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_private.h"

#if defined(WIN32)
//NOTE: since pthread_condattr_t is not needed in the Condition class so just set it to int
typedef int win32thread_condattr_t;

typedef struct {
                    unsigned long tv_sec;
                    unsigned long tv_nsec;
                } win32_timespec;


int win32thread_cond_init (win32thread_cond_t *cv, const win32thread_condattr_t *)
{
    dmsg(7,("win32thread_cond_init:\n"));
    cv->waiters_count_ = 0;
    cv->was_broadcast_ = 0;
    cv->sema_ = CreateSemaphore (NULL,       // no security
                                 0,          // initially 0
                                 0x7fffffff, // max count
                                 NULL);      // unnamed 
    dmsg(7,("win32thread_cond_init: after CreateSemaphore retval=%d\n",cv->sema_));                                                              
    InitializeCriticalSection (&cv->waiters_count_lock_);
    cv->waiters_done_ = CreateEvent (NULL,  // no security
                                   FALSE, // auto-reset
                                   FALSE, // non-signaled initially
                                   NULL); // unnamed
    dmsg(7,("win32thread_cond_init: after CreateEvent retval=%d\n",cv->waiters_done_));                                                            
                                                                   
    return 0;
}


int win32thread_cond_destroy(win32thread_cond_t *cv) {
  dmsg(7,("win32thread_cond_destroy ptr=%d\n",cv));     
  CloseHandle(cv->waiters_done_);
  DeleteCriticalSection(&cv->waiters_count_lock_);
  CloseHandle(cv->sema_);
  return 0;
}

 
int win32thread_cond_timedwait (win32thread_cond_t *cv, win32thread_mutex_t *external_mutex, win32_timespec *timeout)
{
    dmsg(7,("win32thread_cond_timedwait: external mutex=%d BEGIN!\n",external_mutex));  
    // Avoid race conditions.
    dmsg(7,("win32thread_cond_timedwait: before EnterCriticalSection (&cv->waiters_count_lock_) cv->waiters_count_=%d\n",cv->waiters_count_));
    EnterCriticalSection (&cv->waiters_count_lock_);
    cv->waiters_count_++;
    LeaveCriticalSection (&cv->waiters_count_lock_);
    dmsg(7,("win32thread_cond_timedwait: after LeaveCriticalSection (&cv->waiters_count_lock_) cv->waiters_count_=%d\n",cv->waiters_count_));
        

    // This call atomically releases the mutex and waits on the
    // semaphore until <pthread_cond_signal> or <pthread_cond_broadcast>
    // are called by another thread.
  
    DWORD dwMilliseconds;
    if(timeout->tv_sec || timeout->tv_nsec) {
        dwMilliseconds = timeout->tv_sec * 1000 + timeout->tv_nsec / 1000000;
    }
    else {
        dmsg(7,("win32thread_cond_timedwait: dwMilliseconds = INFINITE\n"));
        dwMilliseconds = INFINITE;
    }
    dmsg(7,("win32thread_cond_timedwait: before SignalObjectAndWait(*external_mutex, cv->sema_, dwMilliseconds, FALSE), dwMilliseconds=%d\n",dwMilliseconds));
    DWORD res;
    res = SignalObjectAndWait (*external_mutex, cv->sema_, dwMilliseconds, FALSE);
    dmsg(7,("win32thread_cond_timedwait: after SignalObjectAndWait, res=%d\n",res));
    if(res == WAIT_TIMEOUT) return -1; 

    // Reacquire lock to avoid race conditions.
    dmsg(7,("win32thread_cond_timedwait: before EnterCriticalSection (2) (&cv->waiters_count_lock_) cv->waiters_count=%d\n",cv->waiters_count_)); 
    EnterCriticalSection (&cv->waiters_count_lock_);
    dmsg(7,("win32thread_cond_timedwait: after EnterCriticalSection (2) (&cv->waiters_count_lock_) cv->waiters_count=%d\n",cv->waiters_count_)); 

    // We're no longer waiting...
    cv->waiters_count_--;

    // Check to see if we're the last waiter after <pthread_cond_broadcast>.
    int last_waiter = cv->was_broadcast_ && cv->waiters_count_ == 0;

    LeaveCriticalSection (&cv->waiters_count_lock_);
    dmsg(7,("win32thread_cond_timedwait: after LeaveCriticalSection (2) (&cv->waiters_count_lock_) last_waiter=%d\n",last_waiter)); 

    // If we're the last waiter thread during this particular broadcast
    // then let all the other threads proceed.
    if (last_waiter) {
        // This call atomically signals the <waiters_done_> event and waits until
        // it can acquire the <external_mutex>.  This is required to ensure fairness. 
        dmsg(7,("win32thread_cond_timedwait: before SignalObjectAndWait (cv->waiters_done_, *external_mutex, dwMilliseconds, FALSE) \n"));
        res = SignalObjectAndWait (cv->waiters_done_, *external_mutex, dwMilliseconds, FALSE);
        dmsg(7,("win32thread_cond_timedwait: after SignalObjectAndWait (cv->waiters_done_, *external_mutex, dwMilliseconds, FALSE) res=%d\n",res));
        if(res == WAIT_TIMEOUT) {
            dmsg(7,("win32thread_cond_timedwait: after SignalObjectAndWait: WAIT_TIMEOUT! returning -1\n"));
            return -1;
        }
    }
    else {
        // Always regain the external mutex since that's the guarantee we
        // give to our callers. 
        dmsg(7,("win32thread_cond_timedwait: before WaitForSingleObject (*external_mutex, dwMilliseconds)\n"));
        res = WaitForSingleObject (*external_mutex, dwMilliseconds);
        dmsg(7,("win32thread_cond_timedwait: after WaitForSingleObject (*external_mutex, dwMilliseconds) res=%d\n",res));
        if(res == WAIT_TIMEOUT) {
            dmsg(7,("win32thread_cond_timedwait: after WaitForSingleObject: WAIT_TIMEOUT ! returning -1\n"));
            return -1;
        }
    }
    dmsg(7,("win32thread_cond_timedwait: all OK. returning 0\n"));
    return 0;
}

int win32thread_cond_signal (win32thread_cond_t *cv)
{

    dmsg(7,("win32thread_cond_signal cv=%d\n",cv));
    dmsg(7,("win32thread_cond_signal before EnterCriticalSection (&cv->waiters_count_lock_)\n"));
    EnterCriticalSection (&cv->waiters_count_lock_);
    int have_waiters = cv->waiters_count_ > 0;
    LeaveCriticalSection (&cv->waiters_count_lock_);
    dmsg(7,("win32thread_cond_signal after LeaveCriticalSection (&cv->waiters_count_lock_)\n"));

    dmsg(7,("win32thread_cond_signal have_waiters=%d\n",have_waiters));
    // If there aren't any waiters, then this is a no-op.  
    if (have_waiters) {
        dmsg(7,("win32thread_cond have_waiters is TRUE,  before ReleaseSemaphore (cv->sema_, 1, 0)\n"));
        ReleaseSemaphore (cv->sema_, 1, 0);
    }
    dmsg(7,("win32thread_cond_signal: all OK. returning 0\n"));
    return 0;
}

int win32thread_cond_wait (win32thread_cond_t *cv, win32thread_mutex_t *external_mutex) {
    dmsg(7,("win32thread_cond_wait: (calls win32thread_cond_timedwait)  cv=%d  external_mutex=%d\n",cv, external_mutex));
    win32_timespec timeout;
    timeout.tv_sec = 0;
    timeout.tv_nsec = 0;
    return win32thread_cond_timedwait (cv, external_mutex, &timeout);
}

int win32thread_cond_broadcast (win32thread_cond_t *cv)
{
    DWORD res;
    dmsg(7,("win32thread_cond_broadcast: cv=%d\n",cv));
    dmsg(7,("win32thread_cond_broadcast: before EnterCriticalSection (&cv->waiters_count_lock_)\n"));
    // This is needed to ensure that <waiters_count_> and <was_broadcast_> are
    // consistent relative to each other.
    EnterCriticalSection (&cv->waiters_count_lock_);
    int have_waiters = 0;

    dmsg(7,("win32thread_cond_broadcast: cv->waiters_count_=%d\n",cv->waiters_count_));
    if (cv->waiters_count_ > 0) {
        dmsg(7,("win32thread_cond_broadcast: cv->waiters_count > 0 !\n"));
        // We are broadcasting, even if there is just one waiter...
        // Record that we are broadcasting, which helps optimize
        // <pthread_cond_wait> for the non-broadcast case.
        cv->was_broadcast_ = 1;
        have_waiters = 1;
    }
    dmsg(7,("win32thread_cond_broadcast: cv->was_broadcast_=%d  have_waiters=%d\n",cv->was_broadcast_,have_waiters));

    if (have_waiters) {
        // Wake up all the waiters atomically.
        dmsg(7,("win32thread_cond_broadcast: have_waiters ! before ReleaseSemaphore (cv->sema_, cv->waiters_count_, 0);\n"));
        ReleaseSemaphore (cv->sema_, cv->waiters_count_, 0);

        LeaveCriticalSection (&cv->waiters_count_lock_);
        dmsg(7,("win32thread_cond_broadcast: have_waiters ! after LeaveCriticalSection (&cv->waiters_count_lock_)\n"));

        // Wait for all the awakened threads to acquire the counting
        // semaphore. 
        dmsg(7,("win32thread_cond_broadcast: before WaitForSingleObject (cv->waiters_done_, INFINITE)\n"));
        res = WaitForSingleObject (cv->waiters_done_, INFINITE);
        dmsg(7,("win32thread_cond_broadcast: after WaitForSingleObject (cv->waiters_done_, INFINITE) res=%d\n",res));
        // This assignment is okay, even without the <waiters_count_lock_> held 
        // because no other waiter threads can wake up to access it.
        cv->was_broadcast_ = 0;
    }
    else {
        LeaveCriticalSection (&cv->waiters_count_lock_);
        dmsg(7,("win32thread_cond_broadcast: after LeaveCriticalSection (&cv->waiters_count_lock_)\n"));
    }
        dmsg(7,("win32thread_cond_broadcast: all OK, returning 0.\n"));
    return 0;
}


#endif


namespace LinuxSampler {

Condition::Condition(bool bInitialCondition) {
dmsg(7,("Condition:: constructor, bInitialCondition=%d\n", bInitialCondition));
#if defined(WIN32)
    win32thread_cond_init(&__win32_true_condition, NULL);
    win32thread_cond_init(&__win32_false_condition, NULL);
#else
    pthread_cond_init(&__posix_true_condition, NULL);
    pthread_cond_init(&__posix_false_condition, NULL);
#endif  
    bCondition = bInitialCondition;
}

Condition::~Condition() {
#if defined(WIN32)
    win32thread_cond_destroy(&__win32_true_condition);
    win32thread_cond_destroy(&__win32_false_condition);
#else
    pthread_cond_destroy(&__posix_true_condition);
    pthread_cond_destroy(&__posix_false_condition);
#endif
}

int Condition::WaitIf(bool bCondition, long TimeoutSeconds, long TimeoutNanoSeconds) {
    dmsg(7,("Condition::WaitIf: bCondition=%d  TimeoutSeconds=%d  TimeoutNanoSeconds=%d\n",bCondition, TimeoutSeconds, 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 defined(WIN32)
            win32_timespec timeout;
            timeout.tv_sec  = TimeoutSeconds;
            timeout.tv_nsec = TimeoutNanoSeconds;
            dmsg(7,("Condition::Waitif() -> waiting for 'false' condition with timeout\n"));
            res = win32thread_cond_timedwait(&__win32_false_condition, &hMutex, &timeout);
            dmsg(7,("Condition::Waitif() -> awakened from 'false' condition waiting\n"));
            #else
            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"));
            }
            #endif
        }
        else { // wait until condition turned 'true'
            #if defined(WIN32)
            win32_timespec timeout;
            timeout.tv_sec  = TimeoutSeconds;
            timeout.tv_nsec = TimeoutNanoSeconds;
            dmsg(7,("Condition::Waitif() -> waiting for 'true' condition with timeout\n"));
            res = win32thread_cond_timedwait(&__win32_true_condition, &hMutex, &timeout);
            dmsg(7,("Condition::Waitif() -> awakened from 'true' condition waiting\n"));
            #else
            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"));
            }
            #endif
        }
    }
    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"));
            #if defined(WIN32)
            win32thread_cond_broadcast(&__win32_true_condition);
            #else
            pthread_cond_broadcast(&__posix_true_condition);
            #endif
        }
        else {
            dmsg(7,("Condition::Set() -> broadcasting 'false' condition\n"));
            #if defined(WIN32)
            win32thread_cond_broadcast(&__win32_false_condition);
            #else
            pthread_cond_broadcast(&__posix_false_condition);
            #endif
        }
    }
    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_private.h"
29
30	#if defined(WIN32)
31	//NOTE: since pthread_condattr_t is not needed in the Condition class so just set it to int
32	typedef int win32thread_condattr_t;
33
34	typedef struct {
35	unsigned long tv_sec;
36	unsigned long tv_nsec;
37	} win32_timespec;
38
39
40	int win32thread_cond_init (win32thread_cond_t cv, const win32thread_condattr_t )
41	{
42	dmsg(7,("win32thread_cond_init:\n"));
43	cv->waiters_count_ = 0;
44	cv->was_broadcast_ = 0;
45	cv->sema_ = CreateSemaphore (NULL, // no security
46	0, // initially 0
47	0x7fffffff, // max count
48	NULL); // unnamed
49	dmsg(7,("win32thread_cond_init: after CreateSemaphore retval=%d\n",cv->sema_));
50	InitializeCriticalSection (&cv->waiters_count_lock_);
51	cv->waiters_done_ = CreateEvent (NULL, // no security
52	FALSE, // auto-reset
53	FALSE, // non-signaled initially
54	NULL); // unnamed
55	dmsg(7,("win32thread_cond_init: after CreateEvent retval=%d\n",cv->waiters_done_));
56
57	return 0;
58	}
59
60
61	int win32thread_cond_destroy(win32thread_cond_t *cv) {
62	dmsg(7,("win32thread_cond_destroy ptr=%d\n",cv));
63	CloseHandle(cv->waiters_done_);
64	DeleteCriticalSection(&cv->waiters_count_lock_);
65	CloseHandle(cv->sema_);
66	return 0;
67	}
68
69
70
71
72	int win32thread_cond_timedwait (win32thread_cond_t cv, win32thread_mutex_t external_mutex, win32_timespec *timeout)
73	{
74	dmsg(7,("win32thread_cond_timedwait: external mutex=%d BEGIN!\n",external_mutex));
75	// Avoid race conditions.
76	dmsg(7,("win32thread_cond_timedwait: before EnterCriticalSection (&cv->waiters_count_lock_) cv->waiters_count_=%d\n",cv->waiters_count_));
77	EnterCriticalSection (&cv->waiters_count_lock_);
78	cv->waiters_count_++;
79	LeaveCriticalSection (&cv->waiters_count_lock_);
80	dmsg(7,("win32thread_cond_timedwait: after LeaveCriticalSection (&cv->waiters_count_lock_) cv->waiters_count_=%d\n",cv->waiters_count_));
81
82
83	// This call atomically releases the mutex and waits on the
84	// semaphore until <pthread_cond_signal> or <pthread_cond_broadcast>
85	// are called by another thread.
86
87	DWORD dwMilliseconds;
88	if(timeout->tv_sec \|\| timeout->tv_nsec) {
89	dwMilliseconds = timeout->tv_sec * 1000 + timeout->tv_nsec / 1000000;
90	}
91	else {
92	dmsg(7,("win32thread_cond_timedwait: dwMilliseconds = INFINITE\n"));
93	dwMilliseconds = INFINITE;
94	}
95	dmsg(7,("win32thread_cond_timedwait: before SignalObjectAndWait(*external_mutex, cv->sema_, dwMilliseconds, FALSE), dwMilliseconds=%d\n",dwMilliseconds));
96	DWORD res;
97	res = SignalObjectAndWait (*external_mutex, cv->sema_, dwMilliseconds, FALSE);
98	dmsg(7,("win32thread_cond_timedwait: after SignalObjectAndWait, res=%d\n",res));
99	if(res == WAIT_TIMEOUT) return -1;
100
101	// Reacquire lock to avoid race conditions.
102	dmsg(7,("win32thread_cond_timedwait: before EnterCriticalSection (2) (&cv->waiters_count_lock_) cv->waiters_count=%d\n",cv->waiters_count_));
103	EnterCriticalSection (&cv->waiters_count_lock_);
104	dmsg(7,("win32thread_cond_timedwait: after EnterCriticalSection (2) (&cv->waiters_count_lock_) cv->waiters_count=%d\n",cv->waiters_count_));
105
106	// We're no longer waiting...
107	cv->waiters_count_--;
108
109	// Check to see if we're the last waiter after <pthread_cond_broadcast>.
110	int last_waiter = cv->was_broadcast_ && cv->waiters_count_ == 0;
111
112	LeaveCriticalSection (&cv->waiters_count_lock_);
113	dmsg(7,("win32thread_cond_timedwait: after LeaveCriticalSection (2) (&cv->waiters_count_lock_) last_waiter=%d\n",last_waiter));
114
115	// If we're the last waiter thread during this particular broadcast
116	// then let all the other threads proceed.
117	if (last_waiter) {
118	// This call atomically signals the <waiters_done_> event and waits until
119	// it can acquire the <external_mutex>. This is required to ensure fairness.
120	dmsg(7,("win32thread_cond_timedwait: before SignalObjectAndWait (cv->waiters_done_, *external_mutex, dwMilliseconds, FALSE) \n"));
121	res = SignalObjectAndWait (cv->waiters_done_, *external_mutex, dwMilliseconds, FALSE);
122	dmsg(7,("win32thread_cond_timedwait: after SignalObjectAndWait (cv->waiters_done_, *external_mutex, dwMilliseconds, FALSE) res=%d\n",res));
123	if(res == WAIT_TIMEOUT) {
124	dmsg(7,("win32thread_cond_timedwait: after SignalObjectAndWait: WAIT_TIMEOUT! returning -1\n"));
125	return -1;
126	}
127	}
128	else {
129	// Always regain the external mutex since that's the guarantee we
130	// give to our callers.
131	dmsg(7,("win32thread_cond_timedwait: before WaitForSingleObject (*external_mutex, dwMilliseconds)\n"));
132	res = WaitForSingleObject (*external_mutex, dwMilliseconds);
133	dmsg(7,("win32thread_cond_timedwait: after WaitForSingleObject (*external_mutex, dwMilliseconds) res=%d\n",res));
134	if(res == WAIT_TIMEOUT) {
135	dmsg(7,("win32thread_cond_timedwait: after WaitForSingleObject: WAIT_TIMEOUT ! returning -1\n"));
136	return -1;
137	}
138	}
139	dmsg(7,("win32thread_cond_timedwait: all OK. returning 0\n"));
140	return 0;
141	}
142
143	int win32thread_cond_signal (win32thread_cond_t *cv)
144	{
145
146	dmsg(7,("win32thread_cond_signal cv=%d\n",cv));
147	dmsg(7,("win32thread_cond_signal before EnterCriticalSection (&cv->waiters_count_lock_)\n"));
148	EnterCriticalSection (&cv->waiters_count_lock_);
149	int have_waiters = cv->waiters_count_ > 0;
150	LeaveCriticalSection (&cv->waiters_count_lock_);
151	dmsg(7,("win32thread_cond_signal after LeaveCriticalSection (&cv->waiters_count_lock_)\n"));
152
153	dmsg(7,("win32thread_cond_signal have_waiters=%d\n",have_waiters));
154	// If there aren't any waiters, then this is a no-op.
155	if (have_waiters) {
156	dmsg(7,("win32thread_cond have_waiters is TRUE, before ReleaseSemaphore (cv->sema_, 1, 0)\n"));
157	ReleaseSemaphore (cv->sema_, 1, 0);
158	}
159	dmsg(7,("win32thread_cond_signal: all OK. returning 0\n"));
160	return 0;
161	}
162
163	int win32thread_cond_wait (win32thread_cond_t cv, win32thread_mutex_t external_mutex) {
164	dmsg(7,("win32thread_cond_wait: (calls win32thread_cond_timedwait) cv=%d external_mutex=%d\n",cv, external_mutex));
165	win32_timespec timeout;
166	timeout.tv_sec = 0;
167	timeout.tv_nsec = 0;
168	return win32thread_cond_timedwait (cv, external_mutex, &timeout);
169	}
170
171	int win32thread_cond_broadcast (win32thread_cond_t *cv)
172	{
173	DWORD res;
174	dmsg(7,("win32thread_cond_broadcast: cv=%d\n",cv));
175	dmsg(7,("win32thread_cond_broadcast: before EnterCriticalSection (&cv->waiters_count_lock_)\n"));
176	// This is needed to ensure that <waiters_count_> and <was_broadcast_> are
177	// consistent relative to each other.
178	EnterCriticalSection (&cv->waiters_count_lock_);
179	int have_waiters = 0;
180
181	dmsg(7,("win32thread_cond_broadcast: cv->waiters_count_=%d\n",cv->waiters_count_));
182	if (cv->waiters_count_ > 0) {
183	dmsg(7,("win32thread_cond_broadcast: cv->waiters_count > 0 !\n"));
184	// We are broadcasting, even if there is just one waiter...
185	// Record that we are broadcasting, which helps optimize
186	// <pthread_cond_wait> for the non-broadcast case.
187	cv->was_broadcast_ = 1;
188	have_waiters = 1;
189	}
190	dmsg(7,("win32thread_cond_broadcast: cv->was_broadcast_=%d have_waiters=%d\n",cv->was_broadcast_,have_waiters));
191
192	if (have_waiters) {
193	// Wake up all the waiters atomically.
194	dmsg(7,("win32thread_cond_broadcast: have_waiters ! before ReleaseSemaphore (cv->sema_, cv->waiters_count_, 0);\n"));
195	ReleaseSemaphore (cv->sema_, cv->waiters_count_, 0);
196
197	LeaveCriticalSection (&cv->waiters_count_lock_);
198	dmsg(7,("win32thread_cond_broadcast: have_waiters ! after LeaveCriticalSection (&cv->waiters_count_lock_)\n"));
199
200	// Wait for all the awakened threads to acquire the counting
201	// semaphore.
202	dmsg(7,("win32thread_cond_broadcast: before WaitForSingleObject (cv->waiters_done_, INFINITE)\n"));
203	res = WaitForSingleObject (cv->waiters_done_, INFINITE);
204	dmsg(7,("win32thread_cond_broadcast: after WaitForSingleObject (cv->waiters_done_, INFINITE) res=%d\n",res));
205	// This assignment is okay, even without the <waiters_count_lock_> held
206	// because no other waiter threads can wake up to access it.
207	cv->was_broadcast_ = 0;
208	}
209	else {
210	LeaveCriticalSection (&cv->waiters_count_lock_);
211	dmsg(7,("win32thread_cond_broadcast: after LeaveCriticalSection (&cv->waiters_count_lock_)\n"));
212	}
213	dmsg(7,("win32thread_cond_broadcast: all OK, returning 0.\n"));
214	return 0;
215	}
216
217
218
219	#endif
220
221
222	namespace LinuxSampler {
223
224	Condition::Condition(bool bInitialCondition) {
225	dmsg(7,("Condition:: constructor, bInitialCondition=%d\n", bInitialCondition));
226	#if defined(WIN32)
227	win32thread_cond_init(&__win32_true_condition, NULL);
228	win32thread_cond_init(&__win32_false_condition, NULL);
229	#else
230	pthread_cond_init(&__posix_true_condition, NULL);
231	pthread_cond_init(&__posix_false_condition, NULL);
232	#endif
233	bCondition = bInitialCondition;
234	}
235
236	Condition::~Condition() {
237	#if defined(WIN32)
238	win32thread_cond_destroy(&__win32_true_condition);
239	win32thread_cond_destroy(&__win32_false_condition);
240	#else
241	pthread_cond_destroy(&__posix_true_condition);
242	pthread_cond_destroy(&__posix_false_condition);
243	#endif
244	}
245
246	int Condition::WaitIf(bool bCondition, long TimeoutSeconds, long TimeoutNanoSeconds) {
247	dmsg(7,("Condition::WaitIf: bCondition=%d TimeoutSeconds=%d TimeoutNanoSeconds=%d\n",bCondition, TimeoutSeconds, TimeoutNanoSeconds));
248	dmsg(7,("Condition::Waitif() -> LOCK()\n"));
249	Lock();
250	dmsg(7,("Condition::Waitif() -> LOCK() passed\n"));
251	int res = 0;
252	if (this->bCondition == bCondition) {
253	if (bCondition) { // wait until condition turned 'false'
254	#if defined(WIN32)
255	win32_timespec timeout;
256	timeout.tv_sec = TimeoutSeconds;
257	timeout.tv_nsec = TimeoutNanoSeconds;
258	dmsg(7,("Condition::Waitif() -> waiting for 'false' condition with timeout\n"));
259	res = win32thread_cond_timedwait(&__win32_false_condition, &hMutex, &timeout);
260	dmsg(7,("Condition::Waitif() -> awakened from 'false' condition waiting\n"));
261	#else
262	if (TimeoutSeconds \|\| TimeoutNanoSeconds) { // wait with timeout
263	struct timeval now;
264	gettimeofday(&now, 0);
265	timespec timeout;
266	timeout.tv_sec = now.tv_sec + TimeoutSeconds;
267	timeout.tv_nsec = now.tv_usec * 1000 + TimeoutNanoSeconds;
268	dmsg(7,("Condition::Waitif() -> waiting for 'false' condition with timeout\n"));
269	res = pthread_cond_timedwait(&__posix_false_condition, &__posix_mutex, &timeout);
270	dmsg(7,("Condition::Waitif() -> awakened from 'false' condition waiting\n"));
271	}
272	else { // wait without timeout
273	dmsg(7,("Condition::Waitif() -> waiting for 'false' condition\n"));
274	pthread_cond_wait(&__posix_false_condition, &__posix_mutex);
275	dmsg(7,("Condition::Waitif() -> awakened from 'false' condition waiting\n"));
276	}
277	#endif
278	}
279	else { // wait until condition turned 'true'
280	#if defined(WIN32)
281	win32_timespec timeout;
282	timeout.tv_sec = TimeoutSeconds;
283	timeout.tv_nsec = TimeoutNanoSeconds;
284	dmsg(7,("Condition::Waitif() -> waiting for 'true' condition with timeout\n"));
285	res = win32thread_cond_timedwait(&__win32_true_condition, &hMutex, &timeout);
286	dmsg(7,("Condition::Waitif() -> awakened from 'true' condition waiting\n"));
287	#else
288	if (TimeoutSeconds \|\| TimeoutNanoSeconds) { // wait with timeout
289	struct timeval now;
290	gettimeofday(&now, 0);
291	timespec timeout;
292	timeout.tv_sec = now.tv_sec + TimeoutSeconds;
293	timeout.tv_nsec = now.tv_usec * 1000 + TimeoutNanoSeconds;
294	dmsg(7,("Condition::Waitif() -> waiting for 'true' condition with timeout\n"));
295	res = pthread_cond_timedwait(&__posix_true_condition, &__posix_mutex, &timeout);
296	dmsg(7,("Condition::Waitif() -> awakened from 'true' condition waiting\n"));
297	}
298	else { // wait without timeout
299	dmsg(7,("Condition::Waitif() -> waiting for 'true' condition\n"));
300	pthread_cond_wait(&__posix_true_condition, &__posix_mutex);
301	dmsg(7,("Condition::Waitif() -> awakened from 'true' condition waiting\n"));
302	}
303	#endif
304	}
305	}
306	return res;
307	}
308
309	int Condition::WaitAndUnlockIf(bool bCondition, long TimeoutSeconds, long TimeoutNanoSeconds) {
310	int res = WaitIf(bCondition, TimeoutSeconds, TimeoutNanoSeconds);
311	dmsg(7,("Condition::WaitAndUnlockIf() -> UNLOCK()\n"));
312	Unlock();
313	dmsg(7,("Condition::WaitAndUnlockIf() -> UNLOCK() passed\n"));
314	return res;
315	}
316
317	void Condition::Set(bool bCondition) {
318	dmsg(7,("Condition::Set() -> LOCK()\n"));
319	Lock();
320	dmsg(7,("Condition::Set() -> LOCK() passed\n"));
321	if (this->bCondition != bCondition) {
322	this->bCondition = bCondition;
323	if (bCondition) {
324	dmsg(7,("Condition::Set() -> broadcasting 'true' condition\n"));
325	#if defined(WIN32)
326	win32thread_cond_broadcast(&__win32_true_condition);
327	#else
328	pthread_cond_broadcast(&__posix_true_condition);
329	#endif
330	}
331	else {
332	dmsg(7,("Condition::Set() -> broadcasting 'false' condition\n"));
333	#if defined(WIN32)
334	win32thread_cond_broadcast(&__win32_false_condition);
335	#else
336	pthread_cond_broadcast(&__posix_false_condition);
337	#endif
338	}
339	}
340	Unlock();
341	}
342
343	bool Condition::GetUnsafe() {
344	return bCondition;
345	}
346
347	} // namespace LinuxSampler