+# 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, mask; 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)
+ ])
+])
+
+DEFAULT_INCLUDES="-include config.h"
+AC_SUBST(DEFAULT_INCLUDES)
+
+AC_CONFIG_LINKS([
+ include/urcu/arch.h:$ARCHSRC
+ include/urcu/uatomic.h:$UATOMICSRC
+])