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Add the SQLITE_CONFIG_MUTEX symbol for use with sqlite3_config(). (CVS 5228)

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FossilOrigin-Name: af1835bb5f5e3fb78d782c7c287e20db169e883f
This commit is contained in:
danielk1977
2008-06-17 18:57:49 +00:00
parent 6d2ab0e431
commit b2e36222af
5 changed files with 30 additions and 15 deletions
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15
src/mutex.c
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@@ -19,7 +19,7 @@
** implementation is suitable for testing.
** debugging purposes
**
** $Id: mutex.c,v 1.21 2008/06/17 17:21:18 danielk1977 Exp $
** $Id: mutex.c,v 1.22 2008/06/17 18:57:49 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -30,12 +30,24 @@
int sqlite3_mutex_init(void){
int rc;
if( !sqlite3Config.mutex.xMutexAlloc ){
/* If the xMutexAlloc method has not been set, then the user did not
** install a mutex implementation via sqlite3_config() prior to
** sqlite3_initialize() being called. This block copies pointers to
** the default implementation into the sqlite3Config structure.
**
** The danger is that although sqlite3_config() is not a threadsafe
** API, sqlite3_initialize() is, and so multiple threads may be
** attempting to run this function simultaneously. To guard write
** access to the sqlite3Config structure, the 'MASTER' static mutex
** is obtained before modifying it.
*/
sqlite3_mutex_methods *p = sqlite3DefaultMutex();
sqlite3_mutex *pMaster;
rc = p->xMutexInit();
if( rc==SQLITE_OK ){
pMaster = p->xMutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
assert(pMaster);
p->xMutexEnter(pMaster);
assert( sqlite3Config.mutex.xMutexAlloc==0
|| sqlite3Config.mutex.xMutexAlloc==p->xMutexAlloc
@@ -45,7 +57,6 @@ int sqlite3_mutex_init(void){
}
p->xMutexLeave(pMaster);
}
}else{
rc = sqlite3Config.mutex.xMutexInit();
}