Palacios Public Git Repository

To checkout Palacios execute

  git clone http://v3vee.org/palacios/palacios.web/palacios.git
This will give you the master branch. You probably want the devel branch or one of the release branches. To switch to the devel branch, simply execute
  cd palacios
  git checkout --track -b devel origin/devel
The other branches are similar.


Add shared-exclusive (readers-writer) locks
[palacios.git] / palacios / include / palacios / vmm_lock.h
1 /* 
2  * This file is part of the Palacios Virtual Machine Monitor developed
3  * by the V3VEE Project with funding from the United States National 
4  * Science Foundation and the Department of Energy.  
5  *
6  * The V3VEE Project is a joint project between Northwestern University
7  * and the University of New Mexico.  You can find out more at 
8  * http://www.v3vee.org
9  *
10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu> 
11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org> 
12  * All rights reserved.
13  *
14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
15  *
16  * This is free software.  You are permitted to use,
17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
18  */
19
20 #ifndef __VMM_LOCK_H__
21 #define __VMM_LOCK_H__
22
23 #ifdef __V3VEE__
24 #include <palacios/vmm_types.h>
25
26 // Exclusive locks
27
28 typedef addr_t v3_lock_t;
29
30 int v3_lock_init(v3_lock_t * lock);
31 void v3_lock_deinit(v3_lock_t * lock);
32
33
34 // Interreupts unaffected
35 void v3_lock(v3_lock_t lock);
36 void v3_unlock(v3_lock_t lock);
37
38 // Interrupts disabled
39 addr_t v3_lock_irqsave(v3_lock_t lock);
40 void v3_unlock_irqrestore(v3_lock_t lock, addr_t irq_state);
41
42
43 // Reader-writer locks
44
45 typedef struct v3_rw_lock {
46     v3_lock_t lock;
47     sint64_t  reader_count;
48 } v3_rw_lock_t;
49
50 int v3_rw_lock_init(v3_rw_lock_t *lock);
51 void v3_rw_lock_deinit(v3_rw_lock_t *lock);
52
53 // A read lock is not exclusive and does not
54 // affect interrupts
55 void v3_read_lock(v3_rw_lock_t *lock);
56 void v3_read_unlock(v3_rw_lock_t *lock);
57
58 // A write lock is exclusive and may affect
59 // interrupts
60
61 // leaves interrupt state alone
62 void v3_write_lock(v3_rw_lock_t *lock);
63 void v3_read_unlock(v3_rw_lock_t *lock);
64
65 // turn interrupts off
66 addr_t v3_write_lock_irqsave(v3_rw_lock_t *lock);
67 void v3_write_unlock_irqrestore(v3_rw_lock_t *lock, addr_t irq_state);
68
69
70 #endif
71
72 #endif