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Optimizations to the OS sub-type checking in the Win32 VFS.

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FossilOrigin-Name: 1e5489faff093d6a8e538061e45532f9050e9459
This commit is contained in:
mistachkin
2014-07-31 18:54:01 +00:00
parent f6296cafc5
commit 202cb64189
5 changed files with 33 additions and 21 deletions
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10
src/mutex_w32.c
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@@ -93,12 +93,13 @@ static sqlite3_mutex winMutex_staticMutexes[] = {
};
static int winMutex_isInit = 0;
static int winMutex_isNt = -1; /* <0 means "need to query" */
/* As the winMutexInit() and winMutexEnd() functions are called as part
** of the sqlite3_initialize() and sqlite3_shutdown() processing, the
** "interlocked" magic used here is probably not strictly necessary.
*/
static LONG winMutex_lock = 0;
static LONG volatile winMutex_lock = 0;
int sqlite3_win32_is_nt(void); /* os_win.c */
void sqlite3_win32_sleep(DWORD milliseconds); /* os_win.c */
@@ -295,7 +296,12 @@ static int winMutexTry(sqlite3_mutex *p){
*/
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0400
assert( winMutex_isInit==1 );
if( sqlite3_win32_is_nt() && TryEnterCriticalSection(&p->mutex) ){
assert( winMutex_isNt>=-1 && winMutex_isNt<=1 );
if( winMutex_isNt<0 ){
winMutex_isNt = sqlite3_win32_is_nt();
}
assert( winMutex_isNt==0 || winMutex_isNt==1 );
if( winMutex_isNt && TryEnterCriticalSection(&p->mutex) ){
#ifdef SQLITE_DEBUG
p->owner = tid;
p->nRef++;