diff --git a/cli/compilers/ts.rs b/cli/compilers/ts.rs
index ff5405f52f1c3e9acbb6818b39a48f5fe195b4fc..0e3e0b95dd2889842c3e745c5bd7a0090ecbf35a 100644
--- a/cli/compilers/ts.rs
+++ b/cli/compilers/ts.rs
@@ -229,7 +229,7 @@ impl TsCompiler {
   fn setup_worker(global_state: ThreadSafeGlobalState) -> Worker {
     let (int, ext) = ThreadSafeState::create_channels();
     let worker_state =
-      ThreadSafeState::new(global_state.clone(), None, true, int)
+      ThreadSafeState::new(global_state.clone(), None, None, true, int)
         .expect("Unable to create worker state");
 
     // Count how many times we start the compiler worker.
diff --git a/cli/compilers/wasm.rs b/cli/compilers/wasm.rs
index 2e565dd93b96f8b2ab1fcdc71214163f594757d3..22ec6526c9444d3b09c2578166f5e8bd16ff1c26 100644
--- a/cli/compilers/wasm.rs
+++ b/cli/compilers/wasm.rs
@@ -47,7 +47,7 @@ impl WasmCompiler {
   fn setup_worker(global_state: ThreadSafeGlobalState) -> Worker {
     let (int, ext) = ThreadSafeState::create_channels();
     let worker_state =
-      ThreadSafeState::new(global_state.clone(), None, true, int)
+      ThreadSafeState::new(global_state.clone(), None, None, true, int)
         .expect("Unable to create worker state");
 
     // Count how many times we start the compiler worker.
diff --git a/cli/lib.rs b/cli/lib.rs
index 100b25867025c6b084c674fa1a0ade1a2c761893..df9c3db54cca1c35c37c1211991caeb314b52a3b 100644
--- a/cli/lib.rs
+++ b/cli/lib.rs
@@ -118,6 +118,7 @@ fn create_worker_and_state(
   let (int, ext) = ThreadSafeState::create_channels();
   let state = ThreadSafeState::new(
     global_state.clone(),
+    None,
     global_state.main_module.clone(),
     true,
     int,
diff --git a/cli/ops/permissions.rs b/cli/ops/permissions.rs
index 0f40b642c266dd7e3f3bfaf7d04e784c05c1f873..bd8340bf0cbedc797c573228a44f71794bfd0947 100644
--- a/cli/ops/permissions.rs
+++ b/cli/ops/permissions.rs
@@ -33,7 +33,8 @@ pub fn op_query_permission(
   _zero_copy: Option<PinnedBuf>,
 ) -> Result<JsonOp, ErrBox> {
   let args: PermissionArgs = serde_json::from_value(args)?;
-  let perm = state.permissions.get_permission_state(
+  let permissions = state.permissions.lock().unwrap();
+  let perm = permissions.get_permission_state(
     &args.name,
     &args.url.as_ref().map(String::as_str),
     &args.path.as_ref().map(String::as_str),
@@ -47,16 +48,17 @@ pub fn op_revoke_permission(
   _zero_copy: Option<PinnedBuf>,
 ) -> Result<JsonOp, ErrBox> {
   let args: PermissionArgs = serde_json::from_value(args)?;
+  let mut permissions = state.permissions.lock().unwrap();
   match args.name.as_ref() {
-    "run" => state.permissions.allow_run.revoke(),
-    "read" => state.permissions.allow_read.revoke(),
-    "write" => state.permissions.allow_write.revoke(),
-    "net" => state.permissions.allow_net.revoke(),
-    "env" => state.permissions.allow_env.revoke(),
-    "hrtime" => state.permissions.allow_hrtime.revoke(),
+    "run" => permissions.allow_run.revoke(),
+    "read" => permissions.allow_read.revoke(),
+    "write" => permissions.allow_write.revoke(),
+    "net" => permissions.allow_net.revoke(),
+    "env" => permissions.allow_env.revoke(),
+    "hrtime" => permissions.allow_hrtime.revoke(),
     _ => {}
   };
-  let perm = state.permissions.get_permission_state(
+  let perm = permissions.get_permission_state(
     &args.name,
     &args.url.as_ref().map(String::as_str),
     &args.path.as_ref().map(String::as_str),
@@ -70,23 +72,18 @@ pub fn op_request_permission(
   _zero_copy: Option<PinnedBuf>,
 ) -> Result<JsonOp, ErrBox> {
   let args: PermissionArgs = serde_json::from_value(args)?;
+  let mut permissions = state.permissions.lock().unwrap();
   let perm = match args.name.as_ref() {
-    "run" => Ok(state.permissions.request_run()),
-    "read" => Ok(
-      state
-        .permissions
-        .request_read(&args.path.as_ref().map(String::as_str)),
-    ),
-    "write" => Ok(
-      state
-        .permissions
-        .request_write(&args.path.as_ref().map(String::as_str)),
-    ),
-    "net" => state
-      .permissions
-      .request_net(&args.url.as_ref().map(String::as_str)),
-    "env" => Ok(state.permissions.request_env()),
-    "hrtime" => Ok(state.permissions.request_hrtime()),
+    "run" => Ok(permissions.request_run()),
+    "read" => {
+      Ok(permissions.request_read(&args.path.as_ref().map(String::as_str)))
+    }
+    "write" => {
+      Ok(permissions.request_write(&args.path.as_ref().map(String::as_str)))
+    }
+    "net" => permissions.request_net(&args.url.as_ref().map(String::as_str)),
+    "env" => Ok(permissions.request_env()),
+    "hrtime" => Ok(permissions.request_hrtime()),
     n => Err(type_error(format!("No such permission name: {}", n))),
   }?;
   Ok(JsonOp::Sync(json!({ "state": perm.to_string() })))
diff --git a/cli/ops/timers.rs b/cli/ops/timers.rs
index 7223633f8783cdab15c28f540e06813c1300d857..21d1eda24801c770b8670bf9a536c13b9b1bda05 100644
--- a/cli/ops/timers.rs
+++ b/cli/ops/timers.rs
@@ -66,11 +66,12 @@ fn op_now(
   let seconds = state.start_time.elapsed().as_secs();
   let mut subsec_nanos = state.start_time.elapsed().subsec_nanos();
   let reduced_time_precision = 2_000_000; // 2ms in nanoseconds
+  let permissions = state.permissions.lock().unwrap();
 
   // If the permission is not enabled
   // Round the nano result on 2 milliseconds
   // see: https://developer.mozilla.org/en-US/docs/Web/API/DOMHighResTimeStamp#Reduced_time_precision
-  if !state.permissions.allow_hrtime.is_allow() {
+  if !permissions.allow_hrtime.is_allow() {
     subsec_nanos -= subsec_nanos % reduced_time_precision
   }
 
diff --git a/cli/ops/workers.rs b/cli/ops/workers.rs
index a0329054592074305ebb8aef855e2bfab8392a2b..4bde38222721781bf3e9721367ab10ae54613264 100644
--- a/cli/ops/workers.rs
+++ b/cli/ops/workers.rs
@@ -142,10 +142,13 @@ fn op_create_worker(
   let (int, ext) = ThreadSafeState::create_channels();
   let child_state = ThreadSafeState::new(
     state.global_state.clone(),
+    Some(parent_state.permissions.clone()), // by default share with parent
     Some(module_specifier.clone()),
     include_deno_namespace,
     int,
   )?;
+  // TODO: add a new option to make child worker not sharing permissions
+  // with parent (aka .clone(), requests from child won't reflect in parent)
   let name = format!("USER-WORKER-{}", specifier);
   let deno_main_call = format!("denoMain({})", include_deno_namespace);
   let mut worker =
diff --git a/cli/permissions.rs b/cli/permissions.rs
index fe0a7d473c89acf8bb111a698dd056e6b938cbdf..37d6dd3cab61df3e44d98f82b1b108cf19865f89 100644
--- a/cli/permissions.rs
+++ b/cli/permissions.rs
@@ -13,166 +13,131 @@ use std::io;
 use std::path::PathBuf;
 #[cfg(test)]
 use std::sync::atomic::AtomicBool;
-use std::sync::atomic::{AtomicUsize, Ordering};
-use std::sync::Arc;
+#[cfg(test)]
+use std::sync::atomic::Ordering;
 use url::Url;
 
 const PERMISSION_EMOJI: &str = "⚠️";
 
 /// Tri-state value for storing permission state
-#[derive(PartialEq, Debug)]
-pub enum PermissionAccessorState {
+#[derive(PartialEq, Debug, Clone, Copy)]
+pub enum PermissionState {
   Allow = 0,
   Ask = 1,
   Deny = 2,
 }
 
-impl PermissionAccessorState {
+impl PermissionState {
   /// Checks the permission state and returns the result.
   pub fn check(self, msg: &str, err_msg: &str) -> Result<(), ErrBox> {
-    if self == PermissionAccessorState::Allow {
+    if self == PermissionState::Allow {
       log_perm_access(msg);
       return Ok(());
     }
     Err(permission_denied_msg(err_msg.to_string()))
   }
+  pub fn is_allow(self) -> bool {
+    self == PermissionState::Allow
+  }
+  /// If the state is "Allow" walk it back to the default "Ask"
+  /// Don't do anything if state is "Deny"
+  pub fn revoke(&mut self) {
+    if *self == PermissionState::Allow {
+      *self = PermissionState::Ask;
+    }
+  }
+  /// Requests the permission.
+  pub fn request(&mut self, msg: &str) -> PermissionState {
+    if *self != PermissionState::Ask {
+      return *self;
+    }
+    if permission_prompt(msg) {
+      *self = PermissionState::Allow;
+    } else {
+      *self = PermissionState::Deny;
+    }
+    *self
+  }
 }
 
-impl From<usize> for PermissionAccessorState {
+impl From<usize> for PermissionState {
   fn from(val: usize) -> Self {
     match val {
-      0 => PermissionAccessorState::Allow,
-      1 => PermissionAccessorState::Ask,
-      2 => PermissionAccessorState::Deny,
+      0 => PermissionState::Allow,
+      1 => PermissionState::Ask,
+      2 => PermissionState::Deny,
       _ => unreachable!(),
     }
   }
 }
 
-impl From<bool> for PermissionAccessorState {
+impl From<bool> for PermissionState {
   fn from(val: bool) -> Self {
     if val {
-      PermissionAccessorState::Allow
+      PermissionState::Allow
     } else {
-      PermissionAccessorState::Ask
+      PermissionState::Ask
     }
   }
 }
 
-impl fmt::Display for PermissionAccessorState {
+impl fmt::Display for PermissionState {
   fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
     match self {
-      PermissionAccessorState::Allow => f.pad("granted"),
-      PermissionAccessorState::Ask => f.pad("prompt"),
-      PermissionAccessorState::Deny => f.pad("denied"),
+      PermissionState::Allow => f.pad("granted"),
+      PermissionState::Ask => f.pad("prompt"),
+      PermissionState::Deny => f.pad("denied"),
     }
   }
 }
 
-#[derive(Clone, Debug)]
-pub struct PermissionAccessor {
-  state: Arc<AtomicUsize>,
-}
-
-impl PermissionAccessor {
-  pub fn new(state: PermissionAccessorState) -> Self {
-    Self {
-      state: Arc::new(AtomicUsize::new(state as usize)),
-    }
-  }
-
-  /// If the state is "Allow" walk it back to the default "Ask"
-  /// Don't do anything if state is "Deny"
-  pub fn revoke(&self) {
-    if self.is_allow() {
-      self.set_state(PermissionAccessorState::Ask)
-    }
-  }
-
-  /// Requests the permission.
-  pub fn request(&self, msg: &str) -> PermissionAccessorState {
-    let state = self.get_state();
-    if state != PermissionAccessorState::Ask {
-      return state;
-    }
-    self.set_state(if permission_prompt(msg) {
-      PermissionAccessorState::Allow
-    } else {
-      PermissionAccessorState::Deny
-    });
-    self.get_state()
-  }
-
-  pub fn is_allow(&self) -> bool {
-    self.get_state() == PermissionAccessorState::Allow
-  }
-
-  #[inline]
-  pub fn get_state(&self) -> PermissionAccessorState {
-    self.state.load(Ordering::SeqCst).into()
-  }
-  fn set_state(&self, state: PermissionAccessorState) {
-    self.state.store(state as usize, Ordering::SeqCst)
-  }
-}
-
-impl From<bool> for PermissionAccessor {
-  fn from(val: bool) -> Self {
-    Self::new(PermissionAccessorState::from(val))
-  }
-}
-
-impl Default for PermissionAccessor {
+impl Default for PermissionState {
   fn default() -> Self {
-    Self {
-      state: Arc::new(AtomicUsize::new(PermissionAccessorState::Ask as usize)),
-    }
+    PermissionState::Ask
   }
 }
 
 #[derive(Clone, Debug, Default)]
 pub struct DenoPermissions {
   // Keep in sync with cli/js/permissions.ts
-  pub allow_read: PermissionAccessor,
-  pub read_whitelist: Arc<HashSet<String>>,
-  pub allow_write: PermissionAccessor,
-  pub write_whitelist: Arc<HashSet<String>>,
-  pub allow_net: PermissionAccessor,
-  pub net_whitelist: Arc<HashSet<String>>,
-  pub allow_env: PermissionAccessor,
-  pub allow_run: PermissionAccessor,
-  pub allow_hrtime: PermissionAccessor,
+  pub allow_read: PermissionState,
+  pub read_whitelist: HashSet<String>,
+  pub allow_write: PermissionState,
+  pub write_whitelist: HashSet<String>,
+  pub allow_net: PermissionState,
+  pub net_whitelist: HashSet<String>,
+  pub allow_env: PermissionState,
+  pub allow_run: PermissionState,
+  pub allow_hrtime: PermissionState,
 }
 
 impl DenoPermissions {
   pub fn from_flags(flags: &DenoFlags) -> Self {
     Self {
-      allow_read: PermissionAccessor::from(flags.allow_read),
-      read_whitelist: Arc::new(flags.read_whitelist.iter().cloned().collect()),
-      allow_write: PermissionAccessor::from(flags.allow_write),
-      write_whitelist: Arc::new(
-        flags.write_whitelist.iter().cloned().collect(),
-      ),
-      allow_net: PermissionAccessor::from(flags.allow_net),
-      net_whitelist: Arc::new(flags.net_whitelist.iter().cloned().collect()),
-      allow_env: PermissionAccessor::from(flags.allow_env),
-      allow_run: PermissionAccessor::from(flags.allow_run),
-      allow_hrtime: PermissionAccessor::from(flags.allow_hrtime),
+      allow_read: PermissionState::from(flags.allow_read),
+      read_whitelist: flags.read_whitelist.iter().cloned().collect(),
+      allow_write: PermissionState::from(flags.allow_write),
+      write_whitelist: flags.write_whitelist.iter().cloned().collect(),
+      allow_net: PermissionState::from(flags.allow_net),
+      net_whitelist: flags.net_whitelist.iter().cloned().collect(),
+      allow_env: PermissionState::from(flags.allow_env),
+      allow_run: PermissionState::from(flags.allow_run),
+      allow_hrtime: PermissionState::from(flags.allow_hrtime),
     }
   }
 
   pub fn check_run(&self) -> Result<(), ErrBox> {
-    self.allow_run.get_state().check(
+    self.allow_run.check(
       "access to run a subprocess",
       "run again with the --allow-run flag",
     )
   }
 
-  fn get_state_read(&self, filename: &Option<&str>) -> PermissionAccessorState {
+  fn get_state_read(&self, filename: &Option<&str>) -> PermissionState {
     if check_path_white_list(filename, &self.read_whitelist) {
-      return PermissionAccessorState::Allow;
+      return PermissionState::Allow;
     }
-    self.allow_read.get_state()
+    self.allow_read
   }
 
   pub fn check_read(&self, filename: &str) -> Result<(), ErrBox> {
@@ -182,14 +147,11 @@ impl DenoPermissions {
     )
   }
 
-  fn get_state_write(
-    &self,
-    filename: &Option<&str>,
-  ) -> PermissionAccessorState {
+  fn get_state_write(&self, filename: &Option<&str>) -> PermissionState {
     if check_path_white_list(filename, &self.write_whitelist) {
-      return PermissionAccessorState::Allow;
+      return PermissionState::Allow;
     }
-    self.allow_write.get_state()
+    self.allow_write
   }
 
   pub fn check_write(&self, filename: &str) -> Result<(), ErrBox> {
@@ -199,23 +161,19 @@ impl DenoPermissions {
     )
   }
 
-  fn get_state_net(
-    &self,
-    host: &str,
-    port: Option<u16>,
-  ) -> PermissionAccessorState {
+  fn get_state_net(&self, host: &str, port: Option<u16>) -> PermissionState {
     if check_host_and_port_whitelist(host, port, &self.net_whitelist) {
-      return PermissionAccessorState::Allow;
+      return PermissionState::Allow;
     }
-    self.allow_net.get_state()
+    self.allow_net
   }
 
   fn get_state_net_url(
     &self,
     url: &Option<&str>,
-  ) -> Result<PermissionAccessorState, ErrBox> {
+  ) -> Result<PermissionState, ErrBox> {
     if url.is_none() {
-      return Ok(self.allow_net.get_state());
+      return Ok(self.allow_net);
     }
     let url: &str = url.unwrap();
     // If url is invalid, then throw a TypeError.
@@ -243,21 +201,21 @@ impl DenoPermissions {
   }
 
   pub fn check_env(&self) -> Result<(), ErrBox> {
-    self.allow_env.get_state().check(
+    self.allow_env.check(
       "access to environment variables",
       "run again with the --allow-env flag",
     )
   }
 
-  pub fn request_run(&self) -> PermissionAccessorState {
+  pub fn request_run(&mut self) -> PermissionState {
     self
       .allow_run
       .request("Deno requests to access to run a subprocess.")
   }
 
-  pub fn request_read(&self, path: &Option<&str>) -> PermissionAccessorState {
+  pub fn request_read(&mut self, path: &Option<&str>) -> PermissionState {
     if check_path_white_list(path, &self.read_whitelist) {
-      return PermissionAccessorState::Allow;
+      return PermissionState::Allow;
     };
     self.allow_write.request(&match path {
       None => "Deno requests read access.".to_string(),
@@ -265,9 +223,9 @@ impl DenoPermissions {
     })
   }
 
-  pub fn request_write(&self, path: &Option<&str>) -> PermissionAccessorState {
+  pub fn request_write(&mut self, path: &Option<&str>) -> PermissionState {
     if check_path_white_list(path, &self.write_whitelist) {
-      return PermissionAccessorState::Allow;
+      return PermissionState::Allow;
     };
     self.allow_write.request(&match path {
       None => "Deno requests write access.".to_string(),
@@ -276,10 +234,10 @@ impl DenoPermissions {
   }
 
   pub fn request_net(
-    &self,
+    &mut self,
     url: &Option<&str>,
-  ) -> Result<PermissionAccessorState, ErrBox> {
-    if self.get_state_net_url(url)? == PermissionAccessorState::Ask {
+  ) -> Result<PermissionState, ErrBox> {
+    if self.get_state_net_url(url)? == PermissionState::Ask {
       return Ok(self.allow_run.request(&match url {
         None => "Deno requests network access.".to_string(),
         Some(url) => format!("Deno requests network access to \"{}\".", url),
@@ -288,13 +246,13 @@ impl DenoPermissions {
     self.get_state_net_url(url)
   }
 
-  pub fn request_env(&self) -> PermissionAccessorState {
+  pub fn request_env(&mut self) -> PermissionState {
     self
       .allow_env
       .request("Deno requests to access to environment variables.")
   }
 
-  pub fn request_hrtime(&self) -> PermissionAccessorState {
+  pub fn request_hrtime(&mut self) -> PermissionState {
     self
       .allow_hrtime
       .request("Deno requests to access to high precision time.")
@@ -305,14 +263,14 @@ impl DenoPermissions {
     name: &str,
     url: &Option<&str>,
     path: &Option<&str>,
-  ) -> Result<PermissionAccessorState, ErrBox> {
+  ) -> Result<PermissionState, ErrBox> {
     match name {
-      "run" => Ok(self.allow_run.get_state()),
+      "run" => Ok(self.allow_run),
       "read" => Ok(self.get_state_read(path)),
       "write" => Ok(self.get_state_write(path)),
       "net" => self.get_state_net_url(url),
-      "env" => Ok(self.allow_env.get_state()),
-      "hrtime" => Ok(self.allow_hrtime.get_state()),
+      "env" => Ok(self.allow_env),
+      "hrtime" => Ok(self.allow_hrtime),
       n => Err(type_error(format!("No such permission name: {}", n))),
     }
   }
@@ -380,7 +338,7 @@ fn log_perm_access(message: &str) {
 
 fn check_path_white_list(
   filename: &Option<&str>,
-  white_list: &Arc<HashSet<String>>,
+  white_list: &HashSet<String>,
 ) -> bool {
   if filename.is_none() {
     return false;
@@ -400,7 +358,7 @@ fn check_path_white_list(
 fn check_host_and_port_whitelist(
   host: &str,
   port: Option<u16>,
-  whitelist: &Arc<HashSet<String>>,
+  whitelist: &HashSet<String>,
 ) -> bool {
   whitelist.contains(host)
     || (port.is_some()
@@ -544,23 +502,23 @@ mod tests {
 
   #[test]
   fn test_permissions_request_run() {
-    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms0 = DenoPermissions::from_flags(&DenoFlags {
       ..Default::default()
     });
     set_prompt_result(true);
-    assert_eq!(perms0.request_run(), PermissionAccessorState::Allow);
+    assert_eq!(perms0.request_run(), PermissionState::Allow);
 
-    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms1 = DenoPermissions::from_flags(&DenoFlags {
       ..Default::default()
     });
     set_prompt_result(false);
-    assert_eq!(perms1.request_run(), PermissionAccessorState::Deny);
+    assert_eq!(perms1.request_run(), PermissionState::Deny);
   }
 
   #[test]
   fn test_permissions_request_read() {
     let whitelist = svec!["/foo/bar"];
-    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms0 = DenoPermissions::from_flags(&DenoFlags {
       read_whitelist: whitelist.clone(),
       ..Default::default()
     });
@@ -569,34 +527,34 @@ mod tests {
     // regardless of prompt result
     assert_eq!(
       perms0.request_read(&Some("/foo/bar")),
-      PermissionAccessorState::Allow
+      PermissionState::Allow
     );
 
-    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms1 = DenoPermissions::from_flags(&DenoFlags {
       read_whitelist: whitelist.clone(),
       ..Default::default()
     });
     set_prompt_result(true);
     assert_eq!(
       perms1.request_read(&Some("/foo/baz")),
-      PermissionAccessorState::Allow
+      PermissionState::Allow
     );
 
-    let perms2 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms2 = DenoPermissions::from_flags(&DenoFlags {
       read_whitelist: whitelist.clone(),
       ..Default::default()
     });
     set_prompt_result(false);
     assert_eq!(
       perms2.request_read(&Some("/foo/baz")),
-      PermissionAccessorState::Deny
+      PermissionState::Deny
     );
   }
 
   #[test]
   fn test_permissions_request_write() {
     let whitelist = svec!["/foo/bar"];
-    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms0 = DenoPermissions::from_flags(&DenoFlags {
       write_whitelist: whitelist.clone(),
       ..Default::default()
     });
@@ -605,27 +563,27 @@ mod tests {
     // regardless of prompt result
     assert_eq!(
       perms0.request_write(&Some("/foo/bar")),
-      PermissionAccessorState::Allow
+      PermissionState::Allow
     );
 
-    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms1 = DenoPermissions::from_flags(&DenoFlags {
       write_whitelist: whitelist.clone(),
       ..Default::default()
     });
     set_prompt_result(true);
     assert_eq!(
       perms1.request_write(&Some("/foo/baz")),
-      PermissionAccessorState::Allow
+      PermissionState::Allow
     );
 
-    let perms2 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms2 = DenoPermissions::from_flags(&DenoFlags {
       write_whitelist: whitelist.clone(),
       ..Default::default()
     });
     set_prompt_result(false);
     assert_eq!(
       perms2.request_write(&Some("/foo/baz")),
-      PermissionAccessorState::Deny
+      PermissionState::Deny
     );
   }
 
@@ -633,7 +591,7 @@ mod tests {
   fn test_permission_request_net() {
     let whitelist = svec!["localhost:8080"];
 
-    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms0 = DenoPermissions::from_flags(&DenoFlags {
       net_whitelist: whitelist.clone(),
       ..Default::default()
     });
@@ -644,10 +602,10 @@ mod tests {
       perms0
         .request_net(&Some("http://localhost:8080/"))
         .expect("Testing expect"),
-      PermissionAccessorState::Allow
+      PermissionState::Allow
     );
 
-    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms1 = DenoPermissions::from_flags(&DenoFlags {
       net_whitelist: whitelist.clone(),
       ..Default::default()
     });
@@ -656,10 +614,10 @@ mod tests {
       perms1
         .request_net(&Some("http://deno.land/"))
         .expect("Testing expect"),
-      PermissionAccessorState::Allow
+      PermissionState::Allow
     );
 
-    let perms2 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms2 = DenoPermissions::from_flags(&DenoFlags {
       net_whitelist: whitelist.clone(),
       ..Default::default()
     });
@@ -668,10 +626,10 @@ mod tests {
       perms2
         .request_net(&Some("http://deno.land/"))
         .expect("Testing expect"),
-      PermissionAccessorState::Deny
+      PermissionState::Deny
     );
 
-    let perms3 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms3 = DenoPermissions::from_flags(&DenoFlags {
       net_whitelist: whitelist.clone(),
       ..Default::default()
     });
@@ -681,31 +639,31 @@ mod tests {
 
   #[test]
   fn test_permissions_request_env() {
-    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms0 = DenoPermissions::from_flags(&DenoFlags {
       ..Default::default()
     });
     set_prompt_result(true);
-    assert_eq!(perms0.request_env(), PermissionAccessorState::Allow);
+    assert_eq!(perms0.request_env(), PermissionState::Allow);
 
-    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms1 = DenoPermissions::from_flags(&DenoFlags {
       ..Default::default()
     });
     set_prompt_result(false);
-    assert_eq!(perms1.request_env(), PermissionAccessorState::Deny);
+    assert_eq!(perms1.request_env(), PermissionState::Deny);
   }
 
   #[test]
   fn test_permissions_request_hrtime() {
-    let perms0 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms0 = DenoPermissions::from_flags(&DenoFlags {
       ..Default::default()
     });
     set_prompt_result(true);
-    assert_eq!(perms0.request_hrtime(), PermissionAccessorState::Allow);
+    assert_eq!(perms0.request_hrtime(), PermissionState::Allow);
 
-    let perms1 = DenoPermissions::from_flags(&DenoFlags {
+    let mut perms1 = DenoPermissions::from_flags(&DenoFlags {
       ..Default::default()
     });
     set_prompt_result(false);
-    assert_eq!(perms1.request_hrtime(), PermissionAccessorState::Deny);
+    assert_eq!(perms1.request_hrtime(), PermissionState::Deny);
   }
 }
diff --git a/cli/state.rs b/cli/state.rs
index 245919e7f000c725cd4782d6b558c195761d878e..5ce4328937672c2cd0c28d8929946eeaf8897a38 100644
--- a/cli/state.rs
+++ b/cli/state.rs
@@ -44,7 +44,7 @@ pub struct ThreadSafeState(Arc<State>);
 pub struct State {
   pub global_state: ThreadSafeGlobalState,
   pub modules: Arc<Mutex<deno::Modules>>,
-  pub permissions: DenoPermissions,
+  pub permissions: Arc<Mutex<DenoPermissions>>,
   pub main_module: Option<ModuleSpecifier>,
   pub worker_channels: Mutex<WorkerChannels>,
   /// When flags contains a `.import_map_path` option, the content of the
@@ -213,6 +213,8 @@ impl ThreadSafeState {
 
   pub fn new(
     global_state: ThreadSafeGlobalState,
+    // If Some(perm), use perm. Else copy from global_state.
+    shared_permissions: Option<Arc<Mutex<DenoPermissions>>>,
     main_module: Option<ModuleSpecifier>,
     include_deno_namespace: bool,
     internal_channels: WorkerChannels,
@@ -229,7 +231,11 @@ impl ThreadSafeState {
     };
 
     let modules = Arc::new(Mutex::new(deno::Modules::new()));
-    let permissions = global_state.permissions.clone();
+    let permissions = if let Some(perm) = shared_permissions {
+      perm
+    } else {
+      Arc::new(Mutex::new(global_state.permissions.clone()))
+    };
 
     let state = State {
       global_state,
@@ -260,32 +266,32 @@ impl ThreadSafeState {
 
   #[inline]
   pub fn check_read(&self, filename: &str) -> Result<(), ErrBox> {
-    self.permissions.check_read(filename)
+    self.permissions.lock().unwrap().check_read(filename)
   }
 
   #[inline]
   pub fn check_write(&self, filename: &str) -> Result<(), ErrBox> {
-    self.permissions.check_write(filename)
+    self.permissions.lock().unwrap().check_write(filename)
   }
 
   #[inline]
   pub fn check_env(&self) -> Result<(), ErrBox> {
-    self.permissions.check_env()
+    self.permissions.lock().unwrap().check_env()
   }
 
   #[inline]
   pub fn check_net(&self, hostname: &str, port: u16) -> Result<(), ErrBox> {
-    self.permissions.check_net(hostname, port)
+    self.permissions.lock().unwrap().check_net(hostname, port)
   }
 
   #[inline]
   pub fn check_net_url(&self, url: &url::Url) -> Result<(), ErrBox> {
-    self.permissions.check_net_url(url)
+    self.permissions.lock().unwrap().check_net_url(url)
   }
 
   #[inline]
   pub fn check_run(&self) -> Result<(), ErrBox> {
-    self.permissions.check_run()
+    self.permissions.lock().unwrap().check_run()
   }
 
   pub fn check_dyn_import(
@@ -327,6 +333,7 @@ impl ThreadSafeState {
 
     ThreadSafeState::new(
       ThreadSafeGlobalState::mock(argv),
+      None,
       module_specifier,
       true,
       internal_channels,
diff --git a/cli/worker.rs b/cli/worker.rs
index b9802d581df0cd15d80ecb40fc8d04cdbfca2441..5a3bc7efa56d638da53fc81a5d0d36db275ae6d2 100644
--- a/cli/worker.rs
+++ b/cli/worker.rs
@@ -248,6 +248,7 @@ mod tests {
     let (int, ext) = ThreadSafeState::create_channels();
     let state = ThreadSafeState::new(
       global_state,
+      None,
       Some(module_specifier.clone()),
       true,
       int,
@@ -288,6 +289,7 @@ mod tests {
     let (int, ext) = ThreadSafeState::create_channels();
     let state = ThreadSafeState::new(
       global_state,
+      None,
       Some(module_specifier.clone()),
       true,
       int,
@@ -331,6 +333,7 @@ mod tests {
     let (int, ext) = ThreadSafeState::create_channels();
     let state = ThreadSafeState::new(
       global_state.clone(),
+      None,
       Some(module_specifier.clone()),
       true,
       int,