From fc46f2618332037a8c1b58fbce5d616033bff1c9 Mon Sep 17 00:00:00 2001
From: Dan Klein <danklei@cisco.com>
Date: Wed, 26 Aug 2015 15:05:58 +0300
Subject: Rearranged files and external libraries in two different locations,
one for cpp (trex-core/external_libs) and one for python
(trex-core/scripts/external_libs)
---
.../lockfile-0.10.2/lockfile/linklockfile.py | 73 ++++++++++++++++++++++
1 file changed, 73 insertions(+)
create mode 100644 scripts/external_libs/lockfile-0.10.2/lockfile/linklockfile.py
(limited to 'scripts/external_libs/lockfile-0.10.2/lockfile/linklockfile.py')
diff --git a/scripts/external_libs/lockfile-0.10.2/lockfile/linklockfile.py b/scripts/external_libs/lockfile-0.10.2/lockfile/linklockfile.py
new file mode 100644
index 00000000..9c506734
--- /dev/null
+++ b/scripts/external_libs/lockfile-0.10.2/lockfile/linklockfile.py
@@ -0,0 +1,73 @@
+from __future__ import absolute_import
+
+import time
+import os
+
+from . import (LockBase, LockFailed, NotLocked, NotMyLock, LockTimeout,
+ AlreadyLocked)
+
+class LinkLockFile(LockBase):
+ """Lock access to a file using atomic property of link(2).
+
+ >>> lock = LinkLockFile('somefile')
+ >>> lock = LinkLockFile('somefile', threaded=False)
+ """
+
+ def acquire(self, timeout=None):
+ try:
+ open(self.unique_name, "wb").close()
+ except IOError:
+ raise LockFailed("failed to create %s" % self.unique_name)
+
+ timeout = timeout is not None and timeout or self.timeout
+ end_time = time.time()
+ if timeout is not None and timeout > 0:
+ end_time += timeout
+
+ while True:
+ # Try and create a hard link to it.
+ try:
+ os.link(self.unique_name, self.lock_file)
+ except OSError:
+ # Link creation failed. Maybe we've double-locked?
+ nlinks = os.stat(self.unique_name).st_nlink
+ if nlinks == 2:
+ # The original link plus the one I created == 2. We're
+ # good to go.
+ return
+ else:
+ # Otherwise the lock creation failed.
+ if timeout is not None and time.time() > end_time:
+ os.unlink(self.unique_name)
+ if timeout > 0:
+ raise LockTimeout("Timeout waiting to acquire"
+ " lock for %s" %
+ self.path)
+ else:
+ raise AlreadyLocked("%s is already locked" %
+ self.path)
+ time.sleep(timeout is not None and timeout/10 or 0.1)
+ else:
+ # Link creation succeeded. We're good to go.
+ return
+
+ def release(self):
+ if not self.is_locked():
+ raise NotLocked("%s is not locked" % self.path)
+ elif not os.path.exists(self.unique_name):
+ raise NotMyLock("%s is locked, but not by me" % self.path)
+ os.unlink(self.unique_name)
+ os.unlink(self.lock_file)
+
+ def is_locked(self):
+ return os.path.exists(self.lock_file)
+
+ def i_am_locking(self):
+ return (self.is_locked() and
+ os.path.exists(self.unique_name) and
+ os.stat(self.unique_name).st_nlink == 2)
+
+ def break_lock(self):
+ if os.path.exists(self.lock_file):
+ os.unlink(self.lock_file)
+
--
cgit