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Overview
| Comment: | Avoid unnecessary mutexes in the pcache1 implementation in the common case where no auxiliary page cache memory is configured. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | begin-concurrent-branch-3.19 |
| Files: | files | file ages | folders |
| SHA3-256: |
5cd9ff87d8aa62ad97ad64b580e042b8 |
| User & Date: | drh 2017-08-28 17:30:34.999 |
Context
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2017-08-28
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| 17:32 | Add the --enable-update-limit option to the ./configure script. (Leaf check-in: f545db6c27 user: drh tags: begin-concurrent-branch-3.19) | |
| 17:30 | Avoid unnecessary mutexes in the pcache1 implementation in the common case where no auxiliary page cache memory is configured. (check-in: 5cd9ff87d8 user: drh tags: begin-concurrent-branch-3.19) | |
| 17:26 | Remove the rarely-used scratch memory allocator. This makes the code smaller, faster, and easier to maintain. In place of the scratch allocator, add the SQLITE_CONFIG_SMALL_MALLOC configuration option that provides a hint to SQLite that large memory allocations should be avoided. (check-in: cc440400a1 user: drh tags: begin-concurrent-branch-3.19) | |
| 16:11 | Avoid unnecessary mutexes in the pcache1 implementation in the common case where no auxiliary page cache memory is configured. (check-in: 1ba051e34d user: drh tags: trunk) | |
Changes
Changes to src/pcache1.c.
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241 242 243 244 245 246 247 248 249 250 251 252 253 254 |
** This routine is called from sqlite3_initialize() and so it is guaranteed
** to be serialized already. There is no need for further mutexing.
*/
void sqlite3PCacheBufferSetup(void *pBuf, int sz, int n){
if( pcache1.isInit ){
PgFreeslot *p;
if( pBuf==0 ) sz = n = 0;
sz = ROUNDDOWN8(sz);
pcache1.szSlot = sz;
pcache1.nSlot = pcache1.nFreeSlot = n;
pcache1.nReserve = n>90 ? 10 : (n/10 + 1);
pcache1.pStart = pBuf;
pcache1.pFree = 0;
pcache1.bUnderPressure = 0;
| > | 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 |
** This routine is called from sqlite3_initialize() and so it is guaranteed
** to be serialized already. There is no need for further mutexing.
*/
void sqlite3PCacheBufferSetup(void *pBuf, int sz, int n){
if( pcache1.isInit ){
PgFreeslot *p;
if( pBuf==0 ) sz = n = 0;
if( n==0 ) sz = 0;
sz = ROUNDDOWN8(sz);
pcache1.szSlot = sz;
pcache1.nSlot = pcache1.nFreeSlot = n;
pcache1.nReserve = n>90 ? 10 : (n/10 + 1);
pcache1.pStart = pBuf;
pcache1.pFree = 0;
pcache1.bUnderPressure = 0;
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| ︙ | ︙ |