re-org platform APIs, simplify porting process (#201)

Co-authored-by: Xu Jun <jun1.xu@intel.com>

core/shared/utils/bh_queue.h

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _BH_QUEUE_H
+#define _BH_QUEUE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "bh_platform.h"
+
+struct bh_queue_node;
+typedef struct bh_queue_node * bh_message_t;
+struct bh_queue;
+typedef struct bh_queue bh_queue;
+
+typedef void (*bh_queue_handle_msg_callback)(void *message, void *arg);
+
+#define bh_queue_malloc BH_MALLOC
+#define bh_queue_free BH_FREE
+
+#define bh_queue_mutex korp_mutex
+#define bh_queue_cond korp_cond
+
+#define bh_queue_mutex_init os_mutex_init
+#define bh_queue_mutex_destroy os_mutex_destroy
+#define bh_queue_mutex_lock os_mutex_lock
+#define bh_queue_mutex_unlock os_mutex_unlock
+
+#define bh_queue_cond_init os_cond_init
+#define bh_queue_cond_destroy os_cond_destroy
+#define bh_queue_cond_wait os_cond_wait
+#define bh_queue_cond_timedwait os_cond_reltimedwait
+#define bh_queue_cond_signal os_cond_signal
+#define bh_queue_cond_broadcast os_cond_broadcast
+
+typedef void (*bh_msg_cleaner)(void *msg);
+
+bh_queue *
+bh_queue_create();
+
+void
+bh_queue_destroy(bh_queue *queue);
+
+char * bh_message_payload(bh_message_t message);
+uint32 bh_message_payload_len(bh_message_t message);
+int bh_message_type(bh_message_t message);
+
+bh_message_t bh_new_msg(unsigned short tag, void *body, unsigned int len,
+                        void * handler);
+void bh_free_msg(bh_message_t msg);
+bool bh_post_msg(bh_queue *queue, unsigned short tag, void *body,
+                 unsigned int len);
+bool bh_post_msg2(bh_queue *queue, bh_message_t msg);
+
+bh_message_t bh_get_msg(bh_queue *queue, int timeout);
+
+unsigned
+bh_queue_get_message_count(bh_queue *queue);
+
+void
+bh_queue_enter_loop_run(bh_queue *queue,
+                        bh_queue_handle_msg_callback handle_cb,
+                        void *arg);
+void
+bh_queue_exit_loop_run(bh_queue *queue);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* #ifndef _BH_QUEUE_H */
+