main/syscalls/system_barrier.md

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# zx_system_barrier

## Summary

Issue a barrier on other running threads.

## Declaration

```c
#include <zircon/syscalls-next.h>

zx_status_t zx_system_barrier(uint32_t options);
```

## Description

Issues a barrier of the requested type on all running threads.

### Options: types of barriers

#### ZX_SYSTEM_BARRIER_DATA_MEMORY

This issues a data memory barrier on all running threads.

#### ZX_SYSTEM_BARRIER_INSTRUCTION_STREAM

This issues a memory barrier and serializes the instruction stream on all running threads.

## Rights

This operation does not require any rights.

## Return value

`ZX_OK` if the requested barriers were issued.

## Errors

`ZX_ERR_INVALID_ARGS` *options* contains invalid options.