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/*-
* Copyright (c) 2014-2017 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#define WT_THREAD_PAUSE 10 /* Thread pause timeout in seconds */
/*
* WT_THREAD --
* Encapsulation of a thread that belongs to a thread group.
*/
struct __wt_thread {
WT_SESSION_IMPL *session;
u_int id;
wt_thread_t tid;
/*
* WT_THREAD and thread-group function flags, merged because
* WT_THREAD_PANIC_FAIL appears in both groups.
*/
#define WT_THREAD_ACTIVE 0x01 /* thread is active or paused */
#define WT_THREAD_CAN_WAIT 0x02 /* WT_SESSION_CAN_WAIT */
#define WT_THREAD_PANIC_FAIL 0x04 /* panic if the thread fails */
#define WT_THREAD_RUN 0x08 /* thread is running */
uint32_t flags;
/*
* Condition signalled when a thread becomes active. Paused
* threads wait on this condition.
*/
WT_CONDVAR *pause_cond;
/* The check function used by all threads. */
bool (*chk_func)(WT_SESSION_IMPL *session);
/* The runner function used by all threads. */
int (*run_func)(WT_SESSION_IMPL *session, WT_THREAD *context);
/* The stop function used by all threads. */
int (*stop_func)(WT_SESSION_IMPL *session, WT_THREAD *context);
};
/*
* WT_THREAD_GROUP --
* Encapsulation of a group of utility threads.
*/
struct __wt_thread_group {
uint32_t alloc; /* Size of allocated group */
uint32_t max; /* Max threads in group */
uint32_t min; /* Min threads in group */
uint32_t current_threads;/* Number of active threads */
const char *name; /* Name */
WT_RWLOCK lock; /* Protects group changes */
/*
* Condition signalled when wanting to wake up threads that are
* part of the group - for example when shutting down. This condition
* can also be used by group owners to ensure state changes are noticed.
*/
WT_CONDVAR *wait_cond;
/*
* The threads need to be held in an array of arrays, not an array of
* structures because the array is reallocated as it grows, which
* causes threads to loose track of their context is realloc moves the
* memory.
*/
WT_THREAD **threads;
/* The check function used by all threads. */
bool (*chk_func)(WT_SESSION_IMPL *session);
/* The runner function used by all threads. */
int (*run_func)(WT_SESSION_IMPL *session, WT_THREAD *context);
/* The stop function used by all threads. May be NULL */
int (*stop_func)(WT_SESSION_IMPL *session, WT_THREAD *context);
};
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