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Add palloc_extended for frontend and backend.

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This commit also adds pg_malloc_extended for frontend. These interfaces
can be used to control at a lower level memory allocation using an interface
similar to MemoryContextAllocExtended. For example, the callers can specify
MCXT_ALLOC_NO_OOM if they want to suppress the "out of memory" error while
allocating the memory and handle a NULL return value.

Michael Paquier, reviewed by me.
This commit is contained in:
Fujii Masao
2015-04-03 17:36:12 +09:00
parent bc49d9324a
commit 8c8a886268
4 changed files with 85 additions and 12 deletions
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16
src/include/common/fe_memutils.h
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@ -9,10 +9,23 @@
#ifndef FE_MEMUTILS_H
#define FE_MEMUTILS_H
/* "Safe" memory allocation functions --- these exit(1) on failure */
/*
* Flags for pg_malloc_extended and palloc_extended, deliberately named
* the same as the backend flags.
*/
#define MCXT_ALLOC_HUGE 0x01 /* allow huge allocation (> 1 GB)
* not actually used for frontends */
#define MCXT_ALLOC_NO_OOM 0x02 /* no failure if out-of-memory */
#define MCXT_ALLOC_ZERO 0x04 /* zero allocated memory */
/*
* "Safe" memory allocation functions --- these exit(1) on failure
* (except pg_malloc_extended with MCXT_ALLOC_NO_OOM)
*/
extern char *pg_strdup(const char *in);
extern void *pg_malloc(size_t size);
extern void *pg_malloc0(size_t size);
extern void *pg_malloc_extended(size_t size, int flags);
extern void *pg_realloc(void *pointer, size_t size);
extern void pg_free(void *pointer);
@ -20,6 +33,7 @@ extern void pg_free(void *pointer);
extern char *pstrdup(const char *in);
extern void *palloc(Size size);
extern void *palloc0(Size size);
extern void *palloc_extended(Size size, int flags);
extern void *repalloc(void *pointer, Size size);
extern void pfree(void *pointer);