Update glibc revision

tests/clock/clock_test.c

Index: tests/clock/clock_test.c
diff --git a/tests/clock/clock_test.c b/tests/clock/clock_test.c
new file mode 100644
index 0000000000000000000000000000000000000000..63010d6b0e111b3e85edb7f9688d23b8dc413609
--- /dev/null
+++ b/tests/clock/clock_test.c
@@ -0,0 +1,364 @@
+/*
+ * Copyright (c) 2013 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <errno.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "native_client/src/include/nacl_macros.h"
+
+/*
+ * This test resembles the trusted version which can be found in
+ * src/shared/platform/nacl_clock_test.c, but uses the stable ABI
+ * to test the integration correctness. When making changes, please
+ * keep both tests in sync if possible.
+ */
+
+
+#define NANOS_PER_MICRO   (1000)
+#define MICROS_PER_MILLI  (1000)
+#define NANOS_PER_MILLI   (NANOS_PER_MICRO * MICROS_PER_MILLI)
+#define MICROS_PER_UNIT   (1000 * 1000)
+#define NANOS_PER_UNIT    (NANOS_PER_MICRO * MICROS_PER_UNIT)
+
+/*
+ * On an unloaded i7, 1ms with a 1.25 fuzziness factor and a 100,000
+ * ns constant syscall overhead works fine.  On bots, we have to be
+ * much more generous.  (This is especially true for qemu-based
+ * testing.)
+ */
+#define DEFAULT_NANOSLEEP_EXTRA_OVERHEAD  (10 * NANOS_PER_MILLI)
+#define DEFAULT_NANOSLEEP_EXTRA_FACTOR    (100.0)
+#define DEFAULT_NANOSLEEP_TIME            (10 * NANOS_PER_MILLI)
+
+/*
+ * Global testing parameters -- fuzziness coefficients in determining
+ * what is considered accurate.
+ */
+static int      g_cputime = 1;
+static double   g_fuzzy_factor = DEFAULT_NANOSLEEP_EXTRA_FACTOR;
+static uint64_t g_syscall_overhead = DEFAULT_NANOSLEEP_EXTRA_OVERHEAD;
+static uint64_t g_slop_ms = 0;
+
+/*
+ * ClockMonotonicAccuracyTest samples the CLOCK_MONOTONIC
+ * clock before and after invoking NaClNanosleep and computes the time
+ * delta.  The test is considered to pass if the time delta is close
+ * to the requested value.  "Close" is a per-host-OS attribute, thus
+ * the above testing parameters.
+ */
+static int ClockMonotonicAccuracyTest(uint64_t sleep_nanos) {
+  int             num_failures = 0;
+
+  struct timespec t_start;
+  struct timespec t_sleep;
+  struct timespec t_end;
+
+  uint64_t        elapsed_nanos;
+  uint64_t        elapsed_lower_bound;
+  uint64_t        elapsed_upper_bound;
+
+  t_sleep.tv_sec  = sleep_nanos / NANOS_PER_UNIT;
+  t_sleep.tv_nsec = sleep_nanos % NANOS_PER_UNIT;
+
+  printf("\nCLOCK_MONOTONIC accuracy test:\n");
+
+  if (0 != clock_gettime(CLOCK_MONOTONIC, &t_start)) {
+    fprintf(stderr, "clock_test: clock_gettime (start) failed, error %d\n",
+            errno);
+    ++num_failures;
+    goto done;
+  }
+  for (;;) {
+    if (0 == nanosleep(&t_sleep, &t_sleep)) {
+      break;
+    }
+    if (EINTR == errno) {
+      /* interrupted syscall: sleep some more */
+      continue;
+    }
+    fprintf(stderr, "clock_test: nanosleep failed, error %d\n",
+            errno);
+    num_failures++;
+    goto done;
+  }
+  if (0 != clock_gettime(CLOCK_MONOTONIC, &t_end)) {
+    fprintf(stderr, "clock_test: clock_gettime (end) failed, error %d\n",
+            errno);
+    return 1;
+  }
+
+  elapsed_nanos = (t_end.tv_sec - t_start.tv_sec) * NANOS_PER_UNIT +
+      (t_end.tv_nsec - t_start.tv_nsec) + g_slop_ms * NANOS_PER_MILLI;
+
+  elapsed_lower_bound = sleep_nanos;
+  elapsed_upper_bound = (uint64_t) (sleep_nanos * g_fuzzy_factor +
+                                    g_syscall_overhead);
+
+  printf("requested sleep:   %20"PRIu64" nS\n", sleep_nanos);
+  printf("elapsed sleep:     %20"PRIu64" nS\n", elapsed_nanos);
+  printf("sleep lower bound: %20"PRIu64" nS\n", elapsed_lower_bound);
+  printf("sleep upper bound: %20"PRIu64" nS\n", elapsed_upper_bound);
+
+  if (elapsed_nanos < elapsed_lower_bound ||
+      elapsed_upper_bound < elapsed_nanos) {
+    printf("discrepancy too large\n");
+    num_failures++;
+  }
+ done:
+  printf((0 == num_failures) ? "PASSED\n" : "FAILED\n");
+  return num_failures;
+}
+
+/*
+ * ClockRealtimeAccuracyTest compares the time returned by
+ * CLOCK_REALTIME against that returned by gettimeofday.
+ */
+static int ClockRealtimeAccuracyTest(void) {
+  int             num_failures = 0;
+
+  struct timespec t_now_ts;
+  struct timeval  t_now_tv;
+
+  uint64_t        t_now_ts_nanos;
+  uint64_t        t_now_tv_nanos;
+  int64_t         t_now_diff_nanos;
+
+  printf("\nCLOCK_REALTIME accuracy test:\n");
+
+  if (0 != clock_gettime(CLOCK_REALTIME, &t_now_ts)) {
+    fprintf(stderr, "clock_test: clock_gettime (now) failed, error %d\n",
+            errno);
+    num_failures++;
+    goto done;
+  }
+  if (0 != gettimeofday(&t_now_tv, NULL)) {
+    fprintf(stderr, "clock_test: gettimeofday (now) failed, error %d\n",
+            errno);
+    num_failures++;
+    goto done;
+  }
+
+  t_now_ts_nanos = t_now_ts.tv_sec * NANOS_PER_UNIT + t_now_ts.tv_nsec;
+  t_now_tv_nanos = t_now_tv.tv_sec * NANOS_PER_UNIT +
+      t_now_tv.tv_usec * NANOS_PER_MICRO;
+
+  printf("clock_gettime:   %20"PRIu64" nS\n", t_now_ts_nanos);
+  printf("gettimeofday:    %20"PRIu64" nS\n", t_now_tv_nanos);
+
+  t_now_diff_nanos = t_now_ts_nanos - t_now_tv_nanos;
+  if (t_now_diff_nanos < 0) {
+    t_now_diff_nanos = -t_now_diff_nanos;
+  }
+  printf("time difference: %20"PRId64" nS\n", t_now_diff_nanos);
+
+  if (t_now_ts_nanos < g_syscall_overhead) {
+    printf("discrepancy too large\n");
+    num_failures++;
+  }
+ done:
+  printf((0 == num_failures) ? "PASSED\n" : "FAILED\n");
+  return num_failures;
+}
+
+struct ThreadInfo {
+  size_t          cycles;
+  struct timespec thread_time;
+  struct timespec process_time;
+  int             num_failures;
+};
+
+void *ThreadFunction(void *ptr) {
+  size_t            i;
+  struct ThreadInfo *info = (struct ThreadInfo *) ptr;
+
+  for (i = 1; i < info->cycles; i++) {
+    /*
+     * Use a barrier to ensure that the compiler does not optimize the
+     * empty loop out as we really only want to burn the thread time.
+     */
+    __sync_synchronize();
+  }
+
+  if (0 != clock_gettime(CLOCK_THREAD_CPUTIME_ID, &info->thread_time)) {
+    fprintf(stderr, "clock_test: clock_gettime (now) failed, error %d\n",
+            errno);
+    info->num_failures++;
+    return NULL;
+  }
+
+  if (0 != clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &info->process_time)) {
+    fprintf(stderr, "clock_test: clock_gettime (now) failed, error %d\n",
+            errno);
+    info->num_failures++;
+    return NULL;
+  }
+
+  return NULL;
+}
+
+static int ClockCpuTimeAccuracyTest(void) {
+  int               num_failures = 0;
+
+  int               err;
+  struct timespec   t_process_start;
+  struct timespec   t_process_end;
+  struct timespec   t_thread_start;
+  struct timespec   t_thread_end;
+
+  uint64_t          thread_elapsed = 0;
+  uint64_t          process_elapsed = 0;
+  uint64_t          child_thread_elapsed = 0;
+  uint64_t          elapsed_lower_bound;
+  uint64_t          elapsed_upper_bound;
+
+  size_t            i;
+  struct ThreadInfo info[10];
+  pthread_t         thread[10];
+
+  printf("\nCLOCK_PROCESS/THREAD_CPUTIME_ID accuracy test:\n");
+
+  if (0 != clock_gettime(CLOCK_THREAD_CPUTIME_ID, &t_thread_start)) {
+    fprintf(stderr, "clock_test: clock_gettime (now) failed, error %d\n",
+            errno);
+    num_failures++;
+    goto done;
+  }
+
+  if (0 != clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &t_process_start)) {
+    fprintf(stderr, "clock_test: clock_gettime (now) failed, error %d\n",
+            errno);
+    num_failures++;
+    goto done;
+  }
+
+  for (i = 0; i < NACL_ARRAY_SIZE(thread); i++) {
+    memset(&info[i], 0, sizeof info[i]);
+    info[i].cycles = i * 10000000;
+    if (0 != (err = pthread_create(&thread[i], NULL,
+                                   ThreadFunction, &info[i]))) {
+      fprintf(stderr, "clock_test: pthread_create failed, error %d\n",
+              err);
+      num_failures++;
+      goto done;
+    }
+  }
+
+  for (i = 0; i < NACL_ARRAY_SIZE(thread); i++) {
+    if (0 != (err = pthread_join(thread[i], NULL))) {
+      fprintf(stderr, "clock_test: pthread_join failed, error %d\n",
+              err);
+      num_failures++;
+      goto done;
+    }
+  }
+
+  if (0 != clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &t_process_end)) {
+    fprintf(stderr, "clock_test: clock_gettime (now) failed, error %d\n",
+            errno);
+    num_failures++;
+    goto done;
+  }
+
+  if (0 != clock_gettime(CLOCK_THREAD_CPUTIME_ID, &t_thread_end)) {
+    fprintf(stderr, "clock_test: clock_gettime (now) failed, error %d\n",
+            errno);
+    num_failures++;
+    goto done;
+  }
+
+  thread_elapsed =
+      (t_thread_end.tv_sec - t_thread_start.tv_sec) * NANOS_PER_UNIT +
+      (t_thread_end.tv_nsec - t_thread_start.tv_nsec);
+
+  process_elapsed =
+      (t_process_end.tv_sec - t_process_start.tv_sec) * NANOS_PER_UNIT +
+      (t_process_end.tv_nsec - t_process_start.tv_nsec);
+
+  for (i = 0; i < NACL_ARRAY_SIZE(thread); i++) {
+    uint64_t thread_elapsed_nanos;
+    uint64_t process_elapsed_nanos;
+
+    if (info[i].num_failures > 0) {
+      num_failures += info[i].num_failures;
+      goto done;
+    }
+
+    thread_elapsed_nanos = info[i].thread_time.tv_sec * NANOS_PER_UNIT +
+        info[i].thread_time.tv_nsec;
+    process_elapsed_nanos = info[i].process_time.tv_sec * NANOS_PER_UNIT +
+        info[i].process_time.tv_nsec;
+    printf("%zd: thread=%20"PRIu64" nS, process=%20"PRIu64" nS\n",
+           i, thread_elapsed_nanos, process_elapsed_nanos);
+    child_thread_elapsed += thread_elapsed_nanos;
+  }
+
+  elapsed_lower_bound = thread_elapsed + child_thread_elapsed;
+  elapsed_upper_bound = (uint64_t) (thread_elapsed +
+      child_thread_elapsed * g_fuzzy_factor + g_syscall_overhead);
+
+  printf("thread time:         %20"PRIu64" nS\n", thread_elapsed);
+  printf("process time:        %20"PRIu64" nS\n", process_elapsed);
+  printf("child thread time:   %20"PRIu64" nS\n", child_thread_elapsed);
+  printf("elapsed lower bound: %20"PRIu64" nS\n", elapsed_lower_bound);
+  printf("elapsed upper bound: %20"PRIu64" nS\n", elapsed_upper_bound);
+
+  if (process_elapsed < elapsed_lower_bound ||
+      elapsed_upper_bound < process_elapsed) {
+    printf("discrepancy too large\n");
+    num_failures++;
+  }
+ done:
+  printf((0 == num_failures) ? "PASSED\n" : "FAILED\n");
+  return num_failures;
+}
+
+int main(int ac, char **av) {
+  uint64_t  sleep_nanos = DEFAULT_NANOSLEEP_TIME;
+  int       opt;
+  uint32_t  num_failures = 0;
+
+  while (-1 != (opt = getopt(ac, av, "cf:o:s:S:"))) {
+    switch (opt) {
+      case 'c':
+        g_cputime = 0;
+        break;
+      case 'f':
+        g_fuzzy_factor = strtod(optarg, (char **) NULL);
+        break;
+      case 'o':
+        g_syscall_overhead = strtoul(optarg, (char **) NULL, 0);
+        break;
+      case 's':
+        g_slop_ms = strtoul(optarg, (char **) NULL, 0);
+        break;
+      case 'S':
+        sleep_nanos = strtoul(optarg, (char **) NULL, 0);
+        break;
+      default:
+        fprintf(stderr, "clock_test: unrecognized option `%c'.\n",
+                opt);
+        fprintf(stderr,
+                "Usage: clock_test [-f fuzz_factor] [-s sleep_nanos]\n"
+                "       [-o syscall_overhead_nanos]\n");
+        return -1;
+    }
+  }
+
+  num_failures += ClockMonotonicAccuracyTest(sleep_nanos);
+  num_failures += ClockRealtimeAccuracyTest();
+  if (g_cputime) {
+    num_failures += ClockCpuTimeAccuracyTest();
+  }
+
+  return num_failures;
+}