usr/src/lib/libc/port/sys/lwp_rwlock.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 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include "lint.h"
  30 #include <synch.h>
  31 #include <time.h>
  32 #include <errno.h>
  33 #include <sys/syscall.h>
  34
  35 #define SUBSYS_lwp_rwlock_rdlock        0
  36 #define SUBSYS_lwp_rwlock_wrlock        1
  37 #define SUBSYS_lwp_rwlock_tryrdlock     2
  38 #define SUBSYS_lwp_rwlock_trywrlock     3
  39 #define SUBSYS_lwp_rwlock_unlock        4
  40
  41 int
  42 __lwp_rwlock_rdlock(rwlock_t *rwl, timespec_t *tsp)
  43 {
  44         sysret_t rval;
  45         int error;
  46
  47         error = __systemcall(&rval, SYS_lwp_rwlock_sys,
  48             SUBSYS_lwp_rwlock_rdlock, rwl, tsp);
  49         if (error == ERESTART)
  50                 error = EINTR;
  51
  52         return (error);
  53 }
  54
  55 int
  56 __lwp_rwlock_wrlock(rwlock_t *rwl, timespec_t *tsp)
  57 {
  58         sysret_t rval;
  59         int error;
  60
  61         error = __systemcall(&rval, SYS_lwp_rwlock_sys,
  62             SUBSYS_lwp_rwlock_wrlock, rwl, tsp);
  63         if (error == ERESTART)
  64                 error = EINTR;
  65
  66         return (error);
  67 }
  68
  69 int
  70 __lwp_rwlock_tryrdlock(rwlock_t *rwl)
  71 {
  72         sysret_t rval;
  73         int error;
  74
  75         error = __systemcall(&rval, SYS_lwp_rwlock_sys,
  76             SUBSYS_lwp_rwlock_tryrdlock, rwl);
  77         if (error == ERESTART)
  78                 error = EINTR;
  79
  80         return (error);
  81 }
  82
  83 int
  84 __lwp_rwlock_trywrlock(rwlock_t *rwl)
  85 {
  86         sysret_t rval;
  87         int error;
  88
  89         error = __systemcall(&rval, SYS_lwp_rwlock_sys,
  90             SUBSYS_lwp_rwlock_trywrlock, rwl);
  91         if (error == ERESTART)
  92                 error = EINTR;
  93
  94         return (error);
  95 }
  96
  97 int
  98 __lwp_rwlock_unlock(rwlock_t *rwl)
  99 {
 100         sysret_t rval;
 101         int error;
 102
 103         error = __systemcall(&rval, SYS_lwp_rwlock_sys,
 104             SUBSYS_lwp_rwlock_unlock, rwl);
 105         if (error == ERESTART)
 106                 error = EINTR;
 107
 108         return (error);
 109 }