COMP: Remove obsolete and unused PThreads requirement

Considering that in VegaFEM v4.0, pthreads was replaced with
Intel TBB, this commit removes the references to "pthread" and
also removes the corresponding custom CMake module.

See http://barbic.usc.edu/vega/download.html

CMake/FindPThreads.cmake

-find_path(PTHREAD_INCLUDE_DIR
-    pthread.h
-    )
-set(PTHREAD_INCLUDE_DIR ${PTHREAD_INCLUDE_DIR})
-
-find_library(PTHREAD_RELEASE_LIBRARY
-  NAMES
-    pthread
-    libpthread
-    )
-if (EXISTS ${PTHREAD_RELEASE_LIBRARY})
-  list(APPEND PTHREAD_LIBRARIES optimized ${PTHREAD_RELEASE_LIBRARY})
-endif()
-find_library(PTHREAD_DEBUG_LIBRARY
-  NAMES
-    pthreadd
-    libpthreadd
-    )
-if (EXISTS ${PTHREAD_DEBUG_LIBRARY})
-  list(APPEND PTHREAD_LIBRARIES debug ${PTHREAD_DEBUG_LIBRARY})
-endif()
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(PTHREAD
-  REQUIRED_VARS
-    PTHREAD_INCLUDE_DIR
-    PTHREAD_LIBRARIES)
-
-mark_as_advanced(
-  PTHREAD_INCLUDE_DIR
-  PTHREAD_DEBUG_LIBRARY
-  PTHREAD_RELEASE_LIBRARY)
-
-if(PTHREAD_FOUND AND NOT TARGET Threads::Threads)
-  add_library(Threads::Threads INTERFACE IMPORTED)
-  target_include_directories(Threads::Threads INTERFACE "${PTHREAD_INCLUDE_DIR}")
-  if (EXISTS ${PTHREAD_DEBUG_LIBRARY})
-    target_link_libraries(Threads::Threads INTERFACE debug ${PTHREAD_DEBUG_LIBRARY})
-  endif()
-  if (EXISTS ${PTHREAD_RELEASE_LIBRARY})
-    target_link_libraries(Threads::Threads INTERFACE optimized ${PTHREAD_RELEASE_LIBRARY})
-  endif()
-endif()

CMake/VegaFEMConfig.cmake.in

-# Add access to dependencies Find<package>.cmake files
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/CMake)
-
-
-set(VegaFEM_ENABLE_PTHREADS_SUPPORT @VegaFEM_ENABLE_PTHREADS_SUPPORT@)
-if(VegaFEM_ENABLE_PTHREADS_SUPPORT)
-  if(WIN32)
-    find_package(PThreads REQUIRED)
-  else()
-    find_package(Threads REQUIRED)
-  endif()
-endif()
-
-# Remove access to those dependencies
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/CMake)
-
 include("${CMAKE_CURRENT_LIST_DIR}/VegaFEMTargets.cmake")

CMakeLists.txt

@@ -32,8 +32,6 @@ option(VegaFEM_BUILD_RIGID_BODIES "Build Rigid body support" OFF)
 
 option(VegaFEM_ENABLE_OpenGL_SUPPORT "Should modules that require OpenGL be enabled?" ON)
 
-option(VegaFEM_ENABLE_PTHREADS_SUPPORT "Use multithreading (pthread)" ON)
-
 option(VegaFEM_ENABLE_ExpoKit_SUPPORT "Should matrix classes use ExpoKit for exponentiation?" OFF)
 # TODO: define USE_EXPOKIT if enabled
 
@@ -220,20 +218,6 @@ if (VegaFEM_ENABLE_OpenGL_SUPPORT)
   endif()
 endif()
 
-if(VegaFEM_ENABLE_PTHREADS_SUPPORT)
-  if(WIN32)
-    set(THREADS_USE_PTHREADS_WIN32 1)
-    find_package(PThreads REQUIRED)
-    configure_file(
-      CMake/FindPThreads.cmake
-      "${CMAKE_CURRENT_BINARY_DIR}/CMake/FindPThreads.cmake"
-      COPYONLY
-    )
-  else()
-    find_package(Threads REQUIRED)
-  endif()
-endif()
-
 
 
 add_subdirectory(libraries)

libraries/clothBW/CMakeLists.txt

@@ -8,11 +8,6 @@ set(clothbw_headers
   clothBWFromObjMesh.h
 )
 
-# if(VegaFEM_ENABLE_PTHREADS_SUPPORT)
-#   list(APPEND clothbw_headers clothBWMT.h)
-#   list(APPEND clothbw_sources clothBWMT.cpp)
-# endif()
-
 vega_add_library(clothBW
   SOURCES
     ${clothbw_sources}
@@ -25,5 +20,4 @@ target_link_libraries(clothBW
     objMesh
     minivector
     sparseMatrix
-    #Threads::Threads
 )

libraries/glslPhong/CMakeLists.txt

@@ -7,5 +7,4 @@ vega_add_library(glslPhong
 target_link_libraries(glslPhong
   PUBLIC
     ${OPENGL_LIBRARIES}
-    Threads::Threads
 )

libraries/isotropicHyperelasticFEM/CMakeLists.txt

@@ -22,12 +22,6 @@ set(isotropichyperelasticfem_hdrs
     neoHookeanIsotropicMaterial.h
     )
 
-    
-#if(VegaFEM_ENABLE_PTHREADS_SUPPORT)
-#  list(APPEND isotropichyperelasticfem_hdrs isotropicHyperelasticFEMMT.h)
-#  list(APPEND isotropichyperelasticfem_srcs isotropicHyperelasticFEMMT.cpp)
-#endif()
-
 vega_add_library(isotropicHyperelasticFEM
   SOURCES
     ${isotropichyperelasticfem_srcs}
@@ -39,5 +33,4 @@ target_link_libraries(isotropicHyperelasticFEM
     minivector 
     volumetricMesh 
     sparseMatrix
-    Threads::Threads
 )

libraries/massSpringSystem/CMakeLists.txt

@@ -17,11 +17,6 @@ set(massspringsystem_hdrs
     massSpringSystemFromTetMeshConfigFile.h
 )
 
-# if(VegaFEM_ENABLE_PTHREADS_SUPPORT)
-#   list(APPEND massspringsystem_srcs massSpringSystemMT.cpp)
-#   list(APPEND massspringsystem_hdrs massSpringSystemMT.h)
-# endif()
-
 if (VegaFEM_ENABLE_OpenGL_SUPPORT)
   list(APPEND massspringsystem_srcs renderSprings.cpp)
   list(APPEND massspringsystem_hdrs renderSprings.h)
@@ -39,7 +34,6 @@ target_link_libraries(massSpringSystem
     volumetricMesh
     configFile
     sparseMatrix
-    Threads::Threads
   INTERFACE
     minivector
 )

libraries/matrix/CMakeLists.txt

@@ -32,12 +32,8 @@ vega_add_library(matrix
     ${matrix_hdrs}
 )
 
-# target_compile_options(matrix PUBLIC -lpthread -lm -liomp5 -lgfortran -Wl,--no-as-needed -m64 -ldl)
-
 target_compile_options(matrix PUBLIC -Wl,--no-as-needed -m64)
 
-# set (CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-as-needed")
-
 target_link_libraries(matrix
   PUBLIC
     matrixIO

libraries/stvk/CMakeLists.txt

@@ -22,15 +22,6 @@ set(stvk_hdrs
     StVKTetHighMemoryABCD.h
 )
 
-# if(VegaFEM_ENABLE_PTHREADS_SUPPORT)
-#   list(APPEND stvk_srcs
-#     StVKInternalForcesMT.cpp
-#     StVKStiffnessMatrixMT.cpp)
-#   list(APPEND stvk_hdrs
-#     StVKInternalForcesMT.h
-#     StVKStiffnessMatrixMT.h)
-# endif()
-
 vega_add_library(stvk
   SOURCES
     ${stvk_srcs}
@@ -42,5 +33,4 @@ target_link_libraries(stvk
     minivector
     volumetricMesh
     sparseMatrix
-    Threads::Threads
 )