[mirror_zfs-debian.git] / config / user-nptl_guard_within_stack.m4

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"
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # Check if the glibc NPTL threading implementation includes the guard area
	3	dnl # within the stack size allocation, rather than allocating extra space at
	4	dnl # the end of the stack, as POSIX.1 requires.
	5	dnl #
	6	AC_DEFUN([ZFS_AC_CONFIG_USER_STACK_GUARD], [
	7
	8	AC_MSG_CHECKING([whether pthread stack includes guard])
	9
	10	saved_CFLAGS="$CFLAGS"
	11	CFLAGS="-fstack-check"
	12	saved_LDFLAGS="$LDFLAGS"
	13	LDFLAGS="-lpthread"
	14
e89236fd	15	AC_RUN_IFELSE([AC_LANG_PROGRAM(
c9c0d073 BB	16	[
	17	#include <pthread.h>
	18	#include <sys/resource.h>
	19	#include <unistd.h>
	20	#include <bits/local_lim.h>
	21
	22	#define PAGESIZE (sysconf(_SC_PAGESIZE))
	23	#define STACK_SIZE 8192
	24	#define BUFSIZE 4096
	25
	26	void * func(void *arg)
	27	{
e89236fd	28	char buf[[BUFSIZE]];
c9c0d073 BB	29	}
	30	],
	31	[
	32	pthread_t tid;
	33	pthread_attr_t attr;
	34	struct rlimit l;
	35
	36	l.rlim_cur = 0;
	37	l.rlim_max = 0;
	38	setrlimit(RLIMIT_CORE, &l);
	39	pthread_attr_init(&attr);
	40	pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + STACK_SIZE);
	41	pthread_attr_setguardsize(&attr, PAGESIZE);
	42	pthread_create(&tid, &attr, func, NULL);
	43	pthread_join(tid, NULL);
e89236fd	44	])],
c9c0d073 BB	45	[
	46	AC_MSG_RESULT([no])
	47	],
	48	[
	49	AC_DEFINE([NPTL_GUARD_WITHIN_STACK], 1,
	50	[Define to 1 if NPTL threading implementation includes
	51	guard area in stack allocation])
	52	AC_MSG_RESULT([yes])
	53	])
	54	CFLAGS="$saved_CFLAGS"
	55	LDFLAGS="$saved_LDFLAGS"
	56	])