1 files changed, 76 insertions, 0 deletions
diff --git a/ports/windows/sleep.c b/ports/windows/sleep.c
new file mode 100644
index 000000000..6043ec7b7
--- /dev/null
+++ b/ports/windows/sleep.c
@@ -0,0 +1,76 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <windows.h>
+#include <errno.h>
+#include <limits.h>
+
+HANDLE waitTimer = NULL;
+
+void init_sleep(void) {
+    waitTimer = CreateWaitableTimer(NULL, TRUE, NULL);
+}
+
+void deinit_sleep(void) {
+    if (waitTimer != NULL) {
+        CloseHandle(waitTimer);
+        waitTimer = NULL;
+    }
+}
+
+int usleep_impl(__int64 usec) {
+    if (waitTimer == NULL) {
+        errno = EAGAIN;
+        return -1;
+    }
+    if (usec < 0 || usec > LLONG_MAX / 10) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    LARGE_INTEGER ft;
+    ft.QuadPart = -10 * usec; // 100 nanosecond interval, negative value = relative time
+    if (SetWaitableTimer(waitTimer, &ft, 0, NULL, NULL, 0) == 0) {
+        errno = EINVAL;
+        return -1;
+    }
+    if (WaitForSingleObject(waitTimer, INFINITE) != WAIT_OBJECT_0) {
+        errno = EAGAIN;
+        return -1;
+    }
+    return 0;
+}
+
+#ifdef _MSC_VER // mingw and the likes provide their own usleep()
+int usleep(__int64 usec) {
+    return usleep_impl(usec);
+}
+#endif
+
+void msec_sleep(double msec) {
+    const double usec = msec * 1000.0;
+    usleep_impl(usec > (double)LLONG_MAX ? LLONG_MAX : (__int64)usec);
+}