scripts/build/debug.sh
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun May 20 13:48:26 2007 +0000 (2007-05-20)
changeset 112 ea15433daba0
child 182 223c84ec2d90
permissions -rw-r--r--
Ah! I finally have a progress bar that doesn't stall the build!
- pipe size in Linux is only 8*512=4096 bytes
- pipe size is not setable
- when the feeding process spits out data faster than the eating
process can read it, then the feeding process stalls after 4KiB
of data sent to the pipe
- for us, the progress bar would spawn a sub-shell every line,
and the sub-shell would in turn spawn a 'date' command.
Which was sloooww as hell, and would cause some kind of a
starvation: the pipe was full most of the time, and the
feeding process was stalled all this time.

Now, we use internal variables and a little hack based onan offset
to determine the elapsed time. Much faster this way, but still
CPU-intensive.
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# Wrapper to build the debug facilities
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# List all debug facilities, and parse their scripts
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CT_DEBUG_FACILITY_LIST=
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for f in "${CT_TOP_DIR}/scripts/build/debug/"*.sh; do
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    is_enabled=
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    . "${f}"
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    f=`basename "${f}" .sh`
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    if [ "${is_enabled}" = "y" ]; then
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        CT_DEBUG_FACILITY_LIST="${CT_DEBUG_FACILITY_LIST} ${f}"
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    fi
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done
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# Download the debug facilities
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do_debug_get() {
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    for f in ${CT_DEBUG_FACILITY_LIST}; do
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        do_debug_${f}_get
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    done
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}
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# Extract and patch the debug facilities
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do_debug_extract() {
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    for f in ${CT_DEBUG_FACILITY_LIST}; do
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        do_debug_${f}_extract
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    done
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}
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# Build the debug facilities
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do_debug() {
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    for f in ${CT_DEBUG_FACILITY_LIST}; do
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        do_debug_${f}_build
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    done
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}
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