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https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
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49 lines
1.4 KiB
Rust
49 lines
1.4 KiB
Rust
// Copyright (C) 2017 Author: Arun Raghavan <arun@arunraghavan.net>
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use futures::sync::oneshot;
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use futures::Future;
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use std::sync::Mutex;
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use tokio::runtime;
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pub fn wait<F, T>(
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canceller: &Mutex<Option<oneshot::Sender<T>>>,
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runtime: &runtime::Runtime,
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future: F,
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) -> Result<F::Item, Option<gst::ErrorMessage>>
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where
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F: Send + Future<Error = gst::ErrorMessage> + 'static,
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F::Item: Send,
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{
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let mut canceller_guard = canceller.lock().unwrap();
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let (sender, receiver) = oneshot::channel::<T>();
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canceller_guard.replace(sender);
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drop(canceller_guard);
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let unlock_error = gst_error_msg!(gst::ResourceError::Busy, ["unlock"]);
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let res = oneshot::spawn(future, &runtime.executor())
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.select(receiver.then(|_| Err(unlock_error.clone())))
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.wait()
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.map(|v| v.0)
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.map_err(|err| {
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if err.0 == unlock_error {
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None
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} else {
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Some(err.0)
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}
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});
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/* Clear out the canceller */
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canceller_guard = canceller.lock().unwrap();
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*canceller_guard = None;
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res
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}
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