PAPI_thread_init - Online Linux Manual PageSection : 3
Updated : September, 2004
Source : PAPI Programmer's Reference
Note : PAPI

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NAMEPAPI_thread_init − initialize thread support in the PAPI library

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SYNOPSISC 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)

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DESCRIPTIONPAPI_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.

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ARGUMENTShandle" -- Pointer to a function that returns current thread ID.

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RETURN VALUESPAPI_OK"  The call returned successfully. PAPI_EINVAL"  One or more of the arguments is invalid.

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

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BUGSThis function has no known bugs.

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SEE ALSOPAPI_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)" 0

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