Environment Configuration

 

While some configuration properties are attached to threads -- such as the thread's weight and original ports -- most configuration properities are attched to global environments. For example, the current input port is a property of a global environment, not of a thread.

Envionrment-based configuration information is stored in a  Scheme_Config record. For any environment,  scheme_env_config returns the record for the environment. Primitive procedures access the current configuration through the current environment ( scheme_current_env).

•  enable_break --   This flag enables break-checking.
•  stdin_port,  stdout_port, and  stderr_port --   These are the current input and output ports. The values for the current thread's environment (not the current environment!) are available as  scheme_stdin_port,  scheme_stdout_port, and  scheme_stderr_port.
•  can_read_graph -- Stores the state of  read-accept-graph.
•  can_read_box -- Stores the state of  read-accept-box.
•  can_read_compiled -- Stores the state of  read-accept-compiled.
•  can_read_type_symbol -- Stores the state of  read-accept-type-symbol.
•  print_graph -- Stores the state of  print-graph.
•  print_box -- Stores the state of  print-box.
•  print_struct -- Stores the state of  print-struct.
•  error_print_width -- Stores the state of  error-print-width.