Implemented futex and updated WaitQueue to support it

1. Implemented futex in modules/ruxfutex.

2. Updated `WaitQueue` in modules/ruxtask to support more operations.

3. Added a new script `scripts/debug/rust-gdb.sh` to help debugging.

4. Added a new make rule `debug_no_attach` to make debugging in external
gdb environment (like VSCode) easier.

Cargo.toml

@@ -50,6 +50,7 @@ members = [
     "modules/ruxhal",
     "modules/ruxruntime",
     "modules/ruxtask",
+    "modules/ruxfutex",
 
     "api/ruxfeat",
     "api/arceos_api",

Makefile

@@ -198,6 +198,9 @@ debug: build
 	  -ex 'continue' \
 	  -ex 'disp /16i $$pc'
 
+debug_no_attach: build
+	$(call run_qemu_debug)
+
 clippy:
 ifeq ($(origin ARCH), command line)
 	$(call cargo_clippy,--target $(TARGET))
@@ -245,4 +248,4 @@ clean_musl:
 	rm -rf ulib/ruxmusl/build_*
 	rm -rf ulib/ruxmusl/install
 
-.PHONY: all build disasm run justrun debug clippy fmt fmt_c test test_no_fail_fast clean clean_c clean_musl doc disk_image
+.PHONY: all build disasm run justrun debug clippy fmt fmt_c test test_no_fail_fast clean clean_c clean_musl doc disk_image debug_no_attach

api/ruxos_posix_api/Cargo.toml

@@ -19,7 +19,7 @@ default = []
 
 smp = ["ruxfeat/smp"]
 alloc = ["dep:axalloc", "ruxfeat/alloc"]
-multitask = ["ruxfeat/multitask", "ruxtask/multitask"]
+multitask = ["ruxfeat/multitask", "ruxtask/multitask", "dep:ruxfutex"]
 fd = ["alloc"]
 fs = ["dep:ruxfs", "ruxfeat/fs", "fd"]
 net = ["dep:axnet", "ruxfeat/net", "fd"]
@@ -41,6 +41,7 @@ ruxconfig = { path = "../../modules/ruxconfig" }
 axlog = { path = "../../modules/axlog" }
 ruxhal = { path = "../../modules/ruxhal" }
 axsync = { path = "../../modules/axsync" }
+ruxfutex = { path = "../../modules/ruxfutex", optional = true }
 axalloc = { path = "../../modules/axalloc", optional = true }
 ruxtask = { path = "../../modules/ruxtask", optional = true }
 ruxfs = { path = "../../modules/ruxfs", optional = true }
@@ -55,5 +56,7 @@ spin = { version = "0.9" }
 lazy_static = { version = "1.4", features = ["spin_no_std"] }
 flatten_objects = { path = "../../crates/flatten_objects" }
 
+bitflags = "2.2"
+
 [build-dependencies]
-bindgen ={ version = "0.66" }
+bindgen = { version = "0.66" }