... and for reading the contents of the hostrt data.
Signed-off-by: Wolfgang Mauerer <wolfgang.maue...@siemens.com>
---
examples/posix/Makefile | 3 +-
examples/posix/show_hrtime.c | 82 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 84 insertions(+), 1 deletions(-)
create mode 100644 examples/posix/show_hrtime.c
diff --git a/examples/posix/Makefile b/examples/posix/Makefile
index 1bf46a4..c5ec8cb 100644
--- a/examples/posix/Makefile
+++ b/examples/posix/Makefile
@@ -1,7 +1,7 @@
###### CONFIGURATION ######
### List of applications to be build
-APPLICATIONS = satch
+APPLICATIONS = satch show_hrtime
### Note: to override the search path for the xeno-config script, use "make
XENO=..."
@@ -14,6 +14,7 @@ MODULES = satch
all::
satch: satch.c
+show_hrtime: show_hrtime.c
###### USER SPACE BUILD (no change required normally) ######
diff --git a/examples/posix/show_hrtime.c b/examples/posix/show_hrtime.c
new file mode 100644
index 0000000..932c9f8
--- /dev/null
+++ b/examples/posix/show_hrtime.c
@@ -0,0 +1,82 @@
+/*
+ * Dump CLOCK_HOST_REALTIME data in the vdso page
+ * Written by Wolfgang Mauerer <wolfgang.maue...@siemens.com>
+ */
+
+#include <stdio.h>
+#include <sys/mman.h>
+#include <nucleus/vdso.h>
+#include <nucleus/types.h>
+#include <nucleus/seqlock_user.h>
+#include <native/task.h>
+
+extern unsigned long xeno_sem_heap[2];
+static unsigned modeswitches = 0;
+
+void count_modeswitches(int sig __attribute__((unused)))
+{
+ modeswitches++;
+}
+
+int main(int argc, char **argv)
+{
+ int res;
+ struct timespec ts1, ts2;
+
+ mlockall(MCL_CURRENT|MCL_FUTURE);
+
+ if (!xeno_sem_heap[1]) {
+ fprintf(stderr, "Could not determine position of the "
+ "global semaphore heap\n");
+ return 1;
+ }
+
+ if (!xnvdso_test_feature(XNVDSO_FEAT_HOST_REALTIME)) {
+ printf("XNVDSO_FEAT_HOST_REALTIME not available\n");
+ return 1;
+ }
+
+ if (nkvdso->hostrt_data.live)
+ printf("hostrt data area is live\n");
+ else {
+ printf("hostrt data area is not live\n");
+ return 2;
+ }
+
+ printf("Sequence counter : %u\n",
+ nkvdso->hostrt_data.seqcount.sequence);
+ printf("wall_time_sec : %ld\n", nkvdso->hostrt_data.wall_time_sec);
+ printf("wall_time_nsec : %u\n", nkvdso->hostrt_data.wall_time_nsec);
+ printf("wall_to_monotonic\n");
+ printf(" tv_sec : %jd\n",
+ (intmax_t)nkvdso->hostrt_data.wall_to_monotonic.tv_sec);
+ printf(" tv_nsec : %ld\n",
+ nkvdso->hostrt_data.wall_to_monotonic.tv_nsec);
+ printf("cycle_last : %lu\n", nkvdso->hostrt_data.cycle_last);
+ printf("mask : 0x%lx\n", nkvdso->hostrt_data.mask);
+ printf("mult : %u\n", nkvdso->hostrt_data.mult);
+ printf("shift : %u\n\n", nkvdso->hostrt_data.shift);
+
+ res = clock_gettime(CLOCK_REALTIME, &ts1);
+ if (res)
+ printf("clock_gettime(CLOCK_REALTIME) failed!\n");
+
+ signal(SIGXCPU, count_modeswitches);
+ rt_task_set_mode(0, T_WARNSW, NULL);
+ modeswitches = 0;
+ res = clock_gettime(CLOCK_HOST_REALTIME, &ts2);
+ if (res)
+ printf("clock_gettime(CLOCK_HOST_REALTIME) failed!\n");
+
+ if (modeswitches == 1) {
+ printf("CLOCK_HOST_REALTIME caused a mode switch.\n");
+ return 3;
+ }
+
+ rt_task_set_mode(T_PRIMARY, 0, NULL);
+ printf("CLOCK_REALTIME : tv_sec = %jd, tv_nsec = %ld\n",
+ ts1.tv_sec, ts1.tv_nsec);
+ printf("CLOCK_HOST_REALTIME: tv_sec = %jd, tv_nsec = %ld\n",
+ ts2.tv_sec, ts2.tv_nsec);
+ return 0;
+}
--
1.6.4
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