251 lines
5.0 KiB
ReStructuredText
251 lines
5.0 KiB
ReStructuredText
.. _kernel_apis:
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Kernel APIs
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###########
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This section contains APIs for the kernel's core services,
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as described in the :ref:`kernel`.
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.. important::
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Unless otherwise noted these APIs can be used by threads, but not by ISRs.
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.. contents::
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:depth: 1
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:local:
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:backlinks: top
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Threads
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*******
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A thread is an independently scheduled series of instructions that implements
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a portion of an application's processing. Threads are used to perform processing
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that is too lengthy or too complex to be performed by an ISR.
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(See :ref:`threads_v2`.)
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.. doxygengroup:: thread_apis
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:project: Zephyr
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:content-only:
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Workqueues
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**********
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A workqueue processes a series of work items by executing the associated
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functions in a dedicated thread. Workqueues are typically used by an ISR
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or high-priority thread to offload non-urgent processing.
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(See :ref:`workqueues_v2`.)
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.. doxygengroup:: workqueue_apis
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:project: Zephyr
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:content-only:
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Clocks
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******
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Kernel clocks enable threads and ISRs to measure the passage of time
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with either normal and high precision.
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(See :ref:`clocks_v2`.)
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.. doxygengroup:: clock_apis
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:project: Zephyr
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:content-only:
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Timers
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******
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Timers enable threads to measure the passage of time, and to optionally execute
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an action when the timer expires.
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(See :ref:`timers_v2`.)
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.. doxygengroup:: timer_apis
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:project: Zephyr
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:content-only:
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Memory Slabs
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************
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Memory slabs enable the dynamic allocation and release of fixed-size
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memory blocks.
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(See :ref:`memory_slabs_v2`.)
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.. doxygengroup:: mem_slab_apis
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:project: Zephyr
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:content-only:
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Memory Pools
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************
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Memory pools enable the dynamic allocation and release of variable-size
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memory blocks.
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(See :ref:`memory_pools_v2`.)
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.. doxygengroup:: mem_pool_apis
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:project: Zephyr
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:content-only:
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Heap Memory Pool
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****************
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The heap memory pools enable the dynamic allocation and release of memory
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in a :cpp:func:`malloc()`-like manner.
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(See :ref:`heap_v2`.)
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.. doxygengroup:: heap_apis
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:project: Zephyr
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:content-only:
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Semaphores
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**********
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Semaphores provide traditional counting semaphore capabilities.
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(See :ref:`semaphores_v2`.)
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.. doxygengroup:: semaphore_apis
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:project: Zephyr
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:content-only:
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Mutexes
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*******
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Mutexes provide traditional reentrant mutex capabilities
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with basic priority inheritance.
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(See :ref:`mutexes_v2`.)
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.. doxygengroup:: mutex_apis
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:project: Zephyr
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:content-only:
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Alerts
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******
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Alerts enable an application to perform asynchronous signalling,
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somewhat akin to Unix-style signals.
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(See :ref:`alerts_v2`.)
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.. doxygengroup:: alert_apis
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:project: Zephyr
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:content-only:
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Fifos
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*****
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Fifos provide traditional first in, first out (FIFO) queuing of data items
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of any size.
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(See :ref:`fifos_v2`.)
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.. doxygengroup:: fifo_apis
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:project: Zephyr
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:content-only:
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Lifos
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*****
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Lifos provide traditional last in, first out (LIFO) queuing of data items
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of any size.
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(See :ref:`lifos_v2`.)
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.. doxygengroup:: lifo_apis
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:project: Zephyr
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:content-only:
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Stacks
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******
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Stacks provide traditional last in, first out (LIFO) queuing of 32-bit
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data items.
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(See :ref:`stacks_v2`.)
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.. doxygengroup:: stack_apis
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:project: Zephyr
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:content-only:
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Message Queues
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**************
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Message queues provide a simple message queuing mechanism
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for fixed-size data items.
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(See :ref:`message_queues_v2`.)
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.. doxygengroup:: msgq_apis
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:project: Zephyr
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:content-only:
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Mailboxes
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*********
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Mailboxes provide an enhanced message queuing mechanism
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for variable-size messages.
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(See :ref:`mailboxes_v2`.)
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.. doxygengroup:: mailbox_apis
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:project: Zephyr
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:content-only:
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Pipes
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*****
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Pipes provide a traditional anonymous pipe mechanism for sending
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variable-size chunks of data, in whole or in part.
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(See :ref:`pipes_v2`.)
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.. doxygengroup:: pipe_apis
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:project: Zephyr
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:content-only:
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Interrupt Service Routines (ISRs)
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*********************************
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An interrupt service routine is a series of instructions that is
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executed asynchronously in response to a hardware or software interrupt.
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(See :ref:`interrupts_v2`.)
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.. doxygengroup:: isr_apis
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:project: Zephyr
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:content-only:
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Atomic Services
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***************
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The atomic services enable multiple threads and ISRs to read and modify
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32-bit variables in an uninterruptible manner.
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(See :ref:`atomic_v2`.)
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.. important::
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All atomic services APIs can be used by both threads and ISRs.
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.. doxygengroup:: atomic_apis
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:project: Zephyr
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:content-only:
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Floating Point Services
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***********************
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The floating point services enable threads to use a board's floating point
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registers.
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(See :ref:`float_v2`.)
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.. doxygengroup:: float_apis
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:project: Zephyr
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:content-only:
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Ring Buffers
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************
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Ring buffers enable simple first in, first out (FIFO) queuing
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of variable-size data items.
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(See :ref:`ring_buffers_v2`.)
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.. doxygengroup:: ring_buffer_apis
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:project: Zephyr
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:content-only:
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Legacy APIs
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***********
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These APIs will be deprecated in an upcoming release so we recommend you avoid
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using them in your applications.
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.. doxygengroup:: legacy_apis
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:project: Zephyr
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:content-only:
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