[ffc10b]: pthread_mutexattr_settype.c Maximize Restore History

Download this file

pthread_mutexattr_settype.c    144 lines (138 with data), 5.5 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*
* pthread_mutexattr_settype.c
*
* Description:
* This translation unit implements mutual exclusion (mutex) primitives.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
int
pthread_mutexattr_settype (pthread_mutexattr_t * attr, int kind)
/*
* ------------------------------------------------------
*
* DOCPUBLIC
* The pthread_mutexattr_settype() and
* pthread_mutexattr_gettype() functions respectively set and
* get the mutex type attribute. This attribute is set in the
* type parameter to these functions.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_mutexattr_t
*
* type
* must be one of:
*
* PTHREAD_MUTEX_DEFAULT
*
* PTHREAD_MUTEX_NORMAL
*
* PTHREAD_MUTEX_ERRORCHECK
*
* PTHREAD_MUTEX_RECURSIVE
*
* DESCRIPTION
* The pthread_mutexattr_settype() and
* pthread_mutexattr_gettype() functions respectively set and
* get the mutex type attribute. This attribute is set in the
* type parameter to these functions. The default value of the
* type attribute is PTHREAD_MUTEX_DEFAULT.
*
* The type of mutex is contained in the type attribute of the
* mutex attributes. Valid mutex types include:
*
* PTHREAD_MUTEX_NORMAL
* This type of mutex does not detect deadlock. A
* thread attempting to relock this mutex without
* first unlocking it will deadlock. Attempting to
* unlock a mutex locked by a different thread
* results in undefined behavior. Attempting to
* unlock an unlocked mutex results in undefined
* behavior.
*
* PTHREAD_MUTEX_ERRORCHECK
* This type of mutex provides error checking. A
* thread attempting to relock this mutex without
* first unlocking it will return with an error. A
* thread attempting to unlock a mutex which another
* thread has locked will return with an error. A
* thread attempting to unlock an unlocked mutex will
* return with an error.
*
* PTHREAD_MUTEX_DEFAULT
* Same as PTHREAD_MUTEX_NORMAL.
*
* PTHREAD_MUTEX_RECURSIVE
* A thread attempting to relock this mutex without
* first unlocking it will succeed in locking the
* mutex. The relocking deadlock which can occur with
* mutexes of type PTHREAD_MUTEX_NORMAL cannot occur
* with this type of mutex. Multiple locks of this
* mutex require the same number of unlocks to
* release the mutex before another thread can
* acquire the mutex. A thread attempting to unlock a
* mutex which another thread has locked will return
* with an error. A thread attempting to unlock an
* unlocked mutex will return with an error. This
* type of mutex is only supported for mutexes whose
* process shared attribute is
* PTHREAD_PROCESS_PRIVATE.
*
* RESULTS
* 0 successfully set attribute,
* EINVAL 'attr' or 'type' is invalid,
*
* ------------------------------------------------------
*/
{
int result = 0;
if ((attr != NULL && *attr != NULL))
{
switch (kind)
{
case PTHREAD_MUTEX_FAST_NP:
case PTHREAD_MUTEX_RECURSIVE_NP:
case PTHREAD_MUTEX_ERRORCHECK_NP:
(*attr)->kind = kind;
break;
default:
result = EINVAL;
break;
}
}
else
{
result = EINVAL;
}
return (result);
} /* pthread_mutexattr_settype */