Gave asynchronous operations approximate POSIX signal semantics. This

will enable us to cascade async operations, which is necessary in order to
properly support DNS.  (For example, an HTTP request may have to redirect
to a new location and will have to perform a new DNS lookup, so we can't
just rely on doing the name lookup at the time of parsing the initial
URL).

Anything other than HTTP is probably broken right now; I'll fix the others
up asap.

1 files changed, 9 insertions, 7 deletions

diff --git a/src/net/tcp/iscsi.c b/src/net/tcp/iscsi.c
index ae23cfe8..09edf697 100644
--- a/src/net/tcp/iscsi.c
+++ b/src/net/tcp/iscsi.c
@@ -121,7 +121,7 @@ static void iscsi_done ( struct iscsi_session *iscsi, int rc ) {
 	iscsi->command = NULL;
 
 	/* Mark asynchronous operation as complete */
-	async_done ( &iscsi->aop, rc );
+	async_done ( &iscsi->async, rc );
 }
 
 /****************************************************************************
@@ -1208,10 +1208,11 @@ static struct tcp_operations iscsi_tcp_operations = {
  *
  * @v iscsi		iSCSI session
  * @v command		SCSI command
- * @ret aop		Asynchronous operation for this SCSI command
+ * @v parent		Parent asynchronous operation
+ * @ret rc		Return status code
  */
-struct async_operation * iscsi_issue ( struct iscsi_session *iscsi,
-				       struct scsi_command *command ) {
+int iscsi_issue ( struct iscsi_session *iscsi, struct scsi_command *command,
+		  struct async *parent ) {
 	int rc;
 
 	assert ( iscsi->command == NULL );
@@ -1219,7 +1220,7 @@ struct async_operation * iscsi_issue ( struct iscsi_session *iscsi,
 
 	if ( iscsi->instant_rc ) {
 		/* Abort immediately rather than retrying */
-		iscsi_done ( iscsi, iscsi->instant_rc );
+		return iscsi->instant_rc;
 	} else if ( iscsi->status ) {
 		/* Session already open: issue command */
 		iscsi_start_command ( iscsi );
@@ -1231,11 +1232,12 @@ struct async_operation * iscsi_issue ( struct iscsi_session *iscsi,
 					  0 ) ) != 0 ) {
 			DBGC ( iscsi, "iSCSI %p could not open TCP "
 			       "connection: %s\n", iscsi, strerror ( rc ) );
-			iscsi_done ( iscsi, rc );
+			return rc;
 		}
 	}
 
-	return &iscsi->aop;
+	async_init ( &iscsi->async, &default_async_operations, parent );
+	return 0;
 }
 
 /**