zircon/vdso/membarrier.fidl

// Copyright 2026 The Fuchsia Authors.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library zx;

@transport("Syscall")
closed protocol Membarrier {
    /// ## Summary
    ///
    /// Issue a data membarrier on all running threads within this process.
    ///
    /// ## Declaration
    ///
    /// ```c
    /// #include <zircon/syscalls.h>
    ///
    /// void zx_membarrier_sync_process_data(void);
    /// ```
    ///
    /// ## Description
    ///
    /// Issues a data membarrier on all running threads within this process.
    /// When this call returns, all running threads in the system that share a
    /// futex domain with the calling thread will pass through a state where
    /// all data memory accesses are synchronized.
    ///
    /// ## Rights
    ///
    /// This operation does not require any rights.
    ///
    strict SyncProcessData();

    /// ## Summary
    ///
    /// Issue an instruction membarrier on all running threads within this
    /// process.
    ///
    /// ## Declaration
    ///
    /// ```c
    /// #include <zircon/syscalls.h>
    ///
    /// void zx_membarrier_sync_process_insn(void);
    /// ```
    ///
    /// ## Description
    ///
    /// Issues a instruction stream membarrier on all running threads within
    /// this process. When this call returns, all running threads in the system
    /// that share a futex domain with the calling thread will pass through a
    /// state where all instruction stream and data memory accesses are
    /// synchronized.
    ///
    /// ## Rights
    ///
    /// This operation does not require any rights.
    ///
    strict SyncProcessInsn();
};