musl/include/sys/membarrier.h

#ifndef _SYS_MEMBARRIER_H
#define _SYS_MEMBARRIER_H

#define MEMBARRIER_CMD_QUERY 0
#define MEMBARRIER_CMD_GLOBAL 1
#define MEMBARRIER_CMD_GLOBAL_EXPEDITED 2
#define MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED 4
#define MEMBARRIER_CMD_PRIVATE_EXPEDITED 8
#define MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED 16
#define MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE 32
#define MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE 64

#define MEMBARRIER_CMD_SHARED MEMBARRIER_CMD_GLOBAL

int membarrier(int, int);

#endif