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Add support for newlib dynamic reentrancy (#496)

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Previously, newlib's _impure_ptr was updated on every context switch
to point to the current task's _reent structure.

However, this behavior is no longer valid on multi-core systems due
to the fact that multiple cores can switch contexts at the same time,
thus leading to the corruption of the _impure_ptr.

However, Newlib can be compiled with __DYNAMIC_REENT__ enabled which
will cause newlib functions to call __getreent() instead in order to
obtain the required reent struct.

This commit adds dynamic reentrancy support to FreeRTOS:

- Added a configNEWLIB_REENTRANT_IS_DYNAMIC to enable dynamic reentrancy support
- _impure_ptr is no longer updated with reentrancy is dynamic
- Port must provide their own __getreent() that returns the current task's reent struct
This commit is contained in:
Darian 2022-06-01 07:11:02 +08:00 • committed by GitHub
parent a97741a08d
commit 34b8e24d7c
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2 changed files with 20 additions and 6 deletions
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8
include/FreeRTOS.h
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@ -72,6 +72,14 @@
#include <reent.h>
#endif
#ifdef configNEWLIB_REENTRANT_IS_DYNAMIC
#if ( configUSE_NEWLIB_REENTRANT != 1 )
#error configUSE_NEWLIB_REENTRANT must be defined to 1 to enable configNEWLIB_REENTRANT_IS_DYNAMIC
#endif
#else /* configNEWLIB_REENTRANT_IS_DYNAMIC */
#define configNEWLIB_REENTRANT_IS_DYNAMIC 0
#endif /* configNEWLIB_REENTRANT_IS_DYNAMIC */
/*
* Check all the required application specific macros have been defined.
* These macros are application specific and (as downloaded) are defined