early-access version 1255

externals/libressl/crypto/compat/crypto_lock_win.c

@@ -0,0 +1,56 @@
+/* $OpenBSD: crypto_lock.c,v 1.1 2018/11/11 06:41:28 bcook Exp $ */
+/*
+ * Copyright (c) 2019 Brent Cook <bcook@openbsd.org>
+ * Copyright (c) 2019 John Norrbin <jlnorrbin@johnex.se>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <windows.h>
+
+#include <openssl/crypto.h>
+
+static volatile LPCRITICAL_SECTION locks[CRYPTO_NUM_LOCKS] = { NULL };
+
+void
+CRYPTO_lock(int mode, int type, const char *file, int line)
+{
+	if (type < 0 || type >= CRYPTO_NUM_LOCKS)
+		return;
+
+	if (locks[type] == NULL) {
+		LPCRITICAL_SECTION lcs = malloc(sizeof(CRITICAL_SECTION));
+		if (lcs == NULL) exit(ENOMEM);
+		InitializeCriticalSection(lcs);
+		if (InterlockedCompareExchangePointer((PVOID*)&locks[type], (PVOID)lcs, NULL) != NULL) {
+			DeleteCriticalSection(lcs);
+			free(lcs);
+		}
+	}
+
+	if (mode & CRYPTO_LOCK)
+		EnterCriticalSection(locks[type]);
+	else
+		LeaveCriticalSection(locks[type]);
+}
+
+int
+CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
+    int line)
+{
+	/*
+	 * Windows is LLP64. sizeof(LONG) == sizeof(int) on 32-bit and 64-bit.
+	 */
+	int ret = InterlockedExchangeAdd((LONG *)pointer, (LONG)amount);
+	return ret + amount;
+}