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#include <workqueue.h>
WorkQueue::WorkQueue()
{
stop = false;
works = NULL;
pthread_mutex_init(&wlock, NULL);
pthread_cond_init(&wcond, NULL);
}
WorkQueue::~WorkQueue()
{
StopWork();
pthread_mutex_lock(&wlock);
while (works)
works = __list_delete(works, works);
pthread_mutex_unlock(&wlock);
pthread_cond_destroy(&wcond);
pthread_mutex_destroy(&wlock);
}
int WorkQueue::StartWork(void)
{
return Start();
}
void WorkQueue::StopWork(void)
{
FlushWork();
pthread_mutex_lock(&wlock);
stop = true;
pthread_cond_signal(&wcond); /* wakeup Run() if it's sleeping */
pthread_mutex_unlock(&wlock);
Join();
}
void WorkQueue::Run(void)
{
while (!stop) {
pthread_mutex_lock(&wlock);
/*
* sleeps until works're available.
* wokeup by ScheduleWork() or FlushWork() or ~WorkQueue()
*/
if (works)
pthread_cond_wait(&wcond, &wlock);
while (works) {
struct list *entry = works;
WorkableInterface *wi =
static_cast<WorkableInterface *>(entry->data);
works = __list_delete(works, entry);
pthread_mutex_unlock(&wlock);
DoWork(wi);
pthread_mutex_lock(&wlock);
}
pthread_mutex_unlock(&wlock);
}
}
void WorkQueue::DoWork(WorkableInterface *wi)
{
if (wi)
wi->Work();
}
void WorkQueue::Work(void)
{
return;
}
void WorkQueue::ScheduleWork(void)
{
pthread_mutex_lock(&wlock);
works = list_add_tail(works, static_cast<WorkableInterface *>(this));
pthread_cond_signal(&wcond); /* wakeup Run() if it's sleeping */
pthread_mutex_unlock(&wlock);
}
void WorkQueue::ScheduleWork(WorkableInterface *wi)
{
pthread_mutex_lock(&wlock);
if (wi)
works = list_add_tail(works, wi);
else
works = list_add_tail(works, static_cast<WorkableInterface *>(this));
pthread_cond_signal(&wcond); /* wakeup Run() if it's sleeping */
pthread_mutex_unlock(&wlock);
}
void WorkQueue::CancelScheduledWork(WorkableInterface *wi)
{
pthread_mutex_lock(&wlock);
works = list_delete_all(works, wi);
pthread_mutex_unlock(&wlock);
}
void WorkQueue::FlushWork(void)
{
FlushBarrier fb;
bool needtowait = false;
pthread_mutex_lock(&wlock);
if (works) {
list_add_tail(works, &fb);
pthread_cond_signal(&wcond); /* wakeup Run() if it's sleeping */
needtowait = true;
}
pthread_mutex_unlock(&wlock);
if (needtowait)
fb.WaitCompletion(); /* wokeup by FlushWork::Work() */
}
WorkQueue::FlushBarrier::FlushBarrier()
{
pthread_mutex_init(&cplock, NULL);
pthread_cond_init(&complete, NULL);
}
WorkQueue::FlushBarrier::~FlushBarrier()
{
pthread_cond_destroy(&complete);
pthread_mutex_destroy(&cplock);
}
void WorkQueue::FlushBarrier::WaitCompletion(void)
{
pthread_mutex_lock(&cplock);
pthread_cond_wait(&complete, &cplock);
pthread_mutex_unlock(&cplock);
}
void WorkQueue::FlushBarrier::Work(void)
{
pthread_mutex_lock(&cplock);
pthread_cond_signal(&complete); /* wakeup WaitCompletion() */
pthread_mutex_unlock(&cplock);
}
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