Initial project import

tools/v/vlib/net/mbedtls/mbedtls_threading.h

@@ -0,0 +1,65 @@
+/*
+ * mbedtls_threading.h - Win32 mutex callbacks for MBEDTLS_THREADING_ALT.
+ *
+ * On Windows, mbedtls is built with MBEDTLS_THREADING_C + MBEDTLS_THREADING_ALT
+ * (see thirdparty/mbedtls/include/mbedtls/mbedtls_config.h). The library then
+ * expects the embedder to supply the four mutex primitives via
+ * mbedtls_threading_set_alt(). These wrap a Win32 CRITICAL_SECTION; the matching
+ * mbedtls_threading_mutex_t type is defined in
+ * thirdparty/mbedtls/include/mbedtls/threading_alt.h.
+ *
+ * v_mbedtls_threading_setup() is called once from net.mbedtls' init() before any
+ * TLS use. On every other platform it is a no-op (pthread threading, or none).
+ */
+#ifndef V_MBEDTLS_THREADING_H
+#define V_MBEDTLS_THREADING_H
+
+#if defined(_WIN32) && defined(MBEDTLS_THREADING_ALT)
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <mbedtls/threading.h>
+#include <mbedtls/error.h>
+
+static void v_mbedtls_mutex_init(mbedtls_threading_mutex_t *m) {
+    InitializeCriticalSection(&m->cs);
+    m->is_valid = 1;
+}
+
+static void v_mbedtls_mutex_free(mbedtls_threading_mutex_t *m) {
+    if (m->is_valid) {
+        DeleteCriticalSection(&m->cs);
+        m->is_valid = 0;
+    }
+}
+
+static int v_mbedtls_mutex_lock(mbedtls_threading_mutex_t *m) {
+    if (!m->is_valid) {
+        return MBEDTLS_ERR_THREADING_BAD_INPUT_DATA;
+    }
+    EnterCriticalSection(&m->cs);
+    return 0;
+}
+
+static int v_mbedtls_mutex_unlock(mbedtls_threading_mutex_t *m) {
+    if (!m->is_valid) {
+        return MBEDTLS_ERR_THREADING_BAD_INPUT_DATA;
+    }
+    LeaveCriticalSection(&m->cs);
+    return 0;
+}
+
+static void v_mbedtls_threading_setup(void) {
+    mbedtls_threading_set_alt(v_mbedtls_mutex_init, v_mbedtls_mutex_free,
+        v_mbedtls_mutex_lock, v_mbedtls_mutex_unlock);
+}
+
+#else /* not (Windows + THREADING_ALT) */
+
+static void v_mbedtls_threading_setup(void) { }
+
+#endif
+
+#endif /* V_MBEDTLS_THREADING_H */