Handle fork in target application (#191)

* Always print PID in log messages

* omnitrace-dl updates

- omnitrace_preload does not call omnitrace_init or omnitrace_init_tooling
- omnitrace_preload will call omnitrace_set_mpi if OMNITRACE_USE_MPI
  or OMNITRACE_USE_MPIP in the env is true but not call it otherwise
  because doing so either overrides OMNITRACE_USE_PID (when true) or
  disable mpip from initialization (when false) and the MPI
  init can be caught later and override OMNITRACE_USE_PID

* config updates

- set_setting_value sets user update type
- remove volatile from get_settings_configured
- don't override settings::default_process_suffix
- don't kill process in omnitrace_exit_action
- set_state ignores updating state if >= State::Finalized

* Handle state > State::Finalized

* fork gotcha updates

- unsets LD_PRELOAD
- sets OMNITRACE_ROOT_PROCESS
- sets OMNITRACE_CHILD_PROCESS

* libomnitrace library.cpp updates

- basic_bundle for fini metrics
- handle finalization from child process

* sampling updates

- sampling::shutdown handles when child process

* Add example and test using fork

* Update run-ci script to support not submitting

* Tweak test envs

* Update build flags when codecov enabled

* remove unnecessary includes of sampling header

* Replace mpi copy/fini static lambda with free-funcs

* Update codecov job

* Fix OMPT segfaults after finalization

* Miscellaneous updates after rebase

* fixes for causal profiling

* revert some run-ci.sh changes

* Disable storing env in sampling::shutdown

* formatting fix

* Update timemory submodule

- fixed occasional synchronization issues with allocator offloading
- exclude protozero:: from internal samples

* improve root/child process detection

- avoid omnitrace_finalize in MPI when child process
- revert some testing tweaks

source/lib/omnitrace/library/thread_deleter.cpp

@@ -21,6 +21,7 @@
 // SOFTWARE.
 
 #include "library/thread_deleter.hpp"
+#include "api.hpp"
 #include "core/utility.hpp"
 #include "library/components/pthread_create_gotcha.hpp"
 #include "library/thread_info.hpp"
@@ -35,10 +36,22 @@ template struct component_bundle_cache<instrumentation_bundle_t>;
 void
 thread_deleter<void>::operator()() const
 {
-    component::pthread_create_gotcha::shutdown(threading::get_id());
-    set_thread_state(ThreadState::Completed);
-    if(get_state() != State::Finalized && threading::get_id() == 0)
-        omnitrace_finalize_hidden();
+    // called after thread info is deleted
+    if(!thread_info::exists()) return;
+
+    const auto& _info = thread_info::get();
+    if(_info && _info->index_data)
+    {
+        auto _tid = _info->index_data->sequent_value;
+
+        component::pthread_create_gotcha::shutdown(_tid);
+        set_thread_state(ThreadState::Completed);
+        if(get_state() < State::Finalized && _tid == 0) omnitrace_finalize_hidden();
+    }
+    else
+    {
+        set_thread_state(ThreadState::Completed);
+    }
 }
 
 template struct thread_deleter<void>;