Comments (7)
AFAIk hidapi is not thread-safe on neither of supported platforms
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Do you have any links/documentation where they talk about thread safety? I find it very weird that it crashes even when the threads are properly synchronized. And it only happens in one specific os/arch combination, not on x86 macos or arm linux.
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Hm, I might be wrong. I only found this 11 years old comment: signal11/hidapi#56 (comment)
On Linux and Mac, HIDAPI is fully thread-safe.
On Windows, it mostly is. You should be able to read and write at the same time like you're saying. One thing that won't work is using hid_close() to stop a hid_read() which is on another thread.
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@afilini do you see the same failure with the following code?
import hid
import threading
def e():
m.acquire()
print(hid.enumerate())
m.release()
m = threading.Lock()
a = threading.Thread(target=e, args=())
b = threading.Thread(target=e, args=())
c = threading.Thread(target=e, args=())
a.start()
b.start()
c.start()
a.join()
b.join()
c.join()
If yes, we can close this issue and open a new one in https://github.com/trezor/cython-hidapi because the issue is not in hwi but rather in cython-hidapi.
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Yep, same issue
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Closing as this is an usptream issue.
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Created trezor/cython-hidapi#148 to continue there
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