1 files changed, 141 insertions, 0 deletions
diff --git a/tests/benchtest5.c b/tests/benchtest5.c
new file mode 100644
index 0000000..0bdaf90
--- /dev/null
+++ b/tests/benchtest5.c
@@ -0,0 +1,141 @@
+/*
+ * benchtest5.c
+ *
+ * Measure time taken to complete an elementary operation.
+ *
+ * - Semaphore
+ *   Single thread iteration over post/wait for a semaphore.
+ */
+
+#include "test.h"
+#include <sys/timeb.h>
+
+#ifdef __GNUC__
+#include <stdlib.h>
+#endif
+
+#include "benchtest.h"
+
+#define ITERATIONS      10000000L
+
+sem_t sema;
+
+struct _timeb currSysTimeStart;
+struct _timeb currSysTimeStop;
+long durationMilliSecs;
+long overHeadMilliSecs = 0;
+
+#define GetDurationMilliSecs(_TStart, _TStop) ((_TStop.time*1000+_TStop.millitm) \
+                                               - (_TStart.time*1000+_TStart.millitm))
+
+/*
+ * Dummy use of j, otherwise the loop may be removed by the optimiser
+ * when doing the overhead timing with an empty loop.
+ */
+#define TESTSTART \
+  { int i, j = 0, k = 0; _ftime(&currSysTimeStart); for (i = 0; i < ITERATIONS; i++) { j++;
+
+#define TESTSTOP \
+  }; _ftime(&currSysTimeStop); if (j + k == i) j++; }
+
+
+void
+reportTest (char * testNameString)
+{
+  durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs;
+
+  printf( "%-40s %15ld %15.3f\n",
+	    testNameString,
+          durationMilliSecs,
+          (float) durationMilliSecs * 1E3 / ITERATIONS);
+}
+
+
+int
+main (int argc, char *argv[])
+{
+  printf( "========================================================================\n");
+  printf( "\nOperations on a semaphore.\n%ld iterations\n\n",
+          ITERATIONS);
+  printf( "%-40s %15s %15s\n",
+	    "Test",
+	    "Total(msec)",
+	    "average(usec)");
+  printf( "------------------------------------------------------------------------\n");
+
+  /*
+   * Time the loop overhead so we can subtract it from the actual test times.
+   */
+
+  TESTSTART
+  assert(1 == 1);
+  TESTSTOP
+
+  durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs;
+  overHeadMilliSecs = durationMilliSecs;
+
+
+  /*
+   * Now we can start the actual tests
+   */
+  assert(sem_init(&sema, 0, 0) == 0);
+  TESTSTART
+  assert(sem_post(&sema) == 0);
+  TESTSTOP
+  assert(sem_destroy(&sema) == 0);
+
+  reportTest("Post");
+
+
+  assert(sem_init(&sema, 0, ITERATIONS) == 0);
+  TESTSTART
+  assert(sem_wait(&sema) == 0);
+  TESTSTOP
+  assert(sem_destroy(&sema) == 0);
+
+  reportTest("Wait without blocking");
+
+
+  /*
+   * Time the loop overhead so we can subtract it from the actual test times.
+   */
+
+  TESTSTART
+  assert(1 == 1);
+  assert(1 == 1);
+  TESTSTOP
+
+  durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs;
+  overHeadMilliSecs = durationMilliSecs;
+
+
+  /*
+   * Now we can start the actual tests
+   */
+  assert(sem_init(&sema, 0, 0) == 0);
+  TESTSTART
+  assert(sem_post(&sema) == 0);
+  assert(sem_wait(&sema) == 0);
+  TESTSTOP
+  assert(sem_destroy(&sema) == 0);
+
+  reportTest("Post then Wait without blocking");
+
+
+  assert(sem_init(&sema, 0, 1) == 0);
+  TESTSTART
+  assert(sem_wait(&sema) == 0);
+  assert(sem_post(&sema) == 0);
+  TESTSTOP
+  assert(sem_destroy(&sema) == 0);
+
+  reportTest("Wait then Post without blocking");
+
+  printf( "========================================================================\n");
+
+  /*
+   * End of tests.
+   */
+
+  return 0;
+}