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/*
* 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;
}
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