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Add the sqlite3_status64() interface. Make the new interface and the legacy

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sqlite3_status() both atomic and threadsafe.  Check threadsafety using
assert()s.

FossilOrigin-Name: 1ce8e8fa4b866aafa12b1da0eb4d02321af9293e
This commit is contained in:
drh
2015-03-23 17:25:18 +00:00
parent 74893a4cdb
commit af89fe66ea
8 changed files with 144 additions and 55 deletions
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33
src/malloc.c
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@@ -75,6 +75,13 @@ static SQLITE_WSD struct Mem0Global {
#define mem0 GLOBAL(struct Mem0Global, mem0)
/*
** Return the memory allocator mutex. sqlite3_status() needs it.
*/
sqlite3_mutex *sqlite3MallocMutex(void){
return mem0.mutex;
}
/*
** This routine runs when the memory allocator sees that the
** total memory allocation is about to exceed the soft heap
@@ -97,7 +104,7 @@ static int sqlite3MemoryAlarm(
void *pArg,
sqlite3_int64 iThreshold
){
int nUsed;
sqlite3_int64 nUsed;
sqlite3_mutex_enter(mem0.mutex);
mem0.alarmCallback = xCallback;
mem0.alarmArg = pArg;
@@ -266,7 +273,7 @@ static int mallocWithAlarm(int n, void **pp){
nFull = sqlite3GlobalConfig.m.xRoundup(n);
sqlite3StatusSet(SQLITE_STATUS_MALLOC_SIZE, n);
if( mem0.alarmCallback!=0 ){
int nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
sqlite3_int64 nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
if( nUsed >= mem0.alarmThreshold - nFull ){
mem0.nearlyFull = 1;
sqlite3MallocAlarm(nFull);
@@ -283,8 +290,8 @@ static int mallocWithAlarm(int n, void **pp){
#endif
if( p ){
nFull = sqlite3MallocSize(p);
sqlite3StatusAdd(SQLITE_STATUS_MEMORY_USED, nFull);
sqlite3StatusAdd(SQLITE_STATUS_MALLOC_COUNT, 1);
sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nFull);
sqlite3StatusUp(SQLITE_STATUS_MALLOC_COUNT, 1);
}
*pp = p;
return nFull;
@@ -361,14 +368,14 @@ void *sqlite3ScratchMalloc(int n){
p = mem0.pScratchFree;
mem0.pScratchFree = mem0.pScratchFree->pNext;
mem0.nScratchFree--;
sqlite3StatusAdd(SQLITE_STATUS_SCRATCH_USED, 1);
sqlite3StatusUp(SQLITE_STATUS_SCRATCH_USED, 1);
sqlite3_mutex_leave(mem0.mutex);
}else{
sqlite3_mutex_leave(mem0.mutex);
p = sqlite3Malloc(n);
if( sqlite3GlobalConfig.bMemstat && p ){
sqlite3_mutex_enter(mem0.mutex);
sqlite3StatusAdd(SQLITE_STATUS_SCRATCH_OVERFLOW, sqlite3MallocSize(p));
sqlite3StatusUp(SQLITE_STATUS_SCRATCH_OVERFLOW, sqlite3MallocSize(p));
sqlite3_mutex_leave(mem0.mutex);
}
sqlite3MemdebugSetType(p, MEMTYPE_SCRATCH);
@@ -409,7 +416,7 @@ void sqlite3ScratchFree(void *p){
mem0.pScratchFree = pSlot;
mem0.nScratchFree++;
assert( mem0.nScratchFree <= (u32)sqlite3GlobalConfig.nScratch );
sqlite3StatusAdd(SQLITE_STATUS_SCRATCH_USED, -1);
sqlite3StatusDown(SQLITE_STATUS_SCRATCH_USED, 1);
sqlite3_mutex_leave(mem0.mutex);
}else{
/* Release memory back to the heap */
@@ -419,9 +426,9 @@ void sqlite3ScratchFree(void *p){
if( sqlite3GlobalConfig.bMemstat ){
int iSize = sqlite3MallocSize(p);
sqlite3_mutex_enter(mem0.mutex);
sqlite3StatusAdd(SQLITE_STATUS_SCRATCH_OVERFLOW, -iSize);
sqlite3StatusAdd(SQLITE_STATUS_MEMORY_USED, -iSize);
sqlite3StatusAdd(SQLITE_STATUS_MALLOC_COUNT, -1);
sqlite3StatusDown(SQLITE_STATUS_SCRATCH_OVERFLOW, iSize);
sqlite3StatusDown(SQLITE_STATUS_MEMORY_USED, iSize);
sqlite3StatusDown(SQLITE_STATUS_MALLOC_COUNT, 1);
sqlite3GlobalConfig.m.xFree(p);
sqlite3_mutex_leave(mem0.mutex);
}else{
@@ -481,8 +488,8 @@ void sqlite3_free(void *p){
assert( sqlite3MemdebugNoType(p, (u8)~MEMTYPE_HEAP) );
if( sqlite3GlobalConfig.bMemstat ){
sqlite3_mutex_enter(mem0.mutex);
sqlite3StatusAdd(SQLITE_STATUS_MEMORY_USED, -sqlite3MallocSize(p));
sqlite3StatusAdd(SQLITE_STATUS_MALLOC_COUNT, -1);
sqlite3StatusDown(SQLITE_STATUS_MEMORY_USED, sqlite3MallocSize(p));
sqlite3StatusDown(SQLITE_STATUS_MALLOC_COUNT, 1);
sqlite3GlobalConfig.m.xFree(p);
sqlite3_mutex_leave(mem0.mutex);
}else{
@@ -570,7 +577,7 @@ void *sqlite3Realloc(void *pOld, u64 nBytes){
}
if( pNew ){
nNew = sqlite3MallocSize(pNew);
sqlite3StatusAdd(SQLITE_STATUS_MEMORY_USED, nNew-nOld);
sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nNew-nOld);
}
sqlite3_mutex_leave(mem0.mutex);
}else{