1 files changed, 101 insertions, 0 deletions
diff --git a/src/libstrongswan/threading/windows/semaphore.c b/src/libstrongswan/threading/windows/semaphore.c
new file mode 100644
index 000000000..29f523d3e
--- /dev/null
+++ b/src/libstrongswan/threading/windows/semaphore.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2013 Martin Willi
+ * Copyright (C) 2013 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <library.h>
+#include <threading/semaphore.h>
+
+typedef struct private_semaphore_t private_semaphore_t;
+
+/**
+ * private data of a semaphore
+ */
+struct private_semaphore_t {
+	/**
+	 * public interface
+	 */
+	semaphore_t public;
+
+	/**
+	 * Handle to semaphore
+	 */
+	HANDLE handle;
+};
+
+METHOD(semaphore_t, timed_wait, bool,
+	private_semaphore_t *this, u_int timeout)
+{
+	/* use alertable wait to allow cancellation */
+	return WaitForSingleObjectEx(this->handle, timeout, TRUE) == WAIT_TIMEOUT;
+}
+
+METHOD(semaphore_t, timed_wait_abs, bool,
+	private_semaphore_t *this, timeval_t tv)
+{
+	DWORD timeout;
+	timeval_t now, diff;
+
+	time_monotonic(&now);
+	if (timercmp(&now, &tv, >))
+	{
+		return TRUE;
+	}
+	timersub(&tv, &now, &diff);
+	timeout = diff.tv_sec * 1000 + diff.tv_usec / 1000;
+
+	return timed_wait(this, timeout);
+}
+
+METHOD(semaphore_t, wait_, void,
+	private_semaphore_t *this)
+{
+	timed_wait(this, INFINITE);
+}
+
+METHOD(semaphore_t, post, void,
+	private_semaphore_t *this)
+{
+	ReleaseSemaphore(this->handle, 1, NULL);
+}
+
+METHOD(semaphore_t, destroy, void,
+	private_semaphore_t *this)
+{
+	CloseHandle(this->handle);
+	free(this);
+}
+
+/*
+ * Described in header
+ */
+semaphore_t *semaphore_create(u_int value)
+{
+	private_semaphore_t *this;
+
+	INIT(this,
+		.public = {
+			.wait = _wait_,
+			.timed_wait = _timed_wait,
+			.timed_wait_abs = _timed_wait_abs,
+			.post = _post,
+			.destroy = _destroy,
+		},
+		/* our API does not have an upper limit, but Windows requires one.
+		 * 0xFFFFFFF (268435455) is the highest value for which Windows does
+		 * not return ERROR_INVALID_PARAMETER, and should be sufficient. */
+		.handle = CreateSemaphore(NULL, value, 0xFFFFFFF, NULL),
+	);
+
+	return &this->public;
+}