recv_thread.c

   1 #include <assert.h>
   2 #include <dragonnet/peer.h>
   3 #include <dragonnet/recv.h>
   4 #include <dragonnet/recv_thread.h>
   5 #include <dragontype/number.h>
   6 #include <pthread.h>
   7 #include <stdbool.h>
   8 #include <stdio.h>
   9 #include <unistd.h>
  10
  11 void *dragonnet_peer_recv_thread(void *g_peer)
  12 {
  13         DragonnetPeer *p = (DragonnetPeer *) g_peer;
  14
  15         pthread_rwlock_wrlock(&p->mu);
  16         assert(p->state == DRAGONNET_PEER_CREATED);
  17         p->state++;
  18         pthread_rwlock_unlock(&p->mu);
  19
  20         while (true) {
  21                 u16 type_id;
  22
  23                 // Copy socket fd so that shutdown doesn't block
  24                 pthread_rwlock_rdlock(&p->mu);
  25                 int sock = p->sock;
  26                 pthread_rwlock_unlock(&p->mu);
  27
  28                 ssize_t len = recv(sock, &type_id, sizeof type_id, MSG_WAITALL);
  29                 if (len < 0) {
  30                         perror("recv");
  31                         dragonnet_peer_delete(p);
  32                         return NULL;
  33                 }
  34
  35                 // Connection closed
  36                 if (len == 0) {
  37                         pthread_rwlock_wrlock(&p->mu);
  38
  39                         close(p->sock);
  40                         p->sock = -1;
  41                         p->state++;
  42
  43                         pthread_rwlock_unlock(&p->mu);
  44                         return NULL;
  45                 }
  46
  47                 type_id = be16toh(type_id);
  48                 DragonnetType type = dragonnet_types[type_id];
  49                 u8 buf[type.siz];
  50                 type.deserialize(p, buf);
  51
  52                 pthread_rwlock_rdlock(&p->mu);
  53                 bool (*on_recv)(struct dragonnet_peer *, u16, void *) = p->on_recv;
  54                 void (*on_recv_type)(DragonnetPeer *, void *) = p->on_recv_type[type_id];
  55                 pthread_rwlock_unlock(&p->mu);
  56
  57                 if (on_recv != NULL && !on_recv(p, type, buf))
  58                         on_recv_type = NULL;
  59
  60                 if (on_recv_type != NULL)
  61                         on_recv_type(p, buf);
  62         }
  63 }