2 # Process this file with autoconf to produce a configure script.
5 AC_INIT([userspace-rcu], [0.5.4], [mathieu dot desnoyers at efficios dot com])
6 AC_CONFIG_AUX_DIR([config])
9 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
10 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
12 AC_CONFIG_SRCDIR([urcu.h])
15 AC_CONFIG_HEADERS([config.h urcu/config.h])
17 # Keep at the end to do not pollute installed header.
18 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.])
19 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
20 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
21 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
22 cmpxchg instruction.])
23 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
25 # Checks for programs.
30 # Checks for typedefs, structures, and compiler characteristics.
35 # Checks for library functions.
38 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
42 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
43 i486) ARCHTYPE="x86";;
44 i586) ARCHTYPE="x86";;
45 i686) ARCHTYPE="x86";;
46 x86_64) ARCHTYPE="x86";;
47 powerpc) ARCHTYPE="ppc" ;;
48 ppc64) ARCHTYPE="ppc" ;;
49 powerpc64) ARCHTYPE="ppc" ;;
50 ppc) ARCHTYPE="ppc" ;;
51 s390) ARCHTYPE="s390" ;;
52 s390x) ARCHTYPE="s390" ;;
53 sparc64) ARCHTYPE="sparc64" ;;
54 alpha*) ARCHTYPE="alpha" ;;
55 ia64) ARCHTYPE="gcc" ;;
56 arm*) ARCHTYPE="arm" ;;
57 *) ARCHTYPE="unknown";;
60 if test "x$ARCHTYPE" = "xarm" ; then
61 AC_MSG_CHECKING([checking for dmb instruction])
66 asm volatile("dmb":::"memory");
70 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
79 UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
80 ARCHSRC=urcu/arch_$ARCHTYPE.h
81 if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
82 APISRC=tests/api_gcc.h
84 APISRC=tests/api_$ARCHTYPE.h
86 if test "$ARCHTYPE" == "armv7l"; then
87 CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
94 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
95 #For now, using lock; addl compatibility mode even for i686, because the
96 #Pentium III is seen as a i686, but lacks mfence instruction.
97 #Only using fence for x86_64.
98 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
100 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
105 AC_MSG_CHECKING([sys_futex()])
108 #include <sys/syscall.h>
112 #error "futexes not available"
117 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
127 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
129 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
132 if test "x$SUBARCHTYPE" = xx86compat; then
134 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
139 AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
140 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
143 if test "$def_smp_support" = "no"; then
144 echo "SMP support disabled."
147 AC_DEFINE([CONFIG_RCU_SMP], [1])
149 echo "SMP support enabled."
153 # From the sched_setaffinity(2)'s man page:
155 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
156 # The library interfaces were introduced in glibc 2.3. Initially, the
157 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
158 # the cpuset size argument was removed, but this argument was
159 # restored in glibc 2.3.4.
162 # In addition to that, some vendors ported the system call to 2.4
165 # Furthermore, when the function first appeared, the MASK argument was
166 # an unsigned long pointer, while later it was made into a cpu_set_t
167 # pointer. Systems that have the cpu_set_t version also should have
168 # the CPU_ZERO, CPU_SET, etc. macros.
170 # All this mess means we have to cater for at least 3 different
171 # sched_setaffinity prototypes:
174 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
175 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
176 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
179 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
180 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
181 dnl sched_setaffinity bits differently.
183 CFLAGS="$CFLAGS -D_GNU_SOURCE"
185 # First check if the function is available at all.
188 [ # Okay, we have it. Check if also have cpu_set_t. If we don't,
189 # then we have the first version using unsigned long, and no
190 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
191 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
192 # should also be present, but we confirm nonetheless.
196 [ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
197 AC_MSG_CHECKING([whether CPU_ZERO works])
198 AH_TEMPLATE([HAVE_CPU_ZERO],
199 [Define to 1 if we have CPU_ZERO and if it works])
204 [cpu_set_t foo; CPU_ZERO (&foo);])
207 AC_DEFINE(HAVE_CPU_ZERO, 1)
210 [AC_MSG_RESULT([no])]
213 # Check how many arguments does sched_setaffinity take.
215 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
218 [#include <sched.h>],
219 [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
221 [sched_set_affinity_args=3],
222 [sched_set_affinity_args=2])
223 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
224 [Define to sched_setaffinity's number of arguments.])
225 AC_MSG_RESULT([$sched_set_affinity_args])
227 [ # No cpu_set_t, always 3 args.
228 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
238 urcu/uatomic_arch.h:$UATOMICSRC