1/*
2 * pthread_mutex_init.c
3 *
4 * Description:
5 * This translation unit implements mutual exclusion (mutex) primitives.
6 *
7 * --------------------------------------------------------------------------
8 *
9 *      Pthreads-win32 - POSIX Threads Library for Win32
10 *      Copyright(C) 1998 John E. Bossom
11 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
12 *
13 *      Contact Email: rpj@callisto.canberra.edu.au
14 *
15 *      The current list of contributors is contained
16 *      in the file CONTRIBUTORS included with the source
17 *      code distribution. The list can also be seen at the
18 *      following World Wide Web location:
19 *      http://sources.redhat.com/pthreads-win32/contributors.html
20 *
21 *      This library is free software; you can redistribute it and/or
22 *      modify it under the terms of the GNU Lesser General Public
23 *      License as published by the Free Software Foundation; either
24 *      version 2 of the License, or (at your option) any later version.
25 *
26 *      This library is distributed in the hope that it will be useful,
27 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
28 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
29 *      Lesser General Public License for more details.
30 *
31 *      You should have received a copy of the GNU Lesser General Public
32 *      License along with this library in the file COPYING.LIB;
33 *      if not, write to the Free Software Foundation, Inc.,
34 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
35 */
36
37#include "pthread.h"
38#include "implement.h"
39
40
41int
42pthread_mutex_init (pthread_mutex_t * mutex, const pthread_mutexattr_t * attr)
43{
44  int result = 0;
45  pthread_mutex_t mx;
46
47  if (mutex == NULL)
48    {
49      return EINVAL;
50    }
51
52  if (attr != NULL && *attr != NULL)
53    {
54      if ((*attr)->pshared == PTHREAD_PROCESS_SHARED)
55        {
56          /*
57           * Creating mutex that can be shared between
58           * processes.
59           */
60#if _POSIX_THREAD_PROCESS_SHARED >= 0
61
62          /*
63           * Not implemented yet.
64           */
65
66#error ERROR [__FILE__, line __LINE__]: Process shared mutexes are not supported yet.
67
68#else
69
70          return ENOSYS;
71
72#endif /* _POSIX_THREAD_PROCESS_SHARED */
73        }
74    }
75
76  mx = (pthread_mutex_t) calloc (1, sizeof (*mx));
77
78  if (mx == NULL)
79    {
80      result = ENOMEM;
81    }
82  else
83    {
84      mx->lock_idx = 0;
85      mx->recursive_count = 0;
86      mx->robustNode = NULL;
87      if (attr == NULL || *attr == NULL)
88        {
89          mx->kind = PTHREAD_MUTEX_DEFAULT;
90        }
91      else
92        {
93          mx->kind = (*attr)->kind;
94          if ((*attr)->robustness == PTHREAD_MUTEX_ROBUST)
95            {
96              /*
97               * Use the negative range to represent robust types.
98               * Replaces a memory fetch with a register negate and incr
99               * in pthread_mutex_lock etc.
100               *
101               * Map 0,1,..,n to -1,-2,..,(-n)-1
102               */
103              mx->kind = -mx->kind - 1;
104
105              mx->robustNode = (ptw32_robust_node_t*) malloc(sizeof(ptw32_robust_node_t));
106              mx->robustNode->stateInconsistent = PTW32_ROBUST_CONSISTENT;
107              mx->robustNode->mx = mx;
108              mx->robustNode->next = NULL;
109              mx->robustNode->prev = NULL;
110            }
111        }
112
113      mx->ownerThread.p = NULL;
114
115      mx->event = CreateEvent (NULL, PTW32_FALSE,    /* manual reset = No */
116                              PTW32_FALSE,           /* initial state = not signaled */
117                              NULL);                 /* event name */
118
119      if (0 == mx->event)
120        {
121          result = ENOSPC;
122          free (mx);
123          mx = NULL;
124        }
125    }
126
127  *mutex = mx;
128
129  return (result);
130}
131