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) {
    pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL); // let the thread be killable under any circumstances
    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	schoenebeck	53	// Create and run the thread
154	schoenebeck	1221	res = pthread_create(&this->__thread_id, &__thread_attr, __pthread_launcher, this);
155	schoenebeck	53	switch (res) {
156			case 0: // Success
157			break;
158			case EAGAIN:
159			std::cerr << "Thread creation failed: System doesn't allow to create another thread."
160			<< std::endl << std::flush;
161	schoenebeck	1221	RunningCondition.Set(false);
162	schoenebeck	53	break;
163			case EPERM:
164			std::cerr << "Thread creation failed: You're lacking permisssions to set required scheduling policy and parameters."
165			<< std::endl << std::flush;
166	schoenebeck	1221	RunningCondition.Set(false);
167	schoenebeck	53	break;
168			default:
169			std::cerr << "Thread creation failed: Unknown cause."
170			<< std::endl << std::flush;
171	schoenebeck	1221	RunningCondition.Set(false);
172	schoenebeck	53	break;
173			}
174			return res;
175	senoner	1481	#endif
176	schoenebeck	53	}
177
178			/**
179			* Stops the thread. This method will wait until the thread actually stopped
180			* it's execution before it will return.
181			*/
182			int Thread::StopThread() {
183	senoner	1481	#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
184			SignalStopThread();
185			win32isRunning = false;
186			return 0;
187			#endif
188	schoenebeck	1221	RunningCondition.Lock();
189			if (RunningCondition.GetUnsafe()) {
190	schoenebeck	53	SignalStopThread();
191	schoenebeck	1221	// wait until thread stopped execution
192			RunningCondition.WaitIf(true);
193	senoner	1481	#if defined(WIN32)
194			#else
195	schoenebeck	351	pthread_detach(__thread_id);
196	senoner	1481	#endif
197	schoenebeck	53	}
198	schoenebeck	1221	RunningCondition.Unlock();
199	schoenebeck	53	return 0;
200			}
201
202			/**
203			* Stops the thread. This method will signal to stop the thread and return
204			* immediately. Note that the thread might still run when this method
205			* returns!
206	schoenebeck	57	*
207			* @see StopThread()
208	schoenebeck	53	*/
209			int Thread::SignalStopThread() {
210	schoenebeck	1221	//FIXME: segfaults when thread is not yet running
211	senoner	1481	#if defined(WIN32)
212			BOOL res;
213			res = TerminateThread(hThread, 0); // we set ExitCode to 0
214			//res = WaitForSingleObject( hThread, INFINITE);
215			//myprint(("Thread::SignalStopThread: WaitForSingleObject( hThread, INFINITE) res=%d\n",res));
216			#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
217			win32isRunning = false;
218			#else
219			RunningCondition.Set(false);
220			#endif
221			#else
222	schoenebeck	53	pthread_cancel(__thread_id);
223	senoner	1481	#endif
224	schoenebeck	53	return 0;
225			}
226
227			/**
228	schoenebeck	1212	* Returns @c true in case the thread is currently running.
229			*/
230			bool Thread::IsRunning() {
231	senoner	1481	#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
232			return win32isRunning;
233			#else
234	schoenebeck	1221	return RunningCondition.GetUnsafe();
235	senoner	1481	#endif
236	schoenebeck	1212	}
237
238			/**
239	schoenebeck	53	* Sets the process SCHED_FIFO policy, if max=1 then set at max priority,
240			* else use min priority. delta is added to the priority so that we can
241			* for example set 3 SCHED_FIFO tasks to different priorities by specifying
242			* delta 0 , -1 , -2 ( 0 = highest priority because -1 is subtracted to the
243			* current priority).
244			*/
245			int Thread::SetSchedulingPriority() {
246	senoner	1481	#if defined(WIN32)
247			DWORD dwPriorityClass;
248			int nPriority;
249
250			if(isRealTime) {
251			dwPriorityClass = REALTIME_PRIORITY_CLASS;
252			if (this->PriorityMax == 1) {
253			if(this->PriorityDelta == 0) nPriority = THREAD_PRIORITY_TIME_CRITICAL;
254			else nPriority = 7 + this->PriorityDelta;
255			}
256			else nPriority = THREAD_PRIORITY_NORMAL + this->PriorityDelta;
257			}
258			else {
259			dwPriorityClass = NORMAL_PRIORITY_CLASS;
260			nPriority = THREAD_PRIORITY_NORMAL + this->PriorityDelta;
261			}
262
263			BOOL res;
264			// FIXME: priority class (realtime) does not work yet, gives error. check why.
265			#if 0
266			res = SetPriorityClass( hThread, dwPriorityClass );
267			if(res == false) {
268			std::cerr << "Thread: WARNING, setPriorityClass " << dwPriorityClass << "failed. Error " << GetLastError() << "\n";
269			return -1;
270			}
271
272			res = SetThreadPriority( hThread, nPriority );
273			if(res == false) {
274			std::cerr << "Thread: WARNING, setThreadPriority " << nPriority << "failed. Error " << GetLastError() << "\n";
275			return -1;
276			}
277			#endif
278			return 0;
279			#else
280	schoenebeck	361	#if !defined(__APPLE__)
281	schoenebeck	1221	int policy;
282	persson	1222	const char* policyDescription = NULL;
283	schoenebeck	1221	if (isRealTime) { // becomes a RT thread
284			policy = SCHED_FIFO;
285			policyDescription = "realtime";
286			} else { // 'normal', non-RT thread
287			policy = SCHED_OTHER;
288			policyDescription = "normal (non-RT)";
289			}
290			// set selected scheduling policy and priority
291	schoenebeck	53	struct sched_param schp;
292			memset(&schp, 0, sizeof(schp));
293	persson	1222	if (isRealTime) { // it is not possible to change priority for the SCHED_OTHER policy
294			if (this->PriorityMax == 1) {
295			schp.sched_priority = sched_get_priority_max(policy) + this->PriorityDelta;
296			}
297			if (this->PriorityMax == -1) {
298			schp.sched_priority = sched_get_priority_min(policy) + this->PriorityDelta;
299			}
300	schoenebeck	53	}
301	schoenebeck	1221	if (pthread_setschedparam(__thread_id, policy, &schp) != 0) {
302			std::cerr << "Thread: WARNING, can't assign "
303			<< policyDescription
304			<< " scheduling to thread!"
305			<< std::endl << std::flush;
306	schoenebeck	53	return -1;
307			}
308	schoenebeck	361	#endif
309	schoenebeck	53	return 0;
310	senoner	1481	#endif
311	schoenebeck	53	}
312
313			/**
314	schoenebeck	392	* Locks the memory so it will not be swapped out by the operating system.
315			*/
316			int Thread::LockMemory() {
317	senoner	1481	#if defined(WIN32)
318			return 0;
319			#else
320	letz	399	#if !defined(__APPLE__)
321	schoenebeck	392	if (!bLockedMemory) return 0;
322			if (mlockall(MCL_CURRENT \| MCL_FUTURE) < 0) {
323	schoenebeck	1221	std::cerr << "Thread: WARNING, can't mlockall() memory!\n"
324			<< std::flush;
325	schoenebeck	392	return -1;
326			}
327	letz	399	#endif
328	schoenebeck	392	return 0;
329	senoner	1481	#endif
330	schoenebeck	392	}
331
332			/**
333	schoenebeck	53	* Registers thread destructor callback function which will be executed when
334			* the thread stops it's execution and sets the 'Running' flag to true. This
335			* method will be called by the __pthread_launcher callback function, DO NOT
336			* CALL THIS METHOD YOURSELF!
337			*/
338			void Thread::EnableDestructor() {
339	senoner	1481	#if defined(WIN32_SIGNALSTARTTHREAD_WORKAROUND)
340			win32isRunning = true;
341			return;
342			#endif
343	schoenebeck	1221	RunningCondition.Lock();
344	senoner	1481	#if defined(WIN32)
345			#else
346	schoenebeck	53	pthread_key_create(&__thread_destructor_key, __pthread_destructor);
347			pthread_setspecific(__thread_destructor_key, this);
348	senoner	1481	#endif
349	schoenebeck	1221	RunningCondition.Set(true);
350			RunningCondition.Unlock();
351	schoenebeck	53	}
352
353			/**
354			* Will be called by the kernel when the thread stops it's execution.
355			*/
356			int Thread::Destructor() {
357	senoner	1481	#if defined(WIN32)
358			#else
359	schoenebeck	53	pthread_key_delete(__thread_destructor_key);
360	schoenebeck	1221	RunningCondition.Set(false);
361	senoner	1481	#endif
362	persson	497	return 0;
363	schoenebeck	53	}
364
365	senoner	1481	#if defined(WIN32)
366			DWORD WINAPI __win32thread_launcher(LPVOID lpParameter) {
367			Thread* t;
368			t = (Thread*) lpParameter;
369			t->SetSchedulingPriority();
370			t->LockMemory();
371			t->EnableDestructor();
372			t->Main();
373			return 0;
374			}
375			#else
376	schoenebeck	53	/// Callback function for the POSIX thread API
377	schoenebeck	1424	static void* __pthread_launcher(void* thread) {
378	schoenebeck	63	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL); // let the thread be killable under any circumstances
379	schoenebeck	53	Thread* t;
380			t = (Thread*) thread;
381	schoenebeck	57	t->SetSchedulingPriority();
382	schoenebeck	392	t->LockMemory();
383	schoenebeck	53	t->EnableDestructor();
384			t->Main();
385	persson	497	return NULL;
386	schoenebeck	53	}
387	senoner	1481	#endif
388	schoenebeck	53
389	senoner	1481	#if defined(WIN32)
390			#else
391	schoenebeck	53	/// Callback function for the POSIX thread API
392	schoenebeck	1424	static void __pthread_destructor(void* thread) {
393	schoenebeck	53	Thread* t;
394			t = (Thread*) thread;
395			t->Destructor();
396			}
397	senoner	1481	#endif
398	schoenebeck	1212
399			} // namespace LinuxSampler