| Austin Schuh | 906616c | 2019-01-21 20:25:11 -0800 | [diff] [blame] | 1 | # TODO(csilvers): it would be better to actually try to link against |
| 2 | # -pthreads, to make sure it defines these methods, but that may be |
| 3 | # too hard, since pthread support is really tricky. |
| 4 | |
| 5 | # Check for support for pthread_rwlock_init() etc. |
| 6 | # These aren't posix, but are widely supported. To get them on linux, |
| 7 | # you need to define _XOPEN_SOURCE first, so this check assumes your |
| 8 | # application does that. |
| 9 | # |
| 10 | # Note: OS X (as of 6/1/06) seems to support pthread_rwlock, but |
| 11 | # doesn't define PTHREAD_RWLOCK_INITIALIZER. Therefore, we don't test |
| 12 | # that particularly macro. It's probably best if you don't use that |
| 13 | # macro in your code either. |
| 14 | |
| 15 | AC_DEFUN([AC_RWLOCK], |
| 16 | [AC_CACHE_CHECK(support for pthread_rwlock_* functions, |
| 17 | ac_cv_rwlock, |
| 18 | [AC_LANG_SAVE |
| 19 | AC_LANG_C |
| 20 | AC_TRY_COMPILE([#define _XOPEN_SOURCE 500 |
| 21 | #include <pthread.h>], |
| 22 | [pthread_rwlock_t l; pthread_rwlock_init(&l, NULL); |
| 23 | pthread_rwlock_rdlock(&l); |
| 24 | return 0;], |
| 25 | ac_cv_rwlock=yes, ac_cv_rwlock=no) |
| 26 | AC_LANG_RESTORE |
| 27 | ]) |
| 28 | if test "$ac_cv_rwlock" = yes; then |
| 29 | AC_DEFINE(HAVE_RWLOCK,1,[define if the compiler implements pthread_rwlock_*]) |
| 30 | fi |
| 31 | ]) |