struct vbe_conn *
VBE_GetVbe(struct sess *sp, struct backend *bp)
{
struct vbe_conn *vc;
CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
CHECK_OBJ_NOTNULL(bp, BACKEND_MAGIC);
/* first look for vbe_conn's we can recycle */
while (1) {
Lck_Lock(&bp->mtx);
vc = VTAILQ_FIRST(&bp->connlist);
if (vc != NULL) {
bp->refcount++;
assert(vc->backend == bp);
assert(vc->fd >= 0);
VTAILQ_REMOVE(&bp->connlist, vc, list);
}
Lck_Unlock(&bp->mtx);
if (vc == NULL)
break;
if (VBE_CheckFd(vc->fd)) {
/* XXX locking of stats */
VSL_stats->backend_reuse += 1;
VSL_stats->backend_conn++;
WSP(sp, SLT_Backend, "%d %s %s",
vc->fd, sp->director->vcl_name, bp->vcl_name);
return (vc);
}
sp->vbe = vc;
VBE_ClosedFd(sp);
}
if (!bp->healthy) {
VSL_stats->backend_unhealthy++;
return (NULL);
}
if (bp->max_conn > 0 && bp->n_conn >= bp->max_conn) {
VSL_stats->backend_busy++;
return (NULL);
}
vc = VBE_NewConn();
assert(vc->fd == -1);
AZ(vc->backend);
vc->fd = bes_conn_try(sp, bp);
if (vc->fd < 0) {
VBE_ReleaseConn(vc);
VSL_stats->backend_fail++;
return (NULL);
}
vc->backend = bp;
VSL_stats->backend_conn++;
WSP(sp, SLT_Backend, "%d %s %s",
vc->fd, sp->director->vcl_name, bp->vcl_name);
return (vc);
}
static struct vbc *
vbe_GetVbe(struct busyobj *bo, struct vdi_simple *vs)
{
struct vbc *vc;
struct backend *bp;
CHECK_OBJ_NOTNULL(bo, BUSYOBJ_MAGIC);
CHECK_OBJ_NOTNULL(vs, VDI_SIMPLE_MAGIC);
bp = vs->backend;
CHECK_OBJ_NOTNULL(bp, BACKEND_MAGIC);
/* first look for vbc's we can recycle */
while (1) {
Lck_Lock(&bp->mtx);
vc = VTAILQ_FIRST(&bp->connlist);
if (vc != NULL) {
bp->refcount++;
assert(vc->backend == bp);
assert(vc->fd >= 0);
AN(vc->addr);
VTAILQ_REMOVE(&bp->connlist, vc, list);
}
Lck_Unlock(&bp->mtx);
if (vc == NULL)
break;
if (vbe_CheckFd(vc->fd)) {
/* XXX locking of stats */
VSC_C_main->backend_reuse += 1;
VSLb(bo->vsl, SLT_Backend, "%d %s %s",
vc->fd, bo->director->vcl_name,
bp->display_name);
vc->vdis = vs;
vc->recycled = 1;
return (vc);
}
VSC_C_main->backend_toolate++;
VSLb(bo->vsl, SLT_BackendClose, "%d %s toolate",
vc->fd, bp->display_name);
/* Checkpoint log to flush all info related to this connection
before the OS reuses the FD */
VSL_Flush(bo->vsl, 0);
VTCP_close(&vc->fd);
VBE_DropRefConn(bp);
vc->backend = NULL;
VBE_ReleaseConn(vc);
}
if (!VBE_Healthy(bp, NULL)) {
VSC_C_main->backend_unhealthy++;
return (NULL);
}
if (vs->vrt->max_connections > 0 &&
bp->n_conn >= vs->vrt->max_connections) {
VSC_C_main->backend_busy++;
return (NULL);
}
vc = vbe_NewConn();
assert(vc->fd == -1);
AZ(vc->backend);
bes_conn_try(bo, vc, vs);
if (vc->fd < 0) {
VBE_ReleaseConn(vc);
VSC_C_main->backend_fail++;
return (NULL);
}
vc->backend = bp;
VSC_C_main->backend_conn++;
VSLb(bo->vsl, SLT_Backend, "%d %s %s",
vc->fd, bo->director->vcl_name, bp->display_name);
vc->vdis = vs;
return (vc);
}
