-draft structure for operation queues

1 files changed, 98 insertions, 0 deletions

diff --git a/src/testbed/testbed_api_operations.h b/src/testbed/testbed_api_operations.h
index 8d478bf95..4c888d52d 100644
--- a/src/testbed/testbed_api_operations.h
+++ b/src/testbed/testbed_api_operations.h
@@ -30,5 +30,103 @@
 #include "gnunet_helper_lib.h"
 
 
+/**
+ * Queue of operations where we can only support a certain
+ * number of concurrent operations of a particular type.
+ */
+struct OperationQueue;
+
+
+/**
+ * Create an operation queue.
+ *
+ * @param max_active maximum number of operations in this
+ *        queue that can be active in parallel at the same time
+ * @return handle to the queue
+ */
+struct OperationQueue *
+GNUNET_TESTBED_operation_queue_create_ (unsigned int max_active);
+
+
+/**
+ * Destroy an operation queue.  The queue MUST be empty
+ * at this time.
+ *
+ * @param queue queue to destroy
+ */
+void
+GNUNET_TESTBED_operation_queue_destroy_ (struct OperationQueue *queue);
+
+
+/**
+ * Add an operation to a queue.  An operation can be in multiple
+ * queues at once.  Once all queues permit the operation to become
+ * active, the operation will be activated.  The actual activation
+ * will occur in a separate task (thus allowing multiple queue 
+ * insertions to be made without having the first one instantly
+ * trigger the operation if the first queue has sufficient 
+ * resources).
+ *
+ * @param queue queue to add the operation to
+ * @param operation operation to add to the queue
+ */
+void
+GNUNET_TESTBED_operation_queue_insert_ (struct OperationQueue *queue,
+                                        struct GNUNET_TESTBED_Operation *operation);
+
+
+/**
+ * Remove an operation from a queue.  This can be because the
+ * oeration was active and has completed (and the resources have
+ * been released), or because the operation was cancelled and
+ * thus scheduling the operation is no longer required.
+ *
+ * @param queue queue to add the operation to
+ * @param operation operation to add to the queue
+ */
+void
+GNUNET_TESTBED_operation_queue_remove_ (struct OperationQueue *queue,
+                                        struct GNUNET_TESTBED_Operation *operation);
+
+
+
+/**
+ * Function to call to start an operation once all
+ * queues the operation is part of declare that the
+ * operation can be activated.
+ */
+typedef void (*OperationStart)(void *cls);
+
+
+/**
+ * Function to call to cancel an operation (release all associated
+ * resources).  This can be because of a call to
+ * "GNUNET_TESTBED_operation_cancel" (before the operation generated
+ * an event) or AFTER the operation generated an event due to a call
+ * to "GNUNET_TESTBED_operation_done".  Thus it is not guaranteed that
+ * a callback to the 'OperationStart' preceeds the call to
+ * 'OperationRelease'.  Implementations of this function are expected
+ * to clean up whatever state is in 'cls' and release all resources
+ * associated with the operation. 
+ */
+typedef void (*OperationRelease)(void *cls);
+
+
+/**
+ * Create an 'operation' to be performed.
+ *
+ * @param cls closure for the callbacks
+ * @param start function to call to start the operation
+ * @param release function to call to close down the operation
+ * @param ... FIXME
+ * @return handle to the operation
+ */
+struct GNUNET_TESTBED_Operation *
+GNUNET_TESTBED_operation_create_ (void *cls,
+                                  OperationStart start,
+                                  OperationRelease release,
+                                  ...);
+
+
 #endif
 /* end of testbed_api_operations.h */