1 files changed, 146 insertions, 0 deletions
diff --git a/src/sequencer/SequencerMmapper.cpp b/src/sequencer/SequencerMmapper.cpp
new file mode 100644
index 0000000..3a634ba
--- /dev/null
+++ b/src/sequencer/SequencerMmapper.cpp
@@ -0,0 +1,146 @@
+
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <kstddirs.h>
+
+#include <qfile.h>
+
+#include "SequencerMmapper.h"
+#include "misc/Debug.h"
+
+#include "base/RealTime.h"
+#include "base/Exception.h"
+#include "sound/MappedEvent.h"
+#include "sound/MappedComposition.h"
+
+namespace Rosegarden
+{
+
+// Seems not to be properly defined under some gcc 2.95 setups
+#ifndef MREMAP_MAYMOVE
+#define MREMAP_MAYMOVE 1
+#endif
+
+SequencerMmapper::SequencerMmapper():
+        m_fileName(createFileName()),
+        m_fd( -1),
+        m_mmappedBuffer(0),
+        m_mmappedSize(sizeof(SequencerDataBlock))
+{
+    // just in case
+    QFile::remove
+        (m_fileName);
+
+    m_fd = ::open(m_fileName.latin1(),
+                  O_RDWR | O_CREAT | O_TRUNC,
+                  S_IRUSR | S_IWUSR);
+
+    if (m_fd < 0) {
+        SEQUENCER_DEBUG << "SequencerMmapper : Couldn't open " << m_fileName
+        << endl;
+        throw Exception("Couldn't open " + std::string(m_fileName.data()));
+    }
+
+    setFileSize(m_mmappedSize);
+
+    //
+    // mmap() file for writing
+    //
+    m_mmappedBuffer = ::mmap(0, m_mmappedSize,
+                             PROT_READ | PROT_WRITE,
+                             MAP_SHARED, m_fd, 0);
+
+    if (m_mmappedBuffer == (void*) - 1) {
+        SEQUENCER_DEBUG <<
+        QString("mmap failed : (%1) %2\n").arg(errno).arg(strerror(errno));
+        throw Exception("mmap failed");
+    }
+
+    SEQUENCER_DEBUG << "SequencerMmapper : mmap size : " << m_mmappedSize
+    << " at " << (void*)m_mmappedBuffer << endl;
+
+    // initialise
+    init();
+}
+
+SequencerMmapper::~SequencerMmapper()
+{
+    ::munmap(m_mmappedBuffer, m_mmappedSize);
+    ::close(m_fd);
+    QFile::remove
+        (m_fileName);
+}
+
+void
+SequencerMmapper::init()
+{
+    SEQUENCER_DEBUG << "SequencerMmapper::init()\n";
+
+    m_sequencerDataBlock = new (m_mmappedBuffer)
+                           SequencerDataBlock(true);
+
+    ::msync(m_mmappedBuffer, m_mmappedSize, MS_ASYNC);
+}
+
+void
+SequencerMmapper::setFileSize(size_t size)
+{
+    SEQUENCER_DEBUG << "SequencerMmapper : setting size of "
+    << m_fileName << " to " << size << endl;
+    // rewind
+    ::lseek(m_fd, 0, SEEK_SET);
+
+    // enlarge the file
+    // (seek() to wanted size, then write a byte)
+    //
+    if (::lseek(m_fd, size - 1, SEEK_SET) == -1) {
+        std::cerr << "WARNING: SequencerMmapper : Couldn't lseek in " << m_fileName
+        << " to " << size << std::endl;
+        throw Exception("lseek failed");
+    }
+
+    if (::write(m_fd, "\0", 1) != 1) {
+        std::cerr << "WARNING: SequencerMmapper : Couldn't write byte in  "
+        << m_fileName << std::endl;
+        throw Exception("write failed");
+    }
+}
+
+QString
+SequencerMmapper::createFileName()
+{
+    return KGlobal::dirs()->resourceDirs("tmp").last() +
+           "/rosegarden_sequencer_timing_block";
+}
+
+}
+