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1 30 unneback
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--  $Id: README,v 1.2 2001-09-27 12:01:15 chris Exp $
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Overview of newlib support (newlib is from CYGNUS)
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    Each task can have its own libc state including:
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        open stdio files
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        strtok
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        multi precision arithmetic state
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        etc.
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    This is implemented by a reentrancy data structure for each task.
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    When a task is "started" (in RTEMS sense) the reentrancy structure
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    is allocated.  Its address is stored in notepad[NOTEPAD_LAST].
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    When task is switched to, the value of global variable _impure_ptr
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    is changed to the value of the new tasks reentrancy structure.
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    When a task is deleted
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        atexit() processing (for that task) happens
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        task's stdio buffers are flushed
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    When exit(3) is called
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        calling task's atexit processing done
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        global libc state atexit processing done
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            (this will include any atexit routines installed by drivers)
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        executive is shutdown
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            causes a context switch back to bsp land
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NOTE:
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    libc extension are installed by bsp_libc_init()
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        iff we are using clock interrupts.
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        This hack is necessary to allow the tmtests to avoid
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        timing the extensions.
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