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/*
** 2007 August 14
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** 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.
**
** The implementation in this file does not provide any mutual
** exclusion and is thus suitable for use only in applications
** that use SQLite in a single thread. But this implementation
** does do a lot of error checking on mutexes to make sure they
** are called correctly and at appropriate times. Hence, this
** implementation is suitable for testing.
** debugging purposes
**
** $Id: mutex.c,v 1.16 2007/09/10 16:13:00 danielk1977 Exp $
*/
#include "sqliteInt.h"
#ifdef SQLITE_MUTEX_NOOP_DEBUG
/*
** In this implementation, mutexes do not provide any mutual exclusion.
** But the error checking is provided. This implementation is useful
** for test purposes.
*/
/*
** The mutex object
*/
struct sqlite3_mutex {
int id; /* The mutex type */
int cnt; /* Number of entries without a matching leave */
};
/*
** The sqlite3_mutex_alloc() routine allocates a new
** mutex and returns a pointer to it. If it returns NULL
** that means that a mutex could not be allocated.
*/
sqlite3_mutex *sqlite3_mutex_alloc(int id){
static sqlite3_mutex aStatic[5];
sqlite3_mutex *pNew = 0;
switch( id ){
case SQLITE_MUTEX_FAST:
case SQLITE_MUTEX_RECURSIVE: {
pNew = sqlite3_malloc(sizeof(*pNew));
if( pNew ){
pNew->id = id;
pNew->cnt = 0;
}
break;
}
default: {
assert( id-2 >= 0 );
assert( id-2 < sizeof(aStatic)/sizeof(aStatic[0]) );
pNew = &aStatic[id-2];
pNew->id = id;
break;
}
}
return pNew;
}
/*
** This routine deallocates a previously allocated mutex.
*/
void sqlite3_mutex_free(sqlite3_mutex *p){
assert( p );
assert( p->cnt==0 );
assert( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE );
sqlite3_free(p);
}
/*
** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
** to enter a mutex. If another thread is already within the mutex,
** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
** SQLITE_BUSY. The sqlite3_mutex_try() interface returns SQLITE_OK
** upon successful entry. Mutexes created using SQLITE_MUTEX_RECURSIVE can
** 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){
assert( p );
assert( p->id==SQLITE_MUTEX_RECURSIVE || sqlite3_mutex_notheld(p) );
p->cnt++;
}
int sqlite3_mutex_try(sqlite3_mutex *p){
assert( p );
assert( p->id==SQLITE_MUTEX_RECURSIVE || sqlite3_mutex_notheld(p) );
p->cnt++;
return SQLITE_OK;
}
/*
** The sqlite3_mutex_leave() routine exits a mutex that was
** previously entered by the same thread. The behavior
** is undefined if the mutex is not currently entered or
** is not currently allocated. SQLite will never do either.
*/
void sqlite3_mutex_leave(sqlite3_mutex *p){
assert( p );
assert( sqlite3_mutex_held(p) );
p->cnt--;
assert( p->id==SQLITE_MUTEX_RECURSIVE || sqlite3_mutex_notheld(p) );
}
/*
** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
** intended for use inside assert() statements.
*/
int sqlite3_mutex_held(sqlite3_mutex *p){
return p==0 || p->cnt>0;
}
int sqlite3_mutex_notheld(sqlite3_mutex *p){
return p==0 || p->cnt==0;
}
#endif /* SQLITE_MUTEX_NOOP_DEBUG */
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