No-op the sqlite3_memory_alarm() interface in a different way, that does
not break legacy memory behavior. This is a re-do of check-in [5d3f5df4da9f40d5]. FossilOrigin-Name: 8250e2a487ee12c9a2dea5603ab60aed51e5dc7b
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drh
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f5eac36a64
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14
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@ -1,5 +1,5 @@
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C Fix\sharmless\scompiler\swarning\sin\sFTS5.
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D 2015-09-09T23:54:46.415
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C No-op\sthe\ssqlite3_memory_alarm()\sinterface\sin\sa\sdifferent\sway,\sthat\sdoes\nnot\sbreak\slegacy\smemory\sbehavior.\s\sThis\sis\sa\sre-do\sof\ncheck-in\s[5d3f5df4da9f40d5].
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D 2015-09-10T01:22:09.178
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F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
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F Makefile.in f85066ce844a28b671aaeeff320921cd0ce36239
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F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
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@ -305,7 +305,7 @@ F src/legacy.c ba1863ea58c4c840335a84ec276fc2b25e22bc4e
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F src/lempar.c d344a95d60c24e2f490ee59db9784b1b17439012
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F src/loadext.c dfcee8c7c032cd0fd55af3e0fc1fcfb01e426df2
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F src/main.c e17fcffae4306a9b8334faf3bac80d7396850b54
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F src/malloc.c 021012e28a81ffdabf4c30ec3df6ce1f6cc93f1d
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F src/malloc.c 3a37ce6979a40f499d8cea9e9ab4e8517854d35d
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F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
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F src/mem1.c abe6ee469b6c5a35c7f22bfeb9c9bac664a1c987
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F src/mem2.c f1940d9e91948dd6a908fbb9ce3835c36b5d83c3
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@ -1383,7 +1383,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
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F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
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F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
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F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
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P 8d2ed150a7a15626965cf994ef48c3ab61eca6ec
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R 9c684262bd2bed914ee53743d3728f7e
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U mistachkin
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Z 5aaf25a787ca8169e60e163e7c3cad6b
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P 86146a731d75eb25279c0e072c0bdda593de905d
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R 7c5553c63d5721a9d16f1642ebb06bea
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U drh
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Z 0fce0dbaade5235ccf22a67355771bfc
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@ -1 +1 @@
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86146a731d75eb25279c0e072c0bdda593de905d
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8250e2a487ee12c9a2dea5603ab60aed51e5dc7b
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104
src/malloc.c
104
src/malloc.c
@ -45,7 +45,7 @@ typedef struct ScratchFreeslot {
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*/
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static SQLITE_WSD struct Mem0Global {
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sqlite3_mutex *mutex; /* Mutex to serialize access */
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sqlite3_int64 alarmThreshold; /* The soft heap limit */
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sqlite3_int64 alarmThreshold; /* The soft heap limit */
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/*
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** Pointers to the end of sqlite3GlobalConfig.pScratch memory
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@ -73,59 +73,20 @@ sqlite3_mutex *sqlite3MallocMutex(void){
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return mem0.mutex;
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}
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/*
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** Return the amount of memory currently in use.
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*/
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static sqlite3_int64 memInUse(void){
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assert( sqlite3_mutex_held(mem0.mutex) );
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return sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
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}
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/*
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** Called when the soft heap limit is exceeded for an allocation
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** of nBytes.
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*/
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#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
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static void sqlite3HeapLimitExceeded(int nByte){
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sqlite3_int64 excess = memInUse() + nByte - mem0.alarmThreshold;
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sqlite3_mutex_leave(mem0.mutex);
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sqlite3_release_memory((int)(excess & 0x7fffffff));
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sqlite3_mutex_enter(mem0.mutex);
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}
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#else
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# define sqlite3HeapLimitExceeded(X) /* no-op */
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#endif
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/*
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** Check to see if increasing the total memory usage by nNew bytes
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** will exceed the soft heap limit.
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**
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** If the soft heap limit is exceeded, set the mem0.nearlyFull flag
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** and invoke sqlite3HeapLimitExceeded() to try to free up some
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** memory.
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*/
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static void sqlite3CheckSoftHeapLimit(int nNew){
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assert( sqlite3_mutex_held(mem0.mutex) );
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if( mem0.alarmThreshold>0 ){
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if( mem0.alarmThreshold-nNew >= memInUse() ){
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mem0.nearlyFull = 1;
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sqlite3HeapLimitExceeded(nNew);
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}else{
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mem0.nearlyFull = 0;
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}
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}
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}
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#ifndef SQLITE_OMIT_DEPRECATED
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/*
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** Deprecated external interface. First deprecated 2007-11-05. Changed
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** into a no-op on 2015-09-02.
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** Deprecated external interface. It used to set an alarm callback
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** that was invoked when memory usage grew too large. Now it is a
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** no-op.
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*/
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int sqlite3_memory_alarm(
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void(*xCallback)(void *pArg, sqlite3_int64 used,int N),
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void *pArg,
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sqlite3_int64 iThreshold
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){
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(void)xCallback;
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(void)pArg;
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(void)iThreshold;
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return SQLITE_OK;
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}
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#endif
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@ -136,20 +97,24 @@ int sqlite3_memory_alarm(
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*/
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sqlite3_int64 sqlite3_soft_heap_limit64(sqlite3_int64 n){
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sqlite3_int64 priorLimit;
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sqlite3_int64 excess;
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sqlite3_int64 nUsed;
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#ifndef SQLITE_OMIT_AUTOINIT
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int rc = sqlite3_initialize();
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if( rc ) return -1;
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#endif
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sqlite3_mutex_enter(mem0.mutex);
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priorLimit = mem0.alarmThreshold;
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if( n>0 ){
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mem0.alarmThreshold = n;
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sqlite3CheckSoftHeapLimit(0);
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}else if( n==0 ){
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mem0.alarmThreshold = 0;
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mem0.nearlyFull = 0;
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if( n<0 ){
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sqlite3_mutex_leave(mem0.mutex);
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return priorLimit;
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}
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mem0.alarmThreshold = n;
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nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
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mem0.nearlyFull = (n>0 && n<=nUsed);
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sqlite3_mutex_leave(mem0.mutex);
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excess = sqlite3_memory_used() - n;
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if( excess>0 ) sqlite3_release_memory((int)(excess & 0x7fffffff));
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return priorLimit;
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}
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void sqlite3_soft_heap_limit(int n){
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@ -240,6 +205,16 @@ sqlite3_int64 sqlite3_memory_highwater(int resetFlag){
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return mx;
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}
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/*
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** Trigger the alarm
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*/
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static void sqlite3MallocAlarm(int nByte){
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if( mem0.alarmThreshold<=0 ) return;
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sqlite3_mutex_leave(mem0.mutex);
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sqlite3_release_memory(nByte);
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sqlite3_mutex_enter(mem0.mutex);
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}
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/*
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** Do a memory allocation with statistics and alarms. Assume the
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** lock is already held.
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@ -250,11 +225,19 @@ static int mallocWithAlarm(int n, void **pp){
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assert( sqlite3_mutex_held(mem0.mutex) );
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nFull = sqlite3GlobalConfig.m.xRoundup(n);
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sqlite3StatusSet(SQLITE_STATUS_MALLOC_SIZE, n);
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sqlite3CheckSoftHeapLimit(nFull);
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if( mem0.alarmThreshold>0 ){
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sqlite3_int64 nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
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if( nUsed >= mem0.alarmThreshold - nFull ){
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mem0.nearlyFull = 1;
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sqlite3MallocAlarm(nFull);
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}else{
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mem0.nearlyFull = 0;
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}
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}
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p = sqlite3GlobalConfig.m.xMalloc(nFull);
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#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
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if( p==0 && mem0.alarmThreshold ){
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sqlite3HeapLimitExceeded(nFull);
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if( p==0 && mem0.alarmThreshold>0 ){
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sqlite3MallocAlarm(nFull);
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p = sqlite3GlobalConfig.m.xMalloc(nFull);
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}
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#endif
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@ -537,14 +520,15 @@ void *sqlite3Realloc(void *pOld, u64 nBytes){
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sqlite3_mutex_enter(mem0.mutex);
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sqlite3StatusSet(SQLITE_STATUS_MALLOC_SIZE, (int)nBytes);
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nDiff = nNew - nOld;
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sqlite3CheckSoftHeapLimit(nDiff);
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if( sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED) >=
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mem0.alarmThreshold-nDiff ){
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sqlite3MallocAlarm(nDiff);
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}
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pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
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#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
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if( pNew==0 && mem0.alarmThreshold ){
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sqlite3HeapLimitExceeded((int)nBytes);
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if( pNew==0 && mem0.alarmThreshold>0 ){
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sqlite3MallocAlarm((int)nBytes);
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pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
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}
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#endif
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if( pNew ){
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nNew = sqlite3MallocSize(pNew);
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sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nNew-nOld);
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