src/common/Thread.cpp

/***************************************************************************
 *                                                                         *
 *   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                                                   *
 ***************************************************************************/

#include "Thread.h"

// this is the minimum stack size a thread will be spawned with
// if this value is too small, the OS will allocate memory on demand and
// thus might lead to dropouts in realtime threads
// TODO: should be up for testing to get a reasonable good value
#define MIN_STACK_SIZE          524288

namespace LinuxSampler {

#if defined(WIN32)
// Callback functions for the WIN32 thread API
DWORD WINAPI __win32thread_launcher(LPVOID lpParameter);
#else
// Callback functions for the POSIX thread API
static void* __pthread_launcher(void* thread);
static void  __pthread_destructor(void* thread);
#endif

Thread::Thread(bool LockMemory, bool RealTime, int PriorityMax, int PriorityDelta) {
    this->bLockedMemory     = LockMemory;
    this->isRealTime        = RealTime;
    this->PriorityDelta     = PriorityDelta;
    this->PriorityMax       = PriorityMax;
#if defined(WIN32)
#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
    win32isRunning = false;
#endif
#else
    __thread_destructor_key = 0;
    pthread_attr_init(&__thread_attr);
#endif
}

Thread::~Thread() {
    StopThread();
#if defined(WIN32)
#else
    pthread_attr_destroy(&__thread_attr);
#endif
}

/**
 *  Starts the thread. This method will wait until the thread actually
 *  started it's execution before it will return. The abstract method
 *  Main() is the entry point for the new thread. You have to implement the
 *  Main() method in your subclass.
 */
int Thread::StartThread() {
#if defined (WIN32_SIGNALSTARTTHREAD_WORKAROUND)
    // poll the win32isRunning variable and sleep 1msec inbetween
    if(!win32isRunning) {
        SignalStartThread();
        while(1) {
            Sleep(1);
            if(win32isRunning) break;
        }
    }
    return 0;
#else
    RunningCondition.Lock();
    if (!RunningCondition.GetUnsafe()) {
        SignalStartThread();
        // wait until thread started execution
        RunningCondition.WaitIf(false);
    }
    RunningCondition.Unlock();
    return 0;
#endif
}

/**
 *  Starts the thread. This method will signal to start the thread and
 *  return immediately. Note that the thread might not yet run when this
 *  method returns! The abstract method Main() is the entry point for the
 *  new thread. You have to implement the Main() method in your subclass.
 *
 *  @see StartThread()
 */
int Thread::SignalStartThread() {
#if defined(WIN32)
    LPVOID lpParameter;
    hThread = CreateThread(
               NULL, // no security attributes
               MIN_STACK_SIZE,
               __win32thread_launcher,
               this,
               0,
               &lpThreadId);
    if(hThread == NULL) {
        std::cerr << "Thread creation failed: Error" << GetLastError() << std::endl << std::flush;
        #if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
        win32isRunning = false;
        #else
        RunningCondition.Set(false);
        #endif
        return -1;
    }
    return 0;
#else
    // prepare the thread properties
    int res = pthread_attr_setinheritsched(&__thread_attr, PTHREAD_EXPLICIT_SCHED);
    if (res) {
        std::cerr << "Thread creation failed: Could not inherit thread properties."
                  << std::endl << std::flush;
        RunningCondition.Set(false);
        return res;
    }
    res = pthread_attr_setdetachstate(&__thread_attr, PTHREAD_CREATE_JOINABLE);
    if (res) {
        std::cerr << "Thread creation failed: Could not request a joinable thread."
                  << std::endl << std::flush;
        RunningCondition.Set(false);
        return res;
    }
    res = pthread_attr_setscope(&__thread_attr, PTHREAD_SCOPE_SYSTEM);
    if (res) {
        std::cerr << "Thread creation failed: Could not request system scope for thread scheduling."
                  << std::endl << std::flush;
        RunningCondition.Set(false);
        return res;
    }
    res = pthread_attr_setstacksize(&__thread_attr, MIN_STACK_SIZE);
    if (res) {
        std::cerr << "Thread creation failed: Could not set minimum stack size."
                  << std::endl << std::flush;
        RunningCondition.Set(false);
        return res;
    }

    // Create and run the thread
    res = pthread_create(&this->__thread_id, &__thread_attr, __pthread_launcher, this);
    switch (res) {
        case 0: // Success
            break;
        case EAGAIN:
            std::cerr << "Thread creation failed: System doesn't allow to create another thread."
                      << std::endl << std::flush;
            RunningCondition.Set(false);
            break;
        case EPERM:
            std::cerr << "Thread creation failed: You're lacking permisssions to set required scheduling policy and parameters."
                      << std::endl << std::flush;
            RunningCondition.Set(false);
            break;
        default:
            std::cerr << "Thread creation failed: Unknown cause."
                      << std::endl << std::flush;
            RunningCondition.Set(false);
            break;
    }
    return res;
#endif
}

/**
 *  Stops the thread. This method will wait until the thread actually stopped
 *  it's execution before it will return.
 */
int Thread::StopThread() {
#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
    SignalStopThread();
    win32isRunning = false;
    return 0;
#endif
    RunningCondition.Lock();
    if (RunningCondition.GetUnsafe()) {
        SignalStopThread();
        // wait until thread stopped execution
        RunningCondition.WaitIf(true);
        #if defined(WIN32)
        #else           
        pthread_detach(__thread_id);
        #endif          
    }
    RunningCondition.Unlock();
    return 0;
}

/**
 *  Stops the thread. This method will signal to stop the thread and return
 *  immediately. Note that the thread might still run when this method
 *  returns!
 *
 *  @see StopThread()
 */
int Thread::SignalStopThread() {
    //FIXME: segfaults when thread is not yet running
#if defined(WIN32)
    BOOL res;
    res = TerminateThread(hThread, 0); // we set ExitCode to 0
    //res = WaitForSingleObject( hThread, INFINITE);
    //myprint(("Thread::SignalStopThread:  WaitForSingleObject( hThread, INFINITE) res=%d\n",res));
    #if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
    win32isRunning = false;
    #else
    RunningCondition.Set(false);
    #endif
#else
    pthread_cancel(__thread_id);
#endif  
    return 0;
}

/**
 * Returns @c true in case the thread is currently running.
 */
bool Thread::IsRunning() {
    #if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
    return win32isRunning;
    #else
    return RunningCondition.GetUnsafe();
    #endif
}

/**
 *  Sets the process SCHED_FIFO policy,  if max=1 then set at max priority,
 *  else use min priority. delta is added to the priority so that we can
 *  for example set 3 SCHED_FIFO tasks to different priorities by specifying
 *  delta  0 , -1 , -2  ( 0 = highest priority because -1 is subtracted to the
 *  current priority).
 */
int Thread::SetSchedulingPriority() {
#if defined(WIN32)
    DWORD dwPriorityClass;
    int nPriority;

    if(isRealTime) {
        dwPriorityClass = REALTIME_PRIORITY_CLASS;
        if (this->PriorityMax == 1) {
            if(this->PriorityDelta == 0) nPriority = THREAD_PRIORITY_TIME_CRITICAL;
            else nPriority = 7 + this->PriorityDelta;
        }
        else nPriority = THREAD_PRIORITY_NORMAL + this->PriorityDelta;
    }
    else {
        dwPriorityClass = NORMAL_PRIORITY_CLASS;
        nPriority = THREAD_PRIORITY_NORMAL + this->PriorityDelta;
    }

    BOOL res;
    // FIXME: priority class (realtime) does not work yet, gives error. check why.
    #if 0
    res = SetPriorityClass( hThread, dwPriorityClass );
    if(res == false) {
        std::cerr << "Thread: WARNING, setPriorityClass " << dwPriorityClass << "failed. Error " << GetLastError() << "\n";
        return -1;
    }

    res = SetThreadPriority( hThread, nPriority );
    if(res == false) {
        std::cerr << "Thread: WARNING, setThreadPriority " << nPriority << "failed. Error " << GetLastError() << "\n";
        return -1;
    }
    #endif
    return 0;
#else
#if !defined(__APPLE__)
    int policy;
    const char* policyDescription = NULL;
    if (isRealTime) { // becomes a RT thread
        policy = SCHED_FIFO;
        policyDescription = "realtime";
    } else { // 'normal', non-RT thread
        policy = SCHED_OTHER;
        policyDescription = "normal (non-RT)";
    }
    // set selected scheduling policy and priority
    struct sched_param schp;
    memset(&schp, 0, sizeof(schp));
    if (isRealTime) { // it is not possible to change priority for the SCHED_OTHER policy
        if (this->PriorityMax == 1) {
            schp.sched_priority = sched_get_priority_max(policy) + this->PriorityDelta;
        }
        if (this->PriorityMax == -1) {
            schp.sched_priority = sched_get_priority_min(policy) + this->PriorityDelta;
        }
    }
    if (pthread_setschedparam(__thread_id, policy, &schp) != 0) {
        std::cerr << "Thread: WARNING, can't assign "
                  << policyDescription
                  << " scheduling to thread!"
                  << std::endl << std::flush;
        return -1;
    }
#endif
    return 0;
#endif  
}

/**
 * Locks the memory so it will not be swapped out by the operating system.
 */
int Thread::LockMemory() {
#if defined(WIN32)
    return 0;
#else
#if !defined(__APPLE__)
    if (!bLockedMemory) return 0;
    if (mlockall(MCL_CURRENT | MCL_FUTURE) < 0) {
        std::cerr << "Thread: WARNING, can't mlockall() memory!\n"
                  << std::flush;
        return -1;
    }
#endif
    return 0;
#endif  
}

/**
 *  Registers thread destructor callback function which will be executed when
 *  the thread stops it's execution and sets the 'Running' flag to true. This
 *  method will be called by the __pthread_launcher callback function, DO NOT
 *  CALL THIS METHOD YOURSELF!
 */
void Thread::EnableDestructor() {
#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
    win32isRunning = true;
    return;     
#endif
    RunningCondition.Lock();
#if defined(WIN32)
#else   
    pthread_key_create(&__thread_destructor_key, __pthread_destructor);
    pthread_setspecific(__thread_destructor_key, this);
#endif  
    RunningCondition.Set(true);
    RunningCondition.Unlock();
}

/**
 *  Will be called by the kernel when the thread stops it's execution.
 */
int Thread::Destructor() {
#if defined(WIN32)
#else
    pthread_key_delete(__thread_destructor_key);
    RunningCondition.Set(false);
#endif  
    return 0;
}

#if defined(WIN32)
DWORD WINAPI __win32thread_launcher(LPVOID lpParameter) {
    Thread* t;
    t = (Thread*) lpParameter;
    t->SetSchedulingPriority();
    t->LockMemory();
    t->EnableDestructor();
    t->Main();
    return 0;
}
#else
/// Callback function for the POSIX thread API
static void* __pthread_launcher(void* thread) {
#if !CONFIG_PTHREAD_TESTCANCEL
    pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL); // let the thread be killable under any circumstances
#endif

    Thread* t;
    t = (Thread*) thread;
    t->SetSchedulingPriority();
    t->LockMemory();
    t->EnableDestructor();
    t->Main();
    return NULL;
}
#endif

#if defined(WIN32)
#else
/// Callback function for the POSIX thread API
static void __pthread_destructor(void* thread) {
    Thread* t;
    t = (Thread*) thread;
    t->Destructor();
}
#endif

} // namespace LinuxSampler
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			#include "Thread.h"
25
26	schoenebeck	1221	// this is the minimum stack size a thread will be spawned with
27			// if this value is too small, the OS will allocate memory on demand and
28			// thus might lead to dropouts in realtime threads
29			// TODO: should be up for testing to get a reasonable good value
30			#define MIN_STACK_SIZE 524288
31
32	schoenebeck	1212	namespace LinuxSampler {
33
34	senoner	1481	#if defined(WIN32)
35			// Callback functions for the WIN32 thread API
36			DWORD WINAPI __win32thread_launcher(LPVOID lpParameter);
37			#else
38	schoenebeck	1424	// Callback functions for the POSIX thread API
39			static void* __pthread_launcher(void* thread);
40			static void __pthread_destructor(void* thread);
41	senoner	1481	#endif
42	schoenebeck	1424
43	schoenebeck	392	Thread::Thread(bool LockMemory, bool RealTime, int PriorityMax, int PriorityDelta) {
44			this->bLockedMemory = LockMemory;
45	schoenebeck	53	this->isRealTime = RealTime;
46			this->PriorityDelta = PriorityDelta;
47			this->PriorityMax = PriorityMax;
48	senoner	1481	#if defined(WIN32)
49			#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
50			win32isRunning = false;
51			#endif
52			#else
53	schoenebeck	53	__thread_destructor_key = 0;
54	schoenebeck	1221	pthread_attr_init(&__thread_attr);
55	senoner	1481	#endif
56	schoenebeck	53	}
57
58			Thread::~Thread() {
59	schoenebeck	57	StopThread();
60	senoner	1481	#if defined(WIN32)
61			#else
62	schoenebeck	1221	pthread_attr_destroy(&__thread_attr);
63	senoner	1481	#endif
64	schoenebeck	53	}
65
66			/**
67	schoenebeck	57	* Starts the thread. This method will wait until the thread actually
68			* started it's execution before it will return. The abstract method
69			* Main() is the entry point for the new thread. You have to implement the
70			* Main() method in your subclass.
71	schoenebeck	53	*/
72			int Thread::StartThread() {
73	senoner	1481	#if defined (WIN32_SIGNALSTARTTHREAD_WORKAROUND)
74			// poll the win32isRunning variable and sleep 1msec inbetween
75			if(!win32isRunning) {
76			SignalStartThread();
77			while(1) {
78			Sleep(1);
79			if(win32isRunning) break;
80			}
81			}
82			return 0;
83			#else
84	schoenebeck	1221	RunningCondition.Lock();
85			if (!RunningCondition.GetUnsafe()) {
86	schoenebeck	57	SignalStartThread();
87	schoenebeck	1221	// wait until thread started execution
88			RunningCondition.WaitIf(false);
89	schoenebeck	57	}
90	schoenebeck	1221	RunningCondition.Unlock();
91	schoenebeck	57	return 0;
92	senoner	1481	#endif
93	schoenebeck	57	}
94
95			/**
96			* Starts the thread. This method will signal to start the thread and
97			* return immediately. Note that the thread might not yet run when this
98			* method returns! The abstract method Main() is the entry point for the
99			* new thread. You have to implement the Main() method in your subclass.
100			*
101			* @see StartThread()
102			*/
103			int Thread::SignalStartThread() {
104	senoner	1481	#if defined(WIN32)
105			LPVOID lpParameter;
106			hThread = CreateThread(
107			NULL, // no security attributes
108			MIN_STACK_SIZE,
109			__win32thread_launcher,
110			this,
111			0,
112			&lpThreadId);
113			if(hThread == NULL) {
114			std::cerr << "Thread creation failed: Error" << GetLastError() << std::endl << std::flush;
115			#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
116			win32isRunning = false;
117			#else
118			RunningCondition.Set(false);
119			#endif
120			return -1;
121			}
122			return 0;
123			#else
124	schoenebeck	1221	// prepare the thread properties
125			int res = pthread_attr_setinheritsched(&__thread_attr, PTHREAD_EXPLICIT_SCHED);
126			if (res) {
127			std::cerr << "Thread creation failed: Could not inherit thread properties."
128			<< std::endl << std::flush;
129			RunningCondition.Set(false);
130			return res;
131			}
132			res = pthread_attr_setdetachstate(&__thread_attr, PTHREAD_CREATE_JOINABLE);
133			if (res) {
134			std::cerr << "Thread creation failed: Could not request a joinable thread."
135			<< std::endl << std::flush;
136			RunningCondition.Set(false);
137			return res;
138			}
139			res = pthread_attr_setscope(&__thread_attr, PTHREAD_SCOPE_SYSTEM);
140			if (res) {
141			std::cerr << "Thread creation failed: Could not request system scope for thread scheduling."
142			<< std::endl << std::flush;
143			RunningCondition.Set(false);
144			return res;
145			}
146			res = pthread_attr_setstacksize(&__thread_attr, MIN_STACK_SIZE);
147			if (res) {
148			std::cerr << "Thread creation failed: Could not set minimum stack size."
149			<< std::endl << std::flush;
150			RunningCondition.Set(false);
151			return res;
152			}
153	nagata	1649
154	schoenebeck	53	// Create and run the thread
155	schoenebeck	1221	res = pthread_create(&this->__thread_id, &__thread_attr, __pthread_launcher, this);
156	schoenebeck	53	switch (res) {
157			case 0: // Success
158			break;
159			case EAGAIN:
160			std::cerr << "Thread creation failed: System doesn't allow to create another thread."
161			<< std::endl << std::flush;
162	schoenebeck	1221	RunningCondition.Set(false);
163	schoenebeck	53	break;
164			case EPERM:
165			std::cerr << "Thread creation failed: You're lacking permisssions to set required scheduling policy and parameters."
166			<< std::endl << std::flush;
167	schoenebeck	1221	RunningCondition.Set(false);
168	schoenebeck	53	break;
169			default:
170			std::cerr << "Thread creation failed: Unknown cause."
171			<< std::endl << std::flush;
172	schoenebeck	1221	RunningCondition.Set(false);
173	schoenebeck	53	break;
174			}
175			return res;
176	senoner	1481	#endif
177	schoenebeck	53	}
178
179			/**
180			* Stops the thread. This method will wait until the thread actually stopped
181			* it's execution before it will return.
182			*/
183			int Thread::StopThread() {
184	senoner	1481	#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
185			SignalStopThread();
186			win32isRunning = false;
187			return 0;
188			#endif
189	schoenebeck	1221	RunningCondition.Lock();
190			if (RunningCondition.GetUnsafe()) {
191	schoenebeck	53	SignalStopThread();
192	schoenebeck	1221	// wait until thread stopped execution
193			RunningCondition.WaitIf(true);
194	senoner	1481	#if defined(WIN32)
195			#else
196	schoenebeck	351	pthread_detach(__thread_id);
197	senoner	1481	#endif
198	schoenebeck	53	}
199	schoenebeck	1221	RunningCondition.Unlock();
200	schoenebeck	53	return 0;
201			}
202
203			/**
204			* Stops the thread. This method will signal to stop the thread and return
205			* immediately. Note that the thread might still run when this method
206			* returns!
207	schoenebeck	57	*
208			* @see StopThread()
209	schoenebeck	53	*/
210			int Thread::SignalStopThread() {
211	schoenebeck	1221	//FIXME: segfaults when thread is not yet running
212	senoner	1481	#if defined(WIN32)
213			BOOL res;
214			res = TerminateThread(hThread, 0); // we set ExitCode to 0
215			//res = WaitForSingleObject( hThread, INFINITE);
216			//myprint(("Thread::SignalStopThread: WaitForSingleObject( hThread, INFINITE) res=%d\n",res));
217			#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
218			win32isRunning = false;
219			#else
220			RunningCondition.Set(false);
221			#endif
222	nagata	1649	#else
223	schoenebeck	53	pthread_cancel(__thread_id);
224	senoner	1481	#endif
225	schoenebeck	53	return 0;
226			}
227
228			/**
229	schoenebeck	1212	* Returns @c true in case the thread is currently running.
230			*/
231			bool Thread::IsRunning() {
232	senoner	1481	#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
233			return win32isRunning;
234			#else
235	schoenebeck	1221	return RunningCondition.GetUnsafe();
236	senoner	1481	#endif
237	schoenebeck	1212	}
238
239			/**
240	schoenebeck	53	* Sets the process SCHED_FIFO policy, if max=1 then set at max priority,
241			* else use min priority. delta is added to the priority so that we can
242			* for example set 3 SCHED_FIFO tasks to different priorities by specifying
243			* delta 0 , -1 , -2 ( 0 = highest priority because -1 is subtracted to the
244			* current priority).
245			*/
246			int Thread::SetSchedulingPriority() {
247	senoner	1481	#if defined(WIN32)
248			DWORD dwPriorityClass;
249			int nPriority;
250
251			if(isRealTime) {
252			dwPriorityClass = REALTIME_PRIORITY_CLASS;
253			if (this->PriorityMax == 1) {
254			if(this->PriorityDelta == 0) nPriority = THREAD_PRIORITY_TIME_CRITICAL;
255			else nPriority = 7 + this->PriorityDelta;
256			}
257			else nPriority = THREAD_PRIORITY_NORMAL + this->PriorityDelta;
258			}
259			else {
260			dwPriorityClass = NORMAL_PRIORITY_CLASS;
261			nPriority = THREAD_PRIORITY_NORMAL + this->PriorityDelta;
262			}
263
264			BOOL res;
265			// FIXME: priority class (realtime) does not work yet, gives error. check why.
266			#if 0
267			res = SetPriorityClass( hThread, dwPriorityClass );
268			if(res == false) {
269			std::cerr << "Thread: WARNING, setPriorityClass " << dwPriorityClass << "failed. Error " << GetLastError() << "\n";
270			return -1;
271			}
272
273			res = SetThreadPriority( hThread, nPriority );
274			if(res == false) {
275			std::cerr << "Thread: WARNING, setThreadPriority " << nPriority << "failed. Error " << GetLastError() << "\n";
276			return -1;
277			}
278			#endif
279			return 0;
280			#else
281	schoenebeck	361	#if !defined(__APPLE__)
282	schoenebeck	1221	int policy;
283	persson	1222	const char* policyDescription = NULL;
284	schoenebeck	1221	if (isRealTime) { // becomes a RT thread
285			policy = SCHED_FIFO;
286			policyDescription = "realtime";
287			} else { // 'normal', non-RT thread
288			policy = SCHED_OTHER;
289			policyDescription = "normal (non-RT)";
290			}
291			// set selected scheduling policy and priority
292	schoenebeck	53	struct sched_param schp;
293			memset(&schp, 0, sizeof(schp));
294	persson	1222	if (isRealTime) { // it is not possible to change priority for the SCHED_OTHER policy
295			if (this->PriorityMax == 1) {
296			schp.sched_priority = sched_get_priority_max(policy) + this->PriorityDelta;
297			}
298			if (this->PriorityMax == -1) {
299			schp.sched_priority = sched_get_priority_min(policy) + this->PriorityDelta;
300			}
301	schoenebeck	53	}
302	schoenebeck	1221	if (pthread_setschedparam(__thread_id, policy, &schp) != 0) {
303			std::cerr << "Thread: WARNING, can't assign "
304			<< policyDescription
305			<< " scheduling to thread!"
306			<< std::endl << std::flush;
307	schoenebeck	53	return -1;
308			}
309	schoenebeck	361	#endif
310	schoenebeck	53	return 0;
311	senoner	1481	#endif
312	schoenebeck	53	}
313
314			/**
315	schoenebeck	392	* Locks the memory so it will not be swapped out by the operating system.
316			*/
317			int Thread::LockMemory() {
318	senoner	1481	#if defined(WIN32)
319			return 0;
320			#else
321	letz	399	#if !defined(__APPLE__)
322	schoenebeck	392	if (!bLockedMemory) return 0;
323			if (mlockall(MCL_CURRENT \| MCL_FUTURE) < 0) {
324	schoenebeck	1221	std::cerr << "Thread: WARNING, can't mlockall() memory!\n"
325			<< std::flush;
326	schoenebeck	392	return -1;
327			}
328	letz	399	#endif
329	schoenebeck	392	return 0;
330	senoner	1481	#endif
331	schoenebeck	392	}
332
333			/**
334	schoenebeck	53	* Registers thread destructor callback function which will be executed when
335			* the thread stops it's execution and sets the 'Running' flag to true. This
336			* method will be called by the __pthread_launcher callback function, DO NOT
337			* CALL THIS METHOD YOURSELF!
338			*/
339			void Thread::EnableDestructor() {
340	senoner	1481	#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
341			win32isRunning = true;
342			return;
343			#endif
344	schoenebeck	1221	RunningCondition.Lock();
345	senoner	1481	#if defined(WIN32)
346			#else
347	schoenebeck	53	pthread_key_create(&__thread_destructor_key, __pthread_destructor);
348			pthread_setspecific(__thread_destructor_key, this);
349	senoner	1481	#endif
350	schoenebeck	1221	RunningCondition.Set(true);
351			RunningCondition.Unlock();
352	schoenebeck	53	}
353
354			/**
355			* Will be called by the kernel when the thread stops it's execution.
356			*/
357			int Thread::Destructor() {
358	senoner	1481	#if defined(WIN32)
359			#else
360	schoenebeck	53	pthread_key_delete(__thread_destructor_key);
361	schoenebeck	1221	RunningCondition.Set(false);
362	senoner	1481	#endif
363	persson	497	return 0;
364	schoenebeck	53	}
365
366	senoner	1481	#if defined(WIN32)
367			DWORD WINAPI __win32thread_launcher(LPVOID lpParameter) {
368			Thread* t;
369			t = (Thread*) lpParameter;
370			t->SetSchedulingPriority();
371			t->LockMemory();
372			t->EnableDestructor();
373			t->Main();
374			return 0;
375			}
376			#else
377	schoenebeck	53	/// Callback function for the POSIX thread API
378	schoenebeck	1424	static void* __pthread_launcher(void* thread) {
379	nagata	1649	#if !CONFIG_PTHREAD_TESTCANCEL
380	schoenebeck	63	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL); // let the thread be killable under any circumstances
381	nagata	1649	#endif
382
383	schoenebeck	53	Thread* t;
384			t = (Thread*) thread;
385	schoenebeck	57	t->SetSchedulingPriority();
386	schoenebeck	392	t->LockMemory();
387	schoenebeck	53	t->EnableDestructor();
388			t->Main();
389	persson	497	return NULL;
390	schoenebeck	53	}
391	senoner	1481	#endif
392	schoenebeck	53
393	senoner	1481	#if defined(WIN32)
394			#else
395	schoenebeck	53	/// Callback function for the POSIX thread API
396	schoenebeck	1424	static void __pthread_destructor(void* thread) {
397	schoenebeck	53	Thread* t;
398			t = (Thread*) thread;
399			t->Destructor();
400			}
401	senoner	1481	#endif
402	schoenebeck	1212
403			} // namespace LinuxSampler