e96a844909
Changed lock.h to like those changes. Moved the create_sem_etc() from the public OS.h to the private kernel only sem.h, cleaned it up a bit. gcc doesn't seem to like the "extern inlines" with -O0 -g, so I replaced an inline function in thread.h with "static inline" (which it does always like). git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1376 a95241bf-73f2-0310-859d-f6bbb57e9c96
136 lines
3.3 KiB
C
Executable File
136 lines
3.3 KiB
C
Executable File
/*
|
|
** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
|
|
** Distributed under the terms of the NewOS License.
|
|
*/
|
|
#ifndef _KERNEL_LOCK_H
|
|
#define _KERNEL_LOCK_H
|
|
|
|
#include <OS.h>
|
|
#include <kernel.h>
|
|
#include <debug.h>
|
|
|
|
typedef struct recursive_lock {
|
|
sem_id sem;
|
|
thread_id holder;
|
|
int recursion;
|
|
} recursive_lock;
|
|
|
|
int recursive_lock_create(recursive_lock *lock);
|
|
void recursive_lock_destroy(recursive_lock *lock);
|
|
bool recursive_lock_lock(recursive_lock *lock);
|
|
bool recursive_lock_unlock(recursive_lock *lock);
|
|
int recursive_lock_get_recursion(recursive_lock *lock);
|
|
|
|
#define ASSERT_LOCKED_RECURSIVE(r) { ASSERT(thread_get_current_thread_id() == (r)->holder); }
|
|
|
|
typedef struct mutex {
|
|
sem_id sem;
|
|
thread_id holder;
|
|
} mutex;
|
|
|
|
int mutex_init(mutex *m, const char *name);
|
|
void mutex_destroy(mutex *m);
|
|
void mutex_lock(mutex *m);
|
|
void mutex_unlock(mutex *m);
|
|
|
|
#define ASSERT_LOCKED_MUTEX(m) { ASSERT(thread_get_current_thread_id() == (m)->holder); }
|
|
|
|
// for read/write locks
|
|
#define MAX_READERS 100000
|
|
|
|
struct benaphore {
|
|
sem_id sem;
|
|
int32 count;
|
|
};
|
|
|
|
typedef struct benaphore benaphore;
|
|
|
|
// it may make sense to add a status field to the rw_lock to
|
|
// be able to check if the semaphore could be locked
|
|
|
|
// Note: using rw_lock in this way probably doesn't make too much sense
|
|
// for use in the kernel, we may change this in the near future.
|
|
// It basically uses 2 benaphores to create the rw_lock which is not
|
|
// necessary in the kernel -- axeld, 2002/07/18.
|
|
// Furthermore, those should probably be __inlines - I didn't know about
|
|
// them earlier... :-)
|
|
|
|
struct rw_lock {
|
|
sem_id sem;
|
|
int32 count;
|
|
benaphore writeLock;
|
|
};
|
|
|
|
typedef struct rw_lock rw_lock;
|
|
|
|
#define INIT_BENAPHORE(lock,name) \
|
|
{ \
|
|
(lock).count = 1; \
|
|
(lock).sem = create_sem(0, name); \
|
|
}
|
|
|
|
#define CHECK_BENAPHORE(lock) \
|
|
((lock).sem)
|
|
|
|
#define UNINIT_BENAPHORE(lock) \
|
|
delete_sem((lock).sem);
|
|
|
|
#define ACQUIRE_BENAPHORE(lock) \
|
|
(atomic_add(&((lock).count), -1) <= 0 ? \
|
|
acquire_sem_etc((lock).sem, 1, B_CAN_INTERRUPT, 0) \
|
|
: 0)
|
|
|
|
#define RELEASE_BENAPHORE(lock) \
|
|
{ \
|
|
if (atomic_add(&((lock).count), 1) < 0) \
|
|
release_sem_etc((lock).sem, 1, B_CAN_INTERRUPT); \
|
|
}
|
|
|
|
/* read/write lock */
|
|
#define INIT_RW_LOCK(lock,name) \
|
|
{ \
|
|
(lock).sem = create_sem(0, name); \
|
|
(lock).count = MAX_READERS; \
|
|
INIT_BENAPHORE((lock).writeLock, "r/w write lock"); \
|
|
}
|
|
|
|
#define CHECK_RW_LOCK(lock) \
|
|
((lock).sem)
|
|
|
|
#define UNINIT_RW_LOCK(lock) \
|
|
delete_sem((lock).sem); \
|
|
UNINIT_BENAPHORE((lock).writeLock)
|
|
|
|
#define ACQUIRE_READ_LOCK(lock) \
|
|
{ \
|
|
if (atomic_add(&(lock).count, -1) <= 0) \
|
|
acquire_sem_etc((lock).sem, 1, B_CAN_INTERRUPT, 0); \
|
|
}
|
|
|
|
#define RELEASE_READ_LOCK(lock) \
|
|
{ \
|
|
if (atomic_add(&(lock).count, 1) < 0) \
|
|
release_sem_etc((lock).sem, 1, B_CAN_INTERRUPT); \
|
|
}
|
|
|
|
#define ACQUIRE_WRITE_LOCK(lock) \
|
|
{ \
|
|
int32 readers; \
|
|
ACQUIRE_BENAPHORE((lock).writeLock); \
|
|
readers = atomic_add(&(lock).count, -MAX_READERS); \
|
|
if (readers < MAX_READERS) \
|
|
acquire_sem_etc((lock).sem,readers <= 0 ? 1 : MAX_READERS - readers, \
|
|
B_CAN_INTERRUPT,0); \
|
|
RELEASE_BENAPHORE((lock).writeLock); \
|
|
}
|
|
|
|
#define RELEASE_WRITE_LOCK(lock) \
|
|
{ \
|
|
int32 readers = atomic_add(&(lock).count,MAX_READERS); \
|
|
if (readers < 0) \
|
|
release_sem_etc((lock).sem,readers <= -MAX_READERS ? 1 : -readers,B_CAN_INTERRUPT); \
|
|
}
|
|
|
|
|
|
#endif /* _KERNEL_LOCK_H */
|