Make the long-range gravity task lock/unlock the multipoles and not the gparts.

examples/main.c

@@ -690,7 +690,7 @@ int main(int argc, char *argv[]) {
     }
 
 #ifdef WITH_MPI
-    if(periodic && with_self_gravity)
+    if (periodic && with_self_gravity)
       error("Periodic self-gravity over MPI temporarily disabled.");
 #endif
 
@@ -729,7 +729,6 @@ int main(int argc, char *argv[]) {
           "ICs.",
           N_total[0], N_total[2], N_total[1]);
 
-
     /* Verify that the fields to dump actually exist */
     if (myrank == 0) io_check_output_fields(params, N_total);
 

src/task.c

@@ -286,7 +286,6 @@ void task_unlock(struct task *t) {
 
     case task_type_drift_gpart:
     case task_type_grav_mesh:
-    case task_type_grav_long_range:
       cell_gunlocktree(ci);
       break;
 
@@ -319,6 +318,7 @@ void task_unlock(struct task *t) {
       break;
 
     case task_type_grav_mm:
+    case task_type_grav_long_range:
       cell_munlocktree(ci);
       break;
 
@@ -382,7 +382,6 @@ int task_lock(struct task *t) {
 
     case task_type_drift_gpart:
     case task_type_grav_mesh:
-    case task_type_grav_long_range:
       if (ci->ghold) return 0;
       if (cell_glocktree(ci) != 0) return 0;
       break;
@@ -444,6 +443,7 @@ int task_lock(struct task *t) {
       }
       break;
 
+    case task_type_grav_long_range:
     case task_type_grav_mm:
       /* Lock the m-poles */
       if (ci->mhold) return 0;