---
title: sync
sidebarTitle: sync
---

# `prefect.concurrency.v1.sync`

## Functions

### `concurrency` <sup><a href="https://github.com/PrefectHQ/prefect/blob/main/src/prefect/concurrency/v1/sync.py#L19" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
concurrency(names: Union[str, list[str]], task_run_id: UUID, timeout_seconds: Optional[float] = None) -> Generator[None, None, None]
```


A context manager that acquires and releases concurrency slots from the
given concurrency limits.

**Args:**
- `names`: The names of the concurrency limits to acquire.
- `task_run_id`: The task run ID acquiring the limits.
- `timeout_seconds`: The number of seconds to wait to acquire the limits before
raising a `TimeoutError`. A timeout of `None` will wait indefinitely.

**Raises:**
- `TimeoutError`: If the limits are not acquired within the given timeout.

Example:
A simple example of using the sync `concurrency` context manager:
```python
from prefect.concurrency.v1.sync import concurrency

def resource_heavy():
    with concurrency("test"):
        print("Resource heavy task")

def main():
    resource_heavy()
```

