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/process_sampler.cpp

@@ -26,7 +26,6 @@
 #include "library/cpu_freq.hpp"
 #include "library/rocm_smi.hpp"
 #include "library/runtime.hpp"
-#include "library/sampling.hpp"
 
 #include <memory>
 #include <vector>
@@ -95,11 +94,11 @@ sampler::poll(std::atomic<State>* _state, nsec_t _interval, promise_t* _ready)
     auto _now = std::chrono::steady_clock::now();
     auto _end =
         _now + std::chrono::nanoseconds{ static_cast<uint64_t>(_duration * units::sec) };
-    while(_state && _state->load() != State::Finalized && get_state() != State::Finalized)
+    while(_state && _state->load() < State::Finalized && get_state() < State::Finalized)
     {
         std::this_thread::sleep_until(_now);
         if(_state->load() != State::Active) continue;
-        if(get_state() == State::Finalized) break;
+        if(get_state() >= State::Finalized) break;
         if(get_state() != State::Active) continue;
         get_sampler_is_sampling().store(true);
         for(auto& itr : instances)
@@ -112,7 +111,7 @@ sampler::poll(std::atomic<State>* _state, nsec_t _interval, promise_t* _ready)
     // ensure this is always false
     get_sampler_is_sampling().store(false);
 
-    if(_has_duration && _now >= _end && get_state() != State::Finalized)
+    if(_has_duration && _now >= _end && get_state() < State::Finalized)
     {
         OMNITRACE_VERBOSE(
             1,