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# ====================================================================
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#
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# thread.cdl
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#
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# configuration data related to the kernel threads
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#
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# ====================================================================
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#####ECOSGPLCOPYRIGHTBEGIN####
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## -------------------------------------------
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## This file is part of eCos, the Embedded Configurable Operating System.
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## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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##
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## eCos is free software; you can redistribute it and/or modify it under
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## the terms of the GNU General Public License as published by the Free
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## Software Foundation; either version 2 or (at your option) any later version.
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##
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## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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## WARRANTY; without even the implied warranty of MERCHANTABILITY or
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## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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## for more details.
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##
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## You should have received a copy of the GNU General Public License along
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## with eCos; if not, write to the Free Software Foundation, Inc.,
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## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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##
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## As a special exception, if other files instantiate templates or use macros
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## or inline functions from this file, or you compile this file and link it
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## with other works to produce a work based on this file, this file does not
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## by itself cause the resulting work to be covered by the GNU General Public
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## License. However the source code for this file must still be made available
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## in accordance with section (3) of the GNU General Public License.
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##
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## This exception does not invalidate any other reasons why a work based on
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## this file might be covered by the GNU General Public License.
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##
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## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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## at http://sources.redhat.com/ecos/ecos-license/
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## -------------------------------------------
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#####ECOSGPLCOPYRIGHTEND####
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# ====================================================================
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######DESCRIPTIONBEGIN####
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#
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# Author(s): jskov
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# Original data: nickg
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# Contributors:
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# Date: 1999-07-05
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#
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#####DESCRIPTIONEND####
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#
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# ====================================================================
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cdl_option CYGFUN_KERNEL_THREADS_TIMER {
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display "Allow per-thread timers"
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requires CYGVAR_KERNEL_COUNTERS_CLOCK
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default_value 1
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description "
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This option controls whether or not the kernel should support
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per-thread clock and alarm related functions. Also some of
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the synchronization primitives such as semaphore and
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condition variable timed wait operations require per-thread
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timer support. If none of these facilities are required then
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the option can be disabled."
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}
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cdl_option CYGVAR_KERNEL_THREADS_NAME {
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display "Support optional name for each thread"
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default_value 1
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description "
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Threads may optionally be supplied with a name string that is
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used to identify them during debugging. This name is only
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present if `this option is defined. Disabling it reduces both
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code and data size."
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}
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cdl_option CYGVAR_KERNEL_THREADS_LIST {
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display "Keep track of all threads using a linked list"
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default_value 1
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description "
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Threads may optionally be placed on a housekeeping list so
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that all threads may be located easily. This is useful mainly
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in conjunction with source-level debugging."
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}
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cdl_option CYGFUN_KERNEL_THREADS_STACK_LIMIT {
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display "Keep track of the base of each thread's stack"
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default_value 1
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description "
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This option makes the kernel keep track of the lower limit on
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each thread's stack. It allows the kernel to adjust the lower
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limit, thus making space for per-thread data. Note that it
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does not imply any form of run-time stack overflow checking."
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}
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cdl_component CYGFUN_KERNEL_THREADS_STACK_CHECKING {
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display "Check thread stacks for overflows"
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active_if CYGPKG_INFRA_DEBUG
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active_if CYGDBG_USE_ASSERTS
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default_value 1
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description "
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This option enables a variety of checks for stack overflow
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including signatures at the top and base of thread stacks,
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which are asserted for correctness whenever a thread switches."
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cdl_option CYGFUN_KERNEL_ALL_THREADS_STACK_CHECKING {
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display "Check all threads whenever possible"
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requires CYGVAR_KERNEL_THREADS_LIST
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default_value 0
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description "
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This option enables more active checking of all threads for
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wrongdoing. In theory, checking threads other than the old and new
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executing threads in a thread-switch is pointless, because no other
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thread has run, so no other stack can be exceeded. But errors such
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as memory scribbling, dangling pointers, overlapping use of store
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or errors accessing objects adjacent to a stack which can be very
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hard to find can be detected this way, saving debug time."
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}
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cdl_option CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE {
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display "Signature size in bytes, at stack top and bottom"
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flavor data
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default_value 32
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legal_values 8 to 512
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description "
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This is the size of the area reserved for a signature at the top
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and bottom of all stacks. It also provides a buffer zone for
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detecting overflow before external objects are corrupted, hence the
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ability to vary it here. But if you are short of stack, increasing
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this value will make the overflow more, not less likely, of course."
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}
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}
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cdl_component CYGFUN_KERNEL_THREADS_STACK_MEASUREMENT {
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display "Measure stack usage"
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default_value { 0 != CYGPKG_INFRA_DEBUG }
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description "
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This option allows measurement of each thread's stack by initializing
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it to a predefined value at thread creation time. Later use of the
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cyg_thread_measure_stack_usage() function allows the maximum stack
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usage of the thread so far to be obtained. Note that this is not
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necessarily the true maximum stack usage that the thread will ever
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use since all that has been measured is the stack usage corresponding
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to the code path followed this time, and not the code path that may
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be followed in future."
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cdl_option CYGDBG_KERNEL_THREADS_STACK_MEASUREMENT_VERBOSE_EXIT {
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display "Output stack usage on thread exit"
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default_value 0
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description "
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This will output the measured stack usage on the diagnostic
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output when a thread exits."
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}
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}
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cdl_component CYGVAR_KERNEL_THREADS_DATA {
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display "Support for per-thread data"
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requires CYGFUN_KERNEL_THREADS_STACK_LIMIT
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doc ref/kernel-thread-data.html
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default_value 1
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description "
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It is possible for the kernel to support per-thread data, in
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other words an area of memory specific to each thread which
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can be used to store data for that thread. This per-thread
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data can be used by applications or by other packages such as
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the ISO C library."
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cdl_option CYGNUM_KERNEL_THREADS_DATA_MAX {
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display "Number of words of per-thread data"
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flavor data
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legal_values 4 to 32
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default_value 6
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description "
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It is possible for the kernel to support per-thread data, in
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other words an area of memory specific to each thread which
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can be used to store data for that thread. This per-thread
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data can be used by applications or by other packages such as
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the ISO C library. This configuration option controls the
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number of words of per-thread data that the kernel will
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allow. In the current implementation a bitmask is used to identify
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used per-thread data slots and so the maximum legal value must
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remain 32."
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}
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cdl_component CYGNUM_KERNEL_THREADS_DATA_ALL {
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display "Bitmap of preallocated slots of thread data"
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flavor data
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calculated 15
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description "
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Per thread data options. Per thread data support is based loosely
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on that defined by POSIX. Each thread has an array of slots, up to
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CYGNUM_KERNEL_THREADS_DATA_MAX, that may contain data. Some of the
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slots have been preallocated to specific packages. Others may be
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allocated dynamically."
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cdl_option CYGNUM_KERNEL_THREADS_DATA_KERNEL {
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display "Slot 0 preallocated for the kernel"
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flavor data
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calculated 0
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description "
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This option defines the index of a per-thread data
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slot which is reserved by
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the eCos kernel
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for private use."
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}
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cdl_option CYGNUM_KERNEL_THREADS_DATA_ITRON {
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display "Slot 1 preallocated for uITRON"
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flavor data
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calculated 1
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description "
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This option defines the index of a per-thread data
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slot which is reserved by
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the uITRON compatibility layer
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for private use."
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}
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cdl_option CYGNUM_KERNEL_THREADS_DATA_ERRNO {
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display "Slot 2 preallocated for errno"
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flavor data
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calculated 2
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description "
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This option defines the index of a per-thread data
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slot which is reserved for use by an errno variable."
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}
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cdl_option CYGNUM_KERNEL_THREADS_DATA_POSIX {
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display "Slot 3 preallocated for POSIX"
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flavor data
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calculated 3
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description "
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This option defines the index of a per-thread data
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slot which is reserved by
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POSIX
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for private use."
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}
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}
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}
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cdl_component CYGPKG_KERNEL_THREADS_DESTRUCTORS {
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display "Thread destructors"
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doc ref/kernel-thread-destructors.html
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default_value 0
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description "
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This option enables support for registered destructor functions to
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be called on thread exit."
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cdl_option CYGNUM_KERNEL_THREADS_DESTRUCTORS {
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display "Number of possible destructors"
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flavor data
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legal_values 1 to 65535
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default_value 8
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description "
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This option gives the number of possible destructors allowed.
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Increasing this will increase the size of every
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thread control structure if per-thread destructors are
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enabled."
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}
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cdl_option CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD {
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display "Per-thread destructors"
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default_value 1
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description "
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Enabling this option makes the thread destructors a per-thread
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property, with each thread having its own list of destructors.
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Disabling this option makes the thread destructor list
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global so all threads have the same destructors."
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}
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}
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cdl_option CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE {
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display "Stack size for the idle thread"
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flavor data
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legal_values 512 to 65536
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default_value 2048
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description "
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This configuration option specifies the stack size in bytes
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for the idle thread. Unless the HAL is configured to use a
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separate interrupt stack this size must be sufficient to meet
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the requirements of all interrupt handlers - these
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requirements are cumulative if nested interrupted are
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enabled. Depending on the target architecture, the stack size
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typically has to be a multiple of eight or sixteen bytes.
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This will be overridden where it is used if the
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architectural HAL requires a minimum stack size
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to handle interrupts correctly."
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}
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# ---------------------------------------------------------------------
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# Thread-related miscellania.
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cdl_option CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT {
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display "Maximal suspend count"
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flavor data
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default_value 500
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description "
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This option provides for an assertion that the count value for
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counted thread suspends do not exceed set limits. This is to help
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with debugging, to allow a runaway loop, for example, to be
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detected more easily.
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If the option is not defined, no assert is included. Whether asserts
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are themselves included depends on infrastructure configury in
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infra.h"
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}
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cdl_option CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT {
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display "Maximal wake count"
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flavor data
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default_value 500
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description "
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309 |
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This option provides for an assertion that the count value for
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counted thread wakeups do not exceed set limits. This is to
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help with debugging, to allow a runaaway loop, for example, to
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be detected more easily.
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If the option is not defined, no assert is included. Whether asserts
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are themselves included depends on infrastructure configury in
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infra.h"
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}
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#if CYGNUM_KERNEL_SCHED_PRIORITIES == 1
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# define CYGIMP_IDLE_THREAD_YIELD
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#endif
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cdl_option CYGIMP_IDLE_THREAD_YIELD {
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display "Idle thread must always yield"
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calculated 1
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active_if (CYGNUM_KERNEL_SCHED_PRIORITIES == 1)
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description "
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If the scheduler configuration only has a single priority
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level, then the idle thread must yield each time around its loop."
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}
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# EOF thread.cdl
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