Struct mariadb_sys::MDL_request

#[repr(C)]
pub struct MDL_request {
    pub type_: Type,
    pub duration: Type,
    pub next_in_list: *mut MDL_request,
    pub prev_in_list: *mut *mut MDL_request,
    pub ticket: *mut MDL_ticket,
    pub key: MDL_key,
    pub m_src_file: *const c_char,
    pub m_src_line: uint,
}

A pending metadata lock request.

A lock request and a granted metadata lock are represented by different classes because they have different allocation sites and hence different lifetimes. The allocation of lock requests is controlled from outside of the MDL subsystem, while allocation of granted locks (tickets) is controlled within the MDL subsystem.

MDL_request is a C structure, you don’t need to call a constructor or destructor for it.

Fields

type_: Type

Type of metadata lock.

duration: Type

Duration for requested lock.

next_in_list: *mut MDL_request

Pointers for participating in the list of lock requests for this context.

prev_in_list: *mut *mut MDL_request

ticket: *mut MDL_ticket

Pointer to the lock ticket object for this lock request. Valid only if this lock request is satisfied.

key: MDL_key

A lock is requested based on a fully qualified name and type.

m_src_file: *const c_char

m_src_line: uint

Implementations

impl MDL_request

pub unsafe fn init_with_source( &mut self, namespace_arg: Type, db_arg: *const c_char, name_arg: *const c_char, mdl_type_arg: Type, mdl_duration_arg: Type, src_file: *const c_char, src_line: uint )

pub unsafe fn init_by_key_with_source( &mut self, key_arg: *const MDL_key, mdl_type_arg: Type, mdl_duration_arg: Type, src_file: *const c_char, src_line: uint )

Trait Implementations

impl Debug for MDL_request

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

Formats the value using the given formatter.