trunk/MyGPGME/w32-sema.c

/* w32-sema.c 
 *      Copyright (C) 2001 Werner Koch (dd9jn), g10 Code GmbH
 *
 * This file is part of MyGPGME.
 *
 * MyGPGME is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MyGPGME 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <windows.h>
#include <process.h>
#include <io.h>

#include "util.h"
#include "sema.h"

static void
sema_fatal (const char *text)
{
    fprintf (stderr, "sema.c: %s\n", text);
    abort ();
}


static void
critsect_init (struct critsect_s * s)
{
    CRITICAL_SECTION * mp;
    static CRITICAL_SECTION init_lock;
    static int initialized;
    
    if (!initialized) {
        /* the very first time we call this function, we assume that only
         * one thread is running, so that we can bootstrap the semaphore code 
         */
        InitializeCriticalSection (&init_lock);
        initialized = 1;
    }
    if (!s)
        return; /* we just want to initialize ourself */

    /* first test whether it is really not initialized */
    EnterCriticalSection (&init_lock);
    if ( s->private ) {
        LeaveCriticalSection (&init_lock);
        return;
    }
    /* now init it */
    mp = malloc ( sizeof *mp );
    if (!mp) {
        LeaveCriticalSection (&init_lock);
        sema_fatal ("out of core while creating critical section lock");
    }
    InitializeCriticalSection (mp);
    s->private = mp;
    LeaveCriticalSection (&init_lock);
}

void
_gpgme_sema_subsystem_init ()
{
    /* fixme: we should check that there is only one thread running */
    critsect_init (NULL);
}


void
_gpgme_sema_cs_enter ( struct critsect_s *s )
{
    if (!s->private)
        critsect_init (s);
    EnterCriticalSection ( (CRITICAL_SECTION*)s->private );
}

void
_gpgme_sema_cs_leave (struct critsect_s *s)
{
    if (!s->private)
        critsect_init (s);
    LeaveCriticalSection ( (CRITICAL_SECTION*)s->private );
}

void
_gpgme_sema_cs_destroy ( struct critsect_s *s )
{
    if (s && s->private) {
        DeleteCriticalSection ((CRITICAL_SECTION*)s->private);
        safe_free (s->private);
        s->private = NULL;
    }
}
1	/* w32-sema.c
2	* Copyright (C) 2001 Werner Koch (dd9jn), g10 Code GmbH
3	*
4	* This file is part of MyGPGME.
5	*
6	* MyGPGME is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* MyGPGME is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
19	*/
20
21	#include <stdio.h>
22	#include <stdlib.h>
23	#include <string.h>
24	#include <assert.h>
25	#include <errno.h>
26	#include <sys/types.h>
27	#include <windows.h>
28	#include <process.h>
29	#include <io.h>
30
31	#include "util.h"
32	#include "sema.h"
33
34	static void
35	sema_fatal (const char *text)
36	{
37	fprintf (stderr, "sema.c: %s\n", text);
38	abort ();
39	}
40
41
42	static void
43	critsect_init (struct critsect_s * s)
44	{
45	CRITICAL_SECTION * mp;
46	static CRITICAL_SECTION init_lock;
47	static int initialized;
48
49	if (!initialized) {
50	/* the very first time we call this function, we assume that only
51	* one thread is running, so that we can bootstrap the semaphore code
52	*/
53	InitializeCriticalSection (&init_lock);
54	initialized = 1;
55	}
56	if (!s)
57	return; /* we just want to initialize ourself */
58
59	/* first test whether it is really not initialized */
60	EnterCriticalSection (&init_lock);
61	if ( s->private ) {
62	LeaveCriticalSection (&init_lock);
63	return;
64	}
65	/* now init it */
66	mp = malloc ( sizeof *mp );
67	if (!mp) {
68	LeaveCriticalSection (&init_lock);
69	sema_fatal ("out of core while creating critical section lock");
70	}
71	InitializeCriticalSection (mp);
72	s->private = mp;
73	LeaveCriticalSection (&init_lock);
74	}
75
76	void
77	_gpgme_sema_subsystem_init ()
78	{
79	/* fixme: we should check that there is only one thread running */
80	critsect_init (NULL);
81	}
82
83
84	void
85	_gpgme_sema_cs_enter ( struct critsect_s *s )
86	{
87	if (!s->private)
88	critsect_init (s);
89	EnterCriticalSection ( (CRITICAL_SECTION*)s->private );
90	}
91
92	void
93	_gpgme_sema_cs_leave (struct critsect_s *s)
94	{
95	if (!s->private)
96	critsect_init (s);
97	LeaveCriticalSection ( (CRITICAL_SECTION*)s->private );
98	}
99
100	void
101	_gpgme_sema_cs_destroy ( struct critsect_s *s )
102	{
103	if (s && s->private) {
104	DeleteCriticalSection ((CRITICAL_SECTION*)s->private);
105	safe_free (s->private);
106	s->private = NULL;
107	}
108	}