1 files changed, 57 insertions, 0 deletions
diff --git a/src/os/unix/ngx_aio_read_chain.c b/src/os/unix/ngx_aio_read_chain.c
new file mode 100644
index 000000000..31f7c8573
--- /dev/null
+++ b/src/os/unix/ngx_aio_read_chain.c
@@ -0,0 +1,57 @@
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+#include <ngx_aio.h>
+
+
+ssize_t ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl)
+{
+    int           n;
+    char         *buf, *prev;
+    size_t        size, total;
+    ngx_err_t     err;
+
+    total = 0;
+
+    while (cl) {
+
+        /* we can post the single aio operation only */
+
+        if (c->read->active) {
+            return total ? total : NGX_AGAIN;
+        }
+
+        buf = cl->hunk->pos;
+        prev = buf;
+        size = 0;
+
+        /* coalesce the neighbouring hunks */
+
+        while (cl && prev == cl->hunk->pos) {
+            size += cl->hunk->last - cl->hunk->pos;
+            prev = cl->hunk->last;
+            cl = cl->next;
+        }
+
+        n = ngx_aio_read(c, buf, size);
+
+        ngx_log_debug(c->log, "aio_read: %d" _ n);
+
+        if (n == NGX_AGAIN) {
+            return total ? total : NGX_AGAIN;
+        }
+
+        if (n == NGX_ERROR) {
+            return NGX_ERROR;
+        }
+
+        if (n > 0) {
+            total += n;
+        }
+
+        ngx_log_debug(c->log, "aio_read total: %d" _ total);
+    }
+
+    return total ? total : NGX_AGAIN;
+}