[FMI2] Handle the jump buffers better

The catch in try/catch needs execute, so do not return before the
jump buffers have been restored.

Also tries to detect a parent OM calling the FMU. The threadData would
be shared between the two, but the functions now set and restore the
threadData at each call if a parent (using pthread_setspecific) has
been detected.

Belonging to [master]:
  - #2116
  - OpenModelica/OpenModelica-testsuite#829

SimulationRuntime/c/fmi/FMI2ModelExchange.c

@@ -271,7 +271,7 @@ int fmi2CompletedIntegratorStep_OMC(void* in_fmi2me, double flowStates)
     fmi2_boolean_t callEventUpdate = fmi2_false;
     fmi2_boolean_t terminateSimulation = fmi2_false;
     fmi2_status_t status = fmi2_import_completed_integrator_step(FMI2ME->FMIImportInstance, fmi2_true, &callEventUpdate, &terminateSimulation);
-    if (status != fmi1_status_ok && status != fmi1_status_warning) {
+    if (status != fmi2_status_ok && status != fmi2_status_warning) {
       ModelicaFormatError("fmi2CompletedIntegratorStep failed with status : %s\n", fmi2_status_to_string(status));
     }
     return callEventUpdate;

SimulationRuntime/c/util/omc_error.c

@@ -414,11 +414,22 @@ static inline jmp_buf* getBestJumpBuffer(threadData_t *threadData)
   case ERROR_INTEGRATOR:
   case ERROR_OPTIMIZE:
 #ifndef OMC_EMCC
-    return threadData->simulationJumpBuffer;
+    if (threadData->simulationJumpBuffer) {
+      return threadData->simulationJumpBuffer;
+    }
+    fprintf(stderr, "getBestJumpBuffer got simulationJumpBuffer=%p\n", threadData->simulationJumpBuffer);
+    abort();
 #endif
   case ERROR_EVENTHANDLING:
   default:
-    return threadData->globalJumpBuffer ? threadData->globalJumpBuffer : threadData->mmc_jumper;
+    if (threadData->globalJumpBuffer) {
+      return threadData->globalJumpBuffer;
+    }
+    if (threadData->mmc_jumper) {
+      return threadData->mmc_jumper;
+    }
+    fprintf(stderr, "getBestJumpBuffer got mmc_jumper=%p, globalJumpBuffer=%p\n", threadData->globalJumpBuffer, threadData->mmc_jumper);
+    abort();
   }
 }
 

SimulationRuntime/c/util/utility.c

@@ -35,6 +35,7 @@
 #include "simulation_data.h"
 #include "simulation/options.h"
 #include <string.h>
+#include <errno.h>
 
 modelica_real real_int_pow(threadData_t *threadData, modelica_real base, modelica_integer n)
 {