glibc/sysdeps/nptl/pthread-offsets.h

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#include <bits/wordsize.h>
/* These values are based on internal generic types from
bits/struct_mutex.h and bits/struct_rwlock.h. */
#if __WORDSIZE == 64
# define __PTHREAD_MUTEX_KIND_OFFSET 16
#else
# define __PTHREAD_MUTEX_KIND_OFFSET 12
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
# define __PTHREAD_RWLOCK_FLAGS_OFFSET 27
#else
# define __PTHREAD_RWLOCK_FLAGS_OFFSET 24
#endif