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kernel: add per-thread errno support

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Saves an errno per-thread, retrieved via _get_errno(), instead of
changing the value of a global variable during context switches to avoid
a hit to the context switch performance.

Per-arch asm implementations are provided for maximum performance.

Enabled by default, but can be disabled via the CONFIG_ERRNO option.

Change-Id: I81d57a2e318c94c68eee913ae0d4ca3a3609c7a4
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2015-12-04 15:12:03 -05:00 • committed by Anas Nashif
commit 3181df6db4
11 changed files with 143 additions and 1 deletions
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3
arch/arc/include/nano_private.h
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@ -180,6 +180,9 @@ struct tcs {
#ifdef CONFIG_NANO_TIMEOUTS
struct _nano_timeout nano_timeout;
#endif
#ifdef CONFIG_ERRNO
int errno_var;
#endif
};
struct s_NANO {