implement job server

Instead of trying to block recursive jom calls, use a job server
similar to what GNU make provides.

Task-number: QTCREATORBUG-10846
Change-Id: I0e17bb3a4e22e911da58f90e1bebc20aa5e6c75a
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/jomlib/jobclientacquirehelper.h b/src/jomlib/jobclientacquirehelper.h
new file mode 100644
index 0000000..d0f82c8
--- /dev/null
+++ b/src/jomlib/jobclientacquirehelper.h
@@ -0,0 +1,47 @@
+/****************************************************************************
+ **
+ ** Copyright (C) 2015 The Qt Company Ltd.
+ ** Contact: http://www.qt.io/licensing/
+ **
+ ** This file is part of the jom project on Trolltech Labs.
+ **
+ ** This file may be used under the terms of the GNU General Public
+ ** License version 2.0 or 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 GNU
+ ** General Public Licensing requirements will be met:
+ ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
+ ** http://www.gnu.org/copyleft/gpl.html.
+ **
+ ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ **
+ ****************************************************************************/
+
+#ifndef JOBCLIENTACQUIRETHREAD_H
+#define JOBCLIENTACQUIRETHREAD_H
+
+#include <QObject>
+#include <QSystemSemaphore>
+
+namespace NMakeFile {
+
+class JobClientAcquireHelper : public QObject
+{
+    Q_OBJECT
+public:
+    explicit JobClientAcquireHelper(QSystemSemaphore *semaphore);
+
+public slots:
+    void acquire();
+
+signals:
+    void acquired();
+
+private:
+    QSystemSemaphore *m_semaphore;
+};
+
+} // namespace NMakeFile
+
+#endif // JOBCLIENTACQUIRETHREAD_H