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posix: pthread: support stack sizes larger than 65k

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A previous size optimization capped the pthread_attr_t stacksize
property at 65536. Some Zephyr users felt that was not large
enough for specific use cases.

Modify struct pthread_attr to support large stack sizes by
default with the flexibility to allow users to vary the number
of bits used for both stacksizes and guardsizes.

The default guardsize remains zero sinze Zephyr's stack
allocators already pad stacks with a guard area based on other
config parameters, and since Zephyr is already designed to
support both SW and HW stack protection at the kernel layer.

Signed-off-by: Christopher Friedt <cfriedt@meta.com>
This commit is contained in:
Christopher Friedt 2023-12-22 14:54:07 -05:00 • committed by Chris Friedt
commit fcd139d7af
4 changed files with 70 additions and 63 deletions
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21
lib/posix/Kconfig.pthread
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@ -27,9 +27,28 @@ config PTHREAD_RECYCLER_DELAY_MS
Note: this option should be considered temporary and will likely be
removed once a more synchronous solution is available.
config POSIX_PTHREAD_ATTR_STACKSIZE_BITS
int "Significant bits for pthread_attr_t stacksize"
range 8 31
default 23
help
This value plays a part in determining the maximum supported
pthread_attr_t stacksize. Valid stacksizes are in the range
[1, N], where N = 1 << M, and M is this configuration value.
config POSIX_PTHREAD_ATTR_GUARDSIZE_BITS
int "Significant bits for pthread_attr_t guardsize"
range 1 31
default 9
help
This value plays a part in determining the maximum supported
pthread_attr_t guardsize. Valid guardsizes are in the range
[0, N-1], where N = 1 << M, and M is this configuration value.
Actual guardsize values may be rounded-up.
config POSIX_PTHREAD_ATTR_GUARDSIZE_DEFAULT
int "Default size of stack guard area"
range 0 65536
default 0
help
This is the default amount of space to reserve at the overflow end of a