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8ec27f4ca8
creating a gcc specs file (prompted by Dima Ruben). Remove obsolete information and update various tidbits.
68 lines
2.8 KiB
Plaintext
68 lines
2.8 KiB
Plaintext
Some brief notes:
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1) This package is intended to run on FreeBSD 5.0-current or FreeBSD 4.X, i386
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processors only.
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Do not use libc_r with the linuxthreads port, and do not compile/link with the
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-pthread option (which pulls in libc_r). Rather, link with libc (which you will
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get by default).
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Compile your applications that use the linuxthreads port with the following
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command line options:
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-D_THREAD_SAFE -I/usr/local/include/pthread/linuxthreads -llthread -llgcc_r
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Note that the include (-I<path>) directive shown here should appear before any
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other include directive that would cause the compiler to find the FreeBSD file
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/usr/include/pthread.h. Using the FreeBSD pthread.h instead of the linuxthreads
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pthread.h will result in an app that fails in many odd and maybe spectacular
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ways.
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In order to facilitate porting applications which expect a libpthread, you can
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create the following symlinks if you want:
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ln -s /usr/local/lib/liblthread.a /usr/lib/libpthread.a
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ln -s /usr/local/lib/liblthread_p.a /usr/lib/libpthread_p.a
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ln -s /usr/local/lib/liblthread.so.2 /usr/lib/libpthread.so.2
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ln -s /usr/local/lib/liblthread.so.2 /usr/lib/libpthread.so
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/sbin/ldconfig -m /usr/lib
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If you do this, you can instead use:
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-D_THREAD_SAFE -I/usr/local/include/pthread/linuxthreads -lpthread -llgcc_r
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Another option is to create a custom gcc specs file that tells the linker which
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version of libgcc to use. To do this, create a file with the following in it:
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--- (/foo/specs) cut here ---
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*libgcc:
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/usr/local/lib/liblgcc_r.a
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--- (/foo/specs) cut here ---
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Then use the following command line options:
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-B/foo/ -D_THREAD_SAFE -I/usr/local/include/pthread/linuxthreads -llthread
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or if you created symlinks:
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-B/foo/ -D_THREAD_SAFE -I/usr/local/include/pthread/linuxthreads -lpthread
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2) If you plan on having lots of threads, check the sysctl value of
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kern.maxproc. Each kernel thread counts against maxproc. You can increase
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maxproc by changing the MAXUSERS value in your kernel config file. maxproc is
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set at 20 + 16 * MAXUSERS.
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3) Be aware of the following libc issues:
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a) Not all libc calls are thread safe. In particular gmtime, localtime, etc
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are not thread safe. In general, where the pthreads spec calls for "_r"
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functions, these are either not provided, or if provided are not thread safe
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(in most cases) and the related libc calls are not thread safe. This differs
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somewhat from the FreeBSD libc_r library, where some, but not all, of these
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functions are both thread safe and have "_r" versions.
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b) Not all of the libc calls that are supposed to be cancellation points are
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implemented as such. While linux threads has the cancel functions
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implemented, deferred cancellation will not work as required by POSIX
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1003.1c-1995, since the co-operation needed from libc is not complete.
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