rt: Expand rust_kernel::live_tasks to a uintptr_t

Author: brson

src/rt/rust_kernel.cpp

@@ -84,7 +84,7 @@ rust_kernel::fail() {
 
 void
 rust_kernel::register_task(rust_task *task) {
-    int new_live_tasks;
+    uintptr_t new_live_tasks;
     {
         scoped_lock with(task_lock);
         task->user.id = max_task_id++;
@@ -99,7 +99,7 @@ rust_kernel::register_task(rust_task *task) {
 void
 rust_kernel::release_task_id(rust_task_id id) {
     KLOG_("Releasing task %" PRIdPTR, id);
-    int new_live_tasks;
+    uintptr_t new_live_tasks;
     {
         scoped_lock with(task_lock);
         task_table.remove(id);

src/rt/rust_kernel.h

@@ -27,7 +27,7 @@ class rust_kernel {
     // Tracks the number of tasks that are being managed by
     // schedulers. When this hits 0 we will tell all schedulers
     // to exit.
-    int live_tasks;
+    uintptr_t live_tasks;
     // The next task id
     rust_task_id max_task_id;
     hash_map<rust_task_id, rust_task *> task_table;