Add packet loss statistics.

prrt/cprrt.pxd

@@ -143,10 +143,10 @@ cdef extern from "proto/socket.h":
     uint32_t PrrtSocket_get_rtprop(PrrtSocket *socket)
 
     bint PrrtSocket_uses_thread_pinning(PrrtSocket *socket)
+    uint32_t PrrtSocket_get_rtt(PrrtSocket *socket)
+    float PrrtSocket_get_plr(PrrtSocket *socket)
     bint PrrtSocket_enable_thread_pinning(PrrtSocket *socket)
 
-
-
 cdef extern from "proto/stores/packetDeliveryStore.h":
     ctypedef struct PrrtPacketDeliveryStore:
         pass

prrt/proto/CMakeLists.txt

@@ -10,7 +10,7 @@ add_library(PRRT ../defines.h
         applicationConstraints.c applicationConstraints.h
         vdmcode/block_code.c vdmcode/block_code.h
         stores/deliveredPacketTable.c stores/deliveredPacketTable.h
-        stores/lossGatherer.c stores/lossGatherer.h
+        types/lossStatistics.c types/lossStatistics.h
         processes/dataReceiver.c processes/dataReceiver.h
         processes/feedbackReceiver.c processes/feedbackReceiver.h
         processes/dataTransmitter.c processes/dataTransmitter.h
@@ -18,6 +18,7 @@ add_library(PRRT ../defines.h
         stores/packetTimeoutTable.c stores/packetTimeoutTable.h
         stores/dataPacketStore.c stores/dataPacketStore.h
         types/packetTimeout.c types/packetTimeout.h
-        stores/packetDeliveryStore.c stores/packetDeliveryStore.h)
+        stores/packetDeliveryStore.c stores/packetDeliveryStore.h
+        stores/receptionTable.c stores/receptionTable.h)
 
 target_link_libraries(PRRT rt)

prrt/proto/channelStateInformation.c

@@ -33,6 +33,13 @@ void PrrtChannelStateInformation_update_rtprop(PrrtChannelStateInformation *csi,
     pthread_mutex_unlock(&csi->lock);
 }
 
+void PrrtChannelStateInformation_update_plr(PrrtChannelStateInformation *csi, prrtSequenceNumber_t erasures,
+                                                   prrtSequenceNumber_t packets) {
+    pthread_mutex_lock(&csi->lock);
+    csi->plr = ((float) erasures) / packets;
+    pthread_mutex_unlock(&csi->lock);
+}
+
 
 prrtTimedelta_t PrrtChannelStateInformation_get_rtprop(PrrtChannelStateInformation *csi)
 {
@@ -50,3 +57,7 @@ bool PrrtChannelStateInformation_destroy(PrrtChannelStateInformation *csi)
     error:
         return false;
 }
+
+prrtPacketLossRate_t PrrtChannelStateInformation_get_plr(PrrtChannelStateInformation *csi) {
+    return csi->plr;
+}

prrt/proto/channelStateInformation.h

@@ -10,11 +10,15 @@ typedef struct prrtChannelStateInformation {
     prrtTimestamp_t rtprop_stamp;
     prrtTimedelta_t rtprop_filter_length_us;
     bool rtprop_expired;
+    prrtPacketLossRate_t plr;
 } PrrtChannelStateInformation;
 
 PrrtChannelStateInformation* PrrtChannelStateInformation_create(void);
 void PrrtChannelStateInformation_update_rtprop(PrrtChannelStateInformation *csi, prrtTimedelta_t rtprop);
 prrtTimedelta_t PrrtChannelStateInformation_get_rtprop(PrrtChannelStateInformation *csi);
+prrtPacketLossRate_t PrrtChannelStateInformation_get_plr(PrrtChannelStateInformation* csi);
+void PrrtChannelStateInformation_update_plr(PrrtChannelStateInformation *csi, prrtSequenceNumber_t erasures,
+                                                   prrtSequenceNumber_t packets);
 bool PrrtChannelStateInformation_destroy(PrrtChannelStateInformation* csi);
 
 void PrrtChannelStateInformation_print(PrrtChannelStateInformation *csi);

prrt/proto/packet.c

@@ -409,7 +409,6 @@ void *decode_data_header(void *dstBuffer, const void *srcBuffer) {
     return dstBuffer;
 }
 
-
 int PrrtPacket_destroy(PrrtPacket *packet) {
     if (packet->payload != NULL) {
         free(packet->payload);
@@ -494,7 +493,8 @@ PrrtPacket *PrrtPacket_create_feedback_packet(uint8_t priority, uint8_t index, p
                                               prrtTimedelta_t groupRTT, prrtSequenceNumber_t gapLength,
                                               prrtSequenceNumber_t gapCount, prrtSequenceNumber_t burstLength,
                                               prrtSequenceNumber_t burstCount, uint32_t bandwidth,
-                                              uint32_t receiverAddr, prrtTimestamp_t forwardTripTime) {
+                                              uint32_t receiverAddr, prrtTimestamp_t forwardTripTime,
+                                              prrtSequenceNumber_t erasureCount, prrtSequenceNumber_t packetCount) {
     PrrtPacket *packet = create_header(priority, sequenceNumber, PRRT_PACKET_FEEDBACK_HEADER_SIZE, PACKET_TYPE_FEEDBACK,
                                        index);
 
@@ -505,8 +505,8 @@ PrrtPacket *PrrtPacket_create_feedback_packet(uint8_t priority, uint8_t index, p
     payload->receiverAddress = receiverAddr;
     payload->groupRTT_us = groupRTT;
     payload->forwardTripTimestamp_us = forwardTripTime;
-    payload->erasureCount = 0;
-    payload->packetCount = 0;
+    payload->erasureCount = erasureCount;
+    payload->packetCount = packetCount;
     payload->gapLength = gapLength;
     payload->gapCount = gapCount;
     payload->burstLength = burstLength;

prrt/proto/packet.h

@@ -22,6 +22,7 @@ typedef uint32_t prrtTimestamp_t;
 typedef uint32_t prrtTimedelta_t;
 typedef int32_t prrtTimeDifference_t;
 typedef uint32_t prrtPacketLength_t;
+typedef float prrtPacketLossRate_t;
 
 typedef struct prrtIncompleteBlock {
     prrtSequenceNumber_t sequenceNumberBase;
@@ -29,7 +30,7 @@ typedef struct prrtIncompleteBlock {
 } PrrtIncompleteBlock;
 
 typedef struct prrtPacket {
-	ListNode asListNode;
+    ListNode asListNode;
     uint8_t type_priority;
     prrtIndex_t index;
     prrtSequenceNumber_t sequenceNumber;
@@ -90,12 +91,14 @@ PrrtPacket *PrrtPacket_create_feedback_packet(uint8_t priority, uint8_t index, p
                                               prrtTimedelta_t groupRTT, prrtSequenceNumber_t gapLength,
                                               prrtSequenceNumber_t gapCount, prrtSequenceNumber_t burstLength,
                                               prrtSequenceNumber_t burstCount, uint32_t bandwidth,
-                                              uint32_t receiverAddr, prrtTimestamp_t forwardTripTime);
+                                              uint32_t receiverAddr, prrtTimestamp_t forwardTripTime,
+                                              prrtSequenceNumber_t erasureCount, prrtSequenceNumber_t packetCount);
 
 PrrtPacket *PrrtPacket_create_redundancy_packet(uint8_t priority, void *payloadPointer,
                                                 prrtPacketLength_t payloadLength,
                                                 prrtSequenceNumber_t sequenceNumber, uint8_t index,
-                                                prrtSequenceNumber_t baseSequenceNumber, PrrtCodingParams* codingParams);
+                                                prrtSequenceNumber_t baseSequenceNumber,
+                                                PrrtCodingParams *codingParams);
 
 bool PrrtPacket_decode(void *srcBuffer, uint16_t srcBufferSize, PrrtPacket *targetPacket);
 

prrt/proto/processes/dataReceiver.c

 #include <netdb.h>
 #include <stdio.h>
 #include <arpa/inet.h>
-#include <sys/time.h>
 #include "../../defines.h"
 #include "../../util/dbg.h"
 #include "../../util/common.h"
+#include "../types/lossStatistics.h"
 #include "../block.h"
 #include "../clock.h"
 #include "../socket.h"
@@ -66,9 +66,11 @@ static bool send_feedback(const PrrtSocket *sock_ptr, struct sockaddr_in remote)
     prrtTimestamp_t forwardTripTime = (uint32_t) (((int64_t) PrrtClock_get_current_time_us()) +
                                                   (sock_ptr->lastSentTimestamp - sock_ptr->lastReceivedTimestamp));
 
+    PrrtLossStatistics stats = sock_ptr->lossStatistics;
+
     PrrtPacket *feedback_pkt_ptr = PrrtPacket_create_feedback_packet(0, 19, 4715, 0, 4, 6, 8, 9, 5,
                                                                      sock_ptr->address->sin_addr.s_addr,
-                                                                     forwardTripTime);
+                                                                     forwardTripTime, stats.erasureCount, stats.packetCount);
     prrtPacketLength_t length = PrrtPacket_size(feedback_pkt_ptr);
     void *buf = calloc(1, length);
     check_mem(buf);
@@ -104,6 +106,7 @@ static void handle_data_packet(PrrtSocket *sock_ptr, PrrtPacket *packet, struct
     check(PrrtPacketTimeoutTable_insert(sock_ptr->packetTimeoutTable, packetTimeout), "Could not insert data packet.");
 
     prrtSequenceNumber_t seqno = packet->sequenceNumber;
+    PrrtReceptionTable_mark_received(sock_ptr->dataReceptionTable, seqno);
 
     XlapTimeStampCycle(sock_ptr, ts_data_packet, seqno, SendFeedbackStart);
     check(send_feedback(sock_ptr, remote), "Sending feedback failed.");
@@ -153,6 +156,8 @@ static void handle_data_packet(PrrtSocket *sock_ptr, PrrtPacket *packet, struct
 static void handle_redundancy_packet(PrrtSocket *socket, PrrtPacket *packet) {
     PrrtPacketRedundancyPayload *redundancyPayload = packet->payload;
 
+    PrrtReceptionTable_mark_received(socket->redundancyReceptionTable, packet->sequenceNumber);
+
     if (!PrrtDeliveredPacketTable_test_is_block_relevant(socket->deliveredPacketTable,
                                                          redundancyPayload->baseSequenceNumber,
                                                          redundancyPayload->n)) {

prrt/proto/processes/feedbackReceiver.c

@@ -37,10 +37,12 @@ static void handle_feedback(PrrtSocket *prrtSocket, const size_t length)
     check_mem(prrtPacket);
     PrrtPacket_decode(bufin, (uint16_t) n, prrtPacket);
 
-    prrtTimestamp_t forwardTripTimestamp = ((PrrtPacketFeedbackPayload *) prrtPacket->payload)->forwardTripTimestamp_us;
+    PrrtPacketFeedbackPayload *feedbackPayload = (PrrtPacketFeedbackPayload *) prrtPacket->payload;
+    prrtTimestamp_t forwardTripTimestamp = feedbackPayload->forwardTripTimestamp_us;
 
     PrrtChannelStateInformation_update_rtprop(prrtSocket->receiver->csi,
                                               (prrtTimedelta_t) (receiveTime - forwardTripTimestamp));
+    PrrtChannelStateInformation_update_plr(prrtSocket->receiver->csi, feedbackPayload->erasureCount, feedbackPayload->packetCount);
 
     error:
     if(prrtPacket != NULL) { PrrtPacket_destroy(prrtPacket); }

prrt/proto/socket.c

@@ -104,6 +104,9 @@ PrrtSocket *PrrtSocket_create(const bool is_sender, prrtTimedelta_t target_delay
         s->repairBlockStore = PrrtRepairBlockStore_create();
 
         s->packetDeliveryStore = PrrtPacketDeliveryStore_create();
+
+        s->dataReceptionTable = PrrtReceptionTable_create();
+        s->redundancyReceptionTable = PrrtReceptionTable_create();
     }
 
     return s;
@@ -423,6 +426,16 @@ int PrrtSocket_close(PrrtSocket *s) {
         s->sendDataQueue = NULL;
     }
 
+    if (s->dataReceptionTable != NULL) {
+        PrrtReceptionTable_destroy(s->dataReceptionTable);
+        s->dataReceptionTable = NULL;
+    }
+
+    if (s->redundancyReceptionTable != NULL) {
+        PrrtReceptionTable_destroy(s->redundancyReceptionTable);
+        s->redundancyReceptionTable = NULL;
+    }
+
     if (s->packetDeliveryStore != NULL) {
         PrrtPacketDeliveryStore_destroy(s->packetDeliveryStore);
         s->packetDeliveryStore = NULL;
@@ -549,6 +562,8 @@ bool PrrtSocket_cleanup(PrrtSocket *s) {
             PrrtRepairBlockStore_expire_block_range(s->repairBlockStore, (prrtSequenceNumber_t) (current_start - SEQNO_SPACE/2),
                                                     (prrtSequenceNumber_t) (current_start - 1));
         }
+
+        s->lossStatistics = PrrtLossStatistics_add(PrrtReceptionTable_calculate_statistics(s->dataReceptionTable), PrrtReceptionTable_calculate_statistics(s->redundancyReceptionTable));
     }
     return true;
 }
@@ -560,3 +575,7 @@ bool PrrtSocket_uses_thread_pinning(PrrtSocket *s) {
 uint32_t PrrtSocket_get_rtprop(PrrtSocket *s) {
     return PrrtChannelStateInformation_get_rtprop(s->receiver->csi);
 }
+
+prrtPacketLossRate_t PrrtSocket_get_plr(PrrtSocket *socket) {
+    return PrrtChannelStateInformation_get_plr(socket->receiver->csi);
+}

prrt/proto/socket.h

@@ -13,8 +13,10 @@
 #include "stores/dataPacketStore.h"
 #include "stores/deliveredPacketTable.h"
 #include "stores/packetTimeoutTable.h"
+#include "stores/receptionTable.h"
 #include "stores/repairBlockStore.h"
 #include "stores/packetDeliveryStore.h"
+#include "types/lossStatistics.h"
 #include "clock.h"
 #include "../xlap/xlap.h"
 #include "receiver.h"
@@ -62,6 +64,11 @@ typedef struct prrtSocket {
     prrtTimestamp_t lastSentTimestamp;
     prrtTimestamp_t lastReceivedTimestamp;
 
+    PrrtLossStatistics lossStatistics;
+
+    PrrtReceptionTable* dataReceptionTable;
+    PrrtReceptionTable* redundancyReceptionTable;
+
     PrrtApplicationConstraints *applicationConstraints;
 
     PrrtCodingParams *codingParameters;
@@ -122,4 +129,6 @@ bool PrrtSocket_uses_thread_pinning(PrrtSocket *s);
 
 uint32_t PrrtSocket_get_rtprop(PrrtSocket *s);
 
+prrtPacketLossRate_t PrrtSocket_get_plr(PrrtSocket *socket);
+
 #endif // PRRT_SOCKET_H

prrt/proto/stores/deliveredPacketTable.h

@@ -5,6 +5,7 @@
 #include <stdbool.h>
 #include "../packet.h"
 #include "../../util/bitmap.h"
+#include "../types/lossStatistics.h"
 
 typedef struct {
     prrtSequenceNumber_t start;
@@ -22,4 +23,5 @@ bool PrrtDeliveredPacketTable_test_is_block_relevant(PrrtDeliveredPacketTable *t
 
 void PrrtDeliveredPacketTable_forward_start(PrrtDeliveredPacketTable *fpt_ptr, prrtSequenceNumber_t new_start);
 
+
 #endif //PRRT_DELIVERED_PACKET_TABLE_H

prrt/proto/stores/lossGatherer.c

-#include <stddef.h>
-#include <malloc.h>
-#include "../../defines.h"
-#include "../../util/common.h"
-#include "../../util/dbg.h"
-#include "lossGatherer.h"
-
-LossGatherer *LossGatherer_create()
-{
-    LossGatherer *lg = calloc(1, sizeof(LossGatherer));
-    check_mem(lg);
-    lg->bitmap = Bitmap_create(false, SEQNO_SPACE);
-
-    return lg;
-    error:
-    PERROR("Could not create loss gatherer.%s", "");
-    return NULL;
-}
-
-bool LossGatherer_destroy(LossGatherer *lossGatherer)
-{
-    Bitmap_destroy(lossGatherer->bitmap);
-    free(lossGatherer);
-    return true;
-}
-
-LossStatistics LossGatherer_calculate_statistics(LossGatherer *lossGatherer, uint32_t start, uint16_t length)
-{
-    check(length != 0, "Cannot calculate stats over empty sequence.");
-
-    bool x0 = LossGatherer_check_loss(lossGatherer, start);
-    LossStatistics statistics = {
-            .errorCount = (uint16_t) x0,
-            .packetCount = length,
-            .gapCount = (uint16_t) x0,
-            .burstCount = (uint16_t) (1 - ((uint16_t) x0)),
-    };
-    statistics.gapLength = statistics.gapCount;
-    statistics.burstLength = statistics.burstCount;
-
-    bool isInGap = x0;
-    uint16_t i = 0;
-
-    for(i = 1; i < length; i++) {
-        bool currentPosition = LossGatherer_check_loss(lossGatherer, start + i);
-        statistics.errorCount += currentPosition;
-        if(isInGap && currentPosition) {
-            statistics.gapLength++;
-        } else if(isInGap && (currentPosition == false)) {
-            isInGap = false;
-            statistics.burstCount++;
-            statistics.burstLength++;
-        } else if((isInGap == false) && currentPosition) {
-            isInGap = true;
-            statistics.gapCount++;
-            statistics.gapLength++;
-        } else {
-            statistics.burstLength++;
-        }
-    }
-    return statistics;
-
-    error:
-        PERROR("Stats error.%s","");
-        LossStatistics ls;
-        return ls;
-}
-
-bool LossGatherer_check_loss(LossGatherer *lossGatherer, uint32_t sequenceNumber)
-{
-    return Bitmap_get(lossGatherer->bitmap, sequenceNumber);
-}
-
-
-bool LossGatherer_mark_loss(LossGatherer *lossGatherer, uint32_t sequenceNumber)
-{
-    return Bitmap_set(lossGatherer->bitmap, sequenceNumber, true);
-}

prrt/proto/stores/receptionTable.c

+#include "../../defines.h"
+#include "../../util/common.h"
+#include "../../util/dbg.h"
+#include "receptionTable.h"
+
+PrrtReceptionTable *PrrtReceptionTable_create(void) {
+    PrrtReceptionTable* t = calloc(1, sizeof(PrrtReceptionTable));
+    check_mem(t);
+    t->start = 0;
+    t->maxNumberInWindow = 0;
+    t->windowSize = 1000;
+    t->bitmap = Bitmap_create(false, SEQNO_SPACE);
+
+    pthread_mutexattr_t attr;
+    check(pthread_mutexattr_init(&attr) == EXIT_SUCCESS, "Mutex attr init failed.");
+    check(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == EXIT_SUCCESS, "Setting type failed.");
+    check(pthread_mutex_init(&t->lock, &attr) == 0, "Mutex init failed.");
+
+    return t;
+
+    error:
+    PERROR("Out of memory.%s", "");
+    return NULL;
+}
+
+bool PrrtReceptionTable_destroy(PrrtReceptionTable *t) {
+    pthread_mutex_destroy(&t->lock);
+    Bitmap_destroy(t->bitmap);
+    free(t);
+    return true;
+}
+
+bool PrrtReceptionTable_mark_received(PrrtReceptionTable *t, prrtSequenceNumber_t markedNumber) {
+    check(pthread_mutex_lock(&t->lock) == EXIT_SUCCESS, "Lock failed.");
+    prrtSequenceNumber_t markedNumber_relative = (prrtSequenceNumber_t) (markedNumber - t->start);
+    prrtSequenceNumber_t maxNumberInWindow_relative = (prrtSequenceNumber_t) (t->maxNumberInWindow - t->start);
+
+    if (markedNumber_relative < t->windowSize) {
+        Bitmap_set_1(t->bitmap, markedNumber);
+        if(markedNumber_relative > maxNumberInWindow_relative) {
+            t->maxNumberInWindow = markedNumber;
+        }
+    }
+
+    if(markedNumber_relative > (t->windowSize/2)) {
+        prrtSequenceNumber_t new_start = (prrtSequenceNumber_t) (markedNumber - (t->windowSize / 2));
+        Bitmap_set_range_0(t->bitmap, t->start, (prrtSequenceNumber_t ) (new_start - t->start));
+        t->start = new_start;
+    }
+    check(pthread_mutex_unlock(&t->lock) == EXIT_SUCCESS, "Lock failed.");
+
+    return 0;
+
+    error:
+    PERROR("PrrtReceptionTable_mark_received failed%s.", "");
+    return false;
+}
+
+PrrtLossStatistics PrrtReceptionTable_calculate_statistics(PrrtReceptionTable *t) {
+    check(pthread_mutex_lock(&t->lock) == EXIT_SUCCESS, "Lock failed.");
+    prrtSequenceNumber_t length = (prrtSequenceNumber_t) ((t->maxNumberInWindow - t->start) + 1);
+    bool x0 = Bitmap_get(t->bitmap, t->start) == false;
+    PrrtLossStatistics statistics = {
+            .erasureCount = (uint16_t) x0,
+            .packetCount = length,
+            .gapCount = (uint16_t) x0,
+            .burstCount = (uint16_t) (1 - ((uint16_t) x0)),
+    };
+    statistics.gapLength = statistics.gapCount;
+    statistics.burstLength = statistics.burstCount;
+    bool isInGap = x0;
+    uint16_t i = 0;
+    for(i = 1; i < length; i++) {
+        bool currentPosition = Bitmap_get(t->bitmap, t->start + i) == false;
+        statistics.erasureCount += currentPosition;
+        if(isInGap && currentPosition) {
+            statistics.gapLength++;
+        } else if(isInGap && (currentPosition == false)) {
+            isInGap = false;
+            statistics.burstCount++;
+            statistics.burstLength++;
+        } else if((isInGap == false) && currentPosition) {
+            isInGap = true;
+            statistics.gapCount++;
+            statistics.gapLength++;
+        } else {
+            statistics.burstLength++;
+        }
+    }
+    check(pthread_mutex_unlock(&t->lock) == EXIT_SUCCESS, "Lock failed.");
+    return statistics;
+
+    error:
+    PERROR("PrrtReceptionTable_calculate_statistics failed%s.", "");
+    return statistics;
+
+}

prrt/proto/stores/receptionTable.h

+#ifndef PRRT_RECEPTIONTABLE_H
+#define PRRT_RECEPTIONTABLE_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "../packet.h"
+#include "../../util/bitmap.h"
+#include "../types/lossStatistics.h"
+
+
+typedef struct {
+    prrtSequenceNumber_t start;
+    Bitmap* bitmap;
+    prrtSequenceNumber_t maxNumberInWindow;
+    prrtSequenceNumber_t windowSize;
+    pthread_mutex_t lock;
+} PrrtReceptionTable;
+
+PrrtReceptionTable * PrrtReceptionTable_create(void);
+bool PrrtReceptionTable_mark_received(PrrtReceptionTable* t, prrtSequenceNumber_t markedNumber);
+PrrtLossStatistics PrrtReceptionTable_calculate_statistics(PrrtReceptionTable *lossGatherer);
+bool PrrtReceptionTable_destroy(PrrtReceptionTable * t);
+
+
+#endif //PRRT_RECEPTIONTABLE_H

prrt/proto/types/lossStatistics.c

+#include "lossStatistics.h"
+
+PrrtLossStatistics PrrtLossStatistics_add(PrrtLossStatistics a, PrrtLossStatistics b) {
+    PrrtLossStatistics result;
+    result.packetCount = a.packetCount + b.packetCount;
+    result.erasureCount = a.erasureCount + b.erasureCount;
+    result.burstCount = a.burstCount + b.burstCount;
+    result.burstLength = a.burstLength + b.burstLength;
+    result.gapCount = a.gapCount + b.gapCount;
+    result.gapLength = a.gapLength + b.gapLength;
+    return result;
+}

prrt/proto/stores/lossGatherer.h → prrt/proto/types/lossStatistics.h

-#ifndef PRRT_LOSSGATHERER_H
-#define PRRT_LOSSGATHERER_H
+#ifndef PRRT_LOSS_STATISTICS_H
+#define PRRT_LOSS_STATISTICS_H
 
-#include "../../util/bitmap.h"
-
-typedef struct lossGatherer {
-    Bitmap* bitmap;
-    uint16_t start;
-} LossGatherer;
+#include <stdint.h>
 
 typedef struct lossStatistics {
     uint16_t packetCount;
-    uint16_t errorCount;
+    uint16_t erasureCount;
     uint16_t gapLength;
     uint16_t gapCount;
     uint16_t burstLength;
     uint16_t burstCount;
-} LossStatistics;
+} PrrtLossStatistics;
 
-LossGatherer* LossGatherer_create(void);
-LossStatistics LossGatherer_calculate_statistics(LossGatherer *lossGatherer, uint32_t start, uint16_t length);
-bool LossGatherer_mark_loss(LossGatherer* lossGatherer, uint32_t sequenceNumber);
-bool LossGatherer_check_loss(LossGatherer *lossGatherer, uint32_t sequenceNumber);
-bool LossGatherer_destroy(LossGatherer* lossGatherer);
+PrrtLossStatistics PrrtLossStatistics_add(PrrtLossStatistics a, PrrtLossStatistics b);
 
-#define LossStatistics_get_packet_loss_rate(stats) (((float) stats.errorCount) / stats.packetCount)
+#define LossStatistics_get_packet_loss_rate(stats) (((float) stats.erasureCount) / stats.packetCount)
 #define LossStatistics_get_avg_gap_length(stats) (((float) stats.gapLength) / stats.gapCount)
 #define LossStatistics_get_avg_burst_length(stats) (((float) stats.burstLength) / stats.burstCount)
 
-#endif //PRRT_LOSSGATHERER_H
+#endif //PRRT_LOSS_STATISTICS_H
\ No newline at end of file

prrt/prrt.pyx

@@ -12,7 +12,10 @@ cdef extern from "proto/stores/dataPacketStore.c":
 cdef extern from "proto/stores/deliveredPacketTable.c":
     pass
 
-cdef extern from "proto/stores/lossGatherer.c":
+cdef extern from "proto/stores/receptionTable.c":
+    pass
+
+cdef extern from "proto/stores/packetTimeoutTable.c":
     pass
 
 cdef extern from "proto/stores/packetTimeoutTable.c":
@@ -27,6 +30,9 @@ cdef extern from "proto/stores/packetDeliveryStore.c":
 cdef extern from "proto/types/packetTimeout.c":
     pass
 
+cdef extern from "proto/types/lossStatistics.c":
+    pass
+
 cdef extern from "proto/processes/feedbackReceiver.c":
     pass
 
@@ -121,6 +127,13 @@ cdef class PrrtSocket:
 
         self.isSender = isSender
 
+    property plr:
+
+        def __get__(self):
+            if not self.isSender:
+                raise Exception("Not a sender.")
+            return cprrt.PrrtSocket_get_plr(self._c_socket)
+
     property thread_pinning:
 
         def __get__(self):

tests/CMakeLists.txt

 add_subdirectory(lib/gtest-1.8.0)
 include_directories(SYSTEM ${gtest_SOURCE_DIR}/include ${gtest_SOURCE_DIR})
 
-add_executable(prrtTests bitmap_tests.cpp lossGatherer_tests.cpp delivered_packet_table_tests.cpp bptree_tests.cpp PrrtBlock_tests.cpp)
+add_executable(prrtTests bitmap_tests.cpp receptionTable_tests.cpp delivered_packet_table_tests.cpp bptree_tests.cpp PrrtBlock_tests.cpp)
 target_link_libraries(prrtTests LINK_PUBLIC gtest PRRT UTIL gtest_main)
\ No newline at end of file

tests/lossGatherer_tests.cpp

-#include <gtest/gtest.h>
-
-extern "C" {
-#include "prrt/proto/stores/lossGatherer.h"
-}
-
-class LossGathererTest : public ::testing::Test {
-protected:
-    virtual void SetUp()
-    {
-        lg = LossGatherer_create();
-    }
-
-    virtual void TearDown()
-    {
-        LossGatherer_destroy(lg);
-    }
-
-    LossGatherer *lg;
-};
-
-TEST_F(LossGathererTest, CreateDestroy)
-{
-    LossGatherer *lg = LossGatherer_create();
-    void *n = NULL;
-    ASSERT_NE(n, lg);
-    ASSERT_NE(n, lg->bitmap);
-    LossGatherer_destroy(lg);
-}
-
-TEST_F(LossGathererTest, CheckLoss)
-{
-    ASSERT_FALSE(LossGatherer_check_loss(lg