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Joel Sherrill
c3db01d0f3
* libcsupport/include/rtems/libcsupport.h, libcsupport/src/newlibc.c, sapi/Makefile.am, sapi/include/confdefs.h, sapi/src/exinit.c, score/Makefile.am, score/preinstall.am, score/include/rtems/score/userext.h, score/src/chain.c, score/src/userext.c: Switch to newlib reentrancy extension being installed in the initial set instead of using rtems_extension_create. While implementing this, noticed that user extensions and chain code had multiple functions in a single file which is not desirable in the SuperCore and API portions of RTEMS, so split these into multiple files with one function per file. Also noticed that some of user extension code was inlined for no particular reason so moved that to C bodies. Split executive shutdown from initialization since not every application shuts down. Moved __fini call to executive shutdown to be more symmetrical with where it is called at startup. * sapi/src/exshutdown.c, score/src/chainappend.c, score/src/chainextract.c, score/src/chainget.c, score/src/chaininsert.c, score/src/userextaddapiset.c, score/src/userextaddset.c, score/src/userextremoveset.c, score/src/userextthreadbegin.c, score/src/userextthreadcreate.c, score/src/userextthreaddelete.c, score/src/userextthreadrestart.c, score/src/userextthreadstart.c, score/src/userextthreadswitch.c: New files. * score/inline/rtems/score/userext.inl: Removed.
--
-- $Id$
--
Overview of newlib support (newlib is from CYGNUS)
Each task can have its own libc state including:
open stdio files
strtok
multi precision arithmetic state
etc.
This is implemented by a reentrancy data structure for each task.
When a task is "started" (in RTEMS sense) the reentrancy structure
is allocated. Its address is stored in notepad[NOTEPAD_LAST].
When task is switched to, the value of global variable _impure_ptr
is changed to the value of the new tasks reentrancy structure.
When a task is deleted
atexit() processing (for that task) happens
task's stdio buffers are flushed
When exit(3) is called
calling task's atexit processing done
global libc state atexit processing done
(this will include any atexit routines installed by drivers)
executive is shutdown
causes a context switch back to bsp land
NOTE:
libc extension are installed by bsp_libc_init()
iff we are using clock interrupts.
This hack is necessary to allow the tmtests to avoid
timing the extensions.