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PAPI_thread_init

NAME

PAPI_thread_init - initialize thread support in the PAPI library

SYNOPSIS

C Interface

 #include papi.h
 int PAPI_thread_init (unsigned long int (*handle)());
 

Fortran Interface

 #include fpapi.h
 PAPIF_thread_init(C_INT FUNCTION handle, C_INT check)
 

DESCRIPTION

PAPI_thread_init initializes thread support in the PAPI library. Applications that make no use of threads do not need to call this routine. This function MUST return a UNIQUE thread ID for every new thread/LWP created. The OpenMP call omp_get_thread_num() violates this rule, as the underlying LWPs may have been killed off by the run-time system or by a call to omp_set_num_threads(). In that case, it may still possible to use omp_get_thread_num() in conjunction with PAPI_unregister_thread() when the OpenMP thread has finished. However it is much better to use the underlying thread subsystem's call, which is pthread_self() on Linux platforms.

ARGUMENTS

handle -- Pointer to a function that returns current thread ID.

RETURN VALUES

PAPI_OK

The call returned successfully.

PAPI_EINVAL

One or more of the arguments is invalid.

EXAMPLES

 if (PAPI_thread_init(pthread_self) != PAPI_OK)
   exit(1);
 

BUGS

This function has no known bugs.

SEE ALSO

PAPI_thread_id(3), PAPI_list_threads(3), PAPI_get_thr_specific(3), PAPI_set_thr_specific(3), PAPI_register_thread(3), PAPI_unregister_thread (3), PAPI(3)