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https://source.denx.de/u-boot/u-boot.git
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f938479617
Add a new internal API called uthread (Kconfig symbol: UTHREAD) which provides cooperative multi-tasking. The goal is to be able to improve the performance of some parts of U-Boot by overlapping lengthy operations, and also implement background jobs in the U-Boot shell. Each uthread has its own stack allocated on the heap. The default stack size is defined by the UTHREAD_STACK_SIZE symbol and is used when uthread_create() receives zero for the stack_sz argument. The implementation is based on context-switching via initjmp()/setjmp()/ longjmp() and is inspired from barebox threads [1]. A notion of thread group helps with dependencies, such as when a thread needs to block until a number of other threads have returned. The name "uthread" comes from "user-space threads" because the scheduling happens with no help from a higher privileged mode, contrary to more complex models where kernel threads are defined. But the 'u' may as well stand for 'U-Boot' since the bootloader may actually be running at any privilege level and the notion of user vs. kernel may not make much sense in this context. [1] https://github.com/barebox/barebox/blob/master/common/bthread.c Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
33 lines
347 B
ReStructuredText
33 lines
347 B
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.. SPDX-License-Identifier: GPL-2.0+
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U-Boot API documentation
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.. toctree::
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:maxdepth: 2
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bootcount
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clk
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dfu
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dm
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efi
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event
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fs
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getopt
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interrupt
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led
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linker_lists
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lmb
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logging
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nvmem
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part
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pinctrl
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rng
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sandbox
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serial
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setjmp
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sysreset
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timer
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unicode
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uthread
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