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#include <StacklessTask.h>
#include <TaskMan.h>
#include <SmartWriter.h>
namespace {
struct WriteCell {
~WriteCell() { free(buffer); }
void * buffer = NULL;
uint8_t * ptr;
size_t size;
bool stop = false;
bool close = false;
};
}
class SmartWriterTask : public Balau::StacklessTask {
public:
SmartWriterTask(Balau::IO<Balau::Handle> h) : m_h(h) { m_name.set("SmartWriterTask(%s)", h->getName()); }
void queueWrite(const void * buf, size_t count) {
WriteCell * cell = new WriteCell();
uint8_t * copied = (uint8_t *) malloc(count);
memcpy(copied, buf, count);
cell->buffer = cell->ptr = copied;
cell->size = count;
m_queue.push(cell);
}
void stop(bool closeHandle) {
WriteCell * cell = new WriteCell();
cell->stop = true;
cell->close = closeHandle;
m_queue.push(cell);
}
bool gotError() { return m_gotError.load(); }
private:
virtual ~SmartWriterTask() { empty(); }
virtual const char * getName() const override { return m_name.to_charp(); }
void empty() {
delete m_current;
m_current = NULL;
while (!m_queue.isEmpty())
delete m_queue.pop();
}
virtual void Do() override {
waitFor(m_queue.getEvent());
m_queue.getEvent()->resetMaybe();
bool gotQueue = !m_queue.isEmpty();
if (gotQueue && !m_current) {
m_current = m_queue.pop();
gotQueue = !m_queue.isEmpty();
}
if (!gotQueue && !m_current)
taskSwitch();
if (m_current->stop) {
if (m_current->close)
m_h->close();
delete m_current;
m_current = NULL;
return;
}
ssize_t r = 0;
if (m_gotError.load()) {
delete m_current;
m_current = NULL;
r = -1;
} else {
try {
r = m_h->write(m_current->ptr, m_current->size);
}
catch (Balau::EAgain & e) {
waitFor(e.getEvent());
taskSwitch();
}
}
if (r < 0) {
m_gotError.store(true);
} else {
m_current->ptr += r;
m_current->size -= r;
}
if (m_current && m_current->size == 0) {
delete m_current;
m_current = NULL;
}
if (gotQueue || m_current)
yield();
else
taskSwitch();
}
Balau::IO<Balau::Handle> m_h;
Balau::String m_name;
std::atomic<bool> m_gotError;
Balau::TQueue<WriteCell> m_queue;
WriteCell * m_current = NULL;
};
void Balau::SmartWriter::close() throw (GeneralException) {
if (m_writerTask) {
m_writerTask->stop(!isDetached());
m_writerTask = NULL;
} else {
Filter::close();
}
}
ssize_t Balau::SmartWriter::write(const void * _buf, size_t count) throw (Balau::GeneralException) {
const uint8_t * buf = (const uint8_t *) _buf;
const ssize_t r = count;
while (count) {
if (m_writerTask) {
if (m_writerTask->gotError())
return -1;
m_writerTask->queueWrite(buf, count);
}
ssize_t r = 0;
try {
r = Filter::write(buf, count);
}
catch (EAgain &) {
m_writerTask = TaskMan::registerTask(new SmartWriterTask(getIO()));
}
if (r < 0)
return r;
count -= r;
buf += r;
}
return r;
}
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