Threads

 

  The intializer function  scheme_basic_env creates the main Scheme thread; all other threads are created through calls to  scheme_thread.

Information about each internal MzScheme thread is kept in a  Scheme_Process structure. A pointer to the current thread's structure is available as  scheme_current_process. A  Scheme_Process structure includes the following items:

•  error_buf --   This is the  jmp_buf value used to escape from errors. The error_buf value of the current thread is available as  scheme_error_buf.
•  jumping_to_continuation --   This flag distinguishes escaping-continuation invocations from error escapes. The jumping_to_continuation value of the current thread is available as  scheme_jumping_to_continuation.
•  env --   This is the global environment for the thread. The env value of the current thread is available as  scheme_env.
•  config --   This is a shortcut to env's configuration record (see below).
•  in_port,  out_port, and  err_port --   These are the thread's original input and output ports.
•  write_port,  read_port, and  readerr_port -- The are pipes into/out of the thread's original input and output ports. These values are NULL for the main thread.
•  engine_weight --   The weight of the thread.
•  exn_handler --   The current exception handler for this thread.
•  next -- The next thread in the linked list of threads; this is NULL for the main thread.

The list of all threads is kept in a linked list;  scheme_first_process points to the first thread in the list. The last thread in the list is always the main thread.

• Environment Configuration
• Threads in Embedded MzScheme
  • Blocked Non-main Threads
• Sleeping by Embedded MzScheme
• Integration with Threads
• Library Functions