greenplumn cdbselect 源码
greenplumn cdbselect 代码
文件路径：/src/include/cdb/cdbselect.h
/*-------------------------------------------------------------------------
*
* cdbselect.h
*
* Provides equivalents to FD_SET/FD_ZERO -- but handle more than
* 1024 file descriptors (as far as I can tell all of our platforms
* support 65536).
*
* Portions Copyright (c) 2006-2008, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/cdb/cdbselect.h
*
*-------------------------------------------------------------------------
*/
#ifndef CDBSELECT_H
#define CDBSELECT_H
#if !defined(_WIN32)
/* 8-bit bytes 32 or 64-bit ints */
typedef struct
{
int32 __fds_bits[65536/(sizeof(int32) * 8)];
} mpp_fd_set;
#define MPP_FD_ZERO(setp) (memset((char *)(setp), 0, sizeof(mpp_fd_set)))
#define MPP_FD_WORD(fd) ((fd) >> 5)
#define MPP_FD_BIT(fd) (1 << ((fd) & 0x1f))
#define MPP_FD_SET(fd, set) do{ \
if (fd > 65535) \
elog(FATAL,"Internal error: Using fd > 65535 in MPP_FD_SET"); \
((set)->__fds_bits[MPP_FD_WORD(fd)] = ((set)->__fds_bits[MPP_FD_WORD(fd)]) | MPP_FD_BIT(fd)); \
} while(0)
#define MPP_FD_CLR(fd, set) ((set)->__fds_bits[MPP_FD_WORD(fd)] &= ~MPP_FD_BIT(fd))
#define MPP_FD_ISSET(fd, set) (((set)->__fds_bits[MPP_FD_WORD(fd)] & MPP_FD_BIT(fd)) ? 1 : 0)
#else
#define mpp_fd_set fd_set
#define MPP_FD_ZERO(setp) FD_ZERO(setp)
#define MPP_FD_SET(fd, set) do{ \
if (fd > FD_SETSIZE) \
elog(FATAL,"Internal error: Using fd > FD_SETSIZE in FD_SET (MPP_FD_SET)"); \
FD_SET(fd, set); \
} while(0)
#define MPP_FD_CLR(fd, set) FD_CLR(fd, set)
#define MPP_FD_ISSET(fd, set) FD_ISSET(fd, set)
#endif
#endif
相关信息
相关文章
greenplumn cdbappendonlyblockdirectory 源码
greenplumn cdbappendonlystorage 源码
greenplumn cdbappendonlystorage_int 源码
greenplumn cdbappendonlystorageformat 源码
greenplumn cdbappendonlystoragelayer 源码
greenplumn cdbappendonlystorageread 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦