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/*-
* Copyright (c) 2014-2019 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#define MAX_ASYNC_SLEEP_USECS 100000 /* Maximum sleep waiting for work */
#define MAX_ASYNC_YIELD 200 /* Maximum number of yields for work */
#define O2C(op) ((WT_CONNECTION_IMPL *)(op)->iface.connection)
#define O2S(op) (((WT_CONNECTION_IMPL *)(op)->iface.connection)->default_session)
/*
* WT_ASYNC_FORMAT --
* The URI/config/format cache.
*/
struct __wt_async_format {
TAILQ_ENTRY(__wt_async_format) q;
const char *config;
uint64_t cfg_hash; /* Config hash */
const char *uri;
uint64_t uri_hash; /* URI hash */
const char *key_format;
const char *value_format;
};
/*
* WT_ASYNC_OP_IMPL --
* Implementation of the WT_ASYNC_OP.
*/
struct __wt_async_op_impl {
WT_ASYNC_OP iface;
WT_ASYNC_CALLBACK *cb;
uint32_t internal_id; /* Array position id. */
uint64_t unique_id; /* Unique identifier. */
WT_ASYNC_FORMAT *format; /* Format structure */
#define WT_ASYNCOP_ENQUEUED 0 /* Placed on the work queue */
#define WT_ASYNCOP_FREE 1 /* Able to be allocated to user */
#define WT_ASYNCOP_READY 2 /* Allocated, ready for user to use */
#define WT_ASYNCOP_WORKING 3 /* Operation in progress by worker */
uint32_t state;
WT_ASYNC_OPTYPE optype; /* Operation type */
};
/*
* Definition of the async subsystem.
*/
struct __wt_async {
/*
* Ops array protected by the ops_lock.
*/
WT_SPINLOCK ops_lock; /* Locked: ops array */
WT_ASYNC_OP_IMPL *async_ops; /* Async ops */
#define OPS_INVALID_INDEX 0xffffffff
uint32_t ops_index; /* Active slot index */
uint64_t op_id; /* Unique ID counter */
WT_ASYNC_OP_IMPL **async_queue; /* Async ops work queue */
uint32_t async_qsize; /* Async work queue size */
/*
* We need to have two head and tail values. All but one is
* maintained as an ever increasing value to ease wrap around.
*
* alloc_head: the next one to allocate for producers. head: the
* current head visible to consumers. head is always <=
* alloc_head. alloc_tail: the next slot for consumers to
* dequeue. alloc_tail is always <= head. tail_slot: the last
* slot consumed. A producer may need wait for tail_slot to
* advance.
*/
uint64_t alloc_head; /* Next slot to enqueue */
uint64_t head; /* Head visible to worker */
uint64_t alloc_tail; /* Next slot to dequeue */
uint64_t tail_slot; /* Worker slot consumed */
TAILQ_HEAD(__wt_async_format_qh, __wt_async_format) formatqh;
uint32_t cur_queue; /* Currently enqueued */
uint32_t max_queue; /* Maximum enqueued */
#define WT_ASYNC_FLUSH_NONE 0 /* No flush in progress */
#define WT_ASYNC_FLUSH_COMPLETE 1 /* Notify flush caller done */
#define WT_ASYNC_FLUSH_IN_PROGRESS 2 /* Prevent other callers */
#define WT_ASYNC_FLUSHING 3 /* Notify workers */
uint32_t flush_state;
/* Notify any waiting threads when flushing is done. */
WT_CONDVAR *flush_cond;
WT_ASYNC_OP_IMPL flush_op; /* Special flush op */
uint32_t flush_count; /* Worker count */
uint64_t flush_gen; /* Flush generation number */
#define WT_ASYNC_MAX_WORKERS 20
WT_SESSION_IMPL *worker_sessions[WT_ASYNC_MAX_WORKERS];
/* Async worker threads */
wt_thread_t worker_tids[WT_ASYNC_MAX_WORKERS];
uint32_t flags; /* Currently unused. */
};
/*
* WT_ASYNC_CURSOR --
* Async container for a cursor. Each async worker thread
* has a cache of async cursors to reuse for operations.
*/
struct __wt_async_cursor {
TAILQ_ENTRY(__wt_async_cursor) q; /* Worker cache */
uint64_t cfg_hash; /* Config hash */
uint64_t uri_hash; /* URI hash */
WT_CURSOR *c; /* WT cursor */
};
/*
* WT_ASYNC_WORKER_STATE --
* State for an async worker thread.
*/
struct __wt_async_worker_state {
uint32_t id;
TAILQ_HEAD(__wt_cursor_qh, __wt_async_cursor) cursorqh;
uint32_t num_cursors;
};
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