zynaddsubfx

commit b5f6a4049a4b9daaacdcc9861f94c2be0d658a58
parent 696a83d076299e1107280224fe448977df228311
Author: Johannes Lorenz <j.git@lorenz-ho.me>
Date:   Mon,  1 Jul 2019 03:34:19 +0200

Add MemLocker

Diffstat:
M
src/Misc/CMakeLists.txt
 | 
1
+
A
src/Misc/MemLocker.cpp
 | 
59
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
src/Misc/MemLocker.h
 | 
30
++++++++++++++++++++++++++++++
M
src/main.cpp
 | 
7
+++++++

4 files changed, 97 insertions(+), 0 deletions(-)
diff --git a/src/Misc/CMakeLists.txt b/src/Misc/CMakeLists.txt
@@ -17,6 +17,7 @@ set(zynaddsubfx_misc_SRCS
     Misc/Allocator.cpp
     Misc/CallbackRepeater.cpp
     Misc/Schema.cpp
+    Misc/MemLocker.cpp
 )
 
 
diff --git a/src/Misc/MemLocker.cpp b/src/Misc/MemLocker.cpp
@@ -0,0 +1,59 @@
+/*
+  ZynAddSubFX - a software synthesizer
+
+  MemLocker.cpp - Memory page locker
+  Copyright (C) 2019-2019 Johannes Lorenz
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of version 2 of the GNU General Public License
+  as published by the Free Software Foundation.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License (version 2 or later) for more details.
+
+  You should have received a copy of the GNU General Public License (version 2)
+  along with this program; if not, write to the Free Software Foundation,
+  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+
+*/
+
+#include "MemLocker.h"
+
+#ifndef WIN32
+#include <cstdio>
+#include <sys/mman.h>
+#endif
+
+namespace zyn {
+
+void MemLocker::lock()
+{
+#ifndef WIN32
+    if (!isLocked)
+    {
+        if (mlockall (MCL_CURRENT | MCL_FUTURE)) {
+            perror ("Warning: Can not lock memory");
+        } else {
+            isLocked = true;
+        }
+    }
+#endif
+}
+
+void MemLocker::unlock()
+{
+#ifndef WIN32
+    if (isLocked)
+    {
+        if (munlockall ()) {
+            perror ("Warning: Can not unlock memory");
+        } else {
+            isLocked = false;
+        }
+    }
+#endif
+}
+
+}
diff --git a/src/Misc/MemLocker.h b/src/Misc/MemLocker.h
@@ -0,0 +1,30 @@
+/*
+  ZynAddSubFX - a software synthesizer
+
+  MemLocker.h - Memory page locker
+  Copyright (C) 2019-2019 Johannes Lorenz
+  Author: Johannes Lorenz
+
+  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.
+*/
+
+namespace zyn {
+
+//! Class to lock all pages in memory 
+class MemLocker
+{
+	bool isLocked = false;
+public:
+	MemLocker() = default;
+	~MemLocker() { unlock(); }
+	
+	//! try to lock all current and future pages, if not already locked
+	void lock();
+	//! try to unlock all pages, if locked
+	void unlock();
+};
+
+}
diff --git a/src/main.cpp b/src/main.cpp
@@ -36,6 +36,7 @@
 #include "Params/PADnoteParameters.h"
 
 #include "DSP/FFTwrapper.h"
+#include "Misc/MemLocker.h"
 #include "Misc/PresetExtractor.h"
 #include "Misc/Master.h"
 #include "Misc/Part.h"
@@ -761,6 +762,9 @@ int main(int argc, char *argv[])
     }
 #endif
 
+    MemLocker mem_locker;
+    mem_locker.lock();
+
     printf("[INFO] Main Loop...\n");
     bool already_exited = false;
     while(Pexitprogram == 0) {
@@ -814,6 +818,9 @@ done:
 #endif
 #endif
     }
+
+    mem_locker.unlock();
+
 #ifdef ZEST_GUI
 #ifndef WIN32
     if(!already_exited) {