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authorReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
committerReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
commitf4092abdf94af6a99aff944d6264bc1284e8bdd4 (patch)
tree2ac1c9cc16ceb93edb2c4382c088dac5aeafdf0f /nx-X11/extras/fontconfig/doc/fcatomic.fncs
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+/*
+ * $Id: fcatomic.fncs,v 1.3 2005/06/28 01:01:03 alanc Exp $
+ *
+ * Copyright © 2003 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission. Keith Packard makes no
+ * representations about the suitability of this software for any purpose. It
+ * is provided "as is" without express or implied warranty.
+ *
+ * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+@RET@ FcAtomic *
+@FUNC@ FcAtomicCreate
+@TYPE1@ const FcChar8 * @ARG1@ file
+@PURPOSE@ create an FcAtomic object
+@DESC@
+Creates a data structure containing data needed to control access to <parameter>file</parameter>.
+Writing is done to a separate file. Once that file is complete, the original
+configuration file is atomically replaced so that reading process always see
+a consistent and complete file without the need to lock for reading.
+@@
+
+@RET@ FcBool
+@FUNC@ FcAtomicLock
+@TYPE1@ FcAtomic * @ARG1@ atomic
+@PURPOSE@ lock a file
+@DESC@
+Attempts to lock the file referenced by <parameter>atomic</parameter>. Returns FcFalse if the
+file is locked by another process, else returns FcTrue and leaves the file
+locked.
+@@
+
+@RET@ FcChar8 *
+@FUNC@ FcAtomicNewFile
+@TYPE1@ FcAtomic * @ARG1@ atomic
+@PURPOSE@ return new temporary file name
+@DESC@
+Returns the filename for writing a new version of the file referenced
+by <parameter>atomic</parameter>.
+@@
+
+@RET@ FcChar8 *
+@FUNC@ FcAtomicOrigFile
+@TYPE1@ FcAtomic * @ARG1@ atomic
+@PURPOSE@ return original file name
+@DESC@
+Returns the file refernced by <parameter>atomic</parameter>.
+@@
+
+@RET@ FcBool
+@FUNC@ FcAtomicReplaceOrig
+@TYPE1@ FcAtomic * @ARG1@ atomic
+@PURPOSE@ replace original with new
+@DESC@
+Replaces the original file referenced by <parameter>atomic</parameter> with the new file.
+@@
+
+@RET@ void
+@FUNC@ FcAtomicDeleteNew
+@TYPE1@ FcAtomic * @ARG1@ atomic
+@PURPOSE@ delete new file
+@DESC@
+Deletes the new file. Used in error recovery to back out changes.
+@@
+
+@RET@ void
+@FUNC@ FcAtomicUnlock
+@TYPE1@ FcAtomic * @ARG1@ atomic
+@PURPOSE@ unlock a file
+@DESC@
+Unlocks the file.
+@@
+
+@RET@ void
+@FUNC@ FcAtomicDestroy
+@TYPE1@ FcAtomic * @ARG1@ atomic
+@PURPOSE@ destroy an FcAtomic object
+@DESC@
+Destroys <parameter>atomic</parameter>.
+@@