/[svn]/linuxsampler/tags/start/thread.cpp
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Contents of /linuxsampler/tags/start/thread.cpp

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Revision 6 - (show annotations) (download)
Sat Oct 25 20:24:32 2003 UTC (20 years, 5 months ago) by (unknown author)
File size: 4147 byte(s)
This commit was manufactured by cvs2svn to create tag 'start'.
1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck *
6 * *
7 * This program is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU General Public License as published by *
9 * the Free Software Foundation; either version 2 of the License, or *
10 * (at your option) any later version. *
11 * *
12 * This program is distributed in the hope that it will be useful, *
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15 * GNU General Public License for more details. *
16 * *
17 * You should have received a copy of the GNU General Public License *
18 * along with this program; if not, write to the Free Software *
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20 * MA 02111-1307 USA *
21 ***************************************************************************/
22
23 #include "thread.h"
24
25 Thread::Thread(bool RealTime, int PriorityMax, int PriorityDelta) {
26 this->isRealTime=RealTime;
27 this->Running = false;
28 this->PriorityDelta = PriorityDelta;
29 this->PriorityMax = PriorityMax;
30 }
31
32 Thread::~Thread() {
33 if (this->Running) StopThread();
34 }
35
36 int Thread::StartThread() {
37 // Create and run the thread
38 this->Running = true;
39 int res = pthread_create(&this->__thread_id, NULL, __pthread_launcher, this);
40 switch (res) {
41 case 0: // Success
42 break;
43 case EAGAIN:
44 std::cerr << "Thread creation failed: System doesn't allow to create another thread."
45 << std::endl << std::flush;
46 this->Running = false;
47 break;
48 case EPERM:
49 std::cerr << "Thread creation failed: You're lacking permisssions to set required scheduling policy and parameters."
50 << std::endl << std::flush;
51 this->Running = false;
52 break;
53 default:
54 std::cerr << "Thread creation failed: Unknown cause."
55 << std::endl << std::flush;
56 this->Running = false;
57 break;
58 }
59 return res;
60 }
61
62 int Thread::StopThread() {
63 pthread_cancel(__thread_id);
64 Running = false;
65 return 0;
66 }
67
68 /**
69 * Sets the process SCHED_FIFO policy, if max=1 then set at max priority,
70 * else use min priority. delta is added to the priority so that we can
71 * for example set 3 SCHED_FIFO tasks to different priorities by specifying
72 * delta 0 , -1 , -2 ( 0 = highest priority because -1 is subtracted to the
73 * current priority).
74 */
75 int Thread::SetSchedulingPriority() {
76 struct sched_param schp;
77
78 if (mlockall(MCL_CURRENT | MCL_FUTURE) < 0) {
79 perror("WARNING, can't mlockall() memory!");
80 }
81
82 if(!isRealTime) return 0;
83
84 /*
85 * set the process to realtime privs
86 */
87 memset(&schp, 0, sizeof(schp));
88 if (this->PriorityMax == 1) {
89 schp.sched_priority = sched_get_priority_max(SCHED_FIFO) + this->PriorityDelta;
90 }
91 if (this->PriorityMax == -1) {
92 schp.sched_priority = sched_get_priority_min(SCHED_FIFO) + this->PriorityDelta;
93 }
94
95 if (sched_setscheduler(0, SCHED_FIFO, &schp) != 0) {
96 perror("sched_setscheduler");
97 return -1;
98 }
99
100 return 0;
101 }
102
103 /// Callback function for the POSIX thread API
104 void* __pthread_launcher(void* thread) {
105 Thread* t;
106 t = (Thread*) thread;
107 t->SetSchedulingPriority();
108 t->Main();
109 };

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