score: Introduce new monotonic clock

Rename PER_CPU_WATCHDOG_MONOTONIC to PER_CPU_WATCHDOG_TICKS.  Add new
PER_CPU_WATCHDOG_MONOTONIC which is based on the system uptime (measured
by timecounter).

Close #3264.

1 files changed, 13 insertions, 5 deletions

diff --git a/cpukit/include/rtems/score/percpu.h b/cpukit/include/rtems/score/percpu.h
index 00528b5ce3..7d0a6c06bf 100644
--- a/cpukit/include/rtems/score/percpu.h
+++ b/cpukit/include/rtems/score/percpu.h
@@ -248,14 +248,13 @@ typedef struct {
  */
 typedef enum {
   /**
-   * @brief Index for monotonic clock per-CPU watchdog header.
+   * @brief Index for tick clock per-CPU watchdog header.
    *
-   * The reference time point for the monotonic clock is the system start.  The
+   * The reference time point for the tick clock is the system start.  The
    * clock resolution is one system clock tick.  It is used for the system
-   * clock tick based time services and the POSIX services using
-   * CLOCK_MONOTONIC.
+   * clock tick based time services.
    */
-  PER_CPU_WATCHDOG_MONOTONIC,
+  PER_CPU_WATCHDOG_TICKS,
 
   /**
    * @brief Index for realtime clock per-CPU watchdog header.
@@ -267,6 +266,15 @@ typedef enum {
   PER_CPU_WATCHDOG_REALTIME,
 
   /**
+   * @brief Index for monotonic clock per-CPU watchdog header.
+   *
+   * The reference time point for the monotonic clock is the system start.  The
+   * clock resolution is one nanosecond.  It is used for the POSIX services
+   * using CLOCK_MONOTONIC.
+   */
+  PER_CPU_WATCHDOG_MONOTONIC,
+
+  /**
    * @brief Count of per-CPU watchdog headers.
    */
   PER_CPU_WATCHDOG_COUNT