registerGlobalTracerProvider function
Implementation
void registerGlobalTracerProvider(api.TracerProvider tracerProvider) {
if (_tracerProvider != _noopTracerProvider) {
throw StateError('A global TracerProvider has already been created. '
'registerGlobalTracerProvider must be called only once before any '
'calls to the getter globalTracerProvider.');
}
_tracerProvider = tracerProvider;
}