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config/libc.in
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun May 20 13:48:26 2007 +0000 (2007-05-20)
changeset 112 ea15433daba0
parent 1 eeea35fbf182
child 136 22b5ef41df97
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. 
     1 # C library options

     2 

     3 menu "C-library"

     4 

     5 choice

     6     bool

     7     prompt "C-library to use:"

     8     default LIBC_GLIBC

     9 

    10 config LIBC_GLIBC

    11     bool

    12     prompt "glibc"

    13     select LIBC_SUPPORT_NPTL

    14     select LIBC_SUPPORT_LINUXTHREADS

    15 

    16 config LIBC_UCLIBC

    17     bool

    18     prompt "uClibc"

    19     select LIBC_SUPPORT_LINUXTHREADS

    20 

    21 endchoice

    22 

    23 config LIBC_VERSION

    24     string

    25 

    26 config LIBC

    27     string

    28     default "glibc" if LIBC_GLIBC

    29     default "uClibc" if LIBC_UCLIBC

    30 

    31 config LIBC_SUPPORT_NPTL

    32     bool

    33     default n

    34 

    35 config LIBC_SUPPORT_LINUXTHREADS

    36     bool

    37     default n

    38 

    39 choice

    40     bool

    41     prompt "Threading implentation to use:"

    42     default LIBC_THREADS_NPTL           if LIBC_SUPPORT_NPTL

    43     default LIBC_THREADS_LINUXTHREADS   if LIBC_SUPPORT_LINUXTHREADS && ! LIBC_SUPPORT_NPTL

    44     default LIBC_THREADS_NONE           if ! LIBC_SUPPORT_LINUXTHREADS && ! LIBC_SUPPORT_NPTL

    45     depends on EXPERIMENTAL

    46 

    47 config LIBC_THREADS_NPTL

    48     bool

    49     prompt "nptl (EXPERIMENTAL)"

    50     depends on LIBC_SUPPORT_NPTL

    51     depends on EXPERIMENTAL

    52 

    53 config LIBC_THREADS_LINUXTHREADS

    54     bool

    55     prompt "linuxthreads"

    56     depends on LIBC_SUPPORT_LINUXTHREADS

    57 

    58 config LIBC_THREADS_NONE

    59     bool

    60     prompt "none"

    61 

    62 endchoice

    63 

    64 if LIBC_GLIBC

    65 source config/libc_glibc.in

    66 endif

    67 

    68 if LIBC_UCLIBC

    69 source config/libc_uClibc.in

    70 endif

    71 

    72 endmenu
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