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We do not yet support UTHREADS in xPL phases. However, we have the need
to dummy out certain functions so that xPL can build when full U-Boot
has UTHREADS enabled. Update the few places that need to use
CONFIG_IS_ENABLED so that we have the correct dummy in xPL.
Signed-off-by: Tom Rini <[email protected]>
Acked-by: Jerome Forissier <[email protected]>
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Fix Sphinx warnings:
$ make htmldocs
[...]
./include/uthread.h:56: warning: cannot understand function prototype: 'enum uthread_mutex_state '
./include/uthread.h:64: warning: cannot understand function prototype: 'struct uthread_mutex '
./include/uthread.h:56: warning: cannot understand function prototype: 'enum uthread_mutex_state '
./include/uthread.h:64: warning: cannot understand function prototype: 'struct uthread_mutex '
Signed-off-by: Jerome Forissier <[email protected]>
Reported-by: Tom Rini <[email protected]>
Tested-by: Heinrich Schuchardt <[email protected]>
Acked-by: Ilias Apalodimas <[email protected]>
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Add struct uthread_mutex and uthread_mutex_lock(),
uthread_mutex_trylock(), uthread_mutex_unlock() to protect shared data
structures from concurrent modifications.
Signed-off-by: Jerome Forissier <[email protected]>
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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 <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
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