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dnl #
dnl # Check if the glibc NPTL threading implementation includes the guard area
dnl # within the stack size allocation, rather than allocating extra space at
dnl # the end of the stack, as POSIX.1 requires.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_STACK_GUARD], [
AC_MSG_CHECKING([whether pthread stack includes guard])
saved_CFLAGS="$CFLAGS"
CFLAGS="-fstack-check"
saved_LDFLAGS="$LDFLAGS"
LDFLAGS="-lpthread"
AC_RUN_IFELSE(AC_LANG_PROGRAM(
[
#include <pthread.h>
#include <sys/resource.h>
#include <unistd.h>
#include <bits/local_lim.h>
#define PAGESIZE (sysconf(_SC_PAGESIZE))
#define STACK_SIZE 8192
#define BUFSIZE 4096
void * func(void *arg)
{
char buf[[[BUFSIZE]]];
}
],
[
pthread_t tid;
pthread_attr_t attr;
struct rlimit l;
l.rlim_cur = 0;
l.rlim_max = 0;
setrlimit(RLIMIT_CORE, &l);
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + STACK_SIZE);
pthread_attr_setguardsize(&attr, PAGESIZE);
pthread_create(&tid, &attr, func, NULL);
pthread_join(tid, NULL);
]),
[
AC_MSG_RESULT([no])
],
[
AC_DEFINE([NPTL_GUARD_WITHIN_STACK], 1,
[Define to 1 if NPTL threading implementation includes
guard area in stack allocation])
AC_MSG_RESULT([yes])
])
CFLAGS="$saved_CFLAGS"
LDFLAGS="$saved_LDFLAGS"
])
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