From: Guido van Rossum <guido@python.org>
Date: Tue, 3 May 1994 14:46:18 +0000 (+0000)
Subject: Module to lock open files using fcntl()
X-Git-Tag: v1.0.2~12
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=19806f4ce287333288f4b02e2da5413992e036b1;p=thirdparty%2FPython%2Fcpython.git

Module to lock open files using fcntl()
---

diff --git a/Lib/lib-old/lockfile.py b/Lib/lib-old/lockfile.py
new file mode 100644
index 000000000000..3a251d720b09
--- /dev/null
+++ b/Lib/lib-old/lockfile.py
@@ -0,0 +1,15 @@
+import struct, fcntl, FCNTL
+
+def writelock(f):
+	_lock(f, FCNTL.F_WRLCK)
+
+def readlock(f):
+	_lock(f, FCNTL.F_RDLCK)
+
+def unlock(f):
+	_lock(f, FCNTL.F_UNLCK)
+
+def _lock(f, op):
+	dummy = fcntl.fcntl(f.fileno(), FCNTL.F_SETLKW,
+			    struct.pack('2h8l', op,
+					0, 0, 0, 0, 0, 0, 0, 0, 0))
diff --git a/Lib/lockfile.py b/Lib/lockfile.py
new file mode 100644
index 000000000000..3a251d720b09
--- /dev/null
+++ b/Lib/lockfile.py
@@ -0,0 +1,15 @@
+import struct, fcntl, FCNTL
+
+def writelock(f):
+	_lock(f, FCNTL.F_WRLCK)
+
+def readlock(f):
+	_lock(f, FCNTL.F_RDLCK)
+
+def unlock(f):
+	_lock(f, FCNTL.F_UNLCK)
+
+def _lock(f, op):
+	dummy = fcntl.fcntl(f.fileno(), FCNTL.F_SETLKW,
+			    struct.pack('2h8l', op,
+					0, 0, 0, 0, 0, 0, 0, 0, 0))