change wheel's sleep timer to make it less flaky (twitter#143)

* change wheel's sleep timer to make it less flaky

* update .travis.yml

* update sleep timer

* missed a tick

* longer tick

* rearrange

.travis.yml

@@ -75,6 +75,11 @@ matrix:
       osx_image: xcode7.1
       env: C_COMPILER=clang
 
+    # clang 4.2 on osx
+    - os: osx
+      osx_image: xcode8.2
+      env: C_COMPILER=clang
+
 
 before_install:
   # for osx: 0. update brew; 1. install cmake if missing; 2. (gcc) unlink pre-installed gcc; 3. (gcc) install desired version of gcc
@@ -93,3 +98,4 @@ script:
   - cmake ..
   - make -j
   - make check
+  - egrep -r ":F:|:E:" . || true

test/time/wheel/check_wheel.c

@@ -116,7 +116,7 @@ END_TEST
 
 START_TEST(test_timing_wheel_recur)
 {
-#define TICK_NS 10000000
+#define TICK_NS 50000000
 #define NSLOT 3
 #define NTICK 2
 
@@ -136,11 +136,13 @@ START_TEST(test_timing_wheel_recur)
 
     timing_wheel_insert(tw, &delay, true, _incr_cb, &i);
 
-    nanosleep(&ts, NULL);
+    /* tick unchanged */
     timing_wheel_execute(tw);
     ck_assert_int_eq(tw->nprocess, 0);
     ck_assert_int_eq(tw->nevent, 1);
 
+    /* next 2 tick */
+    nanosleep(&ts, NULL);
     nanosleep(&ts, NULL);
     timing_wheel_execute(tw);
     ck_assert_int_eq(tw->nevent, 1);
@@ -152,6 +154,7 @@ START_TEST(test_timing_wheel_recur)
     ck_assert_int_eq(tw->nprocess, 2);
     ck_assert_int_eq(i, 2);
 
+    /* flush events */
     timing_wheel_stop(tw);
     timing_wheel_flush(tw);
     ck_assert_int_eq(tw->nevent, 0);