Minimal test program for clock(3)
Change-Id: I4fcf6e3c6ed55f1db96dc93e6809b35d7719d32f
diff --git a/tests/bionic/libc/Android.mk b/tests/bionic/libc/Android.mk
index a099990..6027945 100644
--- a/tests/bionic/libc/Android.mk
+++ b/tests/bionic/libc/Android.mk
@@ -61,6 +61,7 @@
# First, the tests in 'common'
sources := \
+ common/test_clock.c \
common/test_cpu_set.c \
common/test_drand48.c \
common/test_executable_destructor.c \
diff --git a/tests/bionic/libc/common/test_clock.c b/tests/bionic/libc/common/test_clock.c
new file mode 100644
index 0000000..6d3752e
--- /dev/null
+++ b/tests/bionic/libc/common/test_clock.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Minimal test program for clock
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+// this thread soaks the CPU so that clock() function will advance
+void *cpu_hog(void *arg)
+{
+ for (;;) {
+ // the system call should not be optimized away by the compiler
+ (void) getpid();
+ }
+}
+
+int main(int argc, char **argv)
+{
+ pthread_t thread;
+ clock_t ticks10, ticks15;
+
+ // do not call clock() here so we can test initialization
+
+ // soak the CPU for 10 seconds, then read clock
+ pthread_create(&thread, NULL, cpu_hog, NULL);
+ sleep(10);
+ ticks10 = clock();
+
+ // soak the CPU for 5 more seconds, then read clock
+ sleep(5);
+ ticks15 = clock();
+
+ // print the results
+ printf("CLOCKS_PER_SEC = %ld ticks/sec\n", (clock_t) CLOCKS_PER_SEC);
+ printf("At 10 secs clock=%lu, at 15 secs clock=%lu\n", ticks10, ticks15);
+
+ // exit could wait for the other thread to complete
+ _exit(EXIT_SUCCESS);
+}