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The runtime routines described here are defined by Section 3 of the OpenMP specification in version 4.5. The routines are structured in following three parts:
Control threads, processors and the parallel environment. They have C linkage, and do not throw exceptions. | ||
|---|---|---|
| • omp_get_active_level: | Number of active parallel regions | |
| • omp_get_ancestor_thread_num: | Ancestor thread ID | |
| • omp_get_cancellation: | Whether cancellation support is enabled | |
| • omp_get_default_device: | Get the default device for target regions | |
| • omp_get_dynamic: | Dynamic teams setting | |
| • omp_get_level: | Number of parallel regions | |
| • omp_get_max_active_levels: | Maximum number of active regions | |
| • omp_get_max_task_priority: | Maximum task priority value that can be set | |
| • omp_get_max_threads: | Maximum number of threads of parallel region | |
| • omp_get_nested: | Nested parallel regions | |
| • omp_get_num_devices: | Number of target devices | |
| • omp_get_num_procs: | Number of processors online | |
| • omp_get_num_teams: | Number of teams | |
| • omp_get_num_threads: | Size of the active team | |
| • omp_get_proc_bind: | Whether theads may be moved between CPUs | |
| • omp_get_schedule: | Obtain the runtime scheduling method | |
| • omp_get_team_num: | Get team number | |
| • omp_get_team_size: | Number of threads in a team | |
| • omp_get_thread_limit: | Maximum number of threads | |
| • omp_get_thread_num: | Current thread ID | |
| • omp_in_parallel: | Whether a parallel region is active | |
| • omp_in_final: | Whether in final or included task region | |
| • omp_is_initial_device: | Whether executing on the host device | |
| • omp_set_default_device: | Set the default device for target regions | |
| • omp_set_dynamic: | Enable/disable dynamic teams | |
| • omp_set_max_active_levels: | Limits the number of active parallel regions | |
| • omp_set_nested: | Enable/disable nested parallel regions | |
| • omp_set_num_threads: | Set upper team size limit | |
| • omp_set_schedule: | Set the runtime scheduling method | |
Initialize, set, test, unset and destroy simple and nested locks. | ||
| • omp_init_lock: | Initialize simple lock | |
| • omp_set_lock: | Wait for and set simple lock | |
| • omp_test_lock: | Test and set simple lock if available | |
| • omp_unset_lock: | Unset simple lock | |
| • omp_destroy_lock: | Destroy simple lock | |
| • omp_init_nest_lock: | Initialize nested lock | |
| • omp_set_nest_lock: | Wait for and set simple lock | |
| • omp_test_nest_lock: | Test and set nested lock if available | |
| • omp_unset_nest_lock: | Unset nested lock | |
| • omp_destroy_nest_lock: | Destroy nested lock | |
Portable, thread-based, wall clock timer. | ||
| • omp_get_wtick: | Get timer precision. | |
| • omp_get_wtime: | Elapsed wall clock time. | |
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