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https://github.com/zephyrproject-rtos/zephyr
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ca872a44c1
This implements a file descriptor used for event notification that behaves like the eventfd in Linux. The eventfd supports nonblocking operation by setting the EFD_NONBLOCK flag and semaphore operation by settings the EFD_SEMAPHORE flag. The major use case for this is when using poll() and the sockets that you poll are dynamic. When a new socket needs to be added to the poll, there must be some way to wake the thread and update the pollfds before calling poll again. One way to solve it is to have a timeout set in the poll call and only update the pollfds during a timeout but that is not a very nice solution. By instead including an eventfd in the pollfds, it is possible to wake the polling thread by simply writing to the eventfd. Signed-off-by: Tobias Svehagen <tobias.svehagen@gmail.com>
127 lines
3.0 KiB
Plaintext
127 lines
3.0 KiB
Plaintext
# Copyright (c) 2018 Intel Corporation
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# SPDX-License-Identifier: Apache-2.0
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config POSIX_MAX_FDS
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int "Maximum number of open file descriptors"
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default 16 if POSIX_API
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default 4
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help
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Maximum number of open file descriptors, this includes
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files, sockets, special devices, etc.
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config POSIX_API
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depends on !ARCH_POSIX
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bool "POSIX APIs"
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select LEGACY_TIMEOUT_API
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help
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Enable mostly-standards-compliant implementations of
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various POSIX (IEEE 1003.1) APIs.
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config PTHREAD_IPC
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bool "POSIX pthread IPC API"
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default y if POSIX_API
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help
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This enables a mostly-standards-compliant implementation of
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the pthread mutex, condition variable and barrier IPC
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mechanisms.
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if PTHREAD_IPC
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config MAX_PTHREAD_COUNT
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int "Maximum simultaneously active pthread count in POSIX application"
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default 5
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range 0 255
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help
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Maximum number of simultaneously active threads in a POSIX application.
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config SEM_VALUE_MAX
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int "Maximum semaphore limit"
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default 32767
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range 1 32767
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help
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Maximum semaphore count in POSIX compliant Application.
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endif # PTHREAD_IPC
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config POSIX_CLOCK
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bool "POSIX clock, timer, and sleep APIs"
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default y if POSIX_API
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help
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This enables POSIX clock\_\*(), timer\_\*(), and \*sleep()
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functions.
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config MAX_TIMER_COUNT
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int "Maximum timer count in POSIX application"
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default 5
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range 0 255
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help
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Mention maximum number of timers in POSIX compliant application.
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config POSIX_MQUEUE
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bool "Enable POSIX message queue"
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default y if POSIX_API
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help
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This enabled POSIX message queue related APIs.
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if POSIX_MQUEUE
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config MSG_COUNT_MAX
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int "Maximum number of messages in message queue"
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default 16
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help
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Mention maximum number of messages in message queue in POSIX compliant
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application.
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config MSG_SIZE_MAX
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int "Maximum size of a message"
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default 16
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help
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Mention maximum size of message in bytes.
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config MQUEUE_NAMELEN_MAX
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int "Maximum size of a name length"
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default 16
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range 2 255
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help
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Mention length of message queue name in number of characters.
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endif
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config POSIX_FS
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bool "Enable POSIX file system API support"
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default y if POSIX_API
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depends on FILE_SYSTEM
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help
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This enables POSIX style file system related APIs.
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config POSIX_MAX_OPEN_FILES
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int "Maximum number of open file descriptors"
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default 16
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depends on POSIX_FS
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help
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Maximum number of open files. Note that this setting
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is additionally bounded by CONFIG_POSIX_MAX_FDS.
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# The name of this option is mandated by zephyr_interface_library_named
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# cmake directive.
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config APP_LINK_WITH_POSIX_SUBSYS
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bool "Make POSIX headers available to application"
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default y
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depends on POSIX_API
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help
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Add POSIX subsystem header files to the 'app' include path.
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config EVENTFD
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bool "Enable support for eventfd"
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depends on !ARCH_POSIX
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help
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Enable support for event file descriptors, eventfd. An eventfd can
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be used as an event wait/notify mechanism together with POSIX calls
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like read, write and poll.
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config EVENTFD_MAX
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int "Maximum number of eventfd's"
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depends on EVENTFD
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default 1
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range 1 4096
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help
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The maximum number of supported event file descriptors.
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