1 /* Copyright (C) 2002, 2003, 2005 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
23 #include <lowlevellock.h>
27 internal_function attribute_hidden
28 __pthread_mutex_unlock_usercnt (mutex
, decr
)
29 pthread_mutex_t
*mutex
;
34 switch (__builtin_expect (mutex
->__data
.__kind
, PTHREAD_MUTEX_TIMED_NP
))
36 case PTHREAD_MUTEX_RECURSIVE_NP
:
37 /* Recursive mutex. */
38 if (mutex
->__data
.__owner
!= THREAD_GETMEM (THREAD_SELF
, tid
))
41 if (--mutex
->__data
.__count
!= 0)
42 /* We still hold the mutex. */
46 case PTHREAD_MUTEX_ERRORCHECK_NP
:
47 /* Error checking mutex. */
48 if (mutex
->__data
.__owner
!= THREAD_GETMEM (THREAD_SELF
, tid
)
49 || ! lll_mutex_islocked (mutex
->__data
.__lock
))
53 case PTHREAD_MUTEX_TIMED_NP
:
54 case PTHREAD_MUTEX_ADAPTIVE_NP
:
55 /* Normal mutex. Nothing special to do. */
58 case PTHREAD_MUTEX_ROBUST_PRIVATE_RECURSIVE_NP
:
59 /* Recursive mutex. */
60 if (mutex
->__data
.__owner
== -THREAD_GETMEM (THREAD_SELF
, tid
))
62 if (--mutex
->__data
.__count
!= 0)
63 /* We still hold the mutex. */
64 return ENOTRECOVERABLE
;
69 if (mutex
->__data
.__owner
!= THREAD_GETMEM (THREAD_SELF
, tid
))
72 if (--mutex
->__data
.__count
!= 0)
73 /* We still hold the mutex. */
78 case PTHREAD_MUTEX_ROBUST_PRIVATE_ERRORCHECK_NP
:
79 /* Error checking mutex. */
80 if (abs (mutex
->__data
.__owner
) != THREAD_GETMEM (THREAD_SELF
, tid
)
81 || ! lll_mutex_islocked (mutex
->__data
.__lock
))
86 case PTHREAD_MUTEX_ROBUST_PRIVATE_NP
:
87 case PTHREAD_MUTEX_ROBUST_PRIVATE_ADAPTIVE_NP
:
88 /* If the previous owner died and the caller did not succeed in
89 making the state consistent, mark the mutex as unrecoverable
90 and make all waiters. */
91 if (__builtin_expect (mutex
->__data
.__owner
92 == -THREAD_GETMEM (THREAD_SELF
, tid
)
93 || (mutex
->__data
.__owner
94 == PTHREAD_MUTEX_NOTRECOVERABLE
), 0))
96 newowner
= PTHREAD_MUTEX_NOTRECOVERABLE
;
99 /* Remove mutex from the list. */
100 DEQUEUE_MUTEX (mutex
);
104 /* Correct code cannot set any other type. */
108 /* Always reset the owner field. */
109 mutex
->__data
.__owner
= newowner
;
112 --mutex
->__data
.__nusers
;
115 lll_mutex_unlock (mutex
->__data
.__lock
);
122 __pthread_mutex_unlock (mutex
)
123 pthread_mutex_t
*mutex
;
125 return __pthread_mutex_unlock_usercnt (mutex
, 1);
127 strong_alias (__pthread_mutex_unlock
, pthread_mutex_unlock
)
128 strong_alias (__pthread_mutex_unlock
, __pthread_mutex_unlock_internal
)