channels: refactor jobwait

src/nvim/channel.c

@@ -639,11 +639,11 @@ static void channel_process_exit_cb(Process *proc, int status, void *data)
     terminal_close(chan->term, msg);
   }
 
-  if (chan->status_ptr) {
-    *chan->status_ptr = status;
-  }
-
+  // if status is -1 the process did not really exit,
+  // we just closed the handle onto a detached process
+  if (status >= 0) {
     process_channel_event(chan, &chan->on_exit, "exit", NULL, 0, status);
+  }
 
   channel_decref(chan);
 }

src/nvim/channel.h

@@ -74,8 +74,6 @@ struct Channel {
   CallbackReader on_stdout;
   CallbackReader on_stderr;
   Callback on_exit;
-
-  varnumber_T *status_ptr; // TODO: refactor?
 };
 
 EXTERN PMap(uint64_t) *channels;

src/nvim/eval.c

@@ -11693,28 +11693,31 @@ static void f_jobwait(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     return;
   }
 
+
   list_T *args = argvars[0].vval.v_list;
-  list_T *rv = tv_list_alloc();
+  Channel **jobs = xcalloc(args->lv_len, sizeof(*jobs));
 
   ui_busy_start();
   MultiQueue *waiting_jobs = multiqueue_new_parent(loop_on_put, &main_loop);
   // For each item in the input list append an integer to the output list. -3
   // is used to represent an invalid job id, -2 is for a interrupted job and
   // -1 for jobs that were skipped or timed out.
-  for (listitem_T *arg = args->lv_first; arg != NULL; arg = arg->li_next) {
-    Channel *data = NULL;
+
+  int i = 0;
+  for (listitem_T *arg = args->lv_first; arg != NULL; arg = arg->li_next, i++) {
+    Channel *chan = NULL;
     if (arg->li_tv.v_type != VAR_NUMBER
-        || !(data = find_job(arg->li_tv.vval.v_number, false))) {
-      tv_list_append_number(rv, -3);
+        || !(chan = find_job(arg->li_tv.vval.v_number, false))) {
+      jobs[i] = NULL;
     } else {
-      // append the list item and set the status pointer so we'll collect the
-      // status code when the job exits
-      tv_list_append_number(rv, -1);
-      data->status_ptr = &rv->lv_last->li_tv.vval.v_number;
+      jobs[i] = chan;
+      channel_incref(chan);
+      if (chan->stream.proc.status < 0) {
         // Process any pending events for the job because we'll temporarily
         // replace the parent queue
-      multiqueue_process_events(data->events);
-      multiqueue_replace_parent(data->events, waiting_jobs);
+        multiqueue_process_events(chan->events);
+        multiqueue_replace_parent(chan->events, waiting_jobs);
+      }
     }
   }
 
@@ -11725,25 +11728,21 @@ static void f_jobwait(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     before = os_hrtime();
   }
 
-  for (listitem_T *arg = args->lv_first; arg != NULL; arg = arg->li_next) {
-    Channel *data = NULL;
+  for (i = 0; i < args->lv_len; i++) {
     if (remaining == 0) {
       // timed out
       break;
     }
-    if (arg->li_tv.v_type != VAR_NUMBER
-        || !(data = find_job(arg->li_tv.vval.v_number, false))) {
+
+    // if the job already exited, but wasn't freed yet
+    if (jobs[i] == NULL || jobs[i]->stream.proc.status >= 0) {
       continue;
     }
-    int status = process_wait((Process *)&data->stream.proc, remaining,
+
+    int status = process_wait(&jobs[i]->stream.proc, remaining,
                               waiting_jobs);
     if (status < 0) {
       // interrupted or timed out, skip remaining jobs.
-      if (status == -2) {
-        // set the status so the user can distinguish between interrupted and
-        // skipped/timeout jobs.
-        *data->status_ptr = -2;
-      }
       break;
     }
     if (remaining > 0) {
@@ -11756,30 +11755,24 @@ static void f_jobwait(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     }
   }
 
-  for (listitem_T *arg = args->lv_first; arg != NULL; arg = arg->li_next) {
-    Channel *data = NULL;
-    if (arg->li_tv.v_type != VAR_NUMBER
-        || !(data = find_job(arg->li_tv.vval.v_number, false))) {
-      continue;
-    }
-    // remove the status pointer because the list may be freed before the
-    // job exits
-    data->status_ptr = NULL;
-  }
+  list_T *rv = tv_list_alloc();
 
   // restore the parent queue for any jobs still alive
-  for (listitem_T *arg = args->lv_first; arg != NULL; arg = arg->li_next) {
-    Channel *data = NULL;
-    if (arg->li_tv.v_type != VAR_NUMBER
-        || !(data = find_job(arg->li_tv.vval.v_number, false))) {
+  for (i = 0; i < args->lv_len; i++) {
+    if (jobs[i] == NULL) {
+      tv_list_append_number(rv, -3);
       continue;
     }
     // restore the parent queue for the job
-    multiqueue_process_events(data->events);
-    multiqueue_replace_parent(data->events, main_loop.events);
+    multiqueue_process_events(jobs[i]->events);
+    multiqueue_replace_parent(jobs[i]->events, main_loop.events);
+
+    tv_list_append_number(rv, jobs[i]->stream.proc.status);
+    channel_decref(jobs[i]);
   }
 
   multiqueue_free(waiting_jobs);
+  xfree(jobs);
   ui_busy_stop();
   rv->lv_refcount++;
   rettv->v_type = VAR_LIST;

src/nvim/event/process.c

@@ -145,16 +145,15 @@ void process_close_streams(Process *proc) FUNC_ATTR_NONNULL_ALL
 /// @param process  Process instance
 /// @param ms       Time in milliseconds to wait for the process.
 ///                 0 for no wait. -1 to wait until the process quits.
-/// @return Exit code of the process.
+/// @return Exit code of the process. proc->status will have the same value.
 ///         -1 if the timeout expired while the process is still running.
 ///         -2 if the user interruped the wait.
 int process_wait(Process *proc, int ms, MultiQueue *events)
   FUNC_ATTR_NONNULL_ARG(1)
 {
-  int status = -1;  // default
   bool interrupted = false;
   if (!proc->refcount) {
-    status = proc->status;
+    int status = proc->status;
     LOOP_PROCESS_EVENTS(proc->loop, proc->events, 0);
     return status;
   }
@@ -190,7 +189,9 @@ int process_wait(Process *proc, int ms, MultiQueue *events)
   if (proc->refcount == 1) {
     // Job exited, collect status and manually invoke close_cb to free the job
     // resources
-    status = interrupted ? -2 : proc->status;
+    if (interrupted) {
+      proc->status = -2;
+    }
     decref(proc);
     if (events) {
       // the decref call created an exit event, process it now
@@ -200,7 +201,7 @@ int process_wait(Process *proc, int ms, MultiQueue *events)
     proc->refcount--;
   }
 
-  return status;
+  return proc->status;
 }
 
 /// Ask a process to terminate and eventually kill if it doesn't respond

src/nvim/event/process.h

@@ -39,7 +39,7 @@ static inline Process process_init(Loop *loop, ProcessType type, void *data)
     .loop = loop,
     .events = NULL,
     .pid = 0,
-    .status = 0,
+    .status = -1,
     .refcount = 0,
     .stopped_time = 0,
     .cwd = NULL,