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- # TODO(csilvers): it would be better to actually try to link against
- # -pthreads, to make sure it defines these methods, but that may be
- # too hard, since pthread support is really tricky.
- # Check for support for pthread_rwlock_init() etc.
- # These aren't posix, but are widely supported. To get them on linux,
- # you need to define _XOPEN_SOURCE first, so this check assumes your
- # application does that.
- #
- # Note: OS X (as of 6/1/06) seems to support pthread_rwlock, but
- # doesn't define PTHREAD_RWLOCK_INITIALIZER. Therefore, we don't test
- # that particularly macro. It's probably best if you don't use that
- # macro in your code either.
- AC_DEFUN([AC_RWLOCK],
- [AC_CACHE_CHECK(support for pthread_rwlock_* functions,
- ac_cv_rwlock,
- [AC_LANG_SAVE
- AC_LANG_C
- AC_TRY_COMPILE([#define _XOPEN_SOURCE 500
- #include <pthread.h>],
- [pthread_rwlock_t l; pthread_rwlock_init(&l, NULL);
- pthread_rwlock_rdlock(&l);
- return 0;],
- ac_cv_rwlock=yes, ac_cv_rwlock=no)
- AC_LANG_RESTORE
- ])
- if test "$ac_cv_rwlock" = yes; then
- AC_DEFINE(HAVE_RWLOCK,1,[define if the compiler implements pthread_rwlock_*])
- fi
- ])
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