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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 "thread.h"
#include <utils/debug.h>
#include <threading/mutex.h>
#include <threading/condvar.h>
typedef struct private_mutex_t private_mutex_t;
typedef struct private_condvar_t private_condvar_t;
/**
* private data of mutex
*/
struct private_mutex_t {
/**
* public functions
*/
mutex_t public;
/**
* wrapped critical section
*/
CRITICAL_SECTION cs;
/**
* Recursive lock count
*/
u_int times;
};
/**
* private data of condvar
*/
struct private_condvar_t {
/**
* public functions
*/
condvar_t public;
/**
* wrapped condition variable
*/
CONDITION_VARIABLE cv;
};
METHOD(mutex_t, lock, void,
private_mutex_t *this)
{
EnterCriticalSection(&this->cs);
this->times++;
}
METHOD(mutex_t, unlock, void,
private_mutex_t *this)
{
this->times--;
LeaveCriticalSection(&this->cs);
}
METHOD(mutex_t, mutex_destroy, void,
private_mutex_t *this)
{
DeleteCriticalSection(&this->cs);
free(this);
}
/*
* see header file
*/
mutex_t *mutex_create(mutex_type_t type)
{
private_mutex_t *this;
INIT(this,
.public = {
.lock = _lock,
.unlock = _unlock,
.destroy = _mutex_destroy,
},
);
/* CriticalSections are recursive, we use it for all mutex types. */
InitializeCriticalSection(&this->cs);
return &this->public;
}
METHOD(condvar_t, timed_wait, bool,
private_condvar_t *this, mutex_t *pubmutex, u_int timeout)
{
private_mutex_t *mutex = (private_mutex_t*)pubmutex;
u_int times;
bool ret;
thread_set_active_condvar(&this->cv);
/* while a CriticalSection is recursive, waiting in a condvar releases
* only one mutex. So release (and reacquire) all locks except the last. */
times = mutex->times;
while (mutex->times-- > 1)
{
LeaveCriticalSection(&mutex->cs);
}
ret = SleepConditionVariableCS(&this->cv, &mutex->cs, timeout);
while (++mutex->times < times)
{
EnterCriticalSection(&mutex->cs);
}
thread_set_active_condvar(NULL);
return ret == 0;
}
METHOD(condvar_t, wait_, void,
private_condvar_t *this, mutex_t *mutex)
{
timed_wait(this, mutex, INFINITE);
}
METHOD(condvar_t, timed_wait_abs, bool,
private_condvar_t *this, mutex_t *mutex, 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, mutex, timeout);
}
METHOD(condvar_t, signal_, void,
private_condvar_t *this)
{
WakeConditionVariable(&this->cv);
}
METHOD(condvar_t, broadcast, void,
private_condvar_t *this)
{
WakeAllConditionVariable(&this->cv);
}
METHOD(condvar_t, condvar_destroy, void,
private_condvar_t *this)
{
free(this);
}
/*
* see header file
*/
condvar_t *condvar_create(condvar_type_t type)
{
private_condvar_t *this;
INIT(this,
.public = {
.wait = _wait_,
.timed_wait = _timed_wait,
.timed_wait_abs = _timed_wait_abs,
.signal = _signal_,
.broadcast = _broadcast,
.destroy = _condvar_destroy,
}
);
InitializeConditionVariable(&this->cv);
return &this->public;
}
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