Remove glibc < 2.4 compat code for sched_setaffinity

[urcu.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index cb560aa88dc0e2eed6d8d5b827d665316d106f20..e6b9211c87a76ecf44884768b8c446a7f2cbf768 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -149,6 +149,7 @@ AC_CHECK_FUNCS([ \
        munmap \
        rand_r \
        sched_getcpu \
+       sched_setaffinity \
        strerror \
        strtoul \
        sysconf \
@@ -220,109 +221,6 @@ AE_IF_FEATURE_ENABLED([cds-lfht-iter-debug], [
 ])
 
 
-# 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);
-# ~~~~
-
-AC_CHECK_TYPES([cpu_set_t],
-       [have_cpu_set_t="yes"],
-       [have_cpu_set_t="no"],
-       [#include <sched.h>])
-
-# 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([[
-               #include <sched.h>
-               int main()
-               {
-                       cpu_set_t foo; CPU_ZERO(&foo);
-                       return 0;
-               }
-       ]])
-],[
-       AC_DEFINE(HAVE_CPU_ZERO, 1)
-       AC_MSG_RESULT([yes])
-],[
-       AC_MSG_RESULT([no])
-])
-
-# Confirm that we have CPU_SET, and it actually works.
-AC_MSG_CHECKING([whether CPU_SET works])
-AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-               #include <sched.h>
-               int main()
-               {
-                       cpu_set_t foo; CPU_SET(0, &foo);
-                       return 0;
-               }
-       ]])
-],[
-       AC_DEFINE(HAVE_CPU_SET, 1)
-       AC_MSG_RESULT([yes])
-],[
-       AC_MSG_RESULT([no])
-])
-
-# 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.
-
-       AS_IF([test "x$have_cpu_set_t" = "xyes"], [
-               # We do have it.
-               # 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)
-       ])
-])
-
-
 ##                                                                          ##
 ## Set automake variables for optional feature conditionnals in Makefile.am ##
 ##                                                                          ##
@@ -346,6 +244,11 @@ AC_SUBST(AM_CPPFLAGS)
 AM_CFLAGS="-Wall -Wextra -Wno-unused-parameter $PTHREAD_CFLAGS"
 AC_SUBST(AM_CFLAGS)
 
+
+##                                     ##
+## Output files generated by configure ##
+##                                     ##
+
 AC_CONFIG_FILES([
        Makefile
        doc/Makefile