isolate.swift

// allocate create isolate arguments
let isolate = UnsafeMutablePointer<OpaquePointer?>
  .allocate(capacity: 1)
let params = UnsafeMutablePointer<graal_create_isolate_params_t>
  .allocate(capacity: 1)
let graal_thread = UnsafeMutablePointer<OpaquePointer?>
  .allocate(capacity: 1)
// create isolate
let ret = graal_create_isolate(self.params, self.isolate, graal_thread)
if ret != 0 {
    print("error creating isolate")
    exit(0)
}
// native call into Java
Java_exposed_c_function_by_graal(graal_thread.pointee)
Java_exposed_c_function_by_graal_with_args(graal_thread.pointee, arg1, arg2)
// destroy isolate
let ret2 = graal_tear_down_isolate(graal_thread.pointee)
if ret2 != 0 {
    print("error tearing down isolate")
    exit(0)
}
// deallocate
params.deallocate()
isolate.deallocate()
graal_thread.deallocate()