Fix our multi-threaded unit tests

pyrasite/tests/test_code_injection.py

@@ -47,8 +47,8 @@ class TestCodeInjection(unittest.TestCase):
             os.unlink(program)
 
     def test_many_payloads_into_program_with_many_threads(self):
-        program = generate_program(threads=50)
-        num_payloads = 50
+        program = generate_program(threads=25)
+        num_payloads = 25
         try:
             for exe in interpreters():
                 p = run_program(program, exe=exe)

pyrasite/tests/utils.py

@@ -30,21 +30,20 @@ def generate_program(threads=1):
         import os, time, threading
         running = True
         pidfile = '/tmp/pyrasite_%d' % os.getpid()
+        open(pidfile, 'w').close()
         def cpu_bound():
-            i = 2
-            y = 0
-            def fib(n):
-                return fib(n - 1) + fib(n - 2)
+            i = 0
             while running:
-                y += fib(i)
                 i += 1
-        while os.path.exists(pidfile):
-            time.sleep(0.1)
     """)
     # CPU-bound threads
     for t in range(threads):
         script += "threading.Thread(target=cpu_bound).start()\n"
-    script += "open(pidfile, 'w').close()\n"
+    script += textwrap.dedent("""
+        while os.path.exists(pidfile):
+            time.sleep(0.1)
+        running = False
+    """)
     tmp.write(script)
     tmp.close()
     return filename