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2.13 omp_get_thread_num – Current thread ID

Description:
Returns a unique thread identification number within the current team. In a sequential parts of the program, omp_get_thread_num always returns 0. In parallel regions the return value varies from 0 to omp_get_num_threads-1 inclusive. The return value of the master thread of a team is always 0.
C/C++:

Prototype: int omp_get_thread_num(void);

Fortran:

Interface: integer function omp_get_thread_num()

See also:
omp_get_num_threads, omp_get_ancestor_thread_num
Reference:
OpenMP specifications v3.1, section 3.2.4.