# -----------------------------------------------------------------------------
# Programmer(s): Cody J. Balos @ LLNL
# -----------------------------------------------------------------------------
# SUNDIALS Copyright Start
# Copyright (c) 2002-2024, Lawrence Livermore National Security
# and Southern Methodist University.
# All rights reserved.
#
# See the top-level LICENSE and NOTICE files for details.
#
# SPDX-License-Identifier: BSD-3-Clause
# SUNDIALS Copyright End
# -----------------------------------------------------------------------------
# Module to find and setup Pthreads correctly.
# Created from the SundialsTPL.cmake template.
# All SUNDIALS modules that find and setup a TPL must:
#
# 1. Check to make sure the SUNDIALS configuration and the TPL is compatible.
# 2. Find the TPL.
# 3. Check if the TPL works with SUNDIALS, UNLESS the override option
# TPL_WORKS is TRUE - in this case the tests should not be performed and it
# should be assumed that the TPL works with SUNDIALS.
# -----------------------------------------------------------------------------

# -----------------------------------------------------------------------------
# Section 1: Include guard
# -----------------------------------------------------------------------------

if(NOT DEFINED SUNDIALS_PTHREAD_INCLUDED)
  set(SUNDIALS_PTHREAD_INCLUDED)
else()
  return()
endif()

# -----------------------------------------------------------------------------
# Section 2: Check to make sure options are compatible
# -----------------------------------------------------------------------------

# -----------------------------------------------------------------------------
# Section 3: Find the TPL
# -----------------------------------------------------------------------------

set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
find_package(Threads REQUIRED)

# -----------------------------------------------------------------------------
# Section 4: Test the TPL
# -----------------------------------------------------------------------------

if(CMAKE_USE_PTHREADS_INIT)
  set(PTHREADS_FOUND TRUE)
  message(STATUS "Checking if Pthreads is available -- OK")
else()
  set(PTHREADS_FOUND FALSE)
  message(STATUS "Checking if Pthreads is available... FAILED")
  message(FATAL_ERROR "Could not determine Pthreads compiler flags")
endif()