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https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
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047f4a3f75
Unlike the C version, this allows for any arbitrary type of return value. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1377>
37 lines
1 KiB
Rust
37 lines
1 KiB
Rust
// Take a look at the license at the top of the repository in the LICENSE file.
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type GstMainFuncSimple = Option<unsafe extern "C" fn(glib::ffi::gpointer)>;
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#[link(name = "gstreamer-1.0")]
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extern "C" {
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#[cfg(feature = "v1_22")]
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fn gst_macos_main_simple(func: GstMainFuncSimple, user_data: glib::ffi::gpointer);
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}
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#[cfg(feature = "v1_22")]
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#[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
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#[doc(alias = "gst_macos_main")]
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pub fn macos_main<T, F>(func: F) -> T
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where
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F: FnOnce() -> T + Send,
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{
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skip_assert_initialized!();
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unsafe extern "C" fn trampoline<T, F: FnOnce() -> T + Send>(user_data: glib::ffi::gpointer) {
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let data = &mut *(user_data as *mut (Option<F>, Option<T>));
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let func = data.0.take().unwrap();
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let res = func();
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data.1 = Some(res);
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}
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let mut func: (Option<F>, Option<T>) = (Some(func), None);
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unsafe {
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gst_macos_main_simple(
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Some(trampoline::<T, F>),
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&mut func as *mut (Option<F>, Option<T>) as *mut _,
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);
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}
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func.1.unwrap()
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}
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