X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;ds=sidebyside;f=filter_common.c;h=a27c2d303ad28d823ae9af20eeb4878f9300cad1;hb=c5cbf3fc1fb7a76ab48424581b5c212e1b66f9e4;hp=7c71ff39243a7a63f7026c11726418377790c87e;hpb=b0d2e5f940e595486443700998d27053e462183a;p=paraslash.git

diff --git a/filter_common.c b/filter_common.c
index 7c71ff39..a27c2d30 100644
--- a/filter_common.c
+++ b/filter_common.c
@@ -9,12 +9,14 @@
 #include <regex.h>
 #include <sys/types.h>
 #include <dirent.h>
+#include <stdbool.h>
 
 #include "para.h"
 #include "list.h"
 #include "sched.h"
 #include "fd.h"
 #include "ggo.h"
+#include "buffer_tree.h"
 #include "filter.h"
 #include "error.h"
 #include "string.h"
@@ -273,3 +275,39 @@ void print_filter_helps(int detailed)
 	}
 
 }
+
+/** 640K ought to be enough for everybody ;) */
+#define FILTER_MAX_PENDING (640 * 1024)
+
+int prepare_filter_node(struct filter_node *fn)
+{
+	struct btr_node *btrn = fn->btrn;
+	size_t iqs;
+
+	if (btr_eof(btrn))
+		return -E_FC_EOF;
+	if (btr_bytes_pending(btrn) > FILTER_MAX_PENDING)
+		return 0;
+	iqs = btr_get_input_queue_size(btrn);
+	if (iqs < fn->min_iqs && !btr_no_parent(btrn))
+		return 0;
+	assert(iqs != 0);
+	/* avoid "buffer too small" errors from the decoder */
+	btr_merge(btrn, fn->min_iqs);
+	return 1;
+}
+
+void generic_filter_pre_select(struct sched *s, struct task *t)
+{
+	struct filter_node *fn = container_of(t, struct filter_node, task);
+	size_t iqs = btr_get_input_queue_size(fn->btrn);
+
+	t->error = 0;
+	if (iqs < fn->min_iqs)
+		return;
+	if (btr_bytes_pending(fn->btrn) > FILTER_MAX_PENDING)
+		return; /* FIXME, should use reasonable bound on timeout */
+	s->timeout.tv_sec = 0;
+	s->timeout.tv_usec = 1;
+}
+