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Overview
| Comment: | Only do the specialized MacOS single-core zone_malloc initialization if compiled with the SQLITE_MIGHT_BE_SINGLE_CORE flag. This avoids a (harmless) warning about OSAtomicCompareAndSwapPtrBarrier() being deprecated. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
4e6a03d9e12b120d15946b025f97a976 |
| User & Date: | drh 2017-03-18 13:59:46 |
Context
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2017-03-20
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| 13:03 | Documentation fix: SQLITE_SOURCE_ID is a now a SHA3-256 hash. check-in: 2aa22509 user: drh tags: trunk | |
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2017-03-18
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| 13:59 | Only do the specialized MacOS single-core zone_malloc initialization if compiled with the SQLITE_MIGHT_BE_SINGLE_CORE flag. This avoids a (harmless) warning about OSAtomicCompareAndSwapPtrBarrier() being deprecated. check-in: 4e6a03d9 user: drh tags: trunk | |
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2017-03-17
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| 23:08 | Fix an error in the newly revised documentation for SQLITE_LIMIT_VDBE_OP. No changes to code. check-in: f4cf8635 user: drh tags: trunk | |
Changes
Changes to src/mem1.c.
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/*
** Use the zone allocator available on apple products unless the
** SQLITE_WITHOUT_ZONEMALLOC symbol is defined.
*/
#include <sys/sysctl.h>
#include <malloc/malloc.h>
#include <libkern/OSAtomic.h>
static malloc_zone_t* _sqliteZone_;
#define SQLITE_MALLOC(x) malloc_zone_malloc(_sqliteZone_, (x))
#define SQLITE_FREE(x) malloc_zone_free(_sqliteZone_, (x));
#define SQLITE_REALLOC(x,y) malloc_zone_realloc(_sqliteZone_, (x), (y))
#define SQLITE_MALLOCSIZE(x) \
(_sqliteZone_ ? _sqliteZone_->size(_sqliteZone_,x) : malloc_size(x))
................................................................................
}
/*
** Initialize this module.
*/
static int sqlite3MemInit(void *NotUsed){
#if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC)
int cpuCount;
size_t len;
if( _sqliteZone_ ){
return SQLITE_OK;
}
len = sizeof(cpuCount);
/* One usually wants to use hw.acctivecpu for MT decisions, but not here */
sysctlbyname("hw.ncpu", &cpuCount, &len, NULL, 0);
if( cpuCount>1 ){
/* defer MT decisions to system malloc */
_sqliteZone_ = malloc_default_zone();
}else{
/* only 1 core, use our own zone to contention over global locks,
** e.g. we have our own dedicated locks */
bool success;
malloc_zone_t* newzone = malloc_create_zone(4096, 0);
malloc_set_zone_name(newzone, "Sqlite_Heap");
do{
success = OSAtomicCompareAndSwapPtrBarrier(NULL, newzone,
(void * volatile *)&_sqliteZone_);
}while(!_sqliteZone_);
if( !success ){
/* somebody registered a zone first */
malloc_destroy_zone(newzone);
}
}
#endif
UNUSED_PARAMETER(NotUsed);
return SQLITE_OK;
}
/*
** Deinitialize this module.
*/
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/* ** Use the zone allocator available on apple products unless the ** SQLITE_WITHOUT_ZONEMALLOC symbol is defined. */ #include <sys/sysctl.h> #include <malloc/malloc.h> #ifdef SQLITE_MIGHT_BE_SINGLE_CORE #include <libkern/OSAtomic.h> #endif /* SQLITE_MIGHT_BE_SINGLE_CORE */ static malloc_zone_t* _sqliteZone_; #define SQLITE_MALLOC(x) malloc_zone_malloc(_sqliteZone_, (x)) #define SQLITE_FREE(x) malloc_zone_free(_sqliteZone_, (x)); #define SQLITE_REALLOC(x,y) malloc_zone_realloc(_sqliteZone_, (x), (y)) #define SQLITE_MALLOCSIZE(x) \ (_sqliteZone_ ? _sqliteZone_->size(_sqliteZone_,x) : malloc_size(x)) ................................................................................ } /* ** Initialize this module. */ static int sqlite3MemInit(void *NotUsed){ #if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC) if( _sqliteZone_ ){ return SQLITE_OK; } #ifndef SQLITE_MIGHT_BE_SINGLE_CORE /* If not compiled with the SQLITE_MIGHT_BE_SINGLE_CORE flag, assume ** that multiple cores are always available. This is the default case. */ _sqliteZone_ = malloc_default_zone(); #else /* With the SQLITE_MIGHT_BE_SINGLE_CORE compile-time option, check the ** number of cores. Different malloc() strategies are used for single-core and ** multi-core machines. */ { int cpuCount; size_t len; len = sizeof(cpuCount); /* One usually wants to use hw.acctivecpu for MT decisions, but not here */ sysctlbyname("hw.ncpu", &cpuCount, &len, NULL, 0); if( cpuCount>1 ){ /* defer MT decisions to system malloc */ _sqliteZone_ = malloc_default_zone(); }else{ /* only 1 core, use our own zone to contention over global locks, ** e.g. we have our own dedicated locks */ bool success; malloc_zone_t* newzone = malloc_create_zone(4096, 0); malloc_set_zone_name(newzone, "Sqlite_Heap"); do{ success = OSAtomicCompareAndSwapPtrBarrier(NULL, newzone, (void * volatile *)&_sqliteZone_); }while(!_sqliteZone_); if( !success ){ /* somebody registered a zone first */ malloc_destroy_zone(newzone); } } } #endif /* SQLITE_MIGHT_BE_SINGLE_CORE */ #endif /* defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC) */ UNUSED_PARAMETER(NotUsed); return SQLITE_OK; } /* ** Deinitialize this module. */ |