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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/libcsupport | |
| 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/libcsupport')
| -rw-r--r-- | cpukit/libcsupport/src/README | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/cpukit/libcsupport/src/README b/cpukit/libcsupport/src/README index 7a9383c524..43fe818b18 100644 --- a/cpukit/libcsupport/src/README +++ b/cpukit/libcsupport/src/README @@ -10,7 +10,7 @@ Overview of newlib support (newlib is from CYGNUS) 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]. + is allocated. When task is switched to, the value of global variable _impure_ptr is changed to the value of the new tasks reentrancy structure. |