diff --git a/src/acpi/aml/namedobj.rs b/src/acpi/aml/namedobj.rs
index 1d16d2b..47a8e43 100644
--- a/src/acpi/aml/namedobj.rs
+++ b/src/acpi/aml/namedobj.rs
@@ -377,7 +377,8 @@ fn parse_def_data_region(data: &[u8],
         accessor: Accessor {
             read: |x| 0 as u64,
             write: |x, y| ()
-        }
+        },
+        accessed_by: None
     });
 
     Ok(AmlParseType {
@@ -477,7 +478,8 @@ fn parse_def_op_region(data: &[u8],
         accessor: Accessor {
             read: |x| 0 as u64,
             write: |x, y| ()
-        }
+        },
+        accessed_by: None
     });
 
     Ok(AmlParseType {
@@ -819,7 +821,7 @@ fn parse_def_mutex(data: &[u8],
     let sync_level = flags & 0x0F;
     
     let local_scope_string = get_namespace_string(ctx.scope.clone(), name.val);
-    ctx.add_to_namespace(local_scope_string, AmlValue::Mutex(sync_level));
+    ctx.add_to_namespace(local_scope_string, AmlValue::Mutex((sync_level, None)));
 
     Ok(AmlParseType {
         val: AmlValue::None,
diff --git a/src/acpi/aml/namespace.rs b/src/acpi/aml/namespace.rs
index ac3f585..ddead79 100644
--- a/src/acpi/aml/namespace.rs
+++ b/src/acpi/aml/namespace.rs
@@ -79,13 +79,14 @@ pub enum AmlValue {
     Integer(u64),
     IntegerConstant(u64),
     Method(Method),
-    Mutex(u8),
+    Mutex((u8, Option<u64>)),
     ObjectReference(ObjectReference),
     OperationRegion {
         region: RegionSpace,
         offset: Box<AmlValue>,
         len: Box<AmlValue>,
-        accessor: Accessor
+        accessor: Accessor,
+        accessed_by: Option<u64>
     },
     Package(Vec<AmlValue>),
     String(String),
diff --git a/src/acpi/aml/parser.rs b/src/acpi/aml/parser.rs
index e31c6f7..a762eba 100644
--- a/src/acpi/aml/parser.rs
+++ b/src/acpi/aml/parser.rs
@@ -2,6 +2,8 @@ use collections::string::String;
 use collections::btree_map::BTreeMap;
 use collections::vec::Vec;
 
+use spin::RwLockWriteGuard;
+
 use super::namespace::{ AmlValue, ObjectReference };
 use super::AmlError;
 
@@ -101,6 +103,10 @@ impl AmlExecutionContext {
         }
     }
 
+    pub fn prelock(&mut self) -> RwLockWriteGuard<'static, Option<BTreeMap<String, AmlValue>>> {
+        ACPI_TABLE.namespace.write()
+    }
+
     pub fn modify(&mut self, name: AmlValue, value: AmlValue) {
         // TODO: throw errors
         // TODO: return DRO
diff --git a/src/acpi/aml/type2opcode.rs b/src/acpi/aml/type2opcode.rs
index c505201..c91b3bd 100644
--- a/src/acpi/aml/type2opcode.rs
+++ b/src/acpi/aml/type2opcode.rs
@@ -307,17 +307,70 @@ fn parse_def_acquire(data: &[u8],
         })
     }
     
-    // TODO: Store the result
-    // TODO: Perform computation
     parser_opcode_extended!(data, 0x23);
 
     let obj = parse_super_name(&data[1..], ctx)?;
     let timeout = (data[2 + obj.len] as u16) + ((data[3 + obj.len] as u16) << 8);
+
+    let (seconds, nanoseconds) = monotonic();
+    let starting_time_ns = nanoseconds + (seconds * 1000000000);
+
+    let id = ctx.ctx_id;
+
+    loop {
+        {
+            let mut namespace = ctx.prelock();
+            let mutex = ctx.get(obj.val.clone());
+
+            match mutex {
+                AmlValue::Mutex((sync_level, owner)) => {
+                    if owner == None {
+                        ctx.modify(obj.val.clone(), AmlValue::Mutex((sync_level, Some(id))));
+                        return Ok(AmlParseType {
+                            val: AmlValue::Integer(0),
+                            len: 4 + obj.len
+                        });
+                    }
+                },
+                AmlValue::OperationRegion { region, offset, len, accessor, accessed_by } => {
+                    if accessed_by == None {
+                        ctx.modify(obj.val.clone(), AmlValue::OperationRegion {
+                            region,
+                            offset,
+                            len,
+                            accessor,
+                            accessed_by: Some(id)
+                        });
+                        return Ok(AmlParseType {
+                            val: AmlValue::Integer(0),
+                            len: 4 + obj.len
+                        });
+                    }
+                },
+                _ => return Err(AmlError::AmlValueError)
+            }
+        }
+
+        if timeout == 0xFFFF {
+            // TODO: Brief sleep here
+        } else {
+            let (seconds, nanoseconds) = monotonic();
+            let current_time_ns = nanoseconds + (seconds * 1000000000);
+            
+            if current_time_ns - starting_time_ns > timeout as u64 * 1000000 {
+                return Ok(AmlParseType {
+                    val: AmlValue::Integer(1),
+                    len: 4 + obj.len
+                });
+            }
+        }
+    }
     
     Ok(AmlParseType {
         val: AmlValue::Uninitialized,
         len: 4 + obj.len
     })
+        // This should never run
 }
 
 fn parse_def_increment(data: &[u8],
@@ -333,8 +386,9 @@ fn parse_def_increment(data: &[u8],
     parser_opcode!(data, 0x75);
 
     let obj = parse_super_name(&data[1..], ctx)?;
+    
+    let mut namespace = ctx.prelock();
     let value = AmlValue::Integer(ctx.get(obj.val.clone()).get_as_integer()? + 1);
-
     ctx.modify(obj.val, value.clone());
     
     Ok(AmlParseType {