OMP_NESTED(3) Last changed: 2-24-98
NAME
omp_set_nested, omp_get_nested, OMP_SET_NESTED, OMP_GET_NESTED -
Manipulates or reports status of nested parallelism
SYNOPSIS
C/C++: (Deferred implementation)
#integer <omp_set_nested>
void omp_set_nested(integer-expression)
Fortran:
CALL OMP_SET_NESTED(logical-expression)
IMPLEMENTATION
IRIX systems
STANDARDS
OpenMP Fortran API
DESCRIPTION
Fortran differences are noted in parentheses in the following
descriptions.
omp_set_nested, OMP_SET_NESTED
This procedure enables or disables nested parallelism.
If integer-expression (logical-expression) evaluates to zero (FALSE),
which is the default, nexted parallelism is disabled and nested
parallel regions are seialized and executed by the current thread. If
set to non-zero (TRUE), nested parallelism is enabled and parallel
regions that are nested may deploy additional threads to form the
team. This call has precedence over the OMP_NESTED environment
variable. When nested parallelism is enabled, the number of threads
used to execute the nested parallel regions are implementation
dependent. As a result, implementations that are compliant to OpenMP
are allowed to serialize nested parallel regions even when nested
parallelism is enabled.
ENVIRONMENT VARIABLES
OMP_NESTED
This variable enables or disables nested parallelism. If set to
TRUE, nested parallelism is enabled; if it is set to FALSE, it is
disabled. The default value is FALSE.
SEE ALSOomp_lock(3) on how to manipulate locks
omp_threads(3) for runtime library procedures used to set, call or
return numbers of threads
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