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Improve performance by about 10% by avoiding excess calls to get

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the thread-specific data. (CVS 2921)

FossilOrigin-Name: a8c74febec11eb689ca9f6b454f8c8bbadfc49d7
This commit is contained in:
drh
2006-01-12 01:25:18 +00:00
parent b4bc7057e5
commit 70ff98ab74
7 changed files with 54 additions and 34 deletions
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20
src/os_unix.c
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@@ -1648,14 +1648,18 @@ int sqlite3_tsd_count = 0;
/*
** If called with allocateFlag==1, then return a pointer to thread
** If called with allocateFlag>1, then return a pointer to thread
** specific data for the current thread. Allocate and zero the
** thread-specific data if it does not already exist necessary.
**
** If called with allocateFlag==0, then check the current thread
** specific data. If it exists and is all zeros, then deallocate it.
** specific data. Return it if it exists. If it does not exist,
** then return NULL.
**
** If called with allocateFlag<0, check to see if the thread specific
** data is allocated and is all zero. If it is then deallocate it.
** Return a pointer to the thread specific data or NULL if it is
** unallocated.
** unallocated or gets deallocated.
*/
ThreadData *sqlite3UnixThreadSpecificData(int allocateFlag){
static const ThreadData zeroData;
@@ -1679,7 +1683,7 @@ ThreadData *sqlite3UnixThreadSpecificData(int allocateFlag){
}
pTsd = pthread_getspecific(key);
if( allocateFlag ){
if( allocateFlag>0 ){
if( pTsd==0 ){
pTsd = sqlite3OsMalloc(sizeof(zeroData));
if( pTsd ){
@@ -1688,7 +1692,8 @@ ThreadData *sqlite3UnixThreadSpecificData(int allocateFlag){
TSD_COUNTER(+1);
}
}
}else if( pTsd!=0 && memcmp(pTsd, &zeroData, sizeof(zeroData))==0 ){
}else if( pTsd!=0 && allocateFlag<0
&& memcmp(pTsd, &zeroData, sizeof(zeroData))==0 ){
sqlite3OsFree(pTsd);
pthread_setspecific(key, 0);
TSD_COUNTER(-1);
@@ -1697,7 +1702,7 @@ ThreadData *sqlite3UnixThreadSpecificData(int allocateFlag){
return pTsd;
#else
static ThreadData *pTsd = 0;
if( allocateFlag ){
if( allocateFlag>0 ){
if( pTsd==0 ){
pTsd = sqlite3OsMalloc( sizeof(zeroData) );
if( pTsd ){
@@ -1705,7 +1710,8 @@ ThreadData *sqlite3UnixThreadSpecificData(int allocateFlag){
TSD_COUNTER(+1);
}
}
}else if( pTsd!=0 && memcmp(pTsd, &zeroData, sizeof(zeroData))==0 ){
}else if( pTsd!=0 && allocateFlag<0
&& memcmp(pTsd, &zeroData, sizeof(zeroData))==0 ){
sqlite3OsFree(pTsd);
TSD_COUNTER(-1);
pTsd = 0;