Test needed for timer_create with CLOCK_MONOTONC

the timer_create() method can use CLOCK_MONOTONIC
but there was  no test for this.
Also it implements the functionality to
create a CLOCK_MONOTONIC timer and gettime() .
Closes #3888

2 files changed, 32 insertions, 19 deletions

diff --git a/cpukit/posix/src/psxtimercreate.c b/cpukit/posix/src/psxtimercreate.c
index a63cf1d100..2b5a10140f 100644
--- a/cpukit/posix/src/psxtimercreate.c
+++ b/cpukit/posix/src/psxtimercreate.c
@@ -40,7 +40,7 @@ int timer_create(
 {
   POSIX_Timer_Control *ptimer;
 
-  if ( clock_id != CLOCK_REALTIME )
+  if (  clock_id != CLOCK_REALTIME && clock_id != CLOCK_MONOTONIC )
     rtems_set_errno_and_return_minus_one( EINVAL );
 
   if ( !timerid )
@@ -91,6 +91,7 @@ int timer_create(
   ptimer->timer_data.it_value.tv_nsec    = 0;
   ptimer->timer_data.it_interval.tv_sec  = 0;
   ptimer->timer_data.it_interval.tv_nsec = 0;
+  ptimer->clock_type = clock_id;
 
   _Watchdog_Preinitialize( &ptimer->Timer, _Per_CPU_Get_snapshot() );
   _Watchdog_Initialize( &ptimer->Timer, _POSIX_Timer_TSR );
diff --git a/cpukit/posix/src/timergettime.c b/cpukit/posix/src/timergettime.c
index ee2a566f0e..f4b259678c 100644
--- a/cpukit/posix/src/timergettime.c
+++ b/cpukit/posix/src/timergettime.c
@@ -28,6 +28,7 @@
 #include <rtems/score/todimpl.h>
 #include <rtems/score/watchdogimpl.h>
 #include <rtems/seterr.h>
+#include <rtems/timespec.h>
 
 /*
  *          - When a timer is initialized, the value of the time in
@@ -42,32 +43,43 @@ int timer_gettime(
 )
 {
   POSIX_Timer_Control *ptimer;
-  ISR_lock_Context     lock_context;
-  uint64_t             now;
-  uint32_t             remaining;
+  ISR_lock_Context lock_context;
+  Per_CPU_Control *cpu;
+  struct timespec now;
+  struct timespec expire;
+  struct timespec result;
 
   if ( !value )
     rtems_set_errno_and_return_minus_one( EINVAL );
 
   ptimer = _POSIX_Timer_Get( timerid, &lock_context );
-  if ( ptimer != NULL ) {
-    Per_CPU_Control *cpu;
+  if ( ptimer == NULL ) {
+    rtems_set_errno_and_return_minus_one( EINVAL );
+  }
 
-    cpu = _POSIX_Timer_Acquire_critical( ptimer, &lock_context );
-    now = cpu->Watchdog.ticks;
+  cpu = _POSIX_Timer_Acquire_critical( ptimer, &lock_context );
+  rtems_timespec_from_ticks( ptimer->Timer.expire, &expire );
 
-    if ( now < ptimer->Timer.expire ) {
-      remaining = (uint32_t) ( ptimer->Timer.expire - now );
-    } else {
-      remaining = 0;
-    }
+  if ( ptimer->clock_type == CLOCK_MONOTONIC ) {
+  _Timecounter_Nanouptime(&now);
+  } else  if (ptimer->clock_type == CLOCK_REALTIME) {
+    _TOD_Get(&now);
+  } else {
+    _POSIX_Timer_Release( cpu, &lock_context );
+    rtems_set_errno_and_return_minus_one( EINVAL );
+  }
 
-    _Timespec_From_ticks( remaining, &value->it_value );
-    value->it_interval = ptimer->timer_data.it_interval;
 
-    _POSIX_Timer_Release( cpu, &lock_context );
-    return 0;
+ if ( rtems_timespec_less_than( &now, &expire ) ) {
+      rtems_timespec_subtract( &now, &expire, &result );
+  } else {
+    result.tv_nsec = 0;
+    result.tv_sec  = 0;
   }
 
-  rtems_set_errno_and_return_minus_one( EINVAL );
-}
+  value->it_value = result;
+  value->it_interval = ptimer->timer_data.it_interval;
+
+  _POSIX_Timer_Release( cpu, &lock_context );
+  return 0;
+}
\ No newline at end of file