2 # Process this file with autoconf to produce a configure script.
5 AC_INIT([userspace-rcu], [0.4.1], [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.])
24 # Checks for programs.
29 # Checks for typedefs, structures, and compiler characteristics.
34 # Checks for library functions.
37 AC_CHECK_FUNCS([bzero gettimeofday munmap strtoul])
41 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
42 i486) ARCHTYPE="x86";;
43 i586) ARCHTYPE="x86";;
44 i686) ARCHTYPE="x86";;
45 x86_64) ARCHTYPE="x86";;
46 powerpc) ARCHTYPE="ppc" ;;
47 ppc64) ARCHTYPE="ppc" ;;
48 powerpc64) ARCHTYPE="ppc" ;;
49 ppc) ARCHTYPE="ppc" ;;
50 s390) ARCHTYPE="s390" ;;
51 s390x) ARCHTYPE="s390" ;;
52 sparc64) ARCHTYPE="sparc64" ;;
53 alpha*) ARCHTYPE="alpha" ;;
54 *) ARCHTYPE="unknown";;
57 if test "$ARCHTYPE" = "unknown"; then
58 AC_MSG_ERROR([Unable to detect the architecture.])
60 UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
61 ARCHSRC=urcu/arch_$ARCHTYPE.h
62 if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
63 APISRC=tests/api_gcc.h
65 APISRC=tests/api_$ARCHTYPE.h
72 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
73 #For now, using lock; addl compatibility mode even for i686, because the
74 #Pentium III is seen as a i686, but lacks mfence instruction.
75 #Only using fence for x86_64.
76 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
78 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
83 AC_MSG_CHECKING([sys_futex()])
86 #include <sys/syscall.h>
90 #error "futexes not available"
95 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
105 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
107 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
110 if test "x$SUBARCHTYPE" = xx86compat; then
112 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
117 AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
118 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
121 if test "$def_smp_support" = "no"; then
122 echo "SMP support disabled."
125 AC_DEFINE([CONFIG_RCU_SMP], [1])
127 echo "SMP support enabled."
131 # From the sched_setaffinity(2)'s man page:
133 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
134 # The library interfaces were introduced in glibc 2.3. Initially, the
135 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
136 # the cpuset size argument was removed, but this argument was
137 # restored in glibc 2.3.4.
140 # In addition to that, some vendors ported the system call to 2.4
143 # Furthermore, when the function first appeared, the MASK argument was
144 # an unsigned long pointer, while later it was made into a cpu_set_t
145 # pointer. Systems that have the cpu_set_t version also should have
146 # the CPU_ZERO, CPU_SET, etc. macros.
148 # All this mess means we have to cater for at least 3 different
149 # sched_setaffinity prototypes:
152 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
153 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
154 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
157 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
158 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
159 dnl sched_setaffinity bits differently.
161 CFLAGS="$CFLAGS -D_GNU_SOURCE"
163 # First check if the function is available at all.
166 [ # Okay, we have it. Check if also have cpu_set_t. If we don't,
167 # then we have the first version using unsigned long, and no
168 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
169 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
170 # should also be present, but we confirm nonetheless.
174 [ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
175 AC_MSG_CHECKING([whether CPU_ZERO works])
176 AH_TEMPLATE([HAVE_CPU_ZERO],
177 [Define to 1 if we have CPU_ZERO and if it works])
182 [cpu_set_t foo; CPU_ZERO (&foo);])
185 AC_DEFINE(HAVE_CPU_ZERO, 1)
188 [AC_MSG_RESULT([no])]
191 # Check how many arguments does sched_setaffinity take.
193 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
196 [#include <sched.h>],
197 [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
199 [sched_set_affinity_args=3],
200 [sched_set_affinity_args=2])
201 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
202 [Define to sched_setaffinity's number of arguments.])
203 AC_MSG_RESULT([$sched_set_affinity_args])
205 [ # No cpu_set_t, always 3 args.
206 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
216 urcu/uatomic_arch.h:$UATOMICSRC