event/multiqueue.c: Rename "queue" to "multiqueue".

`lib/queue.h` implements a basic queue. `event/queue.c` implements
a specialized data structure on top of lib/queue.h; it is not a "normal"
queue.

Rename the specialized multi-level queue implemented in event/queue.c to
"multiqueue", to avoid confusion when reading the code.

Before this change one can eventually notice that "macros (uppercase
symbols) are for the normal queue, lowercase operations are for the
multi-level queue", but that is unnecessary friction for new developers
(or existing developers just visiting this part of the codebase).

2 files changed, 7 insertions, 7 deletions

diff --git a/src/nvim/os/input.c b/src/nvim/os/input.c
index 6873e32f34..1307ab5e5a 100644
--- a/src/nvim/os/input.c
+++ b/src/nvim/os/input.c
@@ -87,8 +87,8 @@ static void create_cursorhold_event(void)
   // have been called(inbuf_poll would return kInputAvail)
   // TODO(tarruda): Cursorhold should be implemented as a timer set during the
   // `state_check` callback for the states where it can be triggered.
-  assert(!events_enabled || queue_empty(main_loop.events));
-  queue_put(main_loop.events, cursorhold_event, 0);
+  assert(!events_enabled || multiqueue_empty(main_loop.events));
+  multiqueue_put(main_loop.events, cursorhold_event, 0);
 }
 
 // Low level input function
@@ -422,5 +422,5 @@ static void read_error_exit(void)
 
 static bool pending_events(void)
 {
-  return events_enabled && !queue_empty(main_loop.events);
+  return events_enabled && !multiqueue_empty(main_loop.events);
 }
diff --git a/src/nvim/os/shell.c b/src/nvim/os/shell.c
index 617a505367..e9a3dcbff8 100644
--- a/src/nvim/os/shell.c
+++ b/src/nvim/os/shell.c
@@ -207,7 +207,7 @@ static int do_os_system(char **argv,
   Stream in, out, err;
   LibuvProcess uvproc = libuv_process_init(&main_loop, &buf);
   Process *proc = &uvproc.process;
-  Queue *events = queue_new_child(main_loop.events);
+  MultiQueue *events = multiqueue_new_child(main_loop.events);
   proc->events = events;
   proc->argv = argv;
   proc->in = input != NULL ? &in : NULL;
@@ -221,7 +221,7 @@ static int do_os_system(char **argv,
       msg_outtrans((char_u *)prog);
       msg_putchar('\n');
     }
-    queue_free(events);
+    multiqueue_free(events);
     return -1;
   }
 
@@ -277,8 +277,8 @@ static int do_os_system(char **argv,
     }
   }
 
-  assert(queue_empty(events));
-  queue_free(events);
+  assert(multiqueue_empty(events));
+  multiqueue_free(events);
 
   return status;
 }