tests: add simple semaphore test

Author: tylerwhall

tests/semaphore/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+get_filename_component(ZEPHYR_RUST ${CMAKE_CURRENT_SOURCE_DIR}/../.. ABSOLUTE)
+list(APPEND ZEPHYR_MODULES ${ZEPHYR_RUST})
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(rust)
+target_sources(app PRIVATE ./src/main.c)

tests/semaphore/Cargo.lock

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+[package]
+name = "app"
+version = "0.1.0"
+authors = ["Tyler Hall <tylerwhall@gmail.com>"]
+edition = "2018"
+
+[dependencies]

tests/semaphore/Cargo.toml

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+CONFIG_RUST=y
+CONFIG_ZTEST=y

tests/semaphore/prj.conf

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+extern crate libc;
+extern crate zephyr;
+extern crate zephyr_macros;
+
+use libc::c_void;
+use zephyr::context::Kernel as C;
+use zephyr::semaphore::*;
+
+zephyr_macros::k_sem_define!(TEST_SEM, 0, 10);
+
+#[no_mangle]
+pub extern "C" fn rust_sem_thread(_a: *const c_void, _b: *const c_void, _c: *const c_void) {
+    for i in 0..10 {
+        println!("Giving {}", i);
+        TEST_SEM.give::<C>();
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn rust_test_main() {
+    for i in 0..10 {
+        println!("Taking {}", i);
+        TEST_SEM.take::<C>();
+        println!("Took {}", i);
+    }
+}

tests/semaphore/src/lib.rs

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+#include <zephyr.h>
+
+extern void rust_test_main(void);
+extern void rust_sem_thread(void *, void *, void *);
+
+K_THREAD_DEFINE(sem_thread, 1024, rust_sem_thread, NULL, NULL, NULL,
+                K_LOWEST_APPLICATION_THREAD_PRIO, 0, K_NO_WAIT);
+
+void test_main(void)
+{
+    rust_test_main();
+}

tests/semaphore/src/main.c

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+common:
+    arch_whitelist: x86 arm posix
+tests:
+    rust.semaphore:
+        tags: rust