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kernel: remove K_TIMING thread flag

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The fact that a thread is timing out was tracked via two flags: the
K_TIMING thread flag bit, and the thread's timeout's
delta_ticks_from_prev being -1 or not. This duplication could
potentially cause discrepancies if the two flags got out-of-sync, and
there was no benfits to having both.

Since timeouts that are not parts of a thread rely on the value of
delta_ticks_from_prev, standardize on it.

Since the K_TIMING bit is removed from the thread's flags, K_READY would
not reflect the reality anymore. It is removed and replaced by
_is_thread_prevented_froM_running(), which looks at the state flags that
are relevant. A thread that is ready now is not prevented from running
and does not have an active timeout.

Change-Id: I902ef9fb7801b00626df491f5108971817750daa
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2016-11-23 22:15:44 -05:00 • committed by Anas Nashif
commit a36e0cf651
8 changed files with 63 additions and 64 deletions
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8
kernel/unified/include/kernel_structs.h
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@ -33,11 +33,6 @@
/* thread is defined statically */
#define K_STATIC (1 << 8)
#define K_READY 0
/* Thread is waiting on a timeout */
#define K_TIMING (1 << 12)
/* Thread is waiting on an object */
#define K_PENDING (1 << 13)
@ -53,9 +48,6 @@
/* Not a real thread */
#define K_DUMMY (1 << 17)
#define K_EXECUTION_MASK \
(K_TIMING | K_PENDING | K_PRESTART | K_DEAD | K_SUSPENDED | K_DUMMY)
#if defined(CONFIG_FP_SHARING)
/* thread uses floating point registers */
#define K_FP_REGS (1 << 4)