diff options
Diffstat (limited to 'nuttx/include/limits.h')
| -rw-r--r-- | nuttx/include/limits.h | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/nuttx/include/limits.h b/nuttx/include/limits.h index 285eea684..d32c7177a 100644 --- a/nuttx/include/limits.h +++ b/nuttx/include/limits.h @@ -114,11 +114,27 @@ #define _POSIX_RTSIG_MAX 31 #define _POSIX_SIGQUEUE_MAX 32 -/* Required for POSIX timers */ +/* Required for POSIX timers. + * + * _POSIX_DELAYTIMER_MAX is the number of timer expiration overruns. + * + * _POSIX_TIMER_MAX is the per-process number of timers. + * + * _POSIX_CLOCKRES_MIN is the resolution of the CLOCK_REALTIME clock in nanoseconds. + * CLOCK_REALTIME is controlled by the NuttX system time. The default value is the + * system timer which has a resolution of 10 milliseconds. This default setting can + * be overridden by defining the clock interval in milliseconds as CONFIG_MSEC_PER_TICK + * in the board configuration file. + */ #define _POSIX_DELAYTIMER_MAX 32 #define _POSIX_TIMER_MAX 32 -#define _POSIX_CLOCKRES_MIN 10000000 + +#ifdef CONFIG_MSEC_PER_TICK +# define _POSIX_CLOCKRES_MIN ((CONFIG_MSEC_PER_TICK)*1000000) +#else +# define _POSIX_CLOCKRES_MIN (10*1000000) +#endif /* Required for asynchronous I/O */ |