chore: add feature single-thread

Cargo.toml

@@ -70,6 +70,7 @@ full-repl = ["erg_common/full-repl"]
 full = ["els", "full-repl", "unicode", "pretty"]
 experimental = ["erg_common/experimental", "erg_parser/experimental", "erg_compiler/experimental", "erg_linter/experimental"]
 log-level-error = ["erg_common/log-level-error", "erg_parser/log-level-error", "erg_compiler/log-level-error", "erg_linter/log-level-error"]
+single-thread = ["erg_common/single-thread", "erg_parser/single-thread", "erg_compiler/single-thread", "erg_linter/single-thread"]
 
 [workspace.dependencies]
 erg_common = { version = "0.6.43", path = "./crates/erg_common" }

crates/erg_common/Cargo.toml

@@ -26,6 +26,7 @@ full-repl = ["dep:crossterm"]
 experimental = []
 pylib = ["dep:pyo3"]
 log-level-error = []
+single-thread = []
 
 [target.'cfg(unix)'.dependencies]
 backtrace-on-stack-overflow = { version = "0.3.0", optional = true }

crates/erg_common/consts.rs

@@ -11,3 +11,4 @@ pub const LOG_LEVEL_ERROR: bool = cfg!(feature = "log-level-error");
 pub const EXPERIMENTAL_MODE: bool = cfg!(feature = "experimental");
 pub const BACKTRACE_MODE: bool = cfg!(feature = "backtrace");
 pub const GAL: bool = cfg!(feature = "gal");
+pub const SINGLE_THREAD: bool = cfg!(feature = "single-thread");

crates/erg_compiler/Cargo.toml

@@ -43,6 +43,7 @@ experimental = ["erg_common/experimental", "erg_parser/experimental"]
 pylib = ["dep:pyo3", "erg_common/pylib", "erg_parser/pylib"]
 pylib_compiler = ["pylib"]
 log-level-error = ["erg_common/log-level-error", "erg_parser/log-level-error"]
+single-thread = ["erg_common/single-thread", "erg_parser/single-thread"]
 
 [dependencies]
 erg_common = { workspace = true }

crates/erg_compiler/build_package.rs

@@ -13,7 +13,7 @@ use std::time::{Duration, SystemTime};
 use erg_common::config::ErgMode;
 
 use erg_common::config::ErgConfig;
-use erg_common::consts::{ELS, ERG_MODE};
+use erg_common::consts::{ELS, ERG_MODE, SINGLE_THREAD};
 use erg_common::debug_power_assert;
 use erg_common::dict::Dict;
 use erg_common::env::is_std_decl_path;
@@ -943,8 +943,13 @@ impl<ASTBuilder: ASTBuildable, HIRBuilder: Buildable>
                 }
             }
         };
-        let handle = spawn_new_thread(run, &__name__);
-        self.shared.promises.insert(path, handle);
+        if SINGLE_THREAD {
+            run();
+            self.shared.promises.mark_as_joined(path);
+        } else {
+            let handle = spawn_new_thread(run, &__name__);
+            self.shared.promises.insert(path, handle);
+        }
     }
 
     /// FIXME: bug with inter-process sharing of type variables (pyimport "math")

crates/erg_compiler/module/promise.rs

@@ -119,6 +119,11 @@ impl SharedPromises {
             .insert(path, Promise::running(handle));
     }
 
+    pub fn mark_as_joined(&self, path: impl Into<NormalizedPathBuf>) {
+        let path = path.into();
+        self.promises.borrow_mut().insert(path, Promise::Joined);
+    }
+
     pub fn remove(&self, path: &NormalizedPathBuf) -> Option<Promise> {
         self.promises.borrow_mut().remove(path)
     }

crates/erg_linter/Cargo.toml

@@ -40,6 +40,7 @@ full-repl = ["erg_common/full-repl"]
 full = ["full-repl", "unicode", "pretty"]
 experimental = ["erg_common/experimental", "erg_parser/experimental", "erg_compiler/experimental"]
 log-level-error = ["erg_common/log-level-error", "erg_parser/log-level-error", "erg_compiler/log-level-error"]
+single-thread = ["erg_common/single-thread", "erg_parser/single-thread", "erg_compiler/single-thread"]
 
 [dependencies]
 erg_common = { workspace = true }

crates/erg_parser/Cargo.toml

@@ -21,6 +21,7 @@ experimental = ["erg_common/experimental"]
 pylib = ["dep:pyo3", "erg_common/pylib"]
 pylib_parser = ["pylib"]
 log-level-error = ["erg_common/log-level-error"]
+single-thread = ["erg_common/single-thread"]
 
 [dependencies]
 erg_common = { workspace = true }