greenplumn fe_memutils 源码
greenplumn fe_memutils 代码
文件路径：/src/include/common/fe_memutils.h
/*
* fe_memutils.h
* memory management support for frontend code
*
* Copyright (c) 2003-2019, PostgreSQL Global Development Group
*
* src/include/common/fe_memutils.h
*/
#ifndef FE_MEMUTILS_H
#define FE_MEMUTILS_H
/*
* 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);
/* Equivalent functions, deliberately named the same as backend functions */
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);
/* sprintf into a palloc'd buffer --- these are in psprintf.c */
extern char *psprintf(const char *fmt,...) pg_attribute_printf(1, 2);
extern size_t pvsnprintf(char *buf, size_t len, const char *fmt, va_list args) pg_attribute_printf(3, 0);
#endif /* FE_MEMUTILS_H */
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