greenplumn fe_memutils 源码
greenplumn fe_memutils 代码
文件路径：/src/common/fe_memutils.c
/*-------------------------------------------------------------------------
*
* fe_memutils.c
* memory management support for frontend code
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/common/fe_memutils.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#error "This file is not expected to be compiled for backend code"
#endif
#include "postgres_fe.h"
static inline void *
pg_malloc_internal(size_t size, int flags)
{
void *tmp;
/* Avoid unportable behavior of malloc(0) */
if (size == 0)
size = 1;
tmp = malloc(size);
if (tmp == NULL)
{
if ((flags & MCXT_ALLOC_NO_OOM) == 0)
{
fprintf(stderr, _("out of memory\n"));
exit(EXIT_FAILURE);
}
return NULL;
}
if ((flags & MCXT_ALLOC_ZERO) != 0)
MemSet(tmp, 0, size);
return tmp;
}
void *
pg_malloc(size_t size)
{
return pg_malloc_internal(size, 0);
}
void *
pg_malloc0(size_t size)
{
return pg_malloc_internal(size, MCXT_ALLOC_ZERO);
}
void *
pg_malloc_extended(size_t size, int flags)
{
return pg_malloc_internal(size, flags);
}
void *
pg_realloc(void *ptr, size_t size)
{
void *tmp;
/* Avoid unportable behavior of realloc(NULL, 0) */
if (ptr == NULL && size == 0)
size = 1;
tmp = realloc(ptr, size);
if (!tmp)
{
fprintf(stderr, _("out of memory\n"));
exit(EXIT_FAILURE);
}
return tmp;
}
/*
* "Safe" wrapper around strdup().
*/
char *
pg_strdup(const char *in)
{
char *tmp;
if (!in)
{
fprintf(stderr,
_("cannot duplicate null pointer (internal error)\n"));
exit(EXIT_FAILURE);
}
tmp = strdup(in);
if (!tmp)
{
fprintf(stderr, _("out of memory\n"));
exit(EXIT_FAILURE);
}
return tmp;
}
void
pg_free(void *ptr)
{
if (ptr != NULL)
free(ptr);
}
/*
* Frontend emulation of backend memory management functions. Useful for
* programs that compile backend files.
*/
void *
palloc(Size size)
{
return pg_malloc_internal(size, 0);
}
void *
palloc0(Size size)
{
return pg_malloc_internal(size, MCXT_ALLOC_ZERO);
}
void *
palloc_extended(Size size, int flags)
{
return pg_malloc_internal(size, flags);
}
void
pfree(void *pointer)
{
pg_free(pointer);
}
char *
pstrdup(const char *in)
{
return pg_strdup(in);
}
void *
repalloc(void *pointer, Size size)
{
return pg_realloc(pointer, size);
}
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