[Partial] Build wasi-libc for Windows (#2338)

Build wasi-libc library on Windows since libuv may be not supported. This PR is a first step
to make it working, but there's still a number of changes to get it fully working.

core/shared/platform/linux-sgx/platform_internal.h

@@ -50,6 +50,7 @@ typedef pthread_t korp_thread;
 typedef pthread_t korp_tid;
 typedef pthread_mutex_t korp_mutex;
 typedef pthread_cond_t korp_cond;
+typedef pthread_rwlock_t korp_rwlock;
 typedef unsigned int korp_sem;
 
 #ifndef SGX_DISABLE_PTHREAD

core/shared/platform/linux-sgx/sgx_thread.c

@@ -210,3 +210,68 @@ os_thread_get_stack_boundary()
     /* TODO: get sgx stack boundary */
     return NULL;
 }
+
+int
+os_rwlock_init(korp_rwlock *lock)
+{
+#ifndef SGX_DISABLE_PTHREAD
+    assert(lock);
+
+    if (pthread_rwlock_init(lock, NULL) != BHT_OK)
+        return BHT_ERROR;
+#endif
+
+    return BHT_OK;
+}
+
+int
+os_rwlock_rdlock(korp_rwlock *lock)
+{
+#ifndef SGX_DISABLE_PTHREAD
+    assert(lock);
+
+    if (pthread_rwlock_rdlock(lock) != BHT_OK)
+        return BHT_ERROR;
+#endif
+
+    return BHT_OK;
+}
+
+int
+os_rwlock_wrlock(korp_rwlock *lock)
+{
+#ifndef SGX_DISABLE_PTHREAD
+    assert(lock);
+
+    if (pthread_rwlock_wrlock(lock) != BHT_OK)
+        return BHT_ERROR;
+#endif
+
+    return BHT_OK;
+}
+
+int
+os_rwlock_unlock(korp_rwlock *lock)
+{
+#ifndef SGX_DISABLE_PTHREAD
+    assert(lock);
+
+    if (pthread_rwlock_unlock(lock) != BHT_OK)
+        return BHT_ERROR;
+#endif
+
+    return BHT_OK;
+}
+
+int
+os_rwlock_destroy(korp_rwlock *lock)
+{
+#ifndef SGX_DISABLE_PTHREAD
+    assert(lock);
+
+    if (pthread_rwlock_destroy(lock) != BHT_OK)
+        return BHT_ERROR;
+#endif
+
+    return BHT_OK;
+}