dnl PAC_ARG_THREAD_PACKAGE
dnl  - Provide configure option to select a thread package. Defaults to posix.
AC_DEFUN([PAC_ARG_THREAD_PACKAGE], [
     AC_ARG_WITH([thread-package],
     [  --with-thread-package=package     Thread package to use. Supported thread packages include:
        posix or pthreads - POSIX threads (default, if required)
        solaris - Solaris threads (Solaris OS only)
        abt or argobots - Argobots threads
        win - windows threads
        uti - POSIX threads plus Utility Thread Offloading library
        none - no threads
     ],,with_thread_package=posix)])

dnl PAC_ARG_POSIX_MUTEX
dnl  - Provide configure option to select alternate mutex when posix thread package used. Defaults is to use
dnl    pthread mutex.
AC_DEFUN([PAC_ARG_POSIX_MUTEX], [
     AC_ARG_WITH([posix-mutex],
     [  --with-posix-mutex=option     Posix thread mutex to use. Supported options include:
        native - pthread mutex (default)
        ticketlock - use ticketlock, a fair lock based on atomics and busyloop
     ],,with_posix_mutex=native)])