barrier/io/CBufferedInputStream.cpp

111 lines
1.8 KiB
C++

#include "CBufferedInputStream.h"
#include "CLock.h"
#include "CMutex.h"
#include "CThread.h"
#include "IJob.h"
#include "XIO.h"
#include <string.h>
#include <assert.h>
//
// CBufferedInputStream
//
CBufferedInputStream::CBufferedInputStream(CMutex* mutex, IJob* closeCB) :
m_mutex(mutex),
m_empty(mutex, true),
m_closeCB(closeCB),
m_closed(false),
m_hungup(false)
{
assert(m_mutex != NULL);
}
CBufferedInputStream::~CBufferedInputStream()
{
delete m_closeCB;
}
void CBufferedInputStream::write(
const void* data, UInt32 n)
{
if (!m_hungup && n > 0) {
m_buffer.write(data, n);
m_empty = (m_buffer.getSize() == 0);
m_empty.broadcast();
}
}
void CBufferedInputStream::hangup()
{
m_hungup = true;
m_empty.broadcast();
}
UInt32 CBufferedInputStream::readNoLock(
void* dst, UInt32 n)
{
if (m_closed) {
throw XIOClosed();
}
// wait for data (or hangup)
while (!m_hungup && m_empty == true) {
m_empty.wait();
}
// read data
const UInt32 count = m_buffer.getSize();
if (n > count) {
n = count;
}
if (n > 0) {
if (dst != NULL) {
memcpy(dst, m_buffer.peek(n), n);
}
m_buffer.pop(n);
}
// update empty state
if (m_buffer.getSize() == 0) {
m_empty = true;
m_empty.broadcast();
}
return n;
}
UInt32 CBufferedInputStream::getSizeNoLock() const
{
return m_buffer.getSize();
}
void CBufferedInputStream::close()
{
CLock lock(m_mutex);
if (m_closed) {
throw XIOClosed();
}
m_closed = true;
m_hungup = true;
m_buffer.pop(m_buffer.getSize());
m_empty.broadcast();
if (m_closeCB) {
m_closeCB->run();
}
}
UInt32 CBufferedInputStream::read(
void* dst, UInt32 n)
{
CLock lock(m_mutex);
return readNoLock(dst, n);
}
UInt32 CBufferedInputStream::getSize() const
{
CLock lock(m_mutex);
return getSizeNoLock();
}