src/common/Condition.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 <sys/time.h>

#include "Condition.h"

#include "global.h"

namespace LinuxSampler {

Condition::Condition(bool bInitialCondition) {
    pthread_cond_init(&__posix_true_condition, NULL);
    pthread_cond_init(&__posix_false_condition, NULL);
    bCondition = bInitialCondition;
}

Condition::~Condition() {
    pthread_cond_destroy(&__posix_true_condition);
    pthread_cond_destroy(&__posix_false_condition);
}

int Condition::WaitIf(bool bCondition, long TimeoutSeconds, long TimeoutNanoSeconds) {
    dmsg(7,("Condition::Waitif() -> LOCK()\n"));
    Lock();
    dmsg(7,("Condition::Waitif() -> LOCK() passed\n"));
    int res = 0;
    if (this->bCondition == bCondition) {
        if (bCondition) { // wait until condition turned 'false'
            if (TimeoutSeconds || TimeoutNanoSeconds) { // wait with timeout
                struct timeval now;
                gettimeofday(&now, 0);
                timespec timeout;
                timeout.tv_sec  = now.tv_sec + TimeoutSeconds;
                timeout.tv_nsec = now.tv_usec * 1000 + TimeoutNanoSeconds;
                dmsg(7,("Condition::Waitif() -> waiting for 'false' condition with timeout\n"));
                res = pthread_cond_timedwait(&__posix_false_condition, &__posix_mutex, &timeout);
                dmsg(7,("Condition::Waitif() -> awakened from 'false' condition waiting\n"));
            }
            else { // wait without timeout
                dmsg(7,("Condition::Waitif() -> waiting for 'false' condition\n"));
                pthread_cond_wait(&__posix_false_condition, &__posix_mutex);
                dmsg(7,("Condition::Waitif() -> awakened from 'false' condition waiting\n"));
            }
        }
        else { // wait until condition turned 'true'
            if (TimeoutSeconds || TimeoutNanoSeconds) { // wait with timeout
                struct timeval now;
                gettimeofday(&now, 0);
                timespec timeout;
                timeout.tv_sec  = now.tv_sec + TimeoutSeconds;
                timeout.tv_nsec = now.tv_usec * 1000 + TimeoutNanoSeconds;
                dmsg(7,("Condition::Waitif() -> waiting for 'true' condition with timeout\n"));
                res = pthread_cond_timedwait(&__posix_true_condition, &__posix_mutex, &timeout);
                dmsg(7,("Condition::Waitif() -> awakened from 'true' condition waiting\n"));
            }
            else { // wait without timeout
                dmsg(7,("Condition::Waitif() -> waiting for 'true' condition\n"));
                pthread_cond_wait(&__posix_true_condition, &__posix_mutex);
                dmsg(7,("Condition::Waitif() -> awakened from 'true' condition waiting\n"));
            }
        }
    }
    return res;
}

int Condition::WaitAndUnlockIf(bool bCondition, long TimeoutSeconds, long TimeoutNanoSeconds) {
    int res = WaitIf(bCondition, TimeoutSeconds, TimeoutNanoSeconds);
    dmsg(7,("Condition::WaitAndUnlockIf() -> UNLOCK()\n"));
    Unlock();
    dmsg(7,("Condition::WaitAndUnlockIf() -> UNLOCK() passed\n"));
    return res;
}

void Condition::Set(bool bCondition) {
    dmsg(7,("Condition::Set() -> LOCK()\n"));
    Lock();
    dmsg(7,("Condition::Set() -> LOCK() passed\n"));
    if (this->bCondition != bCondition) {
        this->bCondition = bCondition;
        if (bCondition) {
            dmsg(7,("Condition::Set() -> broadcasting 'true' condition\n"));
            pthread_cond_broadcast(&__posix_true_condition);
        }
        else {
            dmsg(7,("Condition::Set() -> broadcasting 'false' condition\n"));
            pthread_cond_broadcast(&__posix_false_condition);
        }
    }
    Unlock();
}

bool Condition::GetUnsafe() {
    return bCondition;
}

} // namespace LinuxSampler
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 - 2007 Christian Schoenebeck *
7	* *
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 <sys/time.h>
25
26	#include "Condition.h"
27
28	#include "global.h"
29
30	namespace LinuxSampler {
31
32	Condition::Condition(bool bInitialCondition) {
33	pthread_cond_init(&__posix_true_condition, NULL);
34	pthread_cond_init(&__posix_false_condition, NULL);
35	bCondition = bInitialCondition;
36	}
37
38	Condition::~Condition() {
39	pthread_cond_destroy(&__posix_true_condition);
40	pthread_cond_destroy(&__posix_false_condition);
41	}
42
43	int Condition::WaitIf(bool bCondition, long TimeoutSeconds, long TimeoutNanoSeconds) {
44	dmsg(7,("Condition::Waitif() -> LOCK()\n"));
45	Lock();
46	dmsg(7,("Condition::Waitif() -> LOCK() passed\n"));
47	int res = 0;
48	if (this->bCondition == bCondition) {
49	if (bCondition) { // wait until condition turned 'false'
50	if (TimeoutSeconds \|\| TimeoutNanoSeconds) { // wait with timeout
51	struct timeval now;
52	gettimeofday(&now, 0);
53	timespec timeout;
54	timeout.tv_sec = now.tv_sec + TimeoutSeconds;
55	timeout.tv_nsec = now.tv_usec * 1000 + TimeoutNanoSeconds;
56	dmsg(7,("Condition::Waitif() -> waiting for 'false' condition with timeout\n"));
57	res = pthread_cond_timedwait(&__posix_false_condition, &__posix_mutex, &timeout);
58	dmsg(7,("Condition::Waitif() -> awakened from 'false' condition waiting\n"));
59	}
60	else { // wait without timeout
61	dmsg(7,("Condition::Waitif() -> waiting for 'false' condition\n"));
62	pthread_cond_wait(&__posix_false_condition, &__posix_mutex);
63	dmsg(7,("Condition::Waitif() -> awakened from 'false' condition waiting\n"));
64	}
65	}
66	else { // wait until condition turned 'true'
67	if (TimeoutSeconds \|\| TimeoutNanoSeconds) { // wait with timeout
68	struct timeval now;
69	gettimeofday(&now, 0);
70	timespec timeout;
71	timeout.tv_sec = now.tv_sec + TimeoutSeconds;
72	timeout.tv_nsec = now.tv_usec * 1000 + TimeoutNanoSeconds;
73	dmsg(7,("Condition::Waitif() -> waiting for 'true' condition with timeout\n"));
74	res = pthread_cond_timedwait(&__posix_true_condition, &__posix_mutex, &timeout);
75	dmsg(7,("Condition::Waitif() -> awakened from 'true' condition waiting\n"));
76	}
77	else { // wait without timeout
78	dmsg(7,("Condition::Waitif() -> waiting for 'true' condition\n"));
79	pthread_cond_wait(&__posix_true_condition, &__posix_mutex);
80	dmsg(7,("Condition::Waitif() -> awakened from 'true' condition waiting\n"));
81	}
82	}
83	}
84	return res;
85	}
86
87	int Condition::WaitAndUnlockIf(bool bCondition, long TimeoutSeconds, long TimeoutNanoSeconds) {
88	int res = WaitIf(bCondition, TimeoutSeconds, TimeoutNanoSeconds);
89	dmsg(7,("Condition::WaitAndUnlockIf() -> UNLOCK()\n"));
90	Unlock();
91	dmsg(7,("Condition::WaitAndUnlockIf() -> UNLOCK() passed\n"));
92	return res;
93	}
94
95	void Condition::Set(bool bCondition) {
96	dmsg(7,("Condition::Set() -> LOCK()\n"));
97	Lock();
98	dmsg(7,("Condition::Set() -> LOCK() passed\n"));
99	if (this->bCondition != bCondition) {
100	this->bCondition = bCondition;
101	if (bCondition) {
102	dmsg(7,("Condition::Set() -> broadcasting 'true' condition\n"));
103	pthread_cond_broadcast(&__posix_true_condition);
104	}
105	else {
106	dmsg(7,("Condition::Set() -> broadcasting 'false' condition\n"));
107	pthread_cond_broadcast(&__posix_false_condition);
108	}
109	}
110	Unlock();
111	}
112
113	bool Condition::GetUnsafe() {
114	return bCondition;
115	}
116
117	} // namespace LinuxSampler