Struct deltachat::sql::pool::InnerPool

struct InnerPool {
    connections: Mutex<Vec<Connection>>,
    semaphore: Arc<Semaphore>,
    write_mutex: Arc<Mutex<()>>,
}

Inner connection pool.

Fields

connections: Mutex<Vec<Connection>>

Available connections.

semaphore: Arc<Semaphore>

Counts the number of available connections.

write_mutex: Arc<Mutex<()>>

Write mutex.

This mutex ensures there is at most one write connection with query_only=0.

This mutex is locked when write connection is outside the pool.

Implementations

impl InnerPool

fn put(&self, connection: Connection)

Puts a connection into the pool.

The connection could be new or returned back.

pub async fn get(self: Arc<Self>, query_only: bool) -> Result<PooledConnection>

Retrieves a connection from the pool.

Sets query_only pragma to the provided value to prevent accidentaly misuse of connection for writing when reading is intended. Only pass query_only=false if you want to use the connection for writing.

Trait Implementations

impl Debug for InnerPool

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.