/*
 * This header file distributed under the terms of the CDDL.
 * Portions Copyright 2008 Sun Microsystems, Inc. All Rights reserved.
 */
#ifndef _SYS_STACK_H
#define _SYS_STACK_H

#include <pthread.h>

#define STACK_BIAS	0

#ifdef __USE_GNU

static inline int
stack_getbounds(stack_t *sp)
{
	pthread_attr_t attr;
	int rc;

	rc = pthread_getattr_np(pthread_self(), &attr);
	if (rc)
		return rc;

	rc = pthread_attr_getstack(&attr, &sp->ss_sp, &sp->ss_size);
	if (rc == 0)
		sp->ss_flags = 0;

	pthread_attr_destroy(&attr);

	return rc;
}

static inline int
thr_stksegment(stack_t *sp)
{
	int rc;

	rc = stack_getbounds(sp);
	if (rc)
		return rc;

         /* thr_stksegment() is expected to set sp.ss_sp to the high stack
	  * address, but the stack_getbounds() interface is expected to
	  * set sp.ss_sp to the low address.  Adjust accordingly. */
	sp->ss_sp = (void *)(((uintptr_t)sp->ss_sp) + sp->ss_size);
	sp->ss_flags = 0;

	return rc;
}

#endif /* __USE_GNU */
#endif /* _SYS_STACK_H */