Added a python script to run test cases repeatedly. This helps with debugging race conditions.

src/run.py

@@ -0,0 +1,81 @@
+import os
+import sys
+import time
+import glob
+import fnmatch
+from optparse import OptionParser
+
+rustDir = os.path.abspath('.')
+rustTestDir = rustDir + "/test";
+rustTestRunPassDir = rustTestDir + "/run-pass";
+rustTestRunFailDir = rustTestDir + "/run-fail";
+rustTestCompileFailDir = rustTestDir + "/run-compile-fail";
+rustTestRunBenchDir = rustTestDir + "/run-bench";
+
+parser = OptionParser()
+parser.set_usage("run.py [options] pattern : run.py -n 100 \"bas*\" -q");
+parser.add_option("-n", dest="repetitions", 
+                  help="number of repetitions", metavar="NUMBER")
+parser.add_option("-q", action="store_true", dest="quiet", default=False, 
+                  help="suppresses rust log output")
+parser.add_option("-p", action="store_true", dest="printSource", 
+                  default=False, help="prints the test case's source")
+parser.add_option("-s", dest="seed", metavar="NUMBER", default=-1,
+                  help="seeds the rust scheduler, use -1 to generate seeds, "
+                  + " or >= 0 to specify a seed")
+                  
+(options, args) = parser.parse_args()
+
+def getRustTests(filter):
+    tests = []
+    for root, dirnames, filenames in os.walk(rustTestDir):
+      for filename in fnmatch.filter(filenames, filter + '.rs'):
+          tests.append(os.path.join(root, filename).
+                       replace(rustDir + "/", ""));
+    return tests
+
+
+if len(args) != 1:
+    parser.print_usage();
+    sys.exit(0);
+
+tests = getRustTests(args[0]);
+
+# Make 
+for rustProgram in tests:
+    print "Making: " + rustProgram;
+    result = os.system("make " + rustProgram.replace(".rs", ".x86")) >> 8;
+    if (result != 0):
+        print "Make failed!";
+        sys.exit(1);
+
+if (options.quiet):
+    os.putenv("RUST_LOG", "none")
+
+# Rut
+totalPassed = 0;
+for rustProgram in tests:
+    repetitions = 1;
+    if (options.repetitions):
+        repetitions = int(options.repetitions);
+    passed = 0;
+    if (options.printSource):
+        os.system("cat " + rustProgram);
+    for i in range(0, repetitions):
+        print "Running: " + rustProgram + " " + str(i) + \
+              " of " + str(repetitions);
+        if (options.seed):
+            if (int(options.seed) >= 0):
+              os.putenv("RUST_SEED", options.seed);
+            else:
+              os.putenv("RUST_SEED", str(i));
+        result = os.system(rustProgram.replace(".rs", ".x86"));
+        exitStatus = result >> 8;
+        signalNumber = result & 0xF;
+        if (result == 0):
+            passed += 1;
+    print "Result for: " + rustProgram + " " + str(passed) + \
+          " of " + str(repetitions) + " passed.";
+    totalPassed += passed;
+print "Total: " + str(totalPassed) + " of " + \
+      str(len(tests) * repetitions) + " passed."