omp_get_thread_num (GNU libgomp)

#### 3.1.4 `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 primary 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` – Size of the active team, `omp_get_ancestor_thread_num` – Ancestor thread ID

Reference:

  OpenMP specification v4.5, Section 3.2.4.