genode/repos/os/include/terminal_session/client.h
Alexander Boettcher 22d71d5a8b os: use Mutex/Blockade
Issue #3612
2020-04-17 12:40:12 +02:00

113 lines
2.8 KiB
C++

/*
* \brief Client-side Terminal session interface
* \author Norman Feske
* \date 2011-08-11
*/
/*
* Copyright (C) 2011-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _INCLUDE__TERMINAL_SESSION__CLIENT_H_
#define _INCLUDE__TERMINAL_SESSION__CLIENT_H_
/* Genode includes */
#include <util/misc_math.h>
#include <util/string.h>
#include <base/mutex.h>
#include <base/rpc_client.h>
#include <base/attached_dataspace.h>
#include <terminal_session/terminal_session.h>
namespace Terminal { class Session_client; }
class Terminal::Session_client : public Genode::Rpc_client<Session>
{
private:
Genode::Mutex _mutex { };
/**
* Shared-memory buffer used for carrying the payload
* of read/write operations
*/
Genode::Attached_dataspace _io_buffer;
public:
Session_client(Genode::Region_map &local_rm, Genode::Capability<Session> cap)
:
Genode::Rpc_client<Session>(cap),
_io_buffer(local_rm, call<Rpc_dataspace>())
{ }
Size size() override { return call<Rpc_size>(); }
bool avail() override { return call<Rpc_avail>(); }
Genode::size_t read(void *buf, Genode::size_t buf_size) override
{
Genode::Mutex::Guard _guard(_mutex);
/* instruct server to fill the I/O buffer */
Genode::size_t num_bytes = call<Rpc_read>(buf_size);
/* copy-out I/O buffer */
num_bytes = Genode::min(num_bytes, buf_size);
Genode::memcpy(buf, _io_buffer.local_addr<char>(), num_bytes);
return num_bytes;
}
Genode::size_t write(void const *buf, Genode::size_t num_bytes) override
{
Genode::Mutex::Guard _guard(_mutex);
Genode::size_t written_bytes = 0;
char const * const src = (char const *)buf;
while (written_bytes < num_bytes) {
/* copy payload to I/O buffer */
Genode::size_t payload_bytes = Genode::min(num_bytes - written_bytes,
_io_buffer.size());
Genode::memcpy(_io_buffer.local_addr<char>(),
src + written_bytes, payload_bytes);
/* tell server to pick up new I/O buffer content */
Genode::size_t written_payload_bytes = call<Rpc_write>(payload_bytes);
written_bytes += written_payload_bytes;
if (written_payload_bytes != payload_bytes)
return written_bytes;
}
return written_bytes;
}
void connected_sigh(Genode::Signal_context_capability cap) override
{
call<Rpc_connected_sigh>(cap);
}
void read_avail_sigh(Genode::Signal_context_capability cap) override
{
call<Rpc_read_avail_sigh>(cap);
}
void size_changed_sigh(Genode::Signal_context_capability cap) override
{
call<Rpc_size_changed_sigh>(cap);
}
Genode::size_t io_buffer_size() const { return _io_buffer.size(); }
};
#endif /* _INCLUDE__TERMINAL_SESSION__CLIENT_H_ */