| # 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 |
| ]) |