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	twoaday	2	/* 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			}