#include <papi.h>
int PAPI_state( int EventSet, int * status );

EventSet -- an integer handle for a PAPI event set as created by PAPI_create_eventset
status -- an integer containing a boolean combination of one or more of the following nonzero constants as defined in the PAPI header file papi.h:

• PAPI_STOPPED -- EventSet is stopped
• PAPI_RUNNING -- EventSet is running
• PAPI_PAUSED -- EventSet temporarily disabled by the library
• PAPI_NOT_INIT -- EventSet defined, but not initialized
• PAPI_OVERFLOWING -- EventSet has overflowing enabled
• PAPI_PROFILING -- EventSet has profiling enabled
• PAPI_MULTIPLEXING -- EventSet has multiplexing enabled
• PAPI_ACCUMULATING -- reserved for future use
• PAPI_HWPROFILING -- reserved for future use

PAPI_OK
PAPI_EINVAL One or more of the arguments is invalid.
PAPI_ENOEVST The EventSet specified does not exist.

*  int EventSet = PAPI_NULL;
*  int status = 0;
*  int ret;
*  
*  ret = PAPI_create_eventset(&EventSet);
*  if (ret != PAPI_OK) handle_error(ret);
*  
*  // Add Total Instructions Executed to our EventSet
*  ret = PAPI_add_event(EventSet, PAPI_TOT_INS);
*  if (ret != PAPI_OK) handle_error(ret);
*  
*  // Start counting
*  ret = PAPI_state(EventSet, &status);
*  if (ret != PAPI_OK) handle_error(ret);
*  printf("State is now %d0,status);
*  ret = PAPI_start(EventSet);
*  if (ret != PAPI_OK) handle_error(ret);
*  ret = PAPI_state(EventSet, &status);
*  if (ret != PAPI_OK) handle_error(ret);
*  printf("State is now %d0,status);
*  

PAPI_stop PAPI_start