Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/third_party/rust/lmdb-rkv/src/database.rs b/third_party/rust/lmdb-rkv/src/database.rs
new file mode 100644
index 0000000000..848af89380
--- /dev/null
+++ b/third_party/rust/lmdb-rkv/src/database.rs
@@ -0,0 +1,56 @@
+use libc::c_uint;
+use std::ffi::CString;
+use std::ptr;
+
+use ffi;
+
+use error::{
+    lmdb_result,
+    Result,
+};
+
+/// A handle to an individual database in an environment.
+///
+/// A database handle denotes the name and parameters of a database in an environment.
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct Database {
+    dbi: ffi::MDB_dbi,
+}
+
+impl Database {
+    /// Opens a new database handle in the given transaction.
+    ///
+    /// Prefer using `Environment::open_db`, `Environment::create_db`, `TransactionExt::open_db`,
+    /// or `RwTransaction::create_db`.
+    pub(crate) unsafe fn new(txn: *mut ffi::MDB_txn, name: Option<&str>, flags: c_uint) -> Result<Database> {
+        let c_name = name.map(|n| CString::new(n).unwrap());
+        let name_ptr = if let Some(ref c_name) = c_name {
+            c_name.as_ptr()
+        } else {
+            ptr::null()
+        };
+        let mut dbi: ffi::MDB_dbi = 0;
+        lmdb_result(ffi::mdb_dbi_open(txn, name_ptr, flags, &mut dbi))?;
+        Ok(Database {
+            dbi,
+        })
+    }
+
+    pub(crate) fn freelist_db() -> Database {
+        Database {
+            dbi: 0,
+        }
+    }
+
+    /// Returns the underlying LMDB database handle.
+    ///
+    /// The caller **must** ensure that the handle is not used after the lifetime of the
+    /// environment, or after the database has been closed.
+    #[allow(clippy::trivially_copy_pass_by_ref)]
+    pub fn dbi(&self) -> ffi::MDB_dbi {
+        self.dbi
+    }
+}
+
+unsafe impl Sync for Database {}
+unsafe impl Send for Database {}