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MXS-1376 DCBMM removed

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Related to the zombie processing and as zombie processing is not
needed anymore, it can be removed.
This commit is contained in:
Johan Wikman 2017-08-25 13:07:22 +03:00
parent 9c25e6d995
commit 5832352a08
1 changed files with 0 additions and 26 deletions
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26
include/maxscale/dcb.h
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@ -54,31 +54,6 @@ typedef struct dcbstats
#define DCBSTATS_INIT {0}
/**
* The data structure that is embedded witin a DCB and manages the complex memory
* management issues of a DCB.
*
* The DCB structures are used as the user data within the polling loop. This means that
* polling threads may aschronously wake up and access these structures. It is not possible
* to simple remove the DCB from the epoll system and then free the data, as every thread
* that is currently running an epoll call must wake up and re-issue the epoll_wait system
* call, the is the only way we can be sure that no polling thread is pending a wakeup or
* processing an event that will access the DCB.
*
* We solve this issue by making the dcb_free routine merely mark a DCB as a zombie and
* place it on a special zombie list. Before placing the DCB on the zombie list we create
* a bitmask with a bit set in it for each active polling thread. Each thread will call
* a routine to process the zombie list at the end of the polling loop. This routine
* will clear the bit value that corresponds to the calling thread. Once the bitmask
* is completely cleared the DCB can finally be freed and removed from the zombie list.
*/
typedef struct
{
struct dcb *next; /*< Next pointer for the zombie list */
} DCBMM;
#define DCBMM_INIT { NULL }
/* DCB states */
typedef enum
{
@ -191,7 +166,6 @@ typedef struct dcb
struct service *service; /**< The related service */
void *data; /**< Specific client data, shared between DCBs of this session */
void *authenticator_data; /**< The authenticator data for this DCB */
DCBMM memdata; /**< The data related to DCB memory management */
DCB_CALLBACK *callbacks; /**< The list of callbacks for the DCB */
int64_t last_read; /*< Last time the DCB received data */
struct server *server; /**< The associated backend server */