# HG changeset patch
# User Chris Cannam
# Date 1427794612 -3600
# Node ID c1e43c8d2527af44971a1f30c5231e94ab01b2a2
# Parent  c49d52386cde0844cef30d8904a4fe409cec3d5c
Thread-local debug was causing crash on exit with Qt 5.4.x. But we introduced that because QDebug itself was crashing when used from multiple threads. Replace with simpler fstream version

diff -r c49d52386cde -r c1e43c8d2527 base/Debug.cpp
--- a/base/Debug.cpp	Wed Mar 25 10:54:51 2015 +0000
+++ b/base/Debug.cpp	Tue Mar 31 10:36:52 2015 +0100
@@ -16,70 +16,57 @@
 #include "Debug.h"
 #include "ResourceFinder.h"
 
-#include <QString>
+#include <QMutex>
+#include <QDir>
 #include <QUrl>
-#include <QMutex>
-#include <QMutexLocker>
-#include <QFile>
-#include <QDir>
 #include <QCoreApplication>
-#include <QDateTime>
-#include <QThreadStorage>
 
-#include <cstdio>
+#ifndef NDEBUG
 
-static QThreadStorage<QDebug *> debugs;
+static SVDebug *debug = 0;
 static QMutex mutex;
-static char *prefix = 0;
 
-QDebug &
-getSVDebug()
+SVDebug &getSVDebug() {
+    mutex.lock();
+    if (!debug) {
+        debug = new SVDebug();
+    }
+    mutex.unlock();
+    return *debug;
+}
+
+SVDebug::SVDebug() :
+    m_prefix(0),
+    m_ok(false),
+    m_eol(false)
 {
-    mutex.lock();
-
-    QDebug *debug = 0;
-
     QString pfx = ResourceFinder().getUserResourcePrefix();
     QDir logdir(QString("%1/%2").arg(pfx).arg("log"));
 
-    if (!prefix) {
-        prefix = strdup(QString("[%1]")
-                        .arg(QCoreApplication::applicationPid())
-                        .toLatin1().data());
-    }
+    m_prefix = strdup(QString("[%1]")
+                      .arg(QCoreApplication::applicationPid())
+                      .toLatin1().data());
 
     //!!! what to do if mkpath fails?
     if (!logdir.exists()) logdir.mkpath(logdir.path());
 
-    if (!debugs.hasLocalData()) {
-        QFile *logFile = new QFile(logdir.path() + "/sv-debug.log");
-        if (logFile->open(QIODevice::WriteOnly | QIODevice::Append)) {
-            QDebug(QtDebugMsg) << (const char *)prefix
-                               << "Opened debug log file "
-                               << logFile->fileName();
-            debug = new QDebug(logFile);
-        } else {
-            QDebug(QtWarningMsg) << (const char *)prefix
-                                 << "Failed to open debug log file "
-                                 << logFile->fileName()
-                                 << " for writing, using console debug instead";
-            delete logFile;
-            logFile = 0;
-            debug = new QDebug(QtDebugMsg);
-        }
-        debugs.setLocalData(debug);
-        *debug << endl << (const char *)prefix << "Log started at "
-               << QDateTime::currentDateTime().toString();
+    QString fileName = logdir.path() + "/sv-debug.log";
+
+    m_stream.open(fileName.toLocal8Bit().data(), std::ios_base::out);
+
+    if (!m_stream) {
+        QDebug(QtWarningMsg) << (const char *)m_prefix
+                             << "Failed to open debug log file "
+                             << fileName << " for writing";
     } else {
-        debug = debugs.localData();
+        cerr << m_prefix << ": Log file is " << fileName << endl;
+        m_ok = true;
     }
+}
 
-    mutex.unlock();
-
-    QDebug &dref = *debug;
-    dref << endl << (const char *)prefix;
-
-    return dref;
+SVDebug::~SVDebug()
+{
+    m_stream.close();
 }
 
 QDebug &
@@ -89,6 +76,8 @@
     return dbg;
 }
 
+#endif
+
 std::ostream &
 operator<<(std::ostream &target, const QString &str)
 {
diff -r c49d52386cde -r c1e43c8d2527 base/Debug.h
--- a/base/Debug.h	Wed Mar 25 10:54:51 2015 +0000
+++ b/base/Debug.h	Tue Mar 31 10:36:52 2015 +0100
@@ -13,8 +13,8 @@
     COPYING included with this distribution for more information.
 */
 
-#ifndef _DEBUG_H_
-#define _DEBUG_H_
+#ifndef SV_DEBUG_H
+#define SV_DEBUG_H
 
 #include <QDebug>
 #include <QTextStream>
@@ -23,6 +23,7 @@
 
 #include <string>
 #include <iostream>
+#include <fstream>
 
 class QString;
 class QUrl;
@@ -37,29 +38,40 @@
 
 #ifndef NDEBUG
 
-extern QDebug &getSVDebug();
+class SVDebug {
+public:
+    SVDebug();
+    ~SVDebug();
+
+    template <typename T>
+    inline SVDebug &operator<<(const T &t) {
+        if (m_ok) {
+            if (m_eol) {
+                m_stream << m_prefix << " ";
+            }
+            m_stream << t;
+            m_eol = false;
+        }
+        return *this;
+    }
+
+    inline SVDebug &operator<<(QTextStreamFunction) {
+        m_stream << std::endl;
+        m_eol = true;
+        return *this;
+    }
+
+private:
+    std::fstream m_stream;
+    char *m_prefix;
+    bool m_ok;
+    bool m_eol;
+};
+
+extern SVDebug &getSVDebug();
 
 #define SVDEBUG getSVDebug()
 
-inline QDebug &operator<<(QDebug &d, const RealTime &rt) {
-    d << rt.toString();
-    return d;
-}
-
-inline QDebug &operator<<(QDebug &d, const Vamp::RealTime &rt) {
-    d << rt.toString();
-    return d;
-}
-
-template <typename T>
-inline QDebug &operator<<(QDebug &d, const T &t) {
-    QString s;
-    QTextStream ts(&s);
-    ts << t;
-    d << s;
-    return d;
-}
-
 #else
 
 class NoDebug