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/*
*
* Nim's Runtime Library
* (c) Copyright 2017 Emery Hemingway
*
* See the file "copying.txt", included in this
* distribution, for details about the copyright.
*
*/
#ifndef _GENODE_CPP__SYSLOCKS_H_
#define _GENODE_CPP__SYSLOCKS_H_
/* Genode includes */
#include <base/semaphore.h>
#include <base/mutex.h>
namespace Nim {
struct SysLock;
struct SysCond;
}
struct Nim::SysLock
{
Genode::Mutex _mutex_a, _mutex_b;
bool _locked;
void acquireSys()
{
Genode::Mutex::Guard guard(_mutex_a);
_locked = true;
_mutex_b.acquire();
}
bool tryAcquireSys()
{
if (_locked)
return false;
Genode::Mutex::Guard guard(_mutex_a);
if (_locked) {
return false;
} else {
_locked = true;
_mutex_b.acquire();
return true;
}
}
void releaseSys()
{
Genode::Mutex::Guard guard(_mutex_a);
_locked = false;
_mutex_b.release();
}
};
struct Nim::SysCond
{
Genode::Semaphore _semaphore;
void waitSysCond(SysLock &syslock)
{
syslock.releaseSys();
_semaphore.down();
syslock.acquireSys();
}
void signalSysCond()
{
_semaphore.up();
}
void broadcastSysCond()
{
_semaphore.up();
}
};
#endif
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