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5ab41ca467
This patch removes the iscsi_thread_set->[rx,tx]_post_start_comp that
was originally used synchronize startup between rx and tx threads within
a single thread_set.
Instead, use a single ->ts_activate_sem in iscsi_activate_thread_set()
to wait for both processes to awake in the RX/TX pre handlers.
Also, go ahead and refactor thread_set deallocate code into a common
iscsi_deallocate_thread_one(), and update iscsi_deallocate_thread_sets()
and iscsi_deallocate_extra_thread_sets() use this code
v3 changes:
- Make iscsi_deallocate_thread_one defined as static (Fengguang)
v2 changes:
- Set ISCSI_THREAD_SET_ACTIVE before calling complete in
iscsi_activate_thread_set
- Protect ts->conn sanity checks with ->ts_state_lock in
RX/TX pre handlers
- Add ->ts_activate_sem to save extra context switches per
iscsi_activate_thread_set() call.
- Refactor thread_set shutdown into iscsi_deallocate_thread_one()
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
#ifndef ISCSI_THREAD_QUEUE_H
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#define ISCSI_THREAD_QUEUE_H
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/*
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* Defines for thread sets.
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*/
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extern int iscsi_thread_set_force_reinstatement(struct iscsi_conn *);
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extern int iscsi_allocate_thread_sets(u32);
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extern void iscsi_deallocate_thread_sets(void);
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extern void iscsi_activate_thread_set(struct iscsi_conn *, struct iscsi_thread_set *);
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extern struct iscsi_thread_set *iscsi_get_thread_set(void);
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extern void iscsi_set_thread_clear(struct iscsi_conn *, u8);
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extern void iscsi_set_thread_set_signal(struct iscsi_conn *, u8);
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extern int iscsi_release_thread_set(struct iscsi_conn *);
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extern struct iscsi_conn *iscsi_rx_thread_pre_handler(struct iscsi_thread_set *);
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extern struct iscsi_conn *iscsi_tx_thread_pre_handler(struct iscsi_thread_set *);
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extern int iscsi_thread_set_init(void);
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extern void iscsi_thread_set_free(void);
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extern int iscsi_target_tx_thread(void *);
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extern int iscsi_target_rx_thread(void *);
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#define TARGET_THREAD_SET_COUNT 4
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#define ISCSI_RX_THREAD 1
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#define ISCSI_TX_THREAD 2
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#define ISCSI_RX_THREAD_NAME "iscsi_trx"
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#define ISCSI_TX_THREAD_NAME "iscsi_ttx"
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#define ISCSI_BLOCK_RX_THREAD 0x1
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#define ISCSI_BLOCK_TX_THREAD 0x2
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#define ISCSI_CLEAR_RX_THREAD 0x1
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#define ISCSI_CLEAR_TX_THREAD 0x2
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#define ISCSI_SIGNAL_RX_THREAD 0x1
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#define ISCSI_SIGNAL_TX_THREAD 0x2
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/* struct iscsi_thread_set->status */
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#define ISCSI_THREAD_SET_FREE 1
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#define ISCSI_THREAD_SET_ACTIVE 2
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#define ISCSI_THREAD_SET_DIE 3
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#define ISCSI_THREAD_SET_RESET 4
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#define ISCSI_THREAD_SET_DEALLOCATE_THREADS 5
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/* By default allow a maximum of 32K iSCSI connections */
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#define ISCSI_TS_BITMAP_BITS 32768
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struct iscsi_thread_set {
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/* flags used for blocking and restarting sets */
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int blocked_threads;
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/* flag for creating threads */
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int create_threads;
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/* flag for delaying readding to inactive list */
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int delay_inactive;
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/* status for thread set */
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int status;
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/* which threads have had signals sent */
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int signal_sent;
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/* flag for which threads exited first */
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int thread_clear;
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/* Active threads in the thread set */
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int thread_count;
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/* Unique thread ID */
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u32 thread_id;
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/* pointer to connection if set is active */
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struct iscsi_conn *conn;
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/* used for controlling ts state accesses */
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spinlock_t ts_state_lock;
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/* used for restarting thread queue */
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struct completion rx_restart_comp;
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/* used for restarting thread queue */
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struct completion tx_restart_comp;
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/* used for normal unused blocking */
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struct completion rx_start_comp;
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/* used for normal unused blocking */
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struct completion tx_start_comp;
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/* OS descriptor for rx thread */
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struct task_struct *rx_thread;
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/* OS descriptor for tx thread */
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struct task_struct *tx_thread;
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/* struct iscsi_thread_set in list list head*/
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struct list_head ts_list;
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struct semaphore ts_activate_sem;
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};
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#endif /*** ISCSI_THREAD_QUEUE_H ***/
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