tests/thread: Replace busy waiting loops with a loop that sleeps.

dpgeorge · dpgeorge · commit 2847d7431d93 · 2017-02-15T11:12:37.000+11:00
Depending on the thread scheduler, a busy-wait loop can hog the CPU and
make the tests very slow.  So convert such loops to loops that have an
explicit sleep, allowing the worker threads to do their job.
diff --git a/tests/thread/stress_heap.py b/tests/thread/stress_heap.py
@@ -3,6 +3,10 @@
 #
 # MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
 
+try:
+    import utime as time
+except ImportError:
+    import time
 import _thread
 
 def last(l):
@@ -37,6 +41,6 @@ def thread_entry(n):
 for i in range(n_thread):
     _thread.start_new_thread(thread_entry, (10000,))
 
-# busy wait for threads to finish
+# wait for threads to finish
 while n_finished < n_thread:
-    pass
+    time.sleep(1)
diff --git a/tests/thread/thread_lock4.py b/tests/thread/thread_lock4.py
@@ -2,6 +2,10 @@
 #
 # MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
 
+try:
+    import utime as time
+except ImportError:
+    import time
 import _thread
 
 def fac(n):
@@ -39,6 +43,7 @@ def thread_entry():
     with jobs_lock:
         if len(output) == n_jobs:
             break
+    time.sleep(1)
 
 # sort and print the results
 output.sort(key=lambda x: x[0])
diff --git a/tests/thread/thread_qstr1.py b/tests/thread/thread_qstr1.py
@@ -2,6 +2,10 @@
 #
 # MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
 
+try:
+    import utime as time
+except ImportError:
+    import time
 import _thread
 
 # function to check the interned string
@@ -28,8 +32,8 @@ def th(base, n):
 for i in range(n_thread):
     _thread.start_new_thread(th, (i * n_qstr_per_thread, n_qstr_per_thread))
 
-# busy wait for threads to finish
+# wait for threads to finish
 while n_finished < n_thread:
-    pass
+    time.sleep(1)
 
 print('pass')
