[build] add cvitek build scripts

Change-Id: If63ce4a669e5d4d72b8e3b9253336dd99bf74c30

build/tools/cv183x/usb_dl/singleton.py

@@ -0,0 +1,132 @@
+#! /usr/bin/env python
+
+import logging
+from multiprocessing import Process
+import os
+import sys
+import tempfile
+import unittest
+
+
+if sys.platform != "win32":
+    import fcntl
+
+
+class SingleInstanceException(BaseException):
+    pass
+
+
+class SingleInstance(object):
+    def __init__(self, flavor_id="", lockfile=""):
+        self.initialized = False
+        if lockfile:
+            self.lockfile = lockfile
+        else:
+            basename = os.path.splitext(os.path.abspath(sys.argv[0]))[0].replace(
+                "/", "-").replace(":", "").replace("\\", "-") + '-%s' % flavor_id + '.lock'
+            self.lockfile = os.path.normpath(
+                tempfile.gettempdir() + '/' + basename)
+
+        logger.debug("SingleInstance lockfile: " + self.lockfile)
+        if sys.platform == 'win32':
+            try:
+                # file already exists, we try to remove (in case previous
+                # execution was interrupted)
+                if os.path.exists(self.lockfile):
+                    os.unlink(self.lockfile)
+                self.fd = os.open(
+                    self.lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR)
+            except OSError:
+                type, e, tb = sys.exc_info()
+                if e.errno == 13:
+                    logger.error(
+                        "Another instance is already running, quitting.")
+                    raise SingleInstanceException()
+                print(e.errno)
+                raise
+        else:  # non Windows
+            self.fp = open(self.lockfile, 'w')
+            self.fp.flush()
+            try:
+                fcntl.lockf(self.fp, fcntl.LOCK_EX | fcntl.LOCK_NB)
+            except IOError:
+                logger.warning(
+                    "Another instance is already running, quitting.")
+                raise SingleInstanceException()
+        self.initialized = True
+
+    def __del__(self):
+        if not self.initialized:
+            return
+        try:
+            if sys.platform == 'win32':
+                if hasattr(self, 'fd'):
+                    os.close(self.fd)
+                    os.unlink(self.lockfile)
+            else:
+                fcntl.lockf(self.fp, fcntl.LOCK_UN)
+                # os.close(self.fp)
+                if os.path.isfile(self.lockfile):
+                    os.unlink(self.lockfile)
+        except Exception as e:
+            if logger:
+                logger.warning(e)
+            else:
+                print("Unloggable error: %s" % e)
+            sys.exit(-1)
+
+
+def f(name):
+    tmp = logger.level
+    logger.setLevel(logging.CRITICAL)  # we do not want to see the warning
+    try:
+        me2 = SingleInstance(flavor_id=name)  # noqa
+    except SingleInstanceException:
+        sys.exit(-1)
+    logger.setLevel(tmp)
+    pass
+
+
+class testSingleton(unittest.TestCase):
+
+    def test_1(self):
+        me = SingleInstance(flavor_id="test-1")
+        del me  # now the lock should be removed
+        assert True
+
+    def test_2(self):
+        p = Process(target=f, args=("test-2",))
+        p.start()
+        p.join()
+        # the called function should succeed
+        assert p.exitcode == 0, "%s != 0" % p.exitcode
+
+    def test_3(self):
+        me = SingleInstance(flavor_id="test-3")  # noqa -- me should still kept
+        p = Process(target=f, args=("test-3",))
+        p.start()
+        p.join()
+        # the called function should fail because we already have another
+        # instance running
+        assert p.exitcode != 0, "%s != 0 (2nd execution)" % p.exitcode
+        # note, we return -1 but this translates to 255 meanwhile we'll
+        # consider that anything different from 0 is good
+        p = Process(target=f, args=("test-3",))
+        p.start()
+        p.join()
+        # the called function should fail because we already have another
+        # instance running
+        assert p.exitcode != 0, "%s != 0 (3rd execution)" % p.exitcode
+
+    def test_4(self):
+        lockfile = '/tmp/foo.lock'
+        me = SingleInstance(lockfile=lockfile)
+        assert me.lockfile == lockfile
+
+
+logger = logging.getLogger("tendo.singleton")
+
+if __name__ == "__main__":
+    logger.addHandler(logging.StreamHandler())
+    logger.setLevel(logging.DEBUG)
+    unittest.main()