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/** BEGIN COPYRIGHT BLOCK
* Copyright 2001 Sun Microsystems, Inc.
* Portions copyright 1999, 2001-2003 Netscape Communications Corporation.
* All rights reserved.
* END COPYRIGHT BLOCK **/
/*
* 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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