snapshot before regression test

includes/rwlock.py

@@ -0,0 +1,46 @@
+import t, c
+from stdint import *
+from w32.win32base import *
+from w32.win32sync import (
+    InitializeSRWLock,
+    AcquireSRWLockExclusive, ReleaseSRWLockExclusive,
+    AcquireSRWLockShared, ReleaseSRWLockShared
+)
+
+
+@t.Object
+class RWLock:
+    """基于 SRWLock 的读写锁，支持多读单写，不支持递归。
+
+    用法:
+        rwlock: RWLock = RWLock()
+        rwlock.acquire_read()
+        # ... 读取共享数据
+        rwlock.release_read()
+        rwlock.acquire_write()
+        # ... 修改共享数据
+        rwlock.release_write()
+    """
+    lock: VOIDPTR
+
+    def __init__(self):
+        InitializeSRWLock(c.Addr(self.lock))
+
+    def acquire_read(self):
+        AcquireSRWLockShared(c.Addr(self.lock))
+
+    def release_read(self):
+        ReleaseSRWLockShared(c.Addr(self.lock))
+
+    def acquire_write(self):
+        AcquireSRWLockExclusive(c.Addr(self.lock))
+
+    def release_write(self):
+        ReleaseSRWLockExclusive(c.Addr(self.lock))
+
+    def __enter__(self) -> 'RWLock' | t.CPtr:
+        self.acquire_write()
+        return self
+
+    def __exit__(self):
+        self.release_write()