1*062c5bc4SJason Schmidlapp /*
2*062c5bc4SJason Schmidlapp * pthread_cond_init.c
3*062c5bc4SJason Schmidlapp *
4*062c5bc4SJason Schmidlapp * Description:
5*062c5bc4SJason Schmidlapp * This translation unit implements condition variables and their primitives.
6*062c5bc4SJason Schmidlapp *
7*062c5bc4SJason Schmidlapp *
8*062c5bc4SJason Schmidlapp * --------------------------------------------------------------------------
9*062c5bc4SJason Schmidlapp *
10*062c5bc4SJason Schmidlapp * Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
11*062c5bc4SJason Schmidlapp * Copyright(C) 2008 Jason Schmidlapp
12*062c5bc4SJason Schmidlapp *
13*062c5bc4SJason Schmidlapp * Contact Email: jschmidlapp@users.sourceforge.net
14*062c5bc4SJason Schmidlapp *
15*062c5bc4SJason Schmidlapp *
16*062c5bc4SJason Schmidlapp * Based upon Pthreads-win32 - POSIX Threads Library for Win32
17*062c5bc4SJason Schmidlapp * Copyright(C) 1998 John E. Bossom
18*062c5bc4SJason Schmidlapp * Copyright(C) 1999,2005 Pthreads-win32 contributors
19*062c5bc4SJason Schmidlapp *
20*062c5bc4SJason Schmidlapp * Contact Email: rpj@callisto.canberra.edu.au
21*062c5bc4SJason Schmidlapp *
22*062c5bc4SJason Schmidlapp * The original list of contributors to the Pthreads-win32 project
23*062c5bc4SJason Schmidlapp * is contained in the file CONTRIBUTORS.ptw32 included with the
24*062c5bc4SJason Schmidlapp * source code distribution. The list can also be seen at the
25*062c5bc4SJason Schmidlapp * following World Wide Web location:
26*062c5bc4SJason Schmidlapp * http://sources.redhat.com/pthreads-win32/contributors.html
27*062c5bc4SJason Schmidlapp *
28*062c5bc4SJason Schmidlapp * This library is free software; you can redistribute it and/or
29*062c5bc4SJason Schmidlapp * modify it under the terms of the GNU Lesser General Public
30*062c5bc4SJason Schmidlapp * License as published by the Free Software Foundation; either
31*062c5bc4SJason Schmidlapp * version 2 of the License, or (at your option) any later version.
32*062c5bc4SJason Schmidlapp *
33*062c5bc4SJason Schmidlapp * This library is distributed in the hope that it will be useful,
34*062c5bc4SJason Schmidlapp * but WITHOUT ANY WARRANTY; without even the implied warranty of
35*062c5bc4SJason Schmidlapp * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
36*062c5bc4SJason Schmidlapp * Lesser General Public License for more details.
37*062c5bc4SJason Schmidlapp *
38*062c5bc4SJason Schmidlapp * You should have received a copy of the GNU Lesser General Public
39*062c5bc4SJason Schmidlapp * License along with this library in the file COPYING.LIB;
40*062c5bc4SJason Schmidlapp * if not, write to the Free Software Foundation, Inc.,
41*062c5bc4SJason Schmidlapp * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
42*062c5bc4SJason Schmidlapp */
43*062c5bc4SJason Schmidlapp
44*062c5bc4SJason Schmidlapp #include <stdlib.h>
45*062c5bc4SJason Schmidlapp
46*062c5bc4SJason Schmidlapp #include "pthread.h"
47*062c5bc4SJason Schmidlapp #include "implement.h"
48*062c5bc4SJason Schmidlapp
49*062c5bc4SJason Schmidlapp
50*062c5bc4SJason Schmidlapp int
pthread_cond_init(pthread_cond_t * cond,const pthread_condattr_t * attr)51*062c5bc4SJason Schmidlapp pthread_cond_init (pthread_cond_t * cond, const pthread_condattr_t * attr)
52*062c5bc4SJason Schmidlapp /*
53*062c5bc4SJason Schmidlapp * ------------------------------------------------------
54*062c5bc4SJason Schmidlapp * DOCPUBLIC
55*062c5bc4SJason Schmidlapp * This function initializes a condition variable.
56*062c5bc4SJason Schmidlapp *
57*062c5bc4SJason Schmidlapp * PARAMETERS
58*062c5bc4SJason Schmidlapp * cond
59*062c5bc4SJason Schmidlapp * pointer to an instance of pthread_cond_t
60*062c5bc4SJason Schmidlapp *
61*062c5bc4SJason Schmidlapp * attr
62*062c5bc4SJason Schmidlapp * specifies optional creation attributes.
63*062c5bc4SJason Schmidlapp *
64*062c5bc4SJason Schmidlapp *
65*062c5bc4SJason Schmidlapp * DESCRIPTION
66*062c5bc4SJason Schmidlapp * This function initializes a condition variable.
67*062c5bc4SJason Schmidlapp *
68*062c5bc4SJason Schmidlapp * RESULTS
69*062c5bc4SJason Schmidlapp * 0 successfully created condition variable,
70*062c5bc4SJason Schmidlapp * EINVAL 'attr' is invalid,
71*062c5bc4SJason Schmidlapp * EAGAIN insufficient resources (other than
72*062c5bc4SJason Schmidlapp * memory,
73*062c5bc4SJason Schmidlapp * ENOMEM insufficient memory,
74*062c5bc4SJason Schmidlapp * EBUSY 'cond' is already initialized,
75*062c5bc4SJason Schmidlapp *
76*062c5bc4SJason Schmidlapp * ------------------------------------------------------
77*062c5bc4SJason Schmidlapp */
78*062c5bc4SJason Schmidlapp {
79*062c5bc4SJason Schmidlapp int result;
80*062c5bc4SJason Schmidlapp pthread_cond_t cv = NULL;
81*062c5bc4SJason Schmidlapp
82*062c5bc4SJason Schmidlapp if (cond == NULL)
83*062c5bc4SJason Schmidlapp {
84*062c5bc4SJason Schmidlapp return EINVAL;
85*062c5bc4SJason Schmidlapp }
86*062c5bc4SJason Schmidlapp
87*062c5bc4SJason Schmidlapp if ((attr != NULL && *attr != NULL) &&
88*062c5bc4SJason Schmidlapp ((*attr)->pshared == PTHREAD_PROCESS_SHARED))
89*062c5bc4SJason Schmidlapp {
90*062c5bc4SJason Schmidlapp /*
91*062c5bc4SJason Schmidlapp * Creating condition variable that can be shared between
92*062c5bc4SJason Schmidlapp * processes.
93*062c5bc4SJason Schmidlapp */
94*062c5bc4SJason Schmidlapp result = ENOSYS;
95*062c5bc4SJason Schmidlapp goto DONE;
96*062c5bc4SJason Schmidlapp }
97*062c5bc4SJason Schmidlapp
98*062c5bc4SJason Schmidlapp cv = (pthread_cond_t) calloc (1, sizeof (*cv));
99*062c5bc4SJason Schmidlapp
100*062c5bc4SJason Schmidlapp if (cv == NULL)
101*062c5bc4SJason Schmidlapp {
102*062c5bc4SJason Schmidlapp result = ENOMEM;
103*062c5bc4SJason Schmidlapp goto DONE;
104*062c5bc4SJason Schmidlapp }
105*062c5bc4SJason Schmidlapp
106*062c5bc4SJason Schmidlapp cv->nWaitersBlocked = 0;
107*062c5bc4SJason Schmidlapp cv->nWaitersToUnblock = 0;
108*062c5bc4SJason Schmidlapp cv->nWaitersGone = 0;
109*062c5bc4SJason Schmidlapp
110*062c5bc4SJason Schmidlapp if (sem_init (&(cv->semBlockLock), 0, 1) != 0)
111*062c5bc4SJason Schmidlapp {
112*062c5bc4SJason Schmidlapp result = errno;
113*062c5bc4SJason Schmidlapp goto FAIL0;
114*062c5bc4SJason Schmidlapp }
115*062c5bc4SJason Schmidlapp
116*062c5bc4SJason Schmidlapp if (sem_init (&(cv->semBlockQueue), 0, 0) != 0)
117*062c5bc4SJason Schmidlapp {
118*062c5bc4SJason Schmidlapp result = errno;
119*062c5bc4SJason Schmidlapp goto FAIL1;
120*062c5bc4SJason Schmidlapp }
121*062c5bc4SJason Schmidlapp
122*062c5bc4SJason Schmidlapp if ((result = pthread_mutex_init (&(cv->mtxUnblockLock), 0)) != 0)
123*062c5bc4SJason Schmidlapp {
124*062c5bc4SJason Schmidlapp goto FAIL2;
125*062c5bc4SJason Schmidlapp }
126*062c5bc4SJason Schmidlapp
127*062c5bc4SJason Schmidlapp result = 0;
128*062c5bc4SJason Schmidlapp
129*062c5bc4SJason Schmidlapp goto DONE;
130*062c5bc4SJason Schmidlapp
131*062c5bc4SJason Schmidlapp /*
132*062c5bc4SJason Schmidlapp * -------------
133*062c5bc4SJason Schmidlapp * Failed...
134*062c5bc4SJason Schmidlapp * -------------
135*062c5bc4SJason Schmidlapp */
136*062c5bc4SJason Schmidlapp FAIL2:
137*062c5bc4SJason Schmidlapp (void) sem_destroy (&(cv->semBlockQueue));
138*062c5bc4SJason Schmidlapp
139*062c5bc4SJason Schmidlapp FAIL1:
140*062c5bc4SJason Schmidlapp (void) sem_destroy (&(cv->semBlockLock));
141*062c5bc4SJason Schmidlapp
142*062c5bc4SJason Schmidlapp FAIL0:
143*062c5bc4SJason Schmidlapp (void) free (cv);
144*062c5bc4SJason Schmidlapp cv = NULL;
145*062c5bc4SJason Schmidlapp
146*062c5bc4SJason Schmidlapp DONE:
147*062c5bc4SJason Schmidlapp if (0 == result)
148*062c5bc4SJason Schmidlapp {
149*062c5bc4SJason Schmidlapp
150*062c5bc4SJason Schmidlapp pte_osMutexLock (pte_cond_list_lock);
151*062c5bc4SJason Schmidlapp
152*062c5bc4SJason Schmidlapp cv->next = NULL;
153*062c5bc4SJason Schmidlapp cv->prev = pte_cond_list_tail;
154*062c5bc4SJason Schmidlapp
155*062c5bc4SJason Schmidlapp if (pte_cond_list_tail != NULL)
156*062c5bc4SJason Schmidlapp {
157*062c5bc4SJason Schmidlapp pte_cond_list_tail->next = cv;
158*062c5bc4SJason Schmidlapp }
159*062c5bc4SJason Schmidlapp
160*062c5bc4SJason Schmidlapp pte_cond_list_tail = cv;
161*062c5bc4SJason Schmidlapp
162*062c5bc4SJason Schmidlapp if (pte_cond_list_head == NULL)
163*062c5bc4SJason Schmidlapp {
164*062c5bc4SJason Schmidlapp pte_cond_list_head = cv;
165*062c5bc4SJason Schmidlapp }
166*062c5bc4SJason Schmidlapp
167*062c5bc4SJason Schmidlapp pte_osMutexUnlock(pte_cond_list_lock);
168*062c5bc4SJason Schmidlapp }
169*062c5bc4SJason Schmidlapp
170*062c5bc4SJason Schmidlapp *cond = cv;
171*062c5bc4SJason Schmidlapp
172*062c5bc4SJason Schmidlapp return result;
173*062c5bc4SJason Schmidlapp
174*062c5bc4SJason Schmidlapp } /* pthread_cond_init */
175