Changeset bc117a5 in mainline for kernel/generic/src/ipc/ipc.c

Timestamp:

2016-08-29T12:43:10Z (8 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c32b6f0

Parents:

6d351e6

Message:

Partially revert jakub@…

This changeset reintroduces portions of the synchronous IPC mechanism for
internal use by the kernel / user_backend. The synchronous IPC is not
exported to user space and is simpler than in its original form.

File:

• kernel/generic/src/ipc/ipc.c (modified) (2 diffs)

kernel/generic/src/ipc/ipc.c

@@ -188 +188 @@
 }
 
+/** Helper function to facilitate synchronous calls.
+ *
+ * @param phone   Destination kernel phone structure.
+ * @param request Call structure with request.
+ *
+ * @return EOK on success or a negative error code.
+ *
+ */
+int ipc_call_sync(phone_t *phone, call_t *request)
+{
+        answerbox_t *mybox = slab_alloc(ipc_answerbox_slab, 0);
+        ipc_answerbox_init(mybox, TASK);
+        
+        /* We will receive data in a special box. */
+        request->callerbox = mybox;
+        
+        int rc = ipc_call(phone, request);
+        if (rc != EOK) {
+                slab_free(ipc_answerbox_slab, mybox);
+                return rc;
+        }
+        // TODO: forget the call if interrupted
+        (void) ipc_wait_for_call(mybox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
+        
+        slab_free(ipc_answerbox_slab, mybox);
+        return EOK;
+}
+
 /** Answer a message which was not dispatched and is not listed in any queue.
  *
@@ -756 +784 @@
         ipc_cleanup_call_list(&TASK->answerbox,
             &TASK->answerbox.dispatched_calls);
-
+        
         ipc_forget_all_active_calls();
         ipc_wait_for_all_answered_calls();