nuttx/fs/aio/Kconfig

#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#

config FS_AIO
	bool "Asynchronous I/O support"
	default n
	depends on SCHED_WORKQUEUE
	---help---
		Enable support for aynchronous I/O.  This selection enables the
		interfaces declared in include/aio.h.

if FS_AIO

config FS_NAIOC
	int "Pre-allocated AIO containers"
	default 8
	---help---
		The AIO containers hold an AIO control block and appends information
		needed by the logic running within the RTOS.  These structures are
		pre-allocated, the number pre-allocated controlled by this setting.

		This setting controls the number of asynchronous I/O operations that
		can be queued at one time.  When this count is exhausted, the caller
		of aio_read(), aio_write(), or aio_fsync() will be forced to wait
		for an available container.  That wait is minimized because each
		container is released prior to starting the next I/O.

		The AIO logic includes priority inheritance logic to prevent
		priority inversion problems:  The priority of the low-priority work
		queue will be boosted, if necessary, to level of the waiting thread.

endif