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2 Commits

Author SHA1 Message Date
Peter A. Bigot
137ea74052 sys/sem.h: fix path to atomic.h 
Use of old location produces a compiler warning.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
 2019-07-26 06:37:59 +03:00
Wentong Wu
715369350d lib: os: add sys_sem data type 
For systems with userspace, the sys_sem exist in user memory working
as counter semaphore for user mode thread. The implemention of sys_sem
is based on k_futex. And the majority of the synchronization operations
are performed in user mode to reduce the calling of system call.
And for systems without userspace enabled, sys_sem behaves like k_sem.

Fixes: #15139.

Signed-off-by: Wentong Wu <wentong.wu@intel.com>
 2019-07-24 10:12:25 -07:00