diff options
author | Thiago Macieira <thiago.macieira@intel.com> | 2012-10-25 12:38:13 -0700 |
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committer | The Qt Project <gerrit-noreply@qt-project.org> | 2013-01-15 03:29:29 +0100 |
commit | f927efd77a8e75e330b3592996277ad6e6eb6a8d (patch) | |
tree | b7226a2eb337446a9a256b28fae469d9847b5b3b /config.tests | |
parent | dbfa6518890f4e6c4af6da92df45803ecfe0309a (diff) |
Add support for Linux eventfd(7) in the UNIX event loop
eventfd(7) uses less resources than a pipe, as it only needs to store a
single 64-bit integer, as opposed to a full buffer.
It was introduced first on Linux version 2.6.22 and glibc 2.7. However,
both the configure-time test and the runtime usage require the use of
EFD_CLOEXEC for thread-safety, so this code will be enabled only for
Linux 2.6.27 and up as well as glibc 2.9 and up.
Change-Id: Ic7e10b28d7b1d4ca24be614ed84055c4429a68e4
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Diffstat (limited to 'config.tests')
-rw-r--r-- | config.tests/unix/eventfd/eventfd.pro | 3 | ||||
-rw-r--r-- | config.tests/unix/eventfd/main.cpp | 51 |
2 files changed, 54 insertions, 0 deletions
diff --git a/config.tests/unix/eventfd/eventfd.pro b/config.tests/unix/eventfd/eventfd.pro new file mode 100644 index 0000000000..c41204f49f --- /dev/null +++ b/config.tests/unix/eventfd/eventfd.pro @@ -0,0 +1,3 @@ +SOURCES = main.cpp +CONFIG -= qt dylib +mac:CONFIG -= app_bundle diff --git a/config.tests/unix/eventfd/main.cpp b/config.tests/unix/eventfd/main.cpp new file mode 100644 index 0000000000..0523ee0320 --- /dev/null +++ b/config.tests/unix/eventfd/main.cpp @@ -0,0 +1,51 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Intel Corporation +** Contact: http://www.qt-project.org/legal +** +** This file is part of the config.tests of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <sys/eventfd.h> + +int main() +{ + eventfd_t value; + int fd = eventfd(0, EFD_CLOEXEC); + eventfd_read(fd, &value); + eventfd_write(fd, value); + return 0; +} |