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Diffstat (limited to 'c/src/exec/libcsupport/src/README')
| -rw-r--r-- | c/src/exec/libcsupport/src/README | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/c/src/exec/libcsupport/src/README b/c/src/exec/libcsupport/src/README deleted file mode 100644 index ee7a90501e..0000000000 --- a/c/src/exec/libcsupport/src/README +++ /dev/null @@ -1,37 +0,0 @@ --- --- $Id$ --- - -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. - |