lib/libspl/include/sys/stack.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * This header file distributed under the terms of the CDDL.
  23  * Portions Copyright 2008 Sun Microsystems, Inc. All Rights reserved.
  24  */
  25 #ifndef _SYS_STACK_H
  26 #define _SYS_STACK_H
  27
  28 #include <pthread.h>
  29
  30 #define STACK_BIAS      0
  31
  32 #ifdef __USE_GNU
  33
  34 static inline int
  35 stack_getbounds(stack_t *sp)
  36 {
  37         pthread_attr_t attr;
  38         int rc;
  39
  40         rc = pthread_getattr_np(pthread_self(), &attr);
  41         if (rc)
  42                 return (rc);
  43
  44         rc = pthread_attr_getstack(&attr, &sp->ss_sp, &sp->ss_size);
  45         if (rc == 0)
  46                 sp->ss_flags = 0;
  47
  48         pthread_attr_destroy(&attr);
  49
  50         return (rc);
  51 }
  52
  53 static inline int
  54 thr_stksegment(stack_t *sp)
  55 {
  56         int rc;
  57
  58         rc = stack_getbounds(sp);
  59         if (rc)
  60                 return (rc);
  61
  62         /*
  63          * thr_stksegment() is expected to set sp.ss_sp to the high stack
  64          * address, but the stack_getbounds() interface is expected to
  65          * set sp.ss_sp to the low address.  Adjust accordingly.
  66          */
  67         sp->ss_sp = (void *)(((uintptr_t)sp->ss_sp) + sp->ss_size);
  68         sp->ss_flags = 0;
  69
  70         return (rc);
  71 }
  72
  73 #endif /* __USE_GNU */
  74 #endif /* _SYS_STACK_H */