diff --git a/libknet/threads_tx.c b/libknet/threads_tx.c index 3969b109..3462cf70 100644 --- a/libknet/threads_tx.c +++ b/libknet/threads_tx.c @@ -1,783 +1,782 @@ /* * Copyright (C) 2012-2019 Red Hat, Inc. All rights reserved. * * Authors: Fabio M. Di Nitto * Federico Simoncelli * * This software licensed under LGPL-2.0+ */ #include "config.h" #include #include #include #include #include #include #include "compat.h" #include "compress.h" #include "crypto.h" #include "host.h" #include "link.h" #include "logging.h" #include "transports.h" #include "transport_common.h" #include "threads_common.h" #include "threads_heartbeat.h" #include "threads_tx.h" #include "netutils.h" /* * SEND */ static int _dispatch_to_links(knet_handle_t knet_h, struct knet_host *dst_host, struct knet_mmsghdr *msg, int msgs_to_send) { int link_idx, msg_idx, sent_msgs, prev_sent, progress; int err = 0, savederrno = 0; unsigned int i; struct knet_mmsghdr *cur; struct knet_link *cur_link; for (link_idx = 0; link_idx < dst_host->active_link_entries; link_idx++) { prev_sent = 0; progress = 1; cur_link = &dst_host->link[dst_host->active_links[link_idx]]; if (cur_link->transport == KNET_TRANSPORT_LOOPBACK) { continue; } msg_idx = 0; while (msg_idx < msgs_to_send) { msg[msg_idx].msg_hdr.msg_name = &cur_link->dst_addr; /* Cast for Linux/BSD compatibility */ for (i=0; i<(unsigned int)msg[msg_idx].msg_hdr.msg_iovlen; i++) { cur_link->status.stats.tx_data_bytes += msg[msg_idx].msg_hdr.msg_iov[i].iov_len; } cur_link->status.stats.tx_data_packets++; msg_idx++; } retry: cur = &msg[prev_sent]; sent_msgs = _sendmmsg(dst_host->link[dst_host->active_links[link_idx]].outsock, transport_get_connection_oriented(knet_h, dst_host->link[dst_host->active_links[link_idx]].transport), &cur[0], msgs_to_send - prev_sent, MSG_DONTWAIT | MSG_NOSIGNAL); savederrno = errno; err = transport_tx_sock_error(knet_h, dst_host->link[dst_host->active_links[link_idx]].transport, dst_host->link[dst_host->active_links[link_idx]].outsock, sent_msgs, savederrno); switch(err) { case -1: /* unrecoverable error */ cur_link->status.stats.tx_data_errors++; goto out_unlock; break; case 0: /* ignore error and continue */ break; case 1: /* retry to send those same data */ cur_link->status.stats.tx_data_retries++; goto retry; break; } prev_sent = prev_sent + sent_msgs; if ((sent_msgs >= 0) && (prev_sent < msgs_to_send)) { if ((sent_msgs) || (progress)) { if (sent_msgs) { progress = 1; } else { progress = 0; } #ifdef DEBUG log_debug(knet_h, KNET_SUB_TX, "Unable to send all (%d/%d) data packets to host %s (%u) link %s:%s (%u)", sent_msgs, msg_idx, dst_host->name, dst_host->host_id, dst_host->link[dst_host->active_links[link_idx]].status.dst_ipaddr, dst_host->link[dst_host->active_links[link_idx]].status.dst_port, dst_host->link[dst_host->active_links[link_idx]].link_id); #endif goto retry; } if (!progress) { savederrno = EAGAIN; err = -1; goto out_unlock; } } if ((dst_host->link_handler_policy == KNET_LINK_POLICY_RR) && (dst_host->active_link_entries > 1)) { uint8_t cur_link_id = dst_host->active_links[0]; memmove(&dst_host->active_links[0], &dst_host->active_links[1], KNET_MAX_LINK - 1); dst_host->active_links[dst_host->active_link_entries - 1] = cur_link_id; break; } } out_unlock: errno = savederrno; return err; } static int _parse_recv_from_sock(knet_handle_t knet_h, size_t inlen, int8_t channel, int is_sync) { size_t outlen, frag_len; struct knet_host *dst_host; knet_node_id_t dst_host_ids_temp[KNET_MAX_HOST]; size_t dst_host_ids_entries_temp = 0; knet_node_id_t dst_host_ids[KNET_MAX_HOST]; size_t dst_host_ids_entries = 0; int bcast = 1; struct knet_hostinfo *knet_hostinfo; struct iovec iov_out[PCKT_FRAG_MAX][2]; int iovcnt_out = 2; uint8_t frag_idx; unsigned int temp_data_mtu; size_t host_idx; int send_mcast = 0; struct knet_header *inbuf; int savederrno = 0; int err = 0; seq_num_t tx_seq_num; struct knet_mmsghdr msg[PCKT_FRAG_MAX]; int msgs_to_send, msg_idx; unsigned int i; int j; int send_local = 0; int data_compressed = 0; size_t uncrypted_frag_size; inbuf = knet_h->recv_from_sock_buf; if ((knet_h->enabled != 1) && (inbuf->kh_type != KNET_HEADER_TYPE_HOST_INFO)) { /* data forward is disabled */ log_debug(knet_h, KNET_SUB_TX, "Received data packet but forwarding is disabled"); savederrno = ECANCELED; err = -1; goto out_unlock; } /* * move this into a separate function to expand on * extra switching rules */ switch(inbuf->kh_type) { case KNET_HEADER_TYPE_DATA: if (knet_h->dst_host_filter_fn) { bcast = knet_h->dst_host_filter_fn( knet_h->dst_host_filter_fn_private_data, (const unsigned char *)inbuf->khp_data_userdata, inlen, KNET_NOTIFY_TX, knet_h->host_id, knet_h->host_id, &channel, dst_host_ids_temp, &dst_host_ids_entries_temp); if (bcast < 0) { log_debug(knet_h, KNET_SUB_TX, "Error from dst_host_filter_fn: %d", bcast); savederrno = EFAULT; err = -1; goto out_unlock; } if ((!bcast) && (!dst_host_ids_entries_temp)) { log_debug(knet_h, KNET_SUB_TX, "Message is unicast but no dst_host_ids_entries"); savederrno = EINVAL; err = -1; goto out_unlock; } if ((!bcast) && (dst_host_ids_entries_temp > KNET_MAX_HOST)) { log_debug(knet_h, KNET_SUB_TX, "dst_host_filter_fn returned too many destinations"); savederrno = EINVAL; err = -1; goto out_unlock; } } /* Send to localhost if appropriate and enabled */ if (knet_h->has_loop_link) { send_local = 0; if (bcast) { send_local = 1; } else { for (i=0; i< dst_host_ids_entries_temp; i++) { if (dst_host_ids_temp[i] == knet_h->host_id) { send_local = 1; } } } if (send_local) { const unsigned char *buf = inbuf->khp_data_userdata; ssize_t buflen = inlen; struct knet_link *local_link; local_link = knet_h->host_index[knet_h->host_id]->link; local_retry: err = write(knet_h->sockfd[channel].sockfd[knet_h->sockfd[channel].is_created], buf, buflen); if (err < 0) { log_err(knet_h, KNET_SUB_TRANSP_LOOPBACK, "send local failed. error=%s\n", strerror(errno)); local_link->status.stats.tx_data_errors++; } if (err > 0 && err < buflen) { log_debug(knet_h, KNET_SUB_TRANSP_LOOPBACK, "send local incomplete=%d bytes of %zu\n", err, inlen); local_link->status.stats.tx_data_retries++; buf += err; buflen -= err; - usleep(KNET_THREADS_TIMERES / 16); goto local_retry; } if (err == buflen) { local_link->status.stats.tx_data_packets++; local_link->status.stats.tx_data_bytes += inlen; } } } break; case KNET_HEADER_TYPE_HOST_INFO: knet_hostinfo = (struct knet_hostinfo *)inbuf->khp_data_userdata; if (knet_hostinfo->khi_bcast == KNET_HOSTINFO_UCAST) { bcast = 0; dst_host_ids_temp[0] = knet_hostinfo->khi_dst_node_id; dst_host_ids_entries_temp = 1; knet_hostinfo->khi_dst_node_id = htons(knet_hostinfo->khi_dst_node_id); } break; default: log_warn(knet_h, KNET_SUB_TX, "Receiving unknown messages from socket"); savederrno = ENOMSG; err = -1; goto out_unlock; break; } if (is_sync) { if ((bcast) || ((!bcast) && (dst_host_ids_entries_temp > 1))) { log_debug(knet_h, KNET_SUB_TX, "knet_send_sync is only supported with unicast packets for one destination"); savederrno = E2BIG; err = -1; goto out_unlock; } } /* * check destinations hosts before spending time * in fragmenting/encrypting packets to save * time processing data for unreachable hosts. * for unicast, also remap the destination data * to skip unreachable hosts. */ if (!bcast) { dst_host_ids_entries = 0; for (host_idx = 0; host_idx < dst_host_ids_entries_temp; host_idx++) { dst_host = knet_h->host_index[dst_host_ids_temp[host_idx]]; if (!dst_host) { continue; } if (!(dst_host->host_id == knet_h->host_id && knet_h->has_loop_link) && dst_host->status.reachable) { dst_host_ids[dst_host_ids_entries] = dst_host_ids_temp[host_idx]; dst_host_ids_entries++; } } if (!dst_host_ids_entries) { savederrno = EHOSTDOWN; err = -1; goto out_unlock; } } else { send_mcast = 0; for (dst_host = knet_h->host_head; dst_host != NULL; dst_host = dst_host->next) { if (!(dst_host->host_id == knet_h->host_id && knet_h->has_loop_link) && dst_host->status.reachable) { send_mcast = 1; break; } } if (!send_mcast) { savederrno = EHOSTDOWN; err = -1; goto out_unlock; } } if (!knet_h->data_mtu) { /* * using MIN_MTU_V4 for data mtu is not completely accurate but safe enough */ log_debug(knet_h, KNET_SUB_TX, "Received data packet but data MTU is still unknown." " Packet might not be delivered." " Assuming minimum IPv4 MTU (%d)", KNET_PMTUD_MIN_MTU_V4); temp_data_mtu = KNET_PMTUD_MIN_MTU_V4; } else { /* * take a copy of the mtu to avoid value changing under * our feet while we are sending a fragmented pckt */ temp_data_mtu = knet_h->data_mtu; } /* * compress data */ if ((knet_h->compress_model > 0) && (inlen > knet_h->compress_threshold)) { size_t cmp_outlen = KNET_DATABUFSIZE_COMPRESS; struct timespec start_time; struct timespec end_time; uint64_t compress_time; clock_gettime(CLOCK_MONOTONIC, &start_time); err = compress(knet_h, (const unsigned char *)inbuf->khp_data_userdata, inlen, knet_h->send_to_links_buf_compress, (ssize_t *)&cmp_outlen); if (err < 0) { log_warn(knet_h, KNET_SUB_COMPRESS, "Compression failed (%d): %s", err, strerror(errno)); } else { /* Collect stats */ clock_gettime(CLOCK_MONOTONIC, &end_time); timespec_diff(start_time, end_time, &compress_time); if (compress_time < knet_h->stats.tx_compress_time_min) { knet_h->stats.tx_compress_time_min = compress_time; } if (compress_time > knet_h->stats.tx_compress_time_max) { knet_h->stats.tx_compress_time_max = compress_time; } knet_h->stats.tx_compress_time_ave = (unsigned long long)(knet_h->stats.tx_compress_time_ave * knet_h->stats.tx_compressed_packets + compress_time) / (knet_h->stats.tx_compressed_packets+1); knet_h->stats.tx_compressed_packets++; knet_h->stats.tx_compressed_original_bytes += inlen; knet_h->stats.tx_compressed_size_bytes += cmp_outlen; if (cmp_outlen < inlen) { memmove(inbuf->khp_data_userdata, knet_h->send_to_links_buf_compress, cmp_outlen); inlen = cmp_outlen; data_compressed = 1; } } } if (knet_h->compress_model > 0 && !data_compressed) { knet_h->stats.tx_uncompressed_packets++; } /* * prepare the outgoing buffers */ frag_len = inlen; frag_idx = 0; inbuf->khp_data_bcast = bcast; inbuf->khp_data_frag_num = ceil((float)inlen / temp_data_mtu); inbuf->khp_data_channel = channel; if (data_compressed) { inbuf->khp_data_compress = knet_h->compress_model; } else { inbuf->khp_data_compress = 0; } if (pthread_mutex_lock(&knet_h->tx_seq_num_mutex)) { log_debug(knet_h, KNET_SUB_TX, "Unable to get seq mutex lock"); goto out_unlock; } knet_h->tx_seq_num++; /* * force seq_num 0 to detect a node that has crashed and rejoining * the knet instance. seq_num 0 will clear the buffers in the RX * thread */ if (knet_h->tx_seq_num == 0) { knet_h->tx_seq_num++; } /* * cache the value in locked context */ tx_seq_num = knet_h->tx_seq_num; inbuf->khp_data_seq_num = htons(knet_h->tx_seq_num); pthread_mutex_unlock(&knet_h->tx_seq_num_mutex); /* * forcefully broadcast a ping to all nodes every SEQ_MAX / 8 * pckts. * this solves 2 problems: * 1) on TX socket overloads we generate extra pings to keep links alive * 2) in 3+ nodes setup, where all the traffic is flowing between node 1 and 2, * node 3+ will be able to keep in sync on the TX seq_num even without * receiving traffic or pings in betweens. This avoids issues with * rollover of the circular buffer */ if (tx_seq_num % (SEQ_MAX / 8) == 0) { _send_pings(knet_h, 0); } if (inbuf->khp_data_frag_num > 1) { while (frag_idx < inbuf->khp_data_frag_num) { /* * set the iov_base */ iov_out[frag_idx][0].iov_base = (void *)knet_h->send_to_links_buf[frag_idx]; iov_out[frag_idx][0].iov_len = KNET_HEADER_DATA_SIZE; iov_out[frag_idx][1].iov_base = inbuf->khp_data_userdata + (temp_data_mtu * frag_idx); /* * set the len */ if (frag_len > temp_data_mtu) { iov_out[frag_idx][1].iov_len = temp_data_mtu; } else { iov_out[frag_idx][1].iov_len = frag_len; } /* * copy the frag info on all buffers */ knet_h->send_to_links_buf[frag_idx]->kh_type = inbuf->kh_type; knet_h->send_to_links_buf[frag_idx]->khp_data_seq_num = inbuf->khp_data_seq_num; knet_h->send_to_links_buf[frag_idx]->khp_data_frag_num = inbuf->khp_data_frag_num; knet_h->send_to_links_buf[frag_idx]->khp_data_bcast = inbuf->khp_data_bcast; knet_h->send_to_links_buf[frag_idx]->khp_data_channel = inbuf->khp_data_channel; knet_h->send_to_links_buf[frag_idx]->khp_data_compress = inbuf->khp_data_compress; frag_len = frag_len - temp_data_mtu; frag_idx++; } iovcnt_out = 2; } else { iov_out[frag_idx][0].iov_base = (void *)inbuf; iov_out[frag_idx][0].iov_len = frag_len + KNET_HEADER_DATA_SIZE; iovcnt_out = 1; } if (knet_h->crypto_instance) { struct timespec start_time; struct timespec end_time; uint64_t crypt_time; frag_idx = 0; while (frag_idx < inbuf->khp_data_frag_num) { clock_gettime(CLOCK_MONOTONIC, &start_time); if (crypto_encrypt_and_signv( knet_h, iov_out[frag_idx], iovcnt_out, knet_h->send_to_links_buf_crypt[frag_idx], (ssize_t *)&outlen) < 0) { log_debug(knet_h, KNET_SUB_TX, "Unable to encrypt packet"); savederrno = ECHILD; err = -1; goto out_unlock; } clock_gettime(CLOCK_MONOTONIC, &end_time); timespec_diff(start_time, end_time, &crypt_time); if (crypt_time < knet_h->stats.tx_crypt_time_min) { knet_h->stats.tx_crypt_time_min = crypt_time; } if (crypt_time > knet_h->stats.tx_crypt_time_max) { knet_h->stats.tx_crypt_time_max = crypt_time; } knet_h->stats.tx_crypt_time_ave = (knet_h->stats.tx_crypt_time_ave * knet_h->stats.tx_crypt_packets + crypt_time) / (knet_h->stats.tx_crypt_packets+1); uncrypted_frag_size = 0; for (j=0; j < iovcnt_out; j++) { uncrypted_frag_size += iov_out[frag_idx][j].iov_len; } knet_h->stats.tx_crypt_byte_overhead += (outlen - uncrypted_frag_size); knet_h->stats.tx_crypt_packets++; iov_out[frag_idx][0].iov_base = knet_h->send_to_links_buf_crypt[frag_idx]; iov_out[frag_idx][0].iov_len = outlen; frag_idx++; } iovcnt_out = 1; } memset(&msg, 0, sizeof(msg)); msgs_to_send = inbuf->khp_data_frag_num; msg_idx = 0; while (msg_idx < msgs_to_send) { msg[msg_idx].msg_hdr.msg_namelen = sizeof(struct sockaddr_storage); msg[msg_idx].msg_hdr.msg_iov = &iov_out[msg_idx][0]; msg[msg_idx].msg_hdr.msg_iovlen = iovcnt_out; msg_idx++; } if (!bcast) { for (host_idx = 0; host_idx < dst_host_ids_entries; host_idx++) { dst_host = knet_h->host_index[dst_host_ids[host_idx]]; err = _dispatch_to_links(knet_h, dst_host, &msg[0], msgs_to_send); savederrno = errno; if (err) { goto out_unlock; } } } else { for (dst_host = knet_h->host_head; dst_host != NULL; dst_host = dst_host->next) { if (dst_host->status.reachable) { err = _dispatch_to_links(knet_h, dst_host, &msg[0], msgs_to_send); savederrno = errno; if (err) { goto out_unlock; } } } } out_unlock: errno = savederrno; return err; } int knet_send_sync(knet_handle_t knet_h, const char *buff, const size_t buff_len, const int8_t channel) { int savederrno = 0, err = 0; if (!knet_h) { errno = EINVAL; return -1; } if (buff == NULL) { errno = EINVAL; return -1; } if (buff_len <= 0) { errno = EINVAL; return -1; } if (buff_len > KNET_MAX_PACKET_SIZE) { errno = EINVAL; return -1; } if (channel < 0) { errno = EINVAL; return -1; } if (channel >= KNET_DATAFD_MAX) { errno = EINVAL; return -1; } savederrno = pthread_rwlock_rdlock(&knet_h->global_rwlock); if (savederrno) { log_err(knet_h, KNET_SUB_TX, "Unable to get read lock: %s", strerror(savederrno)); errno = savederrno; return -1; } if (!knet_h->sockfd[channel].in_use) { savederrno = EINVAL; err = -1; goto out; } savederrno = pthread_mutex_lock(&knet_h->tx_mutex); if (savederrno) { log_err(knet_h, KNET_SUB_TX, "Unable to get TX mutex lock: %s", strerror(savederrno)); err = -1; goto out; } knet_h->recv_from_sock_buf->kh_type = KNET_HEADER_TYPE_DATA; memmove(knet_h->recv_from_sock_buf->khp_data_userdata, buff, buff_len); err = _parse_recv_from_sock(knet_h, buff_len, channel, 1); savederrno = errno; pthread_mutex_unlock(&knet_h->tx_mutex); out: pthread_rwlock_unlock(&knet_h->global_rwlock); errno = err ? savederrno : 0; return err; } static void _handle_send_to_links(knet_handle_t knet_h, struct msghdr *msg, int sockfd, int8_t channel, int type) { ssize_t inlen = 0; int savederrno = 0, docallback = 0; if ((channel >= 0) && (channel < KNET_DATAFD_MAX) && (!knet_h->sockfd[channel].is_socket)) { inlen = readv(sockfd, msg->msg_iov, 1); } else { inlen = recvmsg(sockfd, msg, MSG_DONTWAIT | MSG_NOSIGNAL); } if (inlen == 0) { savederrno = 0; docallback = 1; } else if (inlen < 0) { struct epoll_event ev; savederrno = errno; docallback = 1; memset(&ev, 0, sizeof(struct epoll_event)); if (epoll_ctl(knet_h->send_to_links_epollfd, EPOLL_CTL_DEL, knet_h->sockfd[channel].sockfd[knet_h->sockfd[channel].is_created], &ev)) { log_err(knet_h, KNET_SUB_TX, "Unable to del datafd %d from linkfd epoll pool: %s", knet_h->sockfd[channel].sockfd[0], strerror(savederrno)); } else { knet_h->sockfd[channel].has_error = 1; } } else { knet_h->recv_from_sock_buf->kh_type = type; _parse_recv_from_sock(knet_h, inlen, channel, 0); } if (docallback) { knet_h->sock_notify_fn(knet_h->sock_notify_fn_private_data, knet_h->sockfd[channel].sockfd[0], channel, KNET_NOTIFY_TX, inlen, savederrno); } } void *_handle_send_to_links_thread(void *data) { knet_handle_t knet_h = (knet_handle_t) data; struct epoll_event events[KNET_EPOLL_MAX_EVENTS]; int i, nev, type; int flush, flush_queue_limit; int8_t channel; struct iovec iov_in; struct msghdr msg; struct sockaddr_storage address; set_thread_status(knet_h, KNET_THREAD_TX, KNET_THREAD_STARTED); memset(&iov_in, 0, sizeof(iov_in)); iov_in.iov_base = (void *)knet_h->recv_from_sock_buf->khp_data_userdata; iov_in.iov_len = KNET_MAX_PACKET_SIZE; memset(&msg, 0, sizeof(struct msghdr)); msg.msg_name = &address; msg.msg_namelen = sizeof(struct sockaddr_storage); msg.msg_iov = &iov_in; msg.msg_iovlen = 1; knet_h->recv_from_sock_buf->kh_version = KNET_HEADER_VERSION; knet_h->recv_from_sock_buf->khp_data_frag_seq = 0; knet_h->recv_from_sock_buf->kh_node = htons(knet_h->host_id); for (i = 0; i < PCKT_FRAG_MAX; i++) { knet_h->send_to_links_buf[i]->kh_version = KNET_HEADER_VERSION; knet_h->send_to_links_buf[i]->khp_data_frag_seq = i + 1; knet_h->send_to_links_buf[i]->kh_node = htons(knet_h->host_id); } flush_queue_limit = 0; while (!shutdown_in_progress(knet_h)) { nev = epoll_wait(knet_h->send_to_links_epollfd, events, KNET_EPOLL_MAX_EVENTS + 1, KNET_THREADS_TIMERES / 1000); flush = get_thread_flush_queue(knet_h, KNET_THREAD_TX); /* * we use timeout to detect if thread is shutting down */ if (nev == 0) { /* * ideally we want to communicate that we are done flushing * the queue when we have an epoll timeout event */ if (flush == KNET_THREAD_QUEUE_FLUSH) { set_thread_flush_queue(knet_h, KNET_THREAD_TX, KNET_THREAD_QUEUE_FLUSHED); flush_queue_limit = 0; } continue; } /* * fall back in case the TX sockets will continue receive traffic * and we do not hit an epoll timeout. * * allow up to a 100 loops to flush queues, then we give up. * there might be more clean ways to do it by checking the buffer queue * on each socket, but we have tons of sockets and calculations can go wrong. * Also, why would you disable data forwarding and still send packets? */ if (flush == KNET_THREAD_QUEUE_FLUSH) { if (flush_queue_limit >= 100) { log_debug(knet_h, KNET_SUB_TX, "Timeout flushing the TX queue, expect packet loss"); set_thread_flush_queue(knet_h, KNET_THREAD_TX, KNET_THREAD_QUEUE_FLUSHED); flush_queue_limit = 0; } else { flush_queue_limit++; } } else { flush_queue_limit = 0; } if (pthread_rwlock_rdlock(&knet_h->global_rwlock) != 0) { log_debug(knet_h, KNET_SUB_TX, "Unable to get read lock"); continue; } for (i = 0; i < nev; i++) { if (events[i].data.fd == knet_h->hostsockfd[0]) { type = KNET_HEADER_TYPE_HOST_INFO; channel = -1; } else { type = KNET_HEADER_TYPE_DATA; for (channel = 0; channel < KNET_DATAFD_MAX; channel++) { if ((knet_h->sockfd[channel].in_use) && (knet_h->sockfd[channel].sockfd[knet_h->sockfd[channel].is_created] == events[i].data.fd)) { break; } } if (channel >= KNET_DATAFD_MAX) { log_debug(knet_h, KNET_SUB_TX, "No available channels"); continue; /* channel not found */ } } if (pthread_mutex_lock(&knet_h->tx_mutex) != 0) { log_debug(knet_h, KNET_SUB_TX, "Unable to get mutex lock"); continue; } _handle_send_to_links(knet_h, &msg, events[i].data.fd, channel, type); pthread_mutex_unlock(&knet_h->tx_mutex); } pthread_rwlock_unlock(&knet_h->global_rwlock); } set_thread_status(knet_h, KNET_THREAD_TX, KNET_THREAD_STOPPED); return NULL; }