Debugging perfetto trace with hpx - make sure the trace is closed on …

…exit

src/apex/CMakeLists.hpx

@@ -338,7 +338,7 @@ set(apex_sources
     gzstream.cpp
     handler.cpp
     memory_wrapper.cpp
-    ${APEX_SOURCE_DIR}/../perfetto_sdk/perfetto.cc
+    ../perfetto_sdk/perfetto.cc
     perfetto_listener.cpp
     perfetto_static.cpp
     policy_handler.cpp
@@ -398,7 +398,7 @@ target_include_directories(apex PUBLIC
     $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
     $<BUILD_INTERFACE:${APEX_BINARY_DIR}>
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}>
-    $<BUILD_INTERFACE:${APEX_SOURCE_DIR}/../perfetto_sdk>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../perfetto_sdk>
     $<INSTALL_INTERFACE:include>)
 
 # To have the compile options and definitions

src/apex/perfetto_listener.cpp

@@ -51,7 +51,10 @@ perfetto_listener::perfetto_listener (void) {
     tracing_session->StartBlocking();
 }
 
-perfetto_listener::~perfetto_listener (void) {
+void perfetto_listener::close_trace() {
+    static bool closed{false};
+    if (closed) return;
+    closed = true;
     // Make sure the last event is closed for this example.
     perfetto::TrackEvent::Flush();
 
@@ -72,6 +75,11 @@ perfetto_listener::~perfetto_listener (void) {
         "text form, run `./tools/traceconv text example.pftrace`");
         */
     close(file_descriptor);
+
+}
+
+perfetto_listener::~perfetto_listener (void) {
+    close_trace();
 }
 
 void perfetto_listener::on_startup(startup_event_data &data) {
@@ -95,6 +103,7 @@ void perfetto_listener::on_pre_shutdown(void) {
 
 void perfetto_listener::on_shutdown(shutdown_event_data &data) {
     APEX_UNUSED(data);
+    close_trace();
     return;
 }
 

src/apex/perfetto_listener.hpp

@@ -49,6 +49,7 @@ class perfetto_listener : public event_listener {
 private:
     void get_file_name();
     size_t make_tid (base_thread_node &node);
+    void close_trace();
     std::unique_ptr<perfetto::TracingSession> tracing_session;
     std::string filename;
     int file_descriptor;