engine: define constant for config context event loop.

Signed-off-by: Phillip Adair Stewart Whelan <phillip.whelan@chronosphere.io>

Author: pwhelan

include/fluent-bit/flb_config.h

@@ -41,6 +41,7 @@
 #define FLB_CONFIG_DEFAULT_TASK_MAP_SIZE  2048
 #define FLB_CONFIG_DEFAULT_TASK_MAP_SIZE_LIMIT  16384
 #define FLB_CONFIG_DEFAULT_TASK_MAP_SIZE_GROWTH_SiZE 256
+#define FLB_CONFIG_EVENT_LOOP_SIZE 8
 
 /* The reason behind FLB_CONFIG_DEFAULT_TASK_MAP_SIZE_LIMIT being set to 16384
  * is that this is largest unsigned number expressable with 14 bits which is

src/flb_engine.c

@@ -724,7 +724,7 @@ int flb_engine_start(struct flb_config *config)
      *
      */
     /* Create the event loop and set it in the global configuration */
-    config->ctx_evl = mk_event_loop_create(8);
+    config->ctx_evl = mk_event_loop_create(FLB_CONFIG_EVENT_LOOP_SIZE);
     if (!config->ctx_evl) {
         fprintf(stderr, "[log] could not create context event loop\n");
         return -1;