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107 lines
2.8 KiB
C

/*
* Copyright 2013-2019 Software Radio Systems Limited
*
* This file is part of srsLTE.
*
* srsLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* A copy of the GNU Affero General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
/******************************************************************************
* File: rlc_tx_queue.h
* Description: Queue used in RLC TM/UM/AM TX queues.
* Uses a blocking queue with bounded capacity to block higher layers
* when pushing Uplink traffic
* Reference:
*****************************************************************************/
#ifndef SRSLTE_MSG_QUEUE_H
#define SRSLTE_MSG_QUEUE_H
#include "srslte/common/block_queue.h"
#include "srslte/common/common.h"
#include <pthread.h>
namespace srslte {
class rlc_tx_queue : public block_queue<unique_byte_buffer>::call_mutexed_itf
{
public:
rlc_tx_queue(int capacity = 128) : queue(capacity) {
unread_bytes = 0;
queue.set_mutexed_itf(this);
}
// increase/decrease unread_bytes inside push/pop mutexed operations
void pushing(const unique_byte_buffer& msg) final { unread_bytes += msg->N_bytes; }
void popping(const unique_byte_buffer& msg) final
{
if (unread_bytes > msg->N_bytes) {
unread_bytes -= msg->N_bytes;
} else {
unread_bytes = 0;
}
}
void write(unique_byte_buffer msg) { queue.push(std::move(msg)); }
bool try_write(unique_byte_buffer msg) { return queue.try_push(std::move(msg)); }
void read(unique_byte_buffer* msg) { *msg = std::move(queue.wait_pop()); }
bool try_read(unique_byte_buffer* msg) { return queue.try_pop(msg); }
void resize(uint32_t capacity)
{
queue.resize(capacity);
}
uint32_t size()
{
return (uint32_t) queue.size();
}
uint32_t size_bytes()
{
return unread_bytes;
}
uint32_t size_tail_bytes()
{
if (!queue.empty()) {
unique_byte_buffer& m = queue.front();
if (m.get()) {
return m->N_bytes;
}
}
return 0;
}
// This is a hack to reset N_bytes counter when queue is corrupted (see line 89)
void reset() {
unread_bytes = 0;
}
bool is_empty() {
return queue.empty();
}
private:
block_queue<unique_byte_buffer> queue;
uint32_t unread_bytes;
};
} // namespace srslte
#endif // SRSLTE_MSG_QUEUE_H