f9ed63eb2d
Would be nice to actually share those. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24748 a95241bf-73f2-0310-859d-f6bbb57e9c96
83 lines
1.4 KiB
C++
83 lines
1.4 KiB
C++
/*
|
|
* Copyright 2002-2008, Axel Dörfler, axeld@pinc-software.de.
|
|
* Distributed under the terms of the MIT License.
|
|
*
|
|
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
|
|
* Distributed under the terms of the NewOS License.
|
|
*/
|
|
#ifndef _LIBROOT_LOCK_H
|
|
#define _LIBROOT_LOCK_H
|
|
|
|
#include <OS.h>
|
|
|
|
|
|
// TODO: Copied from the kernel private lock.h/lock.c. We should somehow make
|
|
// that code reusable.
|
|
|
|
|
|
namespace BPrivate {
|
|
|
|
|
|
typedef struct benaphore {
|
|
sem_id sem;
|
|
int32 count;
|
|
} benaphore;
|
|
|
|
|
|
static inline status_t
|
|
benaphore_init(benaphore *ben, const char *name)
|
|
{
|
|
if (ben == NULL || name == NULL)
|
|
return B_BAD_VALUE;
|
|
|
|
ben->count = 1;
|
|
ben->sem = create_sem(0, name);
|
|
if (ben->sem >= B_OK)
|
|
return B_OK;
|
|
|
|
return ben->sem;
|
|
}
|
|
|
|
|
|
static inline status_t
|
|
benaphore_lock_etc(benaphore *ben, uint32 flags, bigtime_t timeout)
|
|
{
|
|
if (atomic_add(&ben->count, -1) <= 0)
|
|
return acquire_sem_etc(ben->sem, 1, flags, timeout);
|
|
|
|
return B_OK;
|
|
}
|
|
|
|
|
|
static inline status_t
|
|
benaphore_lock(benaphore *ben)
|
|
{
|
|
if (atomic_add(&ben->count, -1) <= 0)
|
|
return acquire_sem(ben->sem);
|
|
|
|
return B_OK;
|
|
}
|
|
|
|
|
|
static inline status_t
|
|
benaphore_unlock(benaphore *ben)
|
|
{
|
|
if (atomic_add(&ben->count, 1) < 0)
|
|
return release_sem(ben->sem);
|
|
|
|
return B_OK;
|
|
}
|
|
|
|
|
|
} // namespace BPrivate
|
|
|
|
|
|
using BPrivate::benaphore;
|
|
using BPrivate::benaphore_init;
|
|
using BPrivate::benaphore_lock_etc;
|
|
using BPrivate::benaphore_lock;
|
|
using BPrivate::benaphore_unlock;
|
|
|
|
|
|
#endif // _LIBROOT_LOCK_H
|