static CFProxy[] ExecutePacCFRunLoopSourceBlocking(CreatePACCFRunLoopSource factory, out NSError outError)
{
var runLoop = CFRunLoop.Current;
outError = null;
// build a struct that will have all the needed info for the callback
var pacCbData = new PACProxyCallbackData();
pacCbData.CFRunLoopPtr = runLoop.Handle;
var pacDataPtr = Marshal.AllocHGlobal(Marshal.SizeOf(pacCbData));
try {
Marshal.StructureToPtr(pacCbData, pacDataPtr, false);
var clientContext = new CFStreamClientContext();
clientContext.Info = pacDataPtr;
using (var loopSource = new CFRunLoopSource(factory(ExecutePacCallback, ref clientContext)))
using (var mode = new NSString("Xamarin.iOS.Proxy")) {
runLoop.AddSource(loopSource, mode);
runLoop.RunInMode(mode, double.MaxValue, false);
runLoop.RemoveSource(loopSource, mode);
}
pacCbData = (PACProxyCallbackData)Marshal.PtrToStructure(pacDataPtr, typeof(PACProxyCallbackData));
// get data from the struct
outError = pacCbData.Error;
return(pacCbData.ProxyList);
} finally {
if (pacCbData.ProxyListPtr != IntPtr.Zero)
{
CFObject.CFRelease(pacCbData.ProxyListPtr);
}
if (pacCbData.ErrorPtr != IntPtr.Zero)
{
NSObject.DangerousRelease(pacCbData.ErrorPtr);
}
Marshal.FreeHGlobal(pacDataPtr);
}
}
static async Task <(CFProxy[] proxies, NSError error)> ExecutePacCFRunLoopSourceAsync(CreatePACCFRunLoopSource factory, CancellationToken cancellationToken)
{
CFProxy[] proxies = null;
NSError outError = null;
if (cancellationToken.IsCancellationRequested)
{
throw new OperationCanceledException("Operation was cancelled.");
}
await Task.Run(() => {
// we need the runloop of THIS thread, so it is important to get it in the correct context
var runLoop = CFRunLoop.Current;
// build a struct that will have all the needed info for the callback
var pacCbData = new PACProxyCallbackData();
pacCbData.CFRunLoopPtr = runLoop.Handle;
var pacDataPtr = Marshal.AllocHGlobal(Marshal.SizeOf(pacCbData));
try {
Marshal.StructureToPtr(pacCbData, pacDataPtr, false);
var clientContext = new CFStreamClientContext();
clientContext.Info = pacDataPtr;
using (var loopSource = new CFRunLoopSource(factory(ExecutePacCallback, ref clientContext)))
using (var mode = new NSString("Xamarin.iOS.Proxy")) {
if (cancellationToken.IsCancellationRequested)
{
throw new OperationCanceledException("Operation was cancelled.");
}
cancellationToken.Register(() => {
//if user cancels, we invalidte the source, stop the runloop and remove the source
loopSource.Invalidate();
runLoop.RemoveSource(loopSource, mode);
runLoop.Stop();
});
runLoop.AddSource(loopSource, mode);
// blocks until stop is called, will be done in the cb set previously
runLoop.RunInMode(mode, double.MaxValue, false);
// does not raise an error if source is not longer present, so no need to worry
runLoop.RemoveSource(loopSource, mode);
}
if (cancellationToken.IsCancellationRequested)
{
throw new OperationCanceledException("Operation was cancelled.");
}
pacCbData = (PACProxyCallbackData)Marshal.PtrToStructure(pacDataPtr, typeof(PACProxyCallbackData));
// get data from the struct
proxies = pacCbData.ProxyList;
outError = pacCbData.Error;
} finally {
// clean resources
if (pacCbData.ProxyListPtr != IntPtr.Zero)
{
CFObject.CFRelease(pacCbData.ProxyListPtr);
}
if (pacCbData.ErrorPtr != IntPtr.Zero)
{
NSObject.DangerousRelease(pacCbData.ErrorPtr);
}
Marshal.FreeHGlobal(pacDataPtr);
}
}, cancellationToken).ConfigureAwait(false);
if (cancellationToken.IsCancellationRequested)
{
throw new OperationCanceledException("Operation was cancelled.");
}
return(proxies : proxies, error : outError);
}
