diff --git a/src/apex/perftool_implementation.cpp b/src/apex/perftool_implementation.cpp
index 8db2bb15..f30deb66 100644
--- a/src/apex/perftool_implementation.cpp
+++ b/src/apex/perftool_implementation.cpp
@@ -15,59 +15,73 @@ std::mutex my_mutex;
 
 extern "C" {
     // library function declarations
-    void ps_initialize(void) {
+    void ps_tool_initialize(void) {
         apex_init("PerfStubs API", 0, 1);
     }
-    void ps_register_thread(void) {
+    void ps_tool_register_thread(void) {
         apex_register_thread("PerfStubs Thread");
     }
-    void ps_finalize(void) {
+    void ps_tool_finalize(void) {
         apex_exit_thread();
     }
-    void ps_dump_data(void) {
+    void ps_tool_dump_data(void) {
         apex_dump(false);
     }
 
     // measurement function declarations
-    void* ps_timer_create(const char *timer_name) {
+    void* ps_tool_timer_create(const char *timer_name) {
         return strdup(timer_name);
     }
-    void ps_timer_start(const void *timer) {
+    void ps_tool_timer_start(const void *timer) {
         apex_start(APEX_NAME_STRING, const_cast<void*>(timer));
     }
-    void ps_timer_stop(const void *timer) {
+    void ps_tool_timer_stop(const void *timer) {
         APEX_UNUSED(timer);
         apex_stop(apex::thread_instance::instance().get_current_profiler());
     }
-    void ps_dynamic_phase_start(const char *iteration_prefix,
+    void ps_tool_start_string(const char *timer) {
+        apex_start(APEX_NAME_STRING, const_cast<char*>(timer));
+    }
+    void ps_tool_stop_string(const char *timer) {
+        APEX_UNUSED(timer);
+        apex_stop(apex::thread_instance::instance().get_current_profiler());
+    }
+    void ps_tool_stop_current(void) {
+        apex_stop(apex::thread_instance::instance().get_current_profiler());
+    }
+    void ps_tool_set_parameter(const char * name, int64_t value) {
+        APEX_UNUSED(name);
+        APEX_UNUSED(value);
+    }
+    void ps_tool_dynamic_phase_start(const char *iteration_prefix,
                                       int iteration_number) {
         std::stringstream ss;
         ss << iteration_prefix << " " << iteration_number;
         apex_start(APEX_NAME_STRING, (void*)const_cast<char*>(ss.str().c_str()));
     }
-    void ps_dynamic_phase_stop(const char *iteration_prefix,
+    void ps_tool_dynamic_phase_stop(const char *iteration_prefix,
                                      int iteration_number) {
         APEX_UNUSED(iteration_prefix);
         APEX_UNUSED(iteration_number);
         apex_stop(apex::thread_instance::instance().get_current_profiler());
     }
-    void* ps_create_counter(const char *counter_name) {
+    void* ps_tool_create_counter(const char *counter_name) {
         return (void*)(strdup(counter_name));
     }
-    void ps_sample_counter(const void *counter, double value) {
+    void ps_tool_sample_counter(const void *counter, double value) {
         apex_sample_value((const char *)(counter), value);
     }
-    void ps_set_metadata(const char *name, const char *value) {
+    void ps_tool_set_metadata(const char *name, const char *value) {
         APEX_UNUSED(name);
         APEX_UNUSED(value);
         // do nothing
     }
 
     // data query function declarations
-    void ps_get_timer_data(ps_tool_timer_data_t *timer_data) {
+    void ps_tool_get_timer_data(ps_tool_timer_data_t *timer_data) {
         memset(timer_data, 0, sizeof(ps_tool_timer_data_t));
     }
-    void ps_free_timer_data(ps_tool_timer_data_t *timer_data) {
+    void ps_tool_free_timer_data(ps_tool_timer_data_t *timer_data) {
         if (timer_data == nullptr)
         {
             return;
@@ -88,10 +102,10 @@ extern "C" {
             timer_data->values = nullptr;
         }
     }
-    void ps_get_counter_data(ps_tool_counter_data_t *counter_data) {
+    void ps_tool_get_counter_data(ps_tool_counter_data_t *counter_data) {
         memset(counter_data, 0, sizeof(ps_tool_counter_data_t));
     }
-    void ps_free_counter_data(ps_tool_counter_data_t *counter_data) {
+    void ps_tool_free_counter_data(ps_tool_counter_data_t *counter_data) {
         if (counter_data == nullptr)
         {
             return;
@@ -127,10 +141,10 @@ extern "C" {
             counter_data->value_sumsqr = nullptr;
         }
     }
-    void ps_get_metadata(ps_tool_metadata_t *metadata) {
+    void ps_tool_get_metadata(ps_tool_metadata_t *metadata) {
         memset(metadata, 0, sizeof(ps_tool_metadata_t));
     }
-    void ps_free_metadata(ps_tool_metadata_t *metadata) {
+    void ps_tool_free_metadata(ps_tool_metadata_t *metadata) {
         if (metadata == nullptr)
         {
             return;