Annotation of embedaddon/trafshow/aclocal.m4, revision 1.1
1.1 ! misho 1: dnl Available from the GNU Autoconf Macro Archive at:
! 2: dnl http://www.gnu.org/software/ac-archive/htmldoc/acx_pthread.html
! 3: dnl
! 4: AC_DEFUN([ACX_PTHREAD], [
! 5: AC_REQUIRE([AC_CANONICAL_HOST])
! 6: AC_LANG_SAVE
! 7: AC_LANG_C
! 8: acx_pthread_ok=no
! 9:
! 10: # We used to check for pthread.h first, but this fails if pthread.h
! 11: # requires special compiler flags (e.g. on True64 or Sequent).
! 12: # It gets checked for in the link test anyway.
! 13:
! 14: # First of all, check if the user has set any of the PTHREAD_LIBS,
! 15: # etcetera environment variables, and if threads linking works using
! 16: # them:
! 17: if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
! 18: save_CFLAGS="$CFLAGS"
! 19: CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
! 20: save_LIBS="$LIBS"
! 21: LIBS="$PTHREAD_LIBS $LIBS"
! 22: AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
! 23: AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
! 24: AC_MSG_RESULT($acx_pthread_ok)
! 25: if test x"$acx_pthread_ok" = xno; then
! 26: PTHREAD_LIBS=""
! 27: PTHREAD_CFLAGS=""
! 28: fi
! 29: LIBS="$save_LIBS"
! 30: CFLAGS="$save_CFLAGS"
! 31: fi
! 32:
! 33: # We must check for the threads library under a number of different
! 34: # names; the ordering is very important because some systems
! 35: # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
! 36: # libraries is broken (non-POSIX).
! 37:
! 38: # Create a list of thread flags to try. Items starting with a "-" are
! 39: # C compiler flags, and other items are library names, except for "none"
! 40: # which indicates that we try without any flags at all, and "pthread-config"
! 41: # which is a program returning the flags for the Pth emulation library.
! 42:
! 43: acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
! 44:
! 45: # The ordering *is* (sometimes) important. Some notes on the
! 46: # individual items follow:
! 47:
! 48: # pthreads: AIX (must check this before -lpthread)
! 49: # none: in case threads are in libc; should be tried before -Kthread and
! 50: # other compiler flags to prevent continual compiler warnings
! 51: # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
! 52: # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
! 53: # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
! 54: # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
! 55: # -pthreads: Solaris/gcc
! 56: # -mthreads: Mingw32/gcc, Lynx/gcc
! 57: # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
! 58: # doesn't hurt to check since this sometimes defines pthreads too;
! 59: # also defines -D_REENTRANT)
! 60: # pthread: Linux, etcetera
! 61: # --thread-safe: KAI C++
! 62: # pthread-config: use pthread-config program (for GNU Pth library)
! 63:
! 64: case "${host_cpu}-${host_os}" in
! 65: *solaris*)
! 66:
! 67: # On Solaris (at least, for some versions), libc contains stubbed
! 68: # (non-functional) versions of the pthreads routines, so link-based
! 69: # tests will erroneously succeed. (We need to link with -pthread or
! 70: # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
! 71: # a function called by this macro, so we could check for that, but
! 72: # who knows whether they'll stub that too in a future libc.) So,
! 73: # we'll just look for -pthreads and -lpthread first:
! 74:
! 75: acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
! 76: ;;
! 77: esac
! 78:
! 79: if test x"$acx_pthread_ok" = xno; then
! 80: for flag in $acx_pthread_flags; do
! 81:
! 82: case $flag in
! 83: none)
! 84: AC_MSG_CHECKING([whether pthreads work without any flags])
! 85: ;;
! 86:
! 87: -*)
! 88: AC_MSG_CHECKING([whether pthreads work with $flag])
! 89: PTHREAD_CFLAGS="$flag"
! 90: ;;
! 91:
! 92: pthread-config)
! 93: AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
! 94: if test x"$acx_pthread_config" = xno; then continue; fi
! 95: PTHREAD_CFLAGS="`pthread-config --cflags`"
! 96: PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
! 97: ;;
! 98:
! 99: *)
! 100: AC_MSG_CHECKING([for the pthreads library -l$flag])
! 101: PTHREAD_LIBS="-l$flag"
! 102: ;;
! 103: esac
! 104:
! 105: save_LIBS="$LIBS"
! 106: save_CFLAGS="$CFLAGS"
! 107: LIBS="$PTHREAD_LIBS $LIBS"
! 108: CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
! 109:
! 110: # Check for various functions. We must include pthread.h,
! 111: # since some functions may be macros. (On the Sequent, we
! 112: # need a special flag -Kthread to make this header compile.)
! 113: # We check for pthread_join because it is in -lpthread on IRIX
! 114: # while pthread_create is in libc. We check for pthread_attr_init
! 115: # due to DEC craziness with -lpthreads. We check for
! 116: # pthread_cleanup_push because it is one of the few pthread
! 117: # functions on Solaris that doesn't have a non-functional libc stub.
! 118: # We try pthread_create on general principles.
! 119: AC_TRY_LINK([#include <pthread.h>],
! 120: [pthread_t th; pthread_join(th, 0);
! 121: pthread_attr_init(0); pthread_cleanup_push(0, 0);
! 122: pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
! 123: [acx_pthread_ok=yes])
! 124:
! 125: LIBS="$save_LIBS"
! 126: CFLAGS="$save_CFLAGS"
! 127:
! 128: AC_MSG_RESULT($acx_pthread_ok)
! 129: if test "x$acx_pthread_ok" = xyes; then
! 130: break;
! 131: fi
! 132:
! 133: PTHREAD_LIBS=""
! 134: PTHREAD_CFLAGS=""
! 135: done
! 136: fi
! 137:
! 138: # Various other checks:
! 139: if test "x$acx_pthread_ok" = xyes; then
! 140: save_LIBS="$LIBS"
! 141: LIBS="$PTHREAD_LIBS $LIBS"
! 142: save_CFLAGS="$CFLAGS"
! 143: CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
! 144:
! 145: # Detect AIX lossage: threads are created detached by default
! 146: # and the JOINABLE attribute has a nonstandard name (UNDETACHED).
! 147: AC_MSG_CHECKING([for joinable pthread attribute])
! 148: AC_TRY_LINK([#include <pthread.h>],
! 149: [int attr=PTHREAD_CREATE_JOINABLE;],
! 150: ok=PTHREAD_CREATE_JOINABLE, ok=unknown)
! 151: if test x"$ok" = xunknown; then
! 152: AC_TRY_LINK([#include <pthread.h>],
! 153: [int attr=PTHREAD_CREATE_UNDETACHED;],
! 154: ok=PTHREAD_CREATE_UNDETACHED, ok=unknown)
! 155: fi
! 156: if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then
! 157: AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok,
! 158: [Define to the necessary symbol if this constant
! 159: uses a non-standard name on your system.])
! 160: fi
! 161: AC_MSG_RESULT(${ok})
! 162: if test x"$ok" = xunknown; then
! 163: AC_MSG_WARN([we do not know how to create joinable pthreads])
! 164: fi
! 165:
! 166: AC_MSG_CHECKING([if more special flags are required for pthreads])
! 167: flag=no
! 168: case "${host_cpu}-${host_os}" in
! 169: *-aix* | *-freebsd*) flag="-D_THREAD_SAFE";;
! 170: *solaris*) flag="-D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT";;
! 171: *-osf* | *-hpux*) flag="-D_REENTRANT";;
! 172: esac
! 173: AC_MSG_RESULT(${flag})
! 174: if test "x$flag" != xno; then
! 175: PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
! 176: fi
! 177:
! 178: LIBS="$save_LIBS"
! 179: CFLAGS="$save_CFLAGS"
! 180:
! 181: # More AIX lossage: must compile with cc_r
! 182: AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
! 183: else
! 184: PTHREAD_CC="$CC"
! 185: fi
! 186:
! 187: AC_SUBST(PTHREAD_LIBS)
! 188: AC_SUBST(PTHREAD_CFLAGS)
! 189: AC_SUBST(PTHREAD_CC)
! 190:
! 191: # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
! 192: if test x"$acx_pthread_ok" = xyes; then
! 193: ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
! 194: :
! 195: else
! 196: acx_pthread_ok=no
! 197: $2
! 198: fi
! 199: AC_LANG_RESTORE
! 200: ])dnl ACX_PTHREAD
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