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