add sporadic_task_ns() helper

Allows for higher-precision setup of real-time tasks.

2 files changed, 14 insertions, 3 deletions

diff --git a/include/litmus.h b/include/litmus.h
index c578009..22376a4 100644
--- a/include/litmus.h
+++ b/include/litmus.h
@@ -18,10 +18,14 @@ int set_rt_task_param(pid_t pid, struct rt_task* param);
 int get_rt_task_param(pid_t pid, struct rt_task* param);
 
 /* setup helper */
-/* times are givin in ms */
+/* times are given in ms */
 int sporadic_task(lt_t e, lt_t p, lt_t phase,
                   int partition, task_class_t cls, int set_cpu_set);
 
+/* times are given in ns */
+int sporadic_task_ns(lt_t e, lt_t p, lt_t phase,
+                     int cpu, task_class_t cls, int set_cpu_set);
+
 #define sporadic_global(e, p) \
         sporadic_task(e, p, 0, 0, RT_CLASS_SOFT, 0)
 #define sporadic_partitioned(e, p, cpu) \
diff --git a/src/litmus.c b/src/litmus.c
index 8f03f4c..5f98b97 100644
--- a/src/litmus.c
+++ b/src/litmus.c
@@ -44,10 +44,17 @@ int be_migrate_to(int target_cpu)
 int sporadic_task(lt_t e, lt_t p, lt_t phase,
                   int cpu, task_class_t cls, int set_cpu_set)
 {
+        return sporadic_task_ns(e * NS_PER_MS, p * NS_PER_MS, phase * NS_PER_MS,
+                                cpu, cls, set_cpu_set);
+}
+
+int sporadic_task_ns(lt_t e, lt_t p, lt_t phase,
+                     int cpu, task_class_t cls, int set_cpu_set)
+{
         struct rt_task param;
         int ret;
-        param.exec_cost = e * NS_PER_MS;
-        param.period    = p * NS_PER_MS;
+        param.exec_cost = e;
+        param.period    = p;
         param.cpu       = cpu;
         param.cls       = cls;
         param.phase     = phase;