer(interval=1000)\r\n\r\ntimer.add_callback(lambda: print(f\"{time.ctime()}\"))\r\ntimer.start()\r\ntimer.start()\r\n\r\nplt.pause(2)\n```\n\n\n### Actual outcome\n\n4 prints, 2 per second\r\n```\r\nTue Nov  5 09:07:27 2024\r\nTue Nov  5 09:07:27 2024\r\nTue Nov  5 09:07:28 2024\r\nTue Nov  5 09:07:28 2024\r\n```\n\n### Expected outcome\n\n2 prints, 1 per second\r\n```\r\nTue Nov  5 09:07:27 2024\r\nTue Nov  5 09:07:28 2024\r\n```\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nmacos\n\n### Matplotlib Version\n\nmain\n\n### Matplotlib Backend\n\nmacosx\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nNone","author":{"url":"https://github.com/greglucas","@type":"Person","name":"greglucas"},"datePublished":"2024-11-05T16:11:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/29076/matplotlib/issues/29076"}