FD_CLR (3)           - synchronous I/O multiplexing
FD_ISSET (3)         - synchronous I/O multiplexing
FD_SET (3)           - synchronous I/O multiplexing
FD_ZERO (3)          - synchronous I/O multiplexing
__dev_mc_sync (9)    - Synchonize device's multicast list
__dev_mc_unsync (9)  - Remove synchronized addresses from device
__dev_uc_sync (9)    - Synchonize device's unicast list
__dev_uc_unsync (9)  - Remove synchronized addresses from device
__wake_up_sync_key (9) - wake up threads blocked on a waitqueue.
_newselect (2)       - synchronous I/O multiplexing
ablkcipher_request_set_callback (9) - set asynchronous callback function
adjtime (3)          - correct the time to synchronize the system clock
aead_request_set_callback (9) - set asynchronous callback function
ahash_request_set_callback (9) - set asynchronous callback function
aio (7)              - POSIX asynchronous I/O overview
aio_cancel (3)       - cancel an outstanding asynchronous I/O request
aio_error (3)        - get error status of asynchronous I/O operation
aio_fsync (3)        - asynchronous file synchronization
aio_init (3)         - asynchronous I/O initialization
aio_read (3)         - asynchronous read
aio_return (3)       - get return status of asynchronous I/O operation
aio_suspend (3)      - wait for asynchronous I/O operation or timeout
aio_write (3)        - asynchronous write
akcipher_request_set_callback (9) - Sets an asynchronous callback.
arm_sync_file_range (2) - sync a file segment with disk
ata_sas_async_probe (9) - simply schedule probing and return
ata_scsi_flush_xlat (9) - Translate SCSI SYNCHRONIZE CACHE command
blk_run_queue_async (9) - run a single device queue in workqueue context
blk_start_queue_async (9) - asynchronously restart a previously stopped queue
blk_sync_queue (9)   - cancel any pending callbacks on a queue
cancel_delayed_work_sync (9) - cancel a delayed work and wait for it to finish
cancel_work_sync (9) - cancel a work and wait for it to finish
cond_synchronize_rcu (9) - Conditionally wait for an RCU grace period
cond_synchronize_sched (9) - Conditionally wait for an RCU-sched grace period
corosync (8)         - The Corosync Cluster Engine.
corosync-blackbox (8) - Dump live "flight data" from the corosync "blackbox".
corosync-cfgtool (8) - An administrative tool for corosync.
corosync-cpgtool (8) - A tool for displaying cpg groups and members.
corosync-fplay (8)   - Display "flight data" from the corosync "blackbox".
corosync-keygen (8)  - Generate an authentication key for Corosync.
corosync-notifyd (8) - Listen for important corosync events and send dbus and...
corosync-objctl (8)  - Configure objects in the Object Database
corosync-pload (8)   - Start payload test.
corosync-quorumtool (8) - Set and display quorum settings.
corosync.conf (5)    - corosync executive configuration file
corosync_overview (8) - Corosync overview
crypto_alloc_blkcipher (9) - allocate synchronous block cipher handle
DBD::Gofer::Transport::corostream (3pm) - Async DBD::Gofer stream transport u...
dblink_get_notify (3) - retrieve async notifications on a connection
dblink_get_result (3) - gets an async query result
dblink_is_busy (3)   - checks if connection is busy with an async query
dblink_send_query (3) - sends an async query to a remote database
del_timer_sync (9)   - deactivate a timer and wait for the handler to finish.
disable_irq_nosync (9) - disable an irq without waiting
disk_clear_events (9) - synchronously check, clear and return pending events
doveadm-force-resync (1) - Repair broken mailboxes
dsync (1)            - Dovecot's mailbox synchronization utility
fdatasync (2)        - synchronize a file's in-core state with storage device
fsync (2)            - synchronize a file's in-core state with storage device
gai_cancel (3)       - asynchronous network address and service translation
gai_error (3)        - asynchronous network address and service translation
gai_suspend (3)      - asynchronous network address and service translation
get_state_synchronize_rcu (9) - Snapshot current RCU state
get_state_synchronize_sched (9) - Snapshot current RCU-sched state
getaddrinfo_a (3)    - asynchronous network address and service translation
hsi_async (9)        - Submit an HSI transfer to the controller
hsi_async_read (9)   - Submit a read transfer
hsi_async_write (9)  - Submit a write transfer
input_mt_sync_frame (9) - synchronize mt frame
io_cancel (2)        - cancel an outstanding asynchronous I/O operation
io_destroy (2)       - destroy an asynchronous I/O context
io_getevents (2)     - read asynchronous I/O events from the completion queue
io_setup (2)         - create an asynchronous I/O context
io_submit (2)        - submit asynchronous I/O blocks for processing
Mail::SpamAssassin::AsyncLoop (3pm) - scanner asynchronous event loop
mptscsih_synchronize_cache (9) - Send SYNCHRONIZE_CACHE to all disks.
msync (2)            - synchronize a file with a memory map
nand_sync (9)        - [MTD Interface] sync
napi_synchronize (9) - wait until NAPI is not running
Net::DBus::ASyncReply (3pm) - asynchronous method reply handler
page_cache_async_readahead (9) - file readahead for marked pages
page_cache_sync_readahead (9) - generic file readahead
pg_rewind (1)        - synchronize a PostgreSQL data directory with another d...
pg_test_fsync (1)    - determine fastest wal_sync_method for PostgreSQL
pselect (2)          - synchronous I/O multiplexing
pselect6 (2)         - synchronous I/O multiplexing
regulator_sync_voltage (9) - re-apply last regulator output voltage
request_firmware_nowait (9) - asynchronous version of request_firmware
rpc_call_async (9)   - Perform an asynchronous RPC call
rpc_call_sync (9)    - Perform a synchronous RPC call
rpcb_getport_async (9) - obtain the port for a given RPC service on a given host
rsync (1)            - a fast, versatile, remote (and local) file-copying tool
rsyncd.conf (5)      - configuration file for rsync in daemon mode
rt_sigtimedwait (2)  - synchronously wait for queued signals
scsi_complete_async_scans (9) - Wait for asynchronous scans to complete
scsi_finish_async_scan (9) - asynchronous scan has finished
scsi_prep_async_scan (9) - prepare for an async scan
select (2)           - synchronous I/O multiplexing
select_tut (2)       - synchronous I/O multiplexing
sigevent (7)         - structure for notification from asynchronous routines
sigtimedwait (2)     - synchronously wait for queued signals
sigwaitinfo (2)      - synchronously wait for queued signals
skcipher_request_set_callback (9) - set asynchronous callback function
slapo-syncprov (5)   - Sync Provider overlay to slapd
snd_ctl_sync_vmaster (9) - Sync the vmaster slaves and hook
snd_pcm_set_sync (9) - set the PCM sync id
snd_soc_cache_sync (9) - Sync the register cache with the hardware
snd_soc_component_async_complete (9) - Ensure asynchronous I/O has completed
snd_soc_component_update_bits_async (9) - Perform asynchronous read/modify/wr...
snd_soc_dapm_sync (9) - scan and power dapm paths
snd_soc_dapm_sync_unlocked (9) - scan and power dapm paths
spi_async (9)        - asynchronous SPI transfer
spi_async_locked (9) - version of spi_async with exclusive bus usage
spi_read (9)         - SPI synchronous read
spi_sync (9)         - blocking/synchronous SPI data transfers
spi_sync_locked (9)  - version of spi_sync with exclusive bus usage
spi_sync_transfer (9) - synchronous SPI data transfer
spi_w8r16 (9)        - SPI synchronous 8 bit write followed by 16 bit read
spi_w8r16be (9)      - SPI synchronous 8 bit write followed by 16 bit big-end...
spi_w8r8 (9)         - SPI synchronous 8 bit write followed by 8 bit read
spi_write (9)        - SPI synchronous write
spi_write_then_read (9) - SPI synchronous write followed by read
struct_ablkcipher_alg (9) - asynchronous block cipher definition
struct_ahash_alg (9) - asynchronous message digest definition
struct_blkcipher_alg (9) - synchronous block cipher definition
struct_fence (9)     - software synchronization primitive
struct_shash_alg (9) - synchronous message digest definition
struct_sync_file (9) - sync file to export to the userspace
struct_w1_async_cmd (9) - execute callback from the w1_process kthread
svnsync (1)          - Subversion repository synchronization tool
sync (1)             - flush file system buffers
sync (2)             - commit buffer cache to disk
sync-available (8)   - sync dpkg's available database with apt's database
sync_file_create (9) - creates a sync file
sync_file_range (2)  - sync a file segment with disk
sync_file_range2 (2) - sync a file segment with disk
sync_inode (9)       - write an inode and its pages to disk.
sync_inode_metadata (9) - write an inode to disk
sync_inodes_sb (9)   - sync sb inode pages
sync_mapping_buffers (9) - write out & wait upon a mapping's “associated”...
syncfs (2)           - commit buffer cache to disk
synchronize_hardirq (9) - wait for pending hard IRQ handlers (on other CPUs)
synchronize_irq (9)  - wait for pending IRQ handlers (on other CPUs)
synchronize_net (9)  - Synchronize with packet receive processing
synchronize_rcu (9)  - wait until a grace period has elapsed.
synchronize_rcu_bh (9) - wait until an rcu_bh grace period has elapsed.
synchronize_rcu_tasks (9) - wait until an rcu-tasks grace period has elapsed.
synchronize_sched (9) - wait until an rcu-sched grace period has elapsed.
synchronize_srcu (9) - wait for prior SRCU read-side critical-section completion
synchronize_srcu_expedited (9) - Brute-force SRCU grace period
sys_rt_sigtimedwait (9) - synchronously wait for queued signals specified in ...
systemd-timesyncd (8) - Network Time Synchronization
systemd-timesyncd.service (8) - Network Time Synchronization
try_to_del_timer_sync (9) - Try to deactivate a timer
usb_autopm_get_interface_async (9) - increment a USB interface's PM-usage cou...
usb_autopm_put_interface_async (9) - decrement a USB interface's PM-usage cou...
usb_buffer_dmasync (9) - synchronize DMA and CPU view of buffer(s)
usb_buffer_dmasync_sg (9) - synchronize DMA and CPU view of scatterlist buffe...
usb_sg_wait (9)      - synchronously execute scatter/gather request
usb_submit_urb (9)   - issue an asynchronous transfer request for an endpoint
usb_unlink_anchored_urbs (9) - asynchronously cancel transfer requests en masse
w1_process_callbacks (9) - execute each dev->async_list callback entry
z8530_sync_close (9) - Close a PIO Z8530 channel
z8530_sync_dma_close (9) - Close down DMA I/O
z8530_sync_dma_open (9) - Open a Z8530 for DMA I/O
z8530_sync_open (9)  - Open a Z8530 channel for PIO
z8530_sync_txdma_close (9) - Close down a TX driven DMA channel
z8530_sync_txdma_open (9) - Open a Z8530 for TX driven DMA