GNU libgomp: omp_get_thread_num

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### 2.19 `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 specification v4.0, Section 3.2.4.