# Process this file with autoconf to produce a configure script.
-AC_INIT([userspace-rcu], [0.2.3-alpha], [mathieu dot desnoyers at polymtl dot ca])
+AC_INIT([userspace-rcu],[0.7.2],[mathieu dot desnoyers at efficios dot com])
+
+# Following the numbering scheme proposed by libtool for the library version
+# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
+AC_SUBST([URCU_LIBRARY_VERSION], [1:0:0])
+
AC_CONFIG_AUX_DIR([config])
+AC_CONFIG_MACRO_DIR([config])
AC_CANONICAL_TARGET
AC_CANONICAL_HOST
AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
+m4_include([config/ax_tls.m4])
+
AC_CONFIG_SRCDIR([urcu.h])
AC_CONFIG_HEADERS([config.h urcu/config.h])
-# Keep at the end to do not pollute installed header.
-AH_TEMPLATE([CONFIG_URCU_SMP], [Enable SMP support. With SMP support enabled, uniprocessors are also supported. With SMP support disabled, UP systems work fine, but the behavior of SMP systems is undefined.])
-AH_TEMPLATE([CONFIG_URCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
-AH_TEMPLATE([CONFIG_URCU_HAVE_FUTEX], [Defined when on a system with futex support.])
+AH_TEMPLATE([CONFIG_RCU_SMP], [Enable SMP support. With SMP support enabled, uniprocessors are also supported. With SMP support disabled, UP systems work fine, but the behavior of SMP systems is undefined.])
+AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
+AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
+AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
+AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
+AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
+
+AX_TLS([AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $ac_cv_tls)], [])
# Checks for programs.
AC_PROG_CC
AC_PROG_MAKE_SET
-AC_PROG_LIBTOOL
+LT_INIT
# Checks for typedefs, structures, and compiler characteristics.
AC_C_INLINE
# Checks for library functions.
AC_FUNC_MALLOC
AC_FUNC_MMAP
-AC_CHECK_FUNCS([bzero gettimeofday munmap strtoul])
+AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
# Find arch type
-case $target_cpu in
- i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
- i486) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
- i586) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
- i686) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
- x86_64) ARCHTYPE="x86";;
- powerpc) ARCHTYPE="ppc" ;;
- ppc64) ARCHTYPE="ppc" ;;
- powerpc64) ARCHTYPE="ppc" ;;
- ppc) ARCHTYPE="ppc" ;;
- s390) ARCHTYPE="s390" ;;
- s390x) ARCHTYPE="s390" ;;
- *) ARCHTYPE="unknown";;
-esac
-
-if test "$ARCHTYPE" = "unknown"; then
- AC_MSG_ERROR([Unable to detect the architecture.])
-fi
+AS_CASE([$host_cpu],
+ [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
+ [i486], [ARCHTYPE="x86"],
+ [i586], [ARCHTYPE="x86"],
+ [i686], [ARCHTYPE="x86"],
+ [amd64], [ARCHTYPE="x86"],
+ [x86_64], [ARCHTYPE="x86"],
+ [powerpc], [ARCHTYPE="ppc"],
+ [ppc64], [ARCHTYPE="ppc"],
+ [powerpc64], [ARCHTYPE="ppc"],
+ [ppc], [ARCHTYPE="ppc"],
+ [s390], [ARCHTYPE="s390"],
+ [s390x], [ARCHTYPE="s390"],
+ [sparc64], [ARCHTYPE="sparc64"],
+ [alpha*], [ARCHTYPE="alpha"],
+ [ia64], [ARCHTYPE="gcc"],
+ [arm*], [ARCHTYPE="arm"],
+ [ARCHTYPE="unknown"]
+)
+
AC_SUBST(ARCHTYPE)
AC_SUBST(SUBARCHTYPE)
-[
-if test "x$ARCHTYPE" = "xx86" -a "x$target_cpu" != "xi386" -a "x$target_cpu" != "xi486" -a "x$target_cpu" != "xi586"; then
-]
- AC_DEFINE([CONFIG_URCU_HAVE_FENCE], [1])
-[
-fi
-]
-
-AC_MSG_CHECKING([sys_futex()])
-AC_TRY_COMPILE(
-[
-#include <sys/syscall.h>
-],
-[
-#ifndef __NR_futex
-#error "futexes not available"
-#endif
-],
-[
+UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
+ARCHSRC=urcu/arch/$ARCHTYPE.h
+
+AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
+ AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
+])
+
+AS_IF([test "$host_cpu" = "armv7l"],[
+ CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
+])
+
+# ARM-specific checks
+AS_IF([test "x$ARCHTYPE" = "xarm"],[
+ AC_MSG_CHECKING([for dmb instruction])
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+ int main()
+ {
+ asm volatile("dmb":::"memory");
+ return 0;
+ }
+ ]])
+ ],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
+ ],[
+ AC_MSG_RESULT([no])
+ ])
+])
+
+# x86-specific checks
+AS_IF([test "x$ARCHTYPE" = "xx86"],[
+ AC_MSG_CHECKING([if architecture really supports the mfence instruction])
+ #For now, using lock; addl compatibility mode even for i686, because the
+ #Pentium III is seen as a i686, but lacks mfence instruction.
+ #Only using fence for x86_64.
+ AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
+ ],[
+ AC_MSG_RESULT([no])
+ ])
+])
+
+# Check if sys_futex() is available
+AC_MSG_CHECKING([for sys_futex()])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+ #include <sys/syscall.h>
+ #ifndef __NR_futex
+ #error "futexes not available"
+ #endif
+ ]])
+],[
AC_MSG_RESULT([yes])
- AC_DEFINE([CONFIG_URCU_HAVE_FUTEX], [1])
+ AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
compat_futex_test=0
-]
-,
-[
+],[
AC_MSG_RESULT([no])
compat_futex_test=1
-]
-)
-
-AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
-
-AM_CONDITIONAL([GCC_API], [test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc])
-
-AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
+])
-AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
- on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
+AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
+AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
+
+# smp-support configure option
+AC_ARG_ENABLE([smp-support],
+ AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
+ [def_smp_support=$enableval],
+ [def_smp_support="yes"])
+AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
+
+
+# From the sched_setaffinity(2)'s man page:
+# ~~~~
+# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
+# The library interfaces were introduced in glibc 2.3. Initially, the
+# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
+# the cpuset size argument was removed, but this argument was
+# restored in glibc 2.3.4.
+# ~~~~
+
+# In addition to that, some vendors ported the system call to 2.4
+# kernels.
+
+# Furthermore, when the function first appeared, the MASK argument was
+# an unsigned long pointer, while later it was made into a cpu_set_t
+# pointer. Systems that have the cpu_set_t version also should have
+# the CPU_ZERO, CPU_SET, etc. macros.
+
+# All this mess means we have to cater for at least 3 different
+# sched_setaffinity prototypes:
+
+# ~~~~
+# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
+# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
+# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
+# ~~~~
+
+# Since we define _GNU_SOURCE in the sources, must do so too in the
+# autoconf tests, as defining _GNU_SOURCE or not exposes
+# sched_setaffinity bits differently.
+saved_CFLAGS=$CFLAGS
+CFLAGS="$CFLAGS -D_GNU_SOURCE"
+
+# First check if the function is available at all.
+AC_CHECK_FUNCS([sched_setaffinity],[
+ # Okay, we have it. Check if also have cpu_set_t. If we don't,
+ # then we have the first version using unsigned long, and no
+ # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
+ # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
+ # should also be present, but we confirm nonetheless.
+
+ AC_CHECK_TYPES([cpu_set_t],[
+ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
+ AC_MSG_CHECKING([whether CPU_ZERO works])
+ AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+ #define _GNU_SOURCE
+ #include <sched.h>
+ int main()
+ {
+ cpu_set_t foo; CPU_ZERO (&foo);
+ return 0;
+ }
+ ]])
+ ],[
+ # Works!
+ AC_DEFINE(HAVE_CPU_ZERO, 1)
+ AC_MSG_RESULT([yes])
+ ],[
+ AC_MSG_RESULT([no])
+ ])
+
+ # Check how many arguments does sched_setaffinity take.
+ # Should be 3 or 2.
+ AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+ #include <sched.h>
+ int main()
+ {
+ cpu_set_t foo;
+ sched_setaffinity (0, sizeof (foo), &foo);
+ return 0;
+ }
+ ]])
+ ],
+ [sched_set_affinity_args=3],
+ [sched_set_affinity_args=2])
+ AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
+ [Defined to sched_setaffinity's number of arguments.])
+ AC_MSG_RESULT([$sched_set_affinity_args])
+ ],[
+ # No cpu_set_t, always 3 args.
+ AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
+ ],
+ [#include <sched.h>])
+])
-[
-if test "$def_smp_support" = "no"; then
- echo "SMP support disabled."
-else
-]
- AC_DEFINE([CONFIG_URCU_SMP], [1])
-[
- echo "SMP support enabled."
-fi
-]
+CFLAGS=$saved_CFLAGS
+AC_CONFIG_LINKS([
+ urcu/arch.h:$ARCHSRC
+ urcu/uatomic.h:$UATOMICSRC
+])
AC_CONFIG_FILES([
Makefile
+ doc/Makefile
tests/Makefile
+ liburcu.pc
+ liburcu-bp.pc
+ liburcu-cds.pc
+ liburcu-qsbr.pc
+ liburcu-mb.pc
+ liburcu-signal.pc
])
AC_OUTPUT
+
+# Report on selected configure options
+AS_IF([test "x$def_smp_support" = "xyes"],[
+ AS_ECHO("SMP support enabled.")
+],[
+ AS_ECHO("SMP support disabled.")
+])
projects / urcu.git / blobdiff