first version of the universal paraslash scheduler

[paraslash.git] / write_common.c

diff --git a/write_common.c b/write_common.c
index e76d7f46a537a1c00f47dc055506d39e13cf9bc2..6ff778a92d0451ab0500c2dc8b88fbff02e30323 100644 (file)
--- a/write_common.c
+++ b/write_common.c
@@ -20,6 +20,8 @@
 
 #include "para.h"
 #include "string.h"
+#include "list.h"
+#include "sched.h"
 #include "write.h"
 #include "error.h"
 
@@ -70,6 +72,31 @@ out:
        return ret;
 }
 
+static void wng_post_select(struct sched *s, struct task *t)
+{
+       struct writer_node_group *g = t->private_data;
+       int i;
+       size_t min_written = 0;
+
+       FOR_EACH_WRITER_NODE(i, g) {
+               struct writer_node *wn = &g->writer_nodes[i];
+               t->ret = wn->task.ret;
+               if (t->ret < 0)
+                       return;
+               if (!i)
+                       min_written = t->ret;
+               else
+                       min_written = PARA_MIN(min_written, t->ret);
+       }
+       *g->loaded -= min_written;
+       if (!*g->loaded && g->eof)
+               t->ret = 0;
+       else
+               t->ret = 1;
+       if (*g->loaded && min_written)
+               memmove(g->buf, g->buf + min_written, *g->loaded);
+}
+
 int wng_open(struct writer_node_group *g)
 {
        int i, ret = 1;
@@ -81,21 +108,49 @@ int wng_open(struct writer_node_group *g)
                        goto out;
                wn->chunk_bytes = ret;
                g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
+               wn->wng = g;
+               PARA_DEBUG_LOG("pre_select: %p\n", &wn->writer->pre_select);
+               PARA_DEBUG_LOG("post_select: %p\n", &wn->writer->post_select);
+               wn->task.pre_select = wn->writer->pre_select;
+               wn->task.post_select = wn->writer->post_select;
+               wn->task.private_data = wn;
+               register_task(&wn->task);
        }
+       register_task(&g->task);
 out:
        return ret;
 }
 
+void wng_destroy(struct writer_node_group *g)
+{
+       if (!g)
+               return;
+       free(g->written);
+       free(g->writer_nodes);
+       free(g);
+}
+
 void wng_close(struct writer_node_group *g)
 {
        int i;
 
        FOR_EACH_WRITER_NODE(i, g) {
                struct writer_node *wn = &g->writer_nodes[i];
+               unregister_task(&wn->task);
                wn->writer->close(wn);
        }
 }
 
+static void wng_error_handler(struct task *t)
+{
+       struct writer_node_group *g = t->private_data;
+
+       PARA_INFO_LOG("%p: ret = %d\n", t, t->ret);
+       unregister_task(t);
+       wng_close(g);
+       wng_destroy(g);
+}
+
 struct writer_node_group *wng_new(unsigned num_writers)
 {
        struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
@@ -103,18 +158,13 @@ struct writer_node_group *wng_new(unsigned num_writers)
        g->writer_nodes = para_calloc(num_writers
                * sizeof(struct writer_node));
        g->written = para_calloc(num_writers * sizeof(size_t));
+       g->task.private_data = g;
+       g->task.post_select = wng_post_select;
+       g->task.error_handler = wng_error_handler;
+       g->task.flags = POST_ADD_TAIL | POST_EOF_IS_ERROR;
        return g;
 }
 
-void wng_destroy(struct writer_node_group *g)
-{
-       if (!g)
-               return;
-       free(g->written);
-       free(g->writer_nodes);
-       free(g);
-}
-
 void init_supported_writers(void)
 {
        int i;