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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> |
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| .. | ||
| bootcount.rst | ||
| clk.rst | ||
| dfu.rst | ||
| dm.rst | ||
| efi.rst | ||
| event.rst | ||
| fs.rst | ||
| getopt.rst | ||
| index.rst | ||
| interrupt.rst | ||
| led.rst | ||
| linker_lists.rst | ||
| lmb.rst | ||
| logging.rst | ||
| nvmem.rst | ||
| part.rst | ||
| pinctrl.rst | ||
| rng.rst | ||
| sandbox.rst | ||
| serial.rst | ||
| setjmp.rst | ||
| sysreset.rst | ||
| timer.rst | ||
| unicode.rst | ||
| uthread.rst | ||