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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
QM DSP Library
Centre for Digital Music, Queen Mary, University of London.
This file copyright Chris Cannam, used with permission.
*/
#include "Thread.h"
#include <iostream>
#include <cstdlib>
#ifdef USE_PTHREADS
#include <sys/time.h>
#include <time.h>
#endif
using std::cerr;
using std::endl;
using std::string;
#ifdef _WIN32
Thread::Thread() :
m_id(0),
m_extant(false)
{
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Created thread object " << this << endl;
#endif
}
Thread::~Thread()
{
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Destroying thread object " << this << ", id " << m_id << endl;
#endif
if (m_extant) {
WaitForSingleObject(m_id, INFINITE);
}
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Destroyed thread object " << this << endl;
#endif
}
void
Thread::start()
{
m_id = CreateThread(NULL, 0, staticRun, this, 0, 0);
if (!m_id) {
cerr << "ERROR: thread creation failed" << endl;
exit(1);
} else {
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Created thread " << m_id << " for thread object " << this << endl;
#endif
m_extant = true;
}
}
void
Thread::wait()
{
if (m_extant) {
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Waiting on thread " << m_id << " for thread object " << this << endl;
#endif
WaitForSingleObject(m_id, INFINITE);
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Waited on thread " << m_id << " for thread object " << this << endl;
#endif
m_extant = false;
}
}
Thread::Id
Thread::id()
{
return m_id;
}
bool
Thread::threadingAvailable()
{
return true;
}
DWORD
Thread::staticRun(LPVOID arg)
{
Thread *thread = static_cast<Thread *>(arg);
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: " << (void *)GetCurrentThreadId() << ": Running thread " << thread->m_id << " for thread object " << thread << endl;
#endif
thread->run();
return 0;
}
Mutex::Mutex()
#ifndef NO_THREAD_CHECKS
:
m_lockedBy(-1)
#endif
{
m_mutex = CreateMutex(NULL, FALSE, NULL);
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)GetCurrentThreadId() << ": Initialised mutex " << &m_mutex << endl;
#endif
}
Mutex::~Mutex()
{
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)GetCurrentThreadId() << ": Destroying mutex " << &m_mutex << endl;
#endif
CloseHandle(m_mutex);
}
void
Mutex::lock()
{
#ifndef NO_THREAD_CHECKS
DWORD tid = GetCurrentThreadId();
if (m_lockedBy == tid) {
cerr << "ERROR: Deadlock on mutex " << &m_mutex << endl;
}
#endif
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Want to lock mutex " << &m_mutex << endl;
#endif
WaitForSingleObject(m_mutex, INFINITE);
#ifndef NO_THREAD_CHECKS
m_lockedBy = tid;
#endif
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Locked mutex " << &m_mutex << endl;
#endif
}
void
Mutex::unlock()
{
#ifndef NO_THREAD_CHECKS
DWORD tid = GetCurrentThreadId();
if (m_lockedBy != tid) {
cerr << "ERROR: Mutex " << &m_mutex << " not owned by unlocking thread" << endl;
return;
}
#endif
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Unlocking mutex " << &m_mutex << endl;
#endif
#ifndef NO_THREAD_CHECKS
m_lockedBy = -1;
#endif
ReleaseMutex(m_mutex);
}
bool
Mutex::trylock()
{
#ifndef NO_THREAD_CHECKS
DWORD tid = GetCurrentThreadId();
#endif
DWORD result = WaitForSingleObject(m_mutex, 0);
if (result == WAIT_TIMEOUT || result == WAIT_FAILED) {
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Mutex " << &m_mutex << " unavailable" << endl;
#endif
return false;
} else {
#ifndef NO_THREAD_CHECKS
m_lockedBy = tid;
#endif
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Locked mutex " << &m_mutex << " (from trylock)" << endl;
#endif
return true;
}
}
Condition::Condition(string name) :
m_locked(false)
#ifdef DEBUG_CONDITION
, m_name(name)
#endif
{
m_mutex = CreateMutex(NULL, FALSE, NULL);
m_condition = CreateEvent(NULL, FALSE, FALSE, NULL);
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Initialised condition " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
}
Condition::~Condition()
{
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Destroying condition " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
if (m_locked) ReleaseMutex(m_mutex);
CloseHandle(m_condition);
CloseHandle(m_mutex);
}
void
Condition::lock()
{
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Want to lock " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
WaitForSingleObject(m_mutex, INFINITE);
m_locked = true;
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Locked " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
}
void
Condition::unlock()
{
if (!m_locked) {
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Not locked " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
return;
}
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Unlocking " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
m_locked = false;
ReleaseMutex(m_mutex);
}
void
Condition::wait(int us)
{
if (us == 0) {
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Waiting on " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
SignalObjectAndWait(m_mutex, m_condition, INFINITE, FALSE);
WaitForSingleObject(m_mutex, INFINITE);
} else {
DWORD ms = us / 1000;
if (us > 0 && ms == 0) ms = 1;
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Timed waiting on " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
SignalObjectAndWait(m_mutex, m_condition, ms, FALSE);
WaitForSingleObject(m_mutex, INFINITE);
}
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Wait done on " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
m_locked = true;
}
void
Condition::signal()
{
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)GetCurrentThreadId() << ": Signalling " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
SetEvent(m_condition);
}
#else /* !_WIN32 */
#ifdef USE_PTHREADS
Thread::Thread() :
m_id(0),
m_extant(false)
{
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Created thread object " << this << endl;
#endif
}
Thread::~Thread()
{
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Destroying thread object " << this << ", id " << m_id << endl;
#endif
if (m_extant) {
pthread_join(m_id, 0);
}
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Destroyed thread object " << this << endl;
#endif
}
void
Thread::start()
{
if (pthread_create(&m_id, 0, staticRun, this)) {
cerr << "ERROR: thread creation failed" << endl;
exit(1);
} else {
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Created thread " << m_id << " for thread object " << this << endl;
#endif
m_extant = true;
}
}
void
Thread::wait()
{
if (m_extant) {
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Waiting on thread " << m_id << " for thread object " << this << endl;
#endif
pthread_join(m_id, 0);
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: Waited on thread " << m_id << " for thread object " << this << endl;
#endif
m_extant = false;
}
}
Thread::Id
Thread::id()
{
return m_id;
}
bool
Thread::threadingAvailable()
{
return true;
}
void *
Thread::staticRun(void *arg)
{
Thread *thread = static_cast<Thread *>(arg);
#ifdef DEBUG_THREAD
cerr << "THREAD DEBUG: " << (void *)pthread_self() << ": Running thread " << thread->m_id << " for thread object " << thread << endl;
#endif
thread->run();
return 0;
}
Mutex::Mutex()
#ifndef NO_THREAD_CHECKS
:
m_lockedBy(0),
m_locked(false)
#endif
{
pthread_mutex_init(&m_mutex, 0);
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)pthread_self() << ": Initialised mutex " << &m_mutex << endl;
#endif
}
Mutex::~Mutex()
{
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)pthread_self() << ": Destroying mutex " << &m_mutex << endl;
#endif
pthread_mutex_destroy(&m_mutex);
}
void
Mutex::lock()
{
#ifndef NO_THREAD_CHECKS
pthread_t tid = pthread_self();
if (m_locked && m_lockedBy == tid) {
cerr << "ERROR: Deadlock on mutex " << &m_mutex << endl;
}
#endif
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Want to lock mutex " << &m_mutex << endl;
#endif
pthread_mutex_lock(&m_mutex);
#ifndef NO_THREAD_CHECKS
m_lockedBy = tid;
m_locked = true;
#endif
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Locked mutex " << &m_mutex << endl;
#endif
}
void
Mutex::unlock()
{
#ifndef NO_THREAD_CHECKS
pthread_t tid = pthread_self();
if (!m_locked) {
cerr << "ERROR: Mutex " << &m_mutex << " not locked in unlock" << endl;
return;
} else if (m_lockedBy != tid) {
cerr << "ERROR: Mutex " << &m_mutex << " not owned by unlocking thread" << endl;
return;
}
#endif
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Unlocking mutex " << &m_mutex << endl;
#endif
#ifndef NO_THREAD_CHECKS
m_locked = false;
#endif
pthread_mutex_unlock(&m_mutex);
}
bool
Mutex::trylock()
{
#ifndef NO_THREAD_CHECKS
pthread_t tid = pthread_self();
#endif
if (pthread_mutex_trylock(&m_mutex)) {
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Mutex " << &m_mutex << " unavailable" << endl;
#endif
return false;
} else {
#ifndef NO_THREAD_CHECKS
m_lockedBy = tid;
m_locked = true;
#endif
#ifdef DEBUG_MUTEX
cerr << "MUTEX DEBUG: " << (void *)tid << ": Locked mutex " << &m_mutex << " (from trylock)" << endl;
#endif
return true;
}
}
Condition::Condition(string name) :
m_locked(false)
#ifdef DEBUG_CONDITION
, m_name(name)
#endif
{
pthread_mutex_init(&m_mutex, 0);
pthread_cond_init(&m_condition, 0);
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Initialised condition " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
}
Condition::~Condition()
{
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Destroying condition " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
if (m_locked) pthread_mutex_unlock(&m_mutex);
pthread_cond_destroy(&m_condition);
pthread_mutex_destroy(&m_mutex);
}
void
Condition::lock()
{
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Want to lock " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
pthread_mutex_lock(&m_mutex);
m_locked = true;
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Locked " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
}
void
Condition::unlock()
{
if (!m_locked) {
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Not locked " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
return;
}
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Unlocking " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
m_locked = false;
pthread_mutex_unlock(&m_mutex);
}
void
Condition::wait(int us)
{
if (us == 0) {
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Waiting on " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
pthread_cond_wait(&m_condition, &m_mutex);
} else {
struct timeval now;
gettimeofday(&now, 0);
now.tv_usec += us;
while (now.tv_usec > 1000000) {
now.tv_usec -= 1000000;
++now.tv_sec;
}
struct timespec timeout;
timeout.tv_sec = now.tv_sec;
timeout.tv_nsec = now.tv_usec * 1000;
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Timed waiting on " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
pthread_cond_timedwait(&m_condition, &m_mutex, &timeout);
}
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Wait done on " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
m_locked = true;
}
void
Condition::signal()
{
#ifdef DEBUG_CONDITION
cerr << "CONDITION DEBUG: " << (void *)pthread_self() << ": Signalling " << &m_condition << " \"" << m_name << "\"" << endl;
#endif
pthread_cond_signal(&m_condition);
}
#else /* !USE_PTHREADS */
Thread::Thread()
{
}
Thread::~Thread()
{
}
void
Thread::start()
{
abort();
}
void
Thread::wait()
{
abort();
}
Thread::Id
Thread::id()
{
abort();
}
bool
Thread::threadingAvailable()
{
return false;
}
Mutex::Mutex()
{
}
Mutex::~Mutex()
{
}
void
Mutex::lock()
{
abort();
}
void
Mutex::unlock()
{
abort();
}
bool
Mutex::trylock()
{
abort();
}
Condition::Condition(const char *)
{
}
Condition::~Condition()
{
}
void
Condition::lock()
{
abort();
}
void
Condition::wait(int us)
{
abort();
}
void
Condition::signal()
{
abort();
}
#endif /* !USE_PTHREADS */
#endif /* !_WIN32 */
MutexLocker::MutexLocker(Mutex *mutex) :
m_mutex(mutex)
{
if (m_mutex) {
m_mutex->lock();
}
}
MutexLocker::~MutexLocker()
{
if (m_mutex) {
m_mutex->unlock();
}
}
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