Added a fortran routine to determine if OpenMP has been enabled. Added a python wrapper, and updated the default omp.f90 and wrffortran.pyf.

fortran/omp.f90

@@ -10,6 +10,19 @@ MODULE omp_constants
 END MODULE omp_constants
 
 
+FUNCTION fomp_enabled()
+
+    IMPLICIT NONE
+
+    !f2py threadsafe
+
+    LOGICAL :: fomp_enabled
+
+    fomp_enabled = .FALSE.
+
+END FUNCTION fomp_enabled
+
+
 SUBROUTINE fomp_set_num_threads(num_threads)
 
     IMPLICIT NONE

fortran/ompgen.F90

@@ -61,6 +61,23 @@ MODULE omp_constants
 END MODULE omp_constants
 
 
+FUNCTION fomp_enabled()
+
+    IMPLICIT NONE
+
+    !f2py threadsafe
+
+    LOGICAL :: fomp_enabled
+
+#ifdef _OPENMP
+    fomp_enabled = .TRUE.
+#else
+    fomp_enabled = .FALSE.
+#endif
+
+END FUNCTION fomp_enabled
+
+
 SUBROUTINE fomp_set_num_threads(num_threads)
 #ifdef _OPENMP
     USE omp_lib

fortran/wrffortran.pyf

@@ -42,6 +42,10 @@ python module _wrffortran ! in
             integer, parameter,optional :: fomp_lock_kind=4
             integer(kind=4), parameter,optional :: fomp_sched_auto=4
         end module omp_constants
+        function fomp_enabled() ! in :_wrffortran:omp.f90
+            threadsafe 
+            logical :: fomp_enabled
+        end function fomp_enabled
         subroutine fomp_set_num_threads(num_threads) ! in :_wrffortran:omp.f90
             threadsafe 
             integer intent(in) :: num_threads
@@ -229,7 +233,7 @@ python module _wrffortran ! in
         end subroutine dpfcalc
         subroutine dcapecalc3d(prs,tmk,qvp,ght,ter,sfp,cape,cin,cmsg,mix,mjy,mkzh,ter_follow,psafile,errstat,errmsg) ! in :_wrffortran:rip_cape.f90
             threadsafe 
-            use wrf_constants, only: tlclc2,gamma,tlclc1,rgasmd,tlclc4,g,tlclc3,thtecon3,eps,rd,cpmd,celkel,gammamd,eslcon2,eslcon1,cp,thtecon1,algerr,ezero,thtecon2
+            use wrf_constants, only: tlclc2,gamma,tlclc1,rgasmd,tlclc4,g,tlclc3,thtecon3,eps,rd,cpmd,celkel,gammamd,eslcon2,eslcon1,cp,thtecon1,ezero,thtecon2
             real(kind=8) dimension(mix,mjy,mkzh),intent(in) :: prs
             real(kind=8) dimension(mix,mjy,mkzh),intent(in),depend(mix,mjy,mkzh) :: tmk
             real(kind=8) dimension(mix,mjy,mkzh),intent(in),depend(mix,mjy,mkzh) :: qvp
@@ -249,7 +253,7 @@ python module _wrffortran ! in
         end subroutine dcapecalc3d
         subroutine dcapecalc2d(prs,tmk,qvp,ght,ter,sfp,cape,cin,cmsg,mix,mjy,mkzh,ter_follow,psafile,errstat,errmsg) ! in :_wrffortran:rip_cape.f90
             threadsafe 
-            use wrf_constants, only: tlclc2,gamma,tlclc1,rgasmd,tlclc4,g,tlclc3,thtecon3,eps,rd,cpmd,celkel,gammamd,eslcon2,eslcon1,cp,thtecon1,algerr,ezero,thtecon2
+            use wrf_constants, only: tlclc2,gamma,tlclc1,rgasmd,tlclc4,g,tlclc3,thtecon3,eps,rd,cpmd,celkel,gammamd,eslcon2,eslcon1,cp,thtecon1,ezero,thtecon2
             real(kind=8) dimension(mix,mjy,mkzh),intent(in) :: prs
             real(kind=8) dimension(mix,mjy,mkzh),intent(in),depend(mix,mjy,mkzh) :: tmk
             real(kind=8) dimension(mix,mjy,mkzh),intent(in),depend(mix,mjy,mkzh) :: qvp

src/wrf/api.py

@@ -2,7 +2,7 @@ from .config import (xarray_enabled, disable_xarray, enable_xarray,
                      cartopy_enabled, disable_cartopy, enable_cartopy,
                      basemap_enabled, disable_basemap, enable_basemap,
                      pyngl_enabled, enable_pyngl, disable_pyngl,
-                     set_cache_size, get_cache_size)
+                     set_cache_size, get_cache_size, omp_enabled)
 from .constants import (ALL_TIMES, Constants, ConversionFactors, 
                         ProjectionTypes, default_fill)
 from .destag import destagger
@@ -58,7 +58,7 @@ __all__ += ["xarray_enabled", "disable_xarray", "enable_xarray",
             "cartopy_enabled", "disable_cartopy", "enable_cartopy",
             "basemap_enabled", "disable_basemap", "enable_basemap",
             "pyngl_enabled", "enable_pyngl", "disable_pyngl",
-            "set_cache_size", "get_cache_size"]
+            "set_cache_size", "get_cache_size", "omp_enabled"]
 __all__ += ["ALL_TIMES", "Constants", "ConversionFactors", "ProjectionTypes",
             "default_fill"]
 __all__ += ["destagger"]

src/wrf/config.py

@@ -4,6 +4,8 @@ from __future__ import (absolute_import, division, print_function,
 from threading import local
 import wrapt
 
+from ._wrffortran import fomp_enabled
+
 _local_config = local()
 
 def _init_local():
@@ -199,4 +201,16 @@ def get_cache_size():
     return int(_local_config.cache_size)
     
     
+def omp_enabled():
+    """Return True if OpenMP is enabled.
+    
+    OpenMP is only enabled if compiled with OpenMP features.
+    
+    Returns:
+    
+        :obj:`bool`: True if OpenMP is enabled, otherwise False.
+    
+    """
+    
+    return True if fomp_enabled() else False
 

src/wrf/constants.py

@@ -6,7 +6,7 @@ import struct
 import numpy as np
 
 from .py3compat import viewitems
-from wrf._wrffortran import wrf_constants, omp_constants
+from ._wrffortran import wrf_constants, omp_constants
 
 #: Indicates that all times should be used in a diagnostic routine.
 ALL_TIMES = None