From 5ed061810d1211589ce9ae30eb32553eccd6a739 Mon Sep 17 00:00:00 2001
From: Matthias Ringwald <matthias@ringwald.ch>
Date: Thu, 24 Mar 2016 19:27:42 +0100
Subject: [PATCH] runloop: add callback type enum, add flags to
 btstack_data_source_t

---
 src/btstack_run_loop.h | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/btstack_run_loop.h b/src/btstack_run_loop.h
index 2d35861d5..c2f4b4dd5 100644
--- a/src/btstack_run_loop.h
+++ b/src/btstack_run_loop.h
@@ -59,9 +59,14 @@ extern "C" {
 #endif
 	
 typedef struct btstack_data_source {
+	// 
     btstack_linked_item_t item;
-    int  fd;                                 // <-- file descriptor to watch or 0
-    int  (*process)(struct btstack_data_source *ds); // <-- do processing
+    // file descriptor to watch for run loops that support file descriptors
+    int  fd;
+    // callback to call for enabled callback types
+    int  (*process)(struct btstack_data_source *ds);
+    // flags storing enabled callback types
+    uint16_t flags;
 } btstack_data_source_t;
 
 typedef struct btstack_timer_source {
@@ -92,9 +97,17 @@ typedef struct btstack_run_loop {
 
 void btstack_run_loop_timer_dump(void);
 
-
 /* API_START */
 
+/**
+ * possible callback types for run loop data sources
+ */
+typedef enum {
+	DATA_SOURCE_CALLBACK_POLL  = 1 << 0,
+	DATA_SOURCE_CALLBACK_READ  = 1 << 1,
+	DATA_SOURCE_CALLBACK_WRITE = 1 << 2,
+} btstack_data_source_callback_type_t;
+
 /**
  * @brief Init main run loop. Must be called before any other run loop call.
  *