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 fields:

• error_buf -- This is the mz_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.
• config -- The thread's current parameterization. See also section 3.8.
• engine_weight -- The weight of the thread.
• next -- The next thread in the linked list of threads; this is NULL for the main thread.
• error_escape_proc -- The current error escape handler for this 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.

• Threads in Embedded MzScheme with Event Loops
  • Callbacks for Blocked Threads
• Sleeping by Embedded MzScheme
• Blocking the Current Thread
• Integration with Threads
• Library Functions