src/common/Thread.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2007 Christian Schoenebeck                       *
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 *   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 for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_THREAD_H__
#define __LS_THREAD_H__

//FIXME: this is a temorary solution because of problems with condition variables we use a polling lock in SignalStartThread()
#if defined(WIN32)
#define WIN32_SIGNALSTARTTHREAD_WORKAROUND 1
#endif

#include <iostream>
#include <stdio.h>
#include <stdlib.h>

#if defined(WIN32)
#include <windows.h>
#else
#include <sched.h>
#include <sys/mman.h>
#include <memory.h>
#include <pthread.h>
#endif
#include <errno.h>

#include "Condition.h"

namespace LinuxSampler {

/// Abstract base class for classes that need to run in an own thread.
class Thread {
    public:
        Thread(bool LockMemory, bool RealTime, int PriorityMax, int PriorityDelta);
        virtual ~Thread();
        virtual int  StartThread();
        virtual int  StopThread();
        virtual int  SignalStartThread();
        virtual int  SignalStopThread();
        virtual bool IsRunning();
        virtual int  SetSchedulingPriority(); //FIXME: should be private
        virtual int  LockMemory();            //FIXME: should be private
        virtual void EnableDestructor();      //FIXME: should be private
        virtual int  Destructor();            //FIXME: should be private
        virtual int  Main() = 0; ///< This method needs to be implemented by the descendant and is the entry point for the new thread. FIXME: should be protected

        /**
         * Allocates an aligned block of memory. Allocated memory blocks
         * need to be freed using freeAlignedMem().
         *
         * @param boundary - the alignement boundary, usually a power of 2
         *                   e.g. 4 but it can be an arbitrary number
         *                   between 1 and 128
         * @param size     - size in bytes to be allocated
         * @returns  pointer to the allocated memory block
         */
        static void* allocAlignedMem(size_t boundary, size_t size) {
            unsigned char *ptr = (unsigned char *)malloc(size+boundary);
            size_t offset = boundary - ((size_t)ptr % boundary);
            ptr[offset-1] = (unsigned char)offset;
            return (ptr + offset);
        }

        /**
         * Frees an aligned block of memory allocated with allocAlignedMem()
         *
         * @param ptr - pointer to the memory block
         */
        static void freeAlignedMem(void *ptr) {
            unsigned char *p = (unsigned char *)ptr;
            p -= p[-1];
            free(p);
        }

        /**
         * Locks a region of memory in physical RAM.
         *
         * @param addr - address of the memory block
         * @param size - size of the memory block
         * @return true if the locking succeded, otherwise false
         */
        static bool lockMemory(void *addr, size_t size) {
            #if defined(WIN32)
            return VirtualLock(addr, size);
            #else
            return !mlock(addr, size);
            #endif
        }

        /**
         * Unlocks a region of memory in physical RAM.
         *
         * @param addr - address of the memory block
         * @param size - size of the memory block
         * @return true if the unlocking succeded, otherwise false
         */
        static bool unlockMemory(void *addr, size_t size) {
            #if defined(WIN32)
            return VirtualUnlock(addr, size);
            #else
            return !munlock(addr, size);
            #endif
        }

    private:
    #if defined(WIN32)
        HANDLE hThread;
        DWORD lpThreadId;
        #if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
        bool win32isRunning;
        #endif
    #else
        pthread_attr_t  __thread_attr;
        pthread_t       __thread_id;
        pthread_key_t   __thread_destructor_key;
    #endif
        Condition       RunningCondition;
        int             PriorityMax;
        int             PriorityDelta;
        bool            isRealTime;
        bool            bLockedMemory;
};

} // namespace LinuxSampler

#endif // __LS_THREAD_H__
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5	schoenebeck	56	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	1212	* Copyright (C) 2005 - 2007 Christian Schoenebeck *
7	schoenebeck	53	* *
8			* This program is free software; you can redistribute it and/or modify *
9			* it under the terms of the GNU General Public License as published by *
10			* the Free Software Foundation; either version 2 of the License, or *
11			* (at your option) any later version. *
12			* *
13			* This program is distributed in the hope that it will be useful, *
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16			* GNU General Public License for more details. *
17			* *
18			* You should have received a copy of the GNU General Public License *
19			* along with this program; if not, write to the Free Software *
20			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21			* MA 02111-1307 USA *
22			***************************************************************************/
23
24	schoenebeck	1424	#ifndef __LS_THREAD_H__
25			#define __LS_THREAD_H__
26	schoenebeck	53
27	schoenebeck	1482	//FIXME: this is a temorary solution because of problems with condition variables we use a polling lock in SignalStartThread()
28			#if defined(WIN32)
29	senoner	1481	#define WIN32_SIGNALSTARTTHREAD_WORKAROUND 1
30	schoenebeck	1482	#endif
31	senoner	1481
32	schoenebeck	53	#include <iostream>
33			#include <stdio.h>
34			#include <stdlib.h>
35	senoner	1481
36			#if defined(WIN32)
37			#include <windows.h>
38			#else
39	schoenebeck	53	#include <sched.h>
40			#include <sys/mman.h>
41			#include <memory.h>
42			#include <pthread.h>
43	senoner	1481	#endif
44	schoenebeck	53	#include <errno.h>
45
46	schoenebeck	1221	#include "Condition.h"
47
48	schoenebeck	1212	namespace LinuxSampler {
49
50	schoenebeck	53	/// Abstract base class for classes that need to run in an own thread.
51			class Thread {
52			public:
53	schoenebeck	392	Thread(bool LockMemory, bool RealTime, int PriorityMax, int PriorityDelta);
54	schoenebeck	53	virtual ~Thread();
55			virtual int StartThread();
56			virtual int StopThread();
57	schoenebeck	57	virtual int SignalStartThread();
58	schoenebeck	53	virtual int SignalStopThread();
59	schoenebeck	1212	virtual bool IsRunning();
60	schoenebeck	53	virtual int SetSchedulingPriority(); //FIXME: should be private
61	schoenebeck	392	virtual int LockMemory(); //FIXME: should be private
62	schoenebeck	53	virtual void EnableDestructor(); //FIXME: should be private
63			virtual int Destructor(); //FIXME: should be private
64			virtual int Main() = 0; ///< This method needs to be implemented by the descendant and is the entry point for the new thread. FIXME: should be protected
65	senoner	1481
66	schoenebeck	1482	/**
67			* Allocates an aligned block of memory. Allocated memory blocks
68			* need to be freed using freeAlignedMem().
69			*
70			* @param boundary - the alignement boundary, usually a power of 2
71			* e.g. 4 but it can be an arbitrary number
72			* between 1 and 128
73			* @param size - size in bytes to be allocated
74			* @returns pointer to the allocated memory block
75			*/
76	senoner	1481	static void* allocAlignedMem(size_t boundary, size_t size) {
77			unsigned char ptr = (unsigned char )malloc(size+boundary);
78			size_t offset = boundary - ((size_t)ptr % boundary);
79			ptr[offset-1] = (unsigned char)offset;
80			return (ptr + offset);
81			}
82
83	schoenebeck	1482	/**
84			* Frees an aligned block of memory allocated with allocAlignedMem()
85			*
86			* @param ptr - pointer to the memory block
87			*/
88	senoner	1481	static void freeAlignedMem(void *ptr) {
89			unsigned char p = (unsigned char )ptr;
90			p -= p[-1];
91			free(p);
92			}
93	schoenebeck	1482
94	senoner	1481	/**
95	schoenebeck	1482	* Locks a region of memory in physical RAM.
96			*
97			* @param addr - address of the memory block
98			* @param size - size of the memory block
99			* @return true if the locking succeded, otherwise false
100			*/
101	senoner	1481	static bool lockMemory(void *addr, size_t size) {
102			#if defined(WIN32)
103			return VirtualLock(addr, size);
104			#else
105			return !mlock(addr, size);
106			#endif
107			}
108	schoenebeck	1482
109	senoner	1481	/**
110	schoenebeck	1482	* Unlocks a region of memory in physical RAM.
111			*
112			* @param addr - address of the memory block
113			* @param size - size of the memory block
114			* @return true if the unlocking succeded, otherwise false
115			*/
116	senoner	1481	static bool unlockMemory(void *addr, size_t size) {
117			#if defined(WIN32)
118			return VirtualUnlock(addr, size);
119			#else
120			return !munlock(addr, size);
121			#endif
122			}
123	schoenebeck	1482
124	schoenebeck	53	private:
125	senoner	1481	#if defined(WIN32)
126			HANDLE hThread;
127			DWORD lpThreadId;
128			#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
129			bool win32isRunning;
130			#endif
131			#else
132	schoenebeck	1221	pthread_attr_t __thread_attr;
133	schoenebeck	53	pthread_t __thread_id;
134			pthread_key_t __thread_destructor_key;
135	senoner	1481	#endif
136	schoenebeck	1221	Condition RunningCondition;
137	schoenebeck	53	int PriorityMax;
138			int PriorityDelta;
139			bool isRealTime;
140	schoenebeck	392	bool bLockedMemory;
141	schoenebeck	53	};
142
143	schoenebeck	1212	} // namespace LinuxSampler
144
145	schoenebeck	1424	#endif // __LS_THREAD_H__