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/** BEGIN COPYRIGHT BLOCK
* This Program 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; version 2 of the License.
*
* This Program 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.
*
* In addition, as a special exception, Red Hat, Inc. gives You the additional
* right to link the code of this Program with code not covered under the GNU
* General Public License ("Non-GPL Code") and to distribute linked combinations
* including the two, subject to the limitations in this paragraph. Non-GPL Code
* permitted under this exception must only link to the code of this Program
* through those well defined interfaces identified in the file named EXCEPTION
* found in the source code files (the "Approved Interfaces"). The files of
* Non-GPL Code may instantiate templates or use macros or inline functions from
* the Approved Interfaces without causing the resulting work to be covered by
* the GNU General Public License. Only Red Hat, Inc. may make changes or
* additions to the list of Approved Interfaces. You must obey the GNU General
* Public License in all respects for all of the Program code and other code used
* in conjunction with the Program except the Non-GPL Code covered by this
* exception. If you modify this file, you may extend this exception to your
* version of the file, but you are not obligated to do so. If you do not wish to
* provide this exception without modification, you must delete this exception
* statement from your version and license this file solely under the GPL without
* exception.
*
*
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/*
* fsmutex: Mutexes that are filesystem-based so they're available from more
* than one process and address space
*
* Rob McCool
*/
#include "base/fsmutex.h"
#ifdef THREAD_ANY
#include "base/crit.h"
#include "base/systhr.h"
#endif
#include "base/util.h"
#ifdef XP_WIN32
typedef HANDLE sys_fsmutex_t;
#endif
#ifdef XP_UNIX
#include "base/file.h"
typedef SYS_FILE sys_fsmutex_t;
#endif
typedef struct {
sys_fsmutex_t mutex;
char *id;
#ifdef THREAD_ANY
CRITICAL crit;
#endif
int flags;
} fsmutex_s;
/* ----------------------------- fsmutex_init ----------------------------- */
#ifdef XP_UNIX
static int
_fsmutex_create(fsmutex_s *fsm, char *name, int number)
{
char tn[256];
SYS_FILE lfd;
int visible = (fsm->flags & FSMUTEX_VISIBLE ? 1 : 0);
util_snprintf(tn, 256, "/tmp/%s.%d", name, number);
if(!visible)
unlink(tn);
if( (lfd = PR_Open(tn, PR_RDWR|PR_CREATE_FILE, 0644)) == NULL)
return -1;
if(!visible)
unlink(tn);
else
fsm->id = PERM_STRDUP(tn);
fsm->mutex = lfd;
return 0;
}
#endif
#ifdef XP_WIN32
static int
_fsmutex_create(fsmutex_s *fsm, char *name, int number)
{
char tn[256];
util_snprintf(tn, sizeof(tn), "%s.%d", name, number);
fsm->id = NULL;
fsm->mutex = CreateMutex(NULL, FALSE,
(fsm->flags & FSMUTEX_VISIBLE ? tn : NULL));
return (fsm->mutex ? 0 : -1);
}
#endif
NSAPI_PUBLIC FSMUTEX
fsmutex_init(char *name, int number, int flags)
{
fsmutex_s *ret = (fsmutex_s *) PERM_MALLOC(sizeof(fsmutex_s));
ret->flags = flags;
if(_fsmutex_create(ret, name, number) == -1) {
PERM_FREE(ret);
return NULL;
}
#ifdef THREAD_ANY
if(flags & FSMUTEX_NEEDCRIT)
ret->crit = crit_init();
#endif
return (FSMUTEX) ret;
}
#ifdef XP_UNIX
NSAPI_PUBLIC void
fsmutex_setowner(FSMUTEX fsm, uid_t uid, gid_t gid)
{
if(!geteuid())
(void) chown( ((fsmutex_s *)fsm)->id, uid, gid);
}
#endif
/* -------------------------- fsmutex_terminate --------------------------- */
#ifdef XP_UNIX
static void
_fsmutex_delete(fsmutex_s *fsm)
{
if(fsm->flags & FSMUTEX_VISIBLE)
unlink(fsm->id);
PERM_FREE(fsm->id);
PR_Close(fsm->mutex);
}
#endif
#ifdef XP_WIN32
static void
_fsmutex_delete(fsmutex_s *fsm)
{
CloseHandle(fsm->mutex);
}
#endif
NSAPI_PUBLIC void
fsmutex_terminate(FSMUTEX id)
{
fsmutex_s *fsm = (fsmutex_s *) id;
_fsmutex_delete(fsm);
#ifdef THREAD_ANY
if(fsm->flags & FSMUTEX_NEEDCRIT)
crit_terminate(fsm->crit);
#endif
PERM_FREE(fsm);
}
/* ----------------------------- fsmutex_lock ----------------------------- */
NSAPI_PUBLIC void
fsmutex_lock(FSMUTEX id)
{
fsmutex_s *fsm = (fsmutex_s *) id;
#ifdef THREAD_ANY
if(fsm->flags & FSMUTEX_NEEDCRIT)
crit_enter(fsm->crit);
#endif
#ifdef XP_UNIX
#ifdef THREAD_NSPR_USER
/* Poll to avoid blocking. XXXrobm If errno is wrong this may go awry. */
while(system_tlock(fsm->mutex) == -1)
systhread_sleep(1000);
#else
system_flock(fsm->mutex );
#endif
#endif
#ifdef XP_WIN32
WaitForSingleObject(fsm->mutex, INFINITE);
#endif
}
/* ---------------------------- fsmutex_unlock ---------------------------- */
NSAPI_PUBLIC void
fsmutex_unlock(FSMUTEX id)
{
fsmutex_s *fsm = (fsmutex_s *) id;
#ifdef XP_UNIX
system_ulock(fsm->mutex);
#endif
#ifdef XP_WIN32
ReleaseMutex(fsm->mutex);
#endif
#ifdef THREAD_ANY
if(fsm->flags & FSMUTEX_NEEDCRIT)
crit_exit(fsm->crit);
#endif
}
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