sys_membarrier

kernel::abi::linux::riscv64::proc

Function sys_membarrier 

Source 
pub fn sys_membarrier(
    _abi: &mut LinuxRiscv64Abi,
    trapframe: &mut Trapframe,
) -> usize
Expand description

Linux sys_membarrier implementation (syscall 283)

Memory barrier system call for ensuring memory ordering between threads. This is a stub implementation that always succeeds.

Arguments:

  • cmd: membarrier command (various MEMBARRIER_CMD_* constants)
  • flags: flags for the command (usually 0)
  • cpu_id: CPU ID for per-CPU barriers (usually unused)

Returns:

  • 0 on success
  • Negative error code on failure

Note: This is a no-op stub. On a real system with multiple cores, this would issue appropriate memory barrier instructions to ensure memory ordering visibility across CPUs. For single-core or simple multi-core systems without complex memory reordering, this stub should be sufficient for most applications.