Call to `hid_read_timeout` sometimes never returns on Windows #652

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opened 2023-12-01 01:23:51 -06:00 by shufps · 1 comment

shufps commented

2023-12-01 01:23:51 -06:00

(Migrated from github.com)

We have an application that works perfectly on Linux and Mac and most of the time for Windows.

But on Windows it happens that the call to read_timeout never returns and the entire app is hanging because we are cleanly using mutexes to prevent parallel accessing the USB device.

We tracked our problem down to the call of hid_read_timeout

    fn read_timeout(&self, buf: &mut [u8], timeout: i32) -> HidResult<usize> {
        let res = unsafe {
            ffi::hid_read_timeout(
                self._hid_device,
                buf.as_mut_ptr(),
                buf.len() as size_t,
                timeout,
            )
        };
        self.check_size(res)
    }

Timeout value is 10s but we can see in our logs that it's waiting forever there.

Has anyone heared about problem specific to Windows that the hid_read_timeout call would hang forever even if a timeout value of 10000 is specified?

Thx a lot for help - we are a bit clueless at this point.

We have an application that works perfectly on Linux and Mac and most of the time for Windows. But on Windows it happens that the call to `read_timeout` never returns and the entire app is hanging because we are cleanly using mutexes to prevent parallel accessing the USB device. We tracked our problem down to the call of `hid_read_timeout` ```rust fn read_timeout(&self, buf: &mut [u8], timeout: i32) -> HidResult<usize> { let res = unsafe { ffi::hid_read_timeout( self._hid_device, buf.as_mut_ptr(), buf.len() as size_t, timeout, ) }; self.check_size(res) } ``` Timeout value is 10s but we can see in our logs that it's waiting forever there. Has anyone heared about problem specific to Windows that the `hid_read_timeout` call would hang forever even if a timeout value of 10000 is specified? Thx a lot for help - we are a bit clueless at this point.

shufps commented

2023-12-01 01:28:22 -06:00

(Migrated from github.com)