1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/* 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) {
int sockfd=s->sockfd;
/* 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;
if(sockfd>=0) {
shutdown(sockfd, 2); /* needed on linux, since the recv won't shutdown on sys_closesocket() alone */
sys_closesocket(sockfd);
}
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;
}
int iemnet__sender_getsize(t_iemnet_sender*x) {
int size=-1;
if(x && x->queue)
size=queue_getsize(x->queue);
return size;
}
|
