PGI Fortran Reference manual - The Portland Group

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OpenMP Directives for FortranRuntime Library Routines with ExamplesReturns .TRUE. if called from within a parallel region and .FALSE. if called outside of a parallel region. When calledfrom within a parallel region that is serialized, for example in the presence of an IF clause evaluating .FALSE., the functionreturns .FALSE..Fortranomp_in_parallelinteger function omp_in_final()Returns whether or not the call is within a parallel region.Returns .TRUE. if called from within a parallel region and .FALSE. if called outside of a parallel region. When calledfrom within a parallel region that is serialized, for example in the presence of an IF clause evaluating .FALSE., the functionreturns .FALSE..Fortranomp_set_dynamiclogical function omp_in_parallel()Allows automatic dynamic adjustment of the number of threads used for execution of parallel regions.This function is recognized, but currently has no effect.Fortranomp_get_dynamicsubroutine omp_set_dynamic(scalar_logical_exp)Allows the user to query whether automatic dynamic adjustment of the number of threads used for execution of parallel regions isenabled.This function is recognized, but currently always returns .FALSE..Fortranomp_set_nestedlogical function omp_get_dynamic()Allows enabling/disabling of nested parallel regions.Fortransubroutine omp_set_nested(nested)logical nestedomp_get_nestedAllows the user to query whether dynamic adjustment of the number of threads available for execution of parallel regions isenabled.Fortranlogical function omp_get_nested()omp_set_scheduleSet the value of the run_sched_var.Fortransubroutine omp_set_schedule(kind, modifier)include ‘omp_lib_kinds.h’integer (kind=omp_sched_kind) kindinteger modifieromp_get_scheduleRetrieve the value of the run_sched_var.Fortransubroutine omp_get_schedule(kind, modifier)include ‘omp_lib_kinds.h’integer (kind=omp_sched_kind) kindinteger modifierPGI Fortran Reference Guide 182
OpenMP Directives for FortranRuntime Library Routines with Examplesomp_get_wtimeReturns the elapsed wall clock time, in seconds, as a DOUBLE PRECISION value.Times returned are per-thread times, and are not necessarily globally consistent across all threads.Fortran double precision function omp_get_wtime()omp_get_wtickReturns the resolution of omp_get_wtime(), in seconds, as a DOUBLE PRECISION value.Fortrandouble precision function omp_get_wtick()omp_init_lockInitializes a lock associated with the variable lock for use in subsequent calls to lock routines.The initial state of the lock is unlocked. If the variable is already associated with a lock, it is illegal to make a call to this routine.Fortranomp_destroy_locksubroutine omp_init_lock(lock)include ‘omp_lib_kinds.h’integer(kind=omp_lock_kind) lockDisassociates a lock associated with the variable.Fortransubroutine omp_destroy_lock(lock)include ‘omp_lib_kinds.h’integer(kind=omp_lock_kind) lockomp_set_lockCauses the calling thread to wait until the specified lock is available.The thread gains ownership of the lock when it is available. If the variable is not already associated with a lock, it is illegal to makea call to this routine.Fortranomp_unset_locksubroutine omp_set_lock(lock)include ‘omp_lib_kinds.h’integer(kind=omp_lock_kind) lockCauses the calling thread to release ownership of the lock associated with integer_var.If the variable is not already associated with a lock, it is illegal to make a call to this routine.Fortranomp_test_locksubroutine omp_unset_lock(lock)include ‘omp_lib_kinds.h’integer(kind=omp_lock_kind) lockCauses the calling thread to try to gain ownership of the lock associated with the variable.The function returns .TRUE. if the thread gains ownership of the lock; otherwise it returns .FALSE..If the variable is not already associated with a lock, it is illegal to make a call to this routine.Fortranlogical function omp_test_lock(lock)include ‘omp_lib_kinds.h’integer(kind=omp_lock_kind) lockPGI Fortran Reference Guide 183
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PREFACEThis manual describes the Po
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PrefacePGI Fortran Reference Guide
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Language Overview‣ Fixed source f
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