From 806df1c7645fdcfc945fb9e1467ea7aaada2b903 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?IOhannes=20m=20zm=C3=B6lnig?=
 <zmoelnig@users.sourceforge.net>
Date: Tue, 30 Mar 2010 07:36:07 +0000
Subject: split core library into separate files

svn path=/trunk/externals/iem/iemnet/; revision=13310
---
 iemnet_sender.c | 164 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 iemnet_sender.c

(limited to 'iemnet_sender.c')

diff --git a/iemnet_sender.c b/iemnet_sender.c
new file mode 100644
index 0000000..eb1ec3b
--- /dev/null
+++ b/iemnet_sender.c
@@ -0,0 +1,164 @@
+/* iemnet
+ *
+ * sender
+ *   sends data "chunks" to a socket
+ *   possibly threaded
+ *
+ *  copyright (c) 2010 IOhannes m zmölnig, IEM
+ */
+
+//#define DEBUG
+
+#include "iemnet.h"
+#include "iemnet_data.h"
+
+
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include <sys/types.h>
+
+#ifdef _WIN32
+# include <winsock2.h>
+# include <ws2tcpip.h> /* for socklen_t */
+#else
+# include <sys/socket.h>
+#endif
+
+#include <pthread.h>
+
+
+ /* draft:
+  *   - there is a sender thread for each open connection
+  *   - the main thread just adds chunks to each sender threads processing queue
+  *   - the sender thread tries to send the queue as fast as possible
+  */
+
+struct _iemnet_sender {
+  pthread_t thread;
+
+  int sockfd; /* owned outside; must call iemnet__sender_destroy() before freeing socket yourself */
+  t_iemnet_queue*queue;
+  int keepsending; // indicates whether we want to thread to continue or to terminate
+  int isrunning;
+};
+
+/* the workhorse of the family */
+
+static int iemnet__sender_dosend(int sockfd, t_iemnet_queue*q) {
+  t_iemnet_chunk*c=queue_pop_block(q);
+  if(c) {
+    unsigned char*data=c->data;
+    unsigned int size=c->size;
+    int result=-1;
+    //    fprintf(stderr, "sending %d bytes at %x to %d\n", size, data, sockfd);
+    DEBUG("sending %d bytes", size);
+    result = send(sockfd, data, size, 0);
+    if(result<0) {
+      // broken pipe
+      return 0;
+    }
+
+    // shouldn't we do something with the result here?
+    DEBUG("sent %d bytes", result);
+    iemnet__chunk_destroy(c);
+  } else {
+    return 0;
+  }
+  return 1;
+}
+
+static void*iemnet__sender_sendthread(void*arg) {
+  t_iemnet_sender*sender=(t_iemnet_sender*)arg;
+
+  int sockfd=sender->sockfd;
+  t_iemnet_queue*q=sender->queue;
+
+  while(sender->keepsending) {
+    if(!iemnet__sender_dosend(sockfd, q))break;
+  }
+  sender->isrunning=0;
+  DEBUG("send thread terminated");
+  return NULL;
+}
+
+int iemnet__sender_send(t_iemnet_sender*s, t_iemnet_chunk*c) {
+  t_iemnet_queue*q=s->queue;
+  int size=-1;
+  if(!s->isrunning)return -1;
+  if(q) {
+    t_iemnet_chunk*chunk=iemnet__chunk_create_chunk(c);
+    size = queue_push(q, chunk);
+  }
+  return size;
+}
+
+void iemnet__sender_destroy(t_iemnet_sender*s) {
+  /* simple protection against recursive calls:
+   * s->keepsending is only set to "0" in here, 
+   * so if it is false, we know that we are already being called
+   */
+  if(!s->keepsending)return;
+
+  DEBUG("destroy sender %x", s);
+  s->keepsending=0;
+  queue_finish(s->queue);
+  DEBUG("queue finished");
+  s->sockfd = -1;
+  pthread_join(s->thread, NULL);
+  DEBUG("thread joined");
+  queue_destroy(s->queue);
+  freebytes(s, sizeof(t_iemnet_sender));
+  s=NULL;
+  DEBUG("destroyed sender");
+}
+t_iemnet_sender*iemnet__sender_create(int sock) {
+  t_iemnet_sender*result=(t_iemnet_sender*)getbytes(sizeof(t_iemnet_sender));
+  int res=0;
+  DEBUG("create sender %x", result);
+  if(NULL==result){
+    DEBUG("create sender failed");
+    return NULL;
+  }
+
+  result->queue = queue_create();
+  result->sockfd = sock;
+  result->keepsending =1;
+  result->isrunning=1;
+
+  res=pthread_create(&result->thread, 0, iemnet__sender_sendthread, result);
+
+  if(0==res) {
+
+  } else {
+    // something went wrong
+  }
+
+  DEBUG("created sender");
+  return result;
+}
+
+int iemnet__sender_getlasterror(t_iemnet_sender*x) {
+  x=NULL;
+#ifdef _WIN32
+  return WSAGetLastError();
+#endif
+  return errno;
+}
+
+
+int iemnet__sender_getsockopt(t_iemnet_sender*s, int level, int optname, void      *optval, socklen_t*optlen) {
+  int result=getsockopt(s->sockfd, level, optname, optval, optlen);
+  if(result!=0) {
+    post("%s: getsockopt returned %d", __FUNCTION__, iemnet__sender_getlasterror(s));
+  }
+  return result;
+}
+int iemnet__sender_setsockopt(t_iemnet_sender*s, int level, int optname, const void*optval, socklen_t optlen) {
+  int result=setsockopt(s->sockfd, level, optname, optval, optlen);
+  if(result!=0) {
+    post("%s: setsockopt returned %d", __FUNCTION__, iemnet__sender_getlasterror(s));
+  }
+  return result;
+}
-- 
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