first pass at setting up base layer async thread path

src/base/base_entry_point.c

@@ -2,6 +2,8 @@
 // Licensed under the MIT license (https://opensource.org/license/mit/)
 
 global U64 global_update_tick_idx = 0;
+global CondVar async_tick_cond_var = {0};
+global Mutex async_tick_mutex = {0};
 
 internal void
 main_thread_base_entry_point(int arguments_count, char **arguments)
@@ -9,6 +11,10 @@ main_thread_base_entry_point(int arguments_count, char **arguments)
   Temp scratch = scratch_begin(0, 0);
   ThreadNameF("[main thread]");
   
+  //- rjf: set up async thread group info
+  async_tick_cond_var = cond_var_alloc();
+  async_tick_mutex = mutex_alloc();
+  
   //- rjf: set up telemetry
 #if PROFILE_TELEMETRY
   local_persist char tm_data[MB(64)];
@@ -133,3 +139,15 @@ update(void)
 #endif
   return result;
 }
+
+internal void
+async_thread_entry_point(void *params)
+{
+  MutexScope(async_tick_mutex) for(;;)
+  {
+    cond_var_wait(async_tick_cond_var, async_tick_mutex, max_U64);
+#if defined(FILE_STREAM_H)
+    fs_async_tick();
+#endif
+  }
+}