1 /* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 static const struct pthread_mutexattr default_attr
=
27 /* Default is a normal mutex, not shared between processes. */
28 .mutexkind
= PTHREAD_MUTEX_NORMAL
33 __pthread_mutex_init (mutex
, mutexattr
)
34 pthread_mutex_t
*mutex
;
35 const pthread_mutexattr_t
*mutexattr
;
37 const struct pthread_mutexattr
*imutexattr
;
39 assert (sizeof (pthread_mutex_t
) <= __SIZEOF_PTHREAD_MUTEX_T
);
41 imutexattr
= (const struct pthread_mutexattr
*) mutexattr
?: &default_attr
;
44 // XXX For now we don't support priority protected mutexes.
45 switch (__builtin_expect (imutexattr
->mutexkind
46 & PTHREAD_MUTEXATTR_PROTOCOL_MASK
,
48 << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT
))
50 case PTHREAD_PRIO_NONE
<< PTHREAD_MUTEXATTR_PROTOCOL_SHIFT
:
53 case PTHREAD_PRIO_INHERIT
<< PTHREAD_MUTEXATTR_PROTOCOL_SHIFT
:
54 #ifndef __ASSUME_SET_ROBUST_LIST
55 if (__set_robust_list_avail
< 0)
64 /* Clear the whole variable. */
65 memset (mutex
, '\0', __SIZEOF_PTHREAD_MUTEX_T
);
67 /* Copy the values from the attribute. */
68 mutex
->__data
.__kind
= imutexattr
->mutexkind
& ~PTHREAD_MUTEXATTR_FLAG_BITS
;
70 if ((imutexattr
->mutexkind
& PTHREAD_MUTEXATTR_FLAG_ROBUST
) != 0)
72 #ifndef __ASSUME_SET_ROBUST_LIST
73 if ((imutexattr
->mutexkind
& PTHREAD_MUTEXATTR_FLAG_PSHARED
) != 0
74 && __set_robust_list_avail
< 0)
78 mutex
->__data
.__kind
|= PTHREAD_MUTEX_ROBUST_NORMAL_NP
;
81 switch (imutexattr
->mutexkind
& PTHREAD_MUTEXATTR_PROTOCOL_MASK
)
83 case PTHREAD_PRIO_INHERIT
<< PTHREAD_MUTEXATTR_PROTOCOL_SHIFT
:
84 mutex
->__data
.__kind
|= PTHREAD_MUTEX_PRIO_INHERIT_NP
;
87 case PTHREAD_PRIO_PROTECT
<< PTHREAD_MUTEXATTR_PROTOCOL_SHIFT
:
88 mutex
->__data
.__kind
|= PTHREAD_MUTEX_PRIO_PROTECT_NP
;
89 if (PTHREAD_MUTEX_PRIO_CEILING_MASK
90 == PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
)
91 mutex
->__data
.__kind
|= (imutexattr
->mutexkind
92 & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
);
94 mutex
->__data
.__kind
|= ((imutexattr
->mutexkind
95 & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
)
96 >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT
)
97 << PTHREAD_MUTEX_PRIO_CEILING_SHIFT
;
104 /* Default values: mutex not used yet. */
105 // mutex->__count = 0; already done by memset
106 // mutex->__owner = 0; already done by memset
107 // mutex->__nusers = 0; already done by memset
108 // mutex->__spins = 0; already done by memset
109 // mutex->__next = NULL; already done by memset
113 strong_alias (__pthread_mutex_init
, pthread_mutex_init
)
114 INTDEF(__pthread_mutex_init
)