**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the C functions that implement mutexes for
** use by the SQLite core.
**
** $Id: mutex.c,v 1.9 2007/08/24 20:46:59 drh Exp $
*/
/*
** If SQLITE_MUTEX_APPDEF is defined, then this whole module is
** omitted and equivalent functionality must be provided by the
** application that links against the SQLite library.
*/
#ifndef SQLITE_MUTEX_APPDEF
................................................................................
** be entered multiple times by the same thread.  In such cases the,
** mutex must be exited an equal number of times before another thread
** can enter.  If the same thread tries to enter any other kind of mutex
** more than once, the behavior is undefined.
*/
void sqlite3_mutex_enter(sqlite3_mutex *p){
  pthread_t self = pthread_self();
  if( pthread_equal(p->owner, self) && p->nRef>0 ){
    p->nRef++;
  }else{
    pthread_mutex_lock(&p->mutex);
    assert( p->nRef==0 );
    p->owner = self;
    p->nRef = 1;
  }
}
int sqlite3_mutex_try(sqlite3_mutex *p){
  pthread_t self = pthread_self();
  int rc;
  if( pthread_equal(p->owner, self) && p->nRef>0 ){
    p->nRef++;
    rc = SQLITE_OK;
  }else if( pthread_mutex_lock(&p->mutex)==0 ){
    assert( p->nRef==0 );
    p->owner = self;
    p->nRef = 1;
    rc = SQLITE_OK;

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the C functions that implement mutexes for
** use by the SQLite core.
**
** $Id: mutex.c,v 1.10 2007/08/25 03:59:09 drh Exp $
*/
/*
** If SQLITE_MUTEX_APPDEF is defined, then this whole module is
** omitted and equivalent functionality must be provided by the
** application that links against the SQLite library.
*/
#ifndef SQLITE_MUTEX_APPDEF
................................................................................
** be entered multiple times by the same thread.  In such cases the,
** mutex must be exited an equal number of times before another thread
** can enter.  If the same thread tries to enter any other kind of mutex
** more than once, the behavior is undefined.
*/
void sqlite3_mutex_enter(sqlite3_mutex *p){
  pthread_t self = pthread_self();
  if( p->nRef>0 && pthread_equal(p->owner, self) ){
    p->nRef++;
  }else{
    pthread_mutex_lock(&p->mutex);
    assert( p->nRef==0 );
    p->owner = self;
    p->nRef = 1;
  }
}
int sqlite3_mutex_try(sqlite3_mutex *p){
  pthread_t self = pthread_self();
  int rc;
  if( p->nRef>0 && pthread_equal(p->owner, self) ){
    p->nRef++;
    rc = SQLITE_OK;
  }else if( pthread_mutex_lock(&p->mutex)==0 ){
    assert( p->nRef==0 );
    p->owner = self;
    p->nRef = 1;
    rc = SQLITE_OK;