2 * Copyright (C) 1995-2005, Index Data ApS
3 * See the file LICENSE for details.
5 * $Id: eventl.c,v 1.6 2005-01-17 12:53:04 adam Exp $
10 * \brief Implements event loop handling for GFS.
12 * This source implements the main event loop for the Generic Frontend
13 * Server. It uses select(2).
23 #include <sys/types.h>
35 #include <sys/select.h>
38 #include <yaz/yconfig.h>
40 #include <yaz/comstack.h>
41 #include <yaz/xmalloc.h>
44 #include <yaz/statserv.h>
48 #define YAZ_EV_SELECT pth_select
52 #define YAZ_EV_SELECT select
55 static int log_level=0;
56 static int log_level_initialized=0;
58 IOCHAN iochan_create(int fd, IOC_CALLBACK cb, int flags)
62 if (!log_level_initialized)
64 log_level=yaz_log_module_level("eventl");
65 log_level_initialized=1;
68 if (!(new_iochan = (IOCHAN)xmalloc(sizeof(*new_iochan))))
70 new_iochan->destroyed = 0;
72 new_iochan->flags = flags;
74 new_iochan->force_event = 0;
75 new_iochan->last_event = new_iochan->max_idle = 0;
76 new_iochan->next = NULL;
80 int event_loop(IOCHAN *iochans)
82 do /* loop as long as there are active associations to process */
85 fd_set in, out, except;
87 static struct timeval to;
90 if (statserv_must_terminate())
92 for (p = *iochans; p; p = p->next)
93 p->force_event = EVENT_TIMEOUT;
101 for (p = *iochans; p; p = p->next)
104 yaz_log(log_level, "fd=%d flags=%d force_event=%d",
105 p->fd, p->flags, p->force_event);
107 to.tv_sec = 0; /* polling select */
108 if (p->flags & EVENT_INPUT)
110 if (p->flags & EVENT_OUTPUT)
112 if (p->flags & EVENT_EXCEPT)
113 FD_SET(p->fd, &except);
116 if (p->max_idle && p->last_event)
118 ftime = p->last_event + p->max_idle;
127 yaz_log(log_level, "select start %ld", (long) to.tv_sec);
128 res = YAZ_EV_SELECT(max + 1, &in, &out, &except, &to);
129 yaz_log(log_level, "select end");
132 if (yaz_errno() == EINTR)
134 if (statserv_must_terminate())
136 for (p = *iochans; p; p = p->next)
137 p->force_event = EVENT_TIMEOUT;
143 /* Destroy the first member in the chain, and try again */
144 association *assoc = (association *)iochan_getdata(*iochans);
145 COMSTACK conn = assoc->client_link;
148 destroy_association(assoc);
149 iochan_destroy(*iochans);
150 yaz_log(log_level, "error select, destroying iochan %p",
155 for (p = *iochans; p; p = p->next)
157 int force_event = p->force_event;
160 if (!p->destroyed && (FD_ISSET(p->fd, &in) ||
161 force_event == EVENT_INPUT))
164 (*p->fun)(p, EVENT_INPUT);
166 if (!p->destroyed && (FD_ISSET(p->fd, &out) ||
167 force_event == EVENT_OUTPUT))
170 (*p->fun)(p, EVENT_OUTPUT);
172 if (!p->destroyed && (FD_ISSET(p->fd, &except) ||
173 force_event == EVENT_EXCEPT))
176 (*p->fun)(p, EVENT_EXCEPT);
178 if (!p->destroyed && ((p->max_idle && now - p->last_event >=
179 p->max_idle) || force_event == EVENT_TIMEOUT))
182 (*p->fun)(p, EVENT_TIMEOUT);
185 for (p = *iochans; p; p = nextp)
193 /* We need to inform the threadlist that this channel has been destroyed */
196 /* Now reset the pointers */
201 for (pr = *iochans; pr; pr = pr->next)
204 assert(pr); /* grave error if it weren't there */