Introduce Ractor mechanism for parallel execution

This commit introduces Ractor mechanism to run Ruby program in
parallel. See doc/ractor.md for more details about Ractor.
See ticket [Feature #17100] to see the implementation details
and discussions.

[Feature #17100]

This commit does not complete the implementation. You can find
many bugs on using Ractor. Also the specification will be changed
so that this feature is experimental. You will see a warning when
you make the first Ractor with `Ractor.new`.

I hope this feature can help programmers from thread-safety issues.

1 files changed, 31 insertions, 0 deletions

diff --git a/thread_win32.h b/thread_win32.h
index 4fd5f8b10f..0d95731587 100644
--- a/thread_win32.h
+++ b/thread_win32.h
@@ -32,4 +32,35 @@ typedef struct rb_global_vm_lock_struct {
     HANDLE lock;
 } rb_global_vm_lock_t;
 
+typedef DWORD native_tls_key_t; // TLS index
+
+static inline void *
+native_tls_get(native_tls_key_t key)
+{
+    void *ptr = TlsGetValue(key);
+    if (UNLIKELY(ptr == NULL)) {
+        rb_bug("TlsGetValue() returns NULL");
+    }
+    return ptr;
+}
+
+static inline void
+native_tls_set(native_tls_key_t key, void *ptr)
+{
+    if (UNLIKELY(TlsSetValue(key, ptr) == 0)) {
+        rb_bug("TlsSetValue() error");
+    }
+}
+
+void rb_native_mutex_lock(rb_nativethread_lock_t *lock);
+void rb_native_mutex_unlock(rb_nativethread_lock_t *lock);
+void rb_native_mutex_initialize(rb_nativethread_lock_t *lock);
+void rb_native_mutex_destroy(rb_nativethread_lock_t *lock);
+void rb_native_cond_signal(rb_nativethread_cond_t *cond);
+void rb_native_cond_broadcast(rb_nativethread_cond_t *cond);
+void rb_native_cond_wait(rb_nativethread_cond_t *cond, rb_nativethread_lock_t *mutex);
+void rb_native_cond_timedwait(rb_nativethread_cond_t *cond, rb_nativethread_lock_t *mutex, unsigned long msec);
+void rb_native_cond_initialize(rb_nativethread_cond_t *cond);
+void rb_native_cond_destroy(rb_nativethread_cond_t *cond);
+
 #endif /* RUBY_THREAD_WIN32_H */