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Fixes bug in scheduling of callback by main loop.

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If other side of a socket is sending data faster than
BIRD is processing, BIRD does not schedule any other
callbacks (events, timers, rx/tx callbacks).
This commit is contained in:
Ondrej Zajicek 2009-06-20 00:59:32 +02:00
parent 2757985709
commit 4323099da9
1 changed files with 13 additions and 2 deletions
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15
sysdep/unix/io.c
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@ -30,6 +30,12 @@
#include "lib/unix.h" #include "lib/unix.h"
#include "lib/sysio.h" #include "lib/sysio.h"
/* Maximum number of calls of rx/tx handler for one socket in one
* select iteration. Should be small enough to not monopolize CPU by
* one protocol instance.
*/
#define MAX_STEPS 4
/* /*
* Tracked Files * Tracked Files
*/ */
@ -1341,22 +1347,27 @@ io_loop(void)
{ {
sock *s = current_sock; sock *s = current_sock;
int e; int e;
int steps = MAX_STEPS;
if (FD_ISSET(s->fd, &rd) && s->rx_hook) if (FD_ISSET(s->fd, &rd) && s->rx_hook)
do do
{ {
steps--;
e = sk_read(s); e = sk_read(s);
if (s != current_sock) if (s != current_sock)
goto next; goto next;
} }
while (e && s->rx_hook); while (e && s->rx_hook && steps);
steps = MAX_STEPS;
if (FD_ISSET(s->fd, &wr)) if (FD_ISSET(s->fd, &wr))
do do
{ {
steps--;
e = sk_write(s); e = sk_write(s);
if (s != current_sock) if (s != current_sock)
goto next; goto next;
} }
while (e); while (e && steps);
current_sock = sk_next(s); current_sock = sk_next(s);
next: ; next: ;
} }