Support kernel semaphore.

2024-05-29 11:06:03 +08:00
parent bd7966c5a3
commit 5a2c07e1a9
17 changed files with 394 additions and 16 deletions
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2020 AIIT XUOS Lab
+ * XiUOS is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *        http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+/**
+ * @file semaphore.h
+ * @brief semaphore implementation
+ * @version 3.0
+ * @author AIIT XUOS Lab
+ * @date 2024.05.28
+ */
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "list.h"
+#include "object_allocator.h"
+
+/// @warning this is no in use
+enum {
+    KSEM_NOWAIT = -1,
+};
+
+struct ksemaphore {
+    uint32_t id;
+    int val;
+    /* list of waiting threads */
+    struct double_list_node wait_list_guard;
+    /* list to manage semaphores */
+    /// @todo Use RB-Tree to manage all semaphores
+    struct double_list_node sem_list_node;
+};
+
+struct XiziSemaphorePool {
+    uint32_t next_sem_id;
+    struct slab_allocator allocator;
+    struct double_list_node sem_list_guard;
+};
+
+void semaphore_pool_init(struct XiziSemaphorePool* sem_pool);
+int ksemaphore_alloc(struct XiziSemaphorePool* sem_pool, int val);
+bool ksemaphore_free(struct XiziSemaphorePool* sem_pool, uint32_t sem_id);
+bool ksemaphore_signal(struct XiziSemaphorePool* sem_pool, uint32_t sem_id);