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| author | Aun-Ali Zaidi <admin@kodeit.net> | 2015-12-23 14:44:02 -0600 |
|---|---|---|
| committer | Joel Sherrill <joel.sherrill@oarcorp.com> | 2015-12-24 16:52:34 -0600 |
| commit | d5154d0f6a04f3b7ed59d9a09038576fe2640756 (patch) | |
| tree | 4b6dcf6e9b116223903afbc1b1141d28fb751848 /cpukit/sapi/include/rtems/extension.h | |
| parent | score: Fix watchdog removal (diff) | |
| download | rtems-d5154d0f6a04f3b7ed59d9a09038576fe2640756.tar.bz2 | |
api: Remove deprecated Notepads
Notepads where a feature of RTEMS' tasks that simply functioned in
the same way as POSIX keys or threaded local storage (TLS). They were
introduced well before per task variables, which are also deprecated,
and were barely used in favor of their POSIX alternatives.
In addition to their scarce usage, Notepads took up unnecessary memory.
For each task:
- 16 32-bit integers were allocated.
- A total of 64 bytes per task per thread.
This is especially critical in low memory and safety-critical applications.
They are also defined as uint32_t, and therefore are not guaranteed to
hold a pointer.
Lastly, they are not portable solutions for SMP and uniprocessor systems,
like POSIX keys and TLS.
updates #2493.
Diffstat (limited to 'cpukit/sapi/include/rtems/extension.h')
| -rw-r--r-- | cpukit/sapi/include/rtems/extension.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/cpukit/sapi/include/rtems/extension.h b/cpukit/sapi/include/rtems/extension.h index d3b0aa3c5a..2a877ceee9 100644 --- a/cpukit/sapi/include/rtems/extension.h +++ b/cpukit/sapi/include/rtems/extension.h @@ -88,9 +88,7 @@ typedef User_extensions_routine * set to be linked to each task's control block (TCB). This area is only * available for the dynamic extensions. This set of pointers is an extension * of the TCB and can be used to store additional data required by the user's - * extension functions. It is also possible for a user extension to utilize the - * notepad locations associated with each task although this may conflict with - * application usage of those particular notepads. + * extension functions. * * The TCB extension is an array of pointers in the TCB. The index into the * table can be obtained from the extension identifier returned when the |