gstreamer-rs/tutorials/src/tutorials-common.rs

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/// macOS has a specific requirement that there must be a run loop running
/// on the main thread in order to open windows and use OpenGL.
#[cfg(target_os = "macos")]
mod runloop {
use std::os::raw::c_void;
#[repr(C)]
pub struct CFRunLoop(*mut c_void);
#[link(name = "foundation", kind = "framework")]
extern "C" {
fn CFRunLoopRun();
fn CFRunLoopGetMain() -> *mut c_void;
fn CFRunLoopStop(l: *mut c_void);
}
impl CFRunLoop {
pub fn run() {
unsafe {
CFRunLoopRun();
}
}
pub fn get_main() -> CFRunLoop {
unsafe {
let r = CFRunLoopGetMain();
assert!(!r.is_null());
CFRunLoop(r)
}
}
pub fn stop(&self) {
unsafe { CFRunLoopStop(self.0) }
}
}
unsafe impl Send for CFRunLoop {}
}
/// On macOS this launches the callback function on a thread.
/// On other platforms it's just executed immediately.
#[cfg(not(target_os = "macos"))]
pub fn run<T, F: FnOnce() -> T + Send + 'static>(main: F) -> T
where
T: Send + 'static,
{
main()
}
#[cfg(target_os = "macos")]
pub fn run<T, F: FnOnce() -> T + Send + 'static>(main: F) -> T
where
T: Send + 'static,
{
use std::thread;
let l = runloop::CFRunLoop::get_main();
let t = thread::spawn(move || {
let res = main();
l.stop();
res
});
runloop::CFRunLoop::run();
t.join().unwrap()
}