usr/src/lib/libc/port/threads/tmem.c

   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 /*
  23  * Copyright (c) 2012, Joyent, Inc.  All rights reserved.
  24  */
  25
  26 #include "lint.h"
  27 #include "thr_uberdata.h"
  28
  29 /*
  30  * This file implements the private interface with libumem for per-thread
  31  * caching umem (ptcumem). For the full details on how tcumem works and how
  32  * these functions work, see section 8.4 of the big theory statement in
  33  * lib/libumem/common/umem.c.
  34  */
  35 static tmem_func_t tmem_cleanup = NULL;
  36
  37 uintptr_t
  38 _tmem_get_base(void)
  39 {
  40         return ((uintptr_t)&curthread->ul_tmem - (uintptr_t)curthread);
  41 }
  42
  43 int
  44 _tmem_get_nentries(void)
  45 {
  46         return (NTMEMBASE);
  47 }
  48
  49 void
  50 _tmem_set_cleanup(tmem_func_t f)
  51 {
  52         tmem_cleanup = f;
  53 }
  54
  55 /*
  56  * This is called by _thrp_exit() to clean up any per-thread allocations that
  57  * are still hanging around and haven't been cleaned up.
  58  */
  59 void
  60 tmem_exit(void)
  61 {
  62         int ii;
  63         void *buf, *next;
  64         tumem_t *tp = &curthread->ul_tmem;
  65
  66
  67         if (tp->tm_size == 0)
  68                 return;
  69
  70         /*
  71          * Since we have something stored here, we need to ensure we declared a
  72          * clean up handler. If we haven't that's broken and our single private
  73          * consumer should be shot.
  74          */
  75         if (tmem_cleanup == NULL)
  76                 abort();
  77         for (ii = 0; ii < NTMEMBASE; ii++) {
  78                 buf = tp->tm_roots[ii];
  79                 while (buf != NULL) {
  80                         next = *(void **)buf;
  81                         tmem_cleanup(buf, ii);
  82                         buf = next;
  83                 }
  84         }
  85 }