添加rtthread相关代码

riscv/rtthread/components/libc/cplusplus/cpp11/gcc/thread.cpp

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-04-27     flybreak     the first version.
+ */
+
+#include "thread"
+#include "__utils.h"
+
+
+#define _RT_NPROCS 0
+
+namespace std
+{
+
+    extern "C"
+    {
+        static void* execute_native_thread_routine(void *p)
+        {
+            thread::invoker_base* t = static_cast<thread::invoker_base*>(p);
+            thread::invoker_base_ptr local;
+            local.swap(t->this_ptr); // tranfer the ownership of the invoker into the thread entry
+
+            local->invoke();
+
+            return NULL;
+        }
+    }
+
+    void thread::start_thread(invoker_base_ptr b)
+    {
+        auto raw_ptr = b.get();
+        // transfer the ownership of the invoker to the new thread
+        raw_ptr->this_ptr = std::move(b);
+        int err = pthread_create(&_m_thr.__cpp_thread_t, NULL,
+                &execute_native_thread_routine, raw_ptr);
+
+        if (err)
+        {
+            raw_ptr->this_ptr.reset();
+            throw_system_error(err, "Failed to create a thread");
+        }
+
+    }
+
+    thread::~thread()
+    {
+        if (joinable()) // when either not joined or not detached
+            terminate();
+    }
+
+    void thread::join()
+    {
+        int err = EINVAL;
+
+        if (joinable())
+            err = pthread_join(native_handle(), NULL);
+
+        if (err)
+        {
+            throw_system_error(err, "thread::join failed");
+        }
+
+        _m_thr = id();
+    }
+
+    void thread::detach()
+    {
+        int err = EINVAL;
+
+        if (joinable())
+            err = pthread_detach(native_handle());
+        if (err)
+        {
+            throw_system_error(err, "thread::detach failed");
+        }
+
+        _m_thr = id();
+    }
+
+    // TODO: not yet actually implemented.
+    // The standard states that the returned value should only be considered a hint.
+    unsigned thread::hardware_concurrency() noexcept
+    {
+        int __n = _RT_NPROCS;
+        if (__n < 0)
+            __n = 0;
+        return __n;
+    }
+}