src/rx/OBSD/rx_kmutex.h

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * rx_kmutex.h - mutex and condition variable macros for kernel environment.
  12  *
  13  * OpenBSD implementation by Jim Rees.
  14  */
  15
  16 #ifndef _RX_KMUTEX_H_
  17 #define _RX_KMUTEX_H_
  18
  19 #include <sys/lock.h>
  20
  21 /* You can't have AFS_GLOBAL_SUNLOCK and not RX_ENABLE_LOCKS */
  22 #define RX_ENABLE_LOCKS 1
  23
  24 /* This is incomplete and probably wouldn't work with NCPUS > 1 */
  25
  26 typedef int afs_kcondvar_t;
  27
  28 #define CV_INIT(cv, a, b, c)
  29 #define CV_DESTROY(cv)
  30 #define CV_WAIT(cv, lck)    { \
  31                                 int isGlockOwner = ISAFS_GLOCK(); \
  32                                 if (isGlockOwner) AFS_GUNLOCK();  \
  33                                 MUTEX_EXIT(lck);        \
  34                                 tsleep(cv, PSOCK, "afs_rx_cv_wait", 0);  \
  35                                 if (isGlockOwner) AFS_GLOCK();  \
  36                                 MUTEX_ENTER(lck); \
  37                             }
  38 #define CV_SIGNAL(cv)           wakeup_one(cv)
  39 #define CV_BROADCAST(cv)        wakeup(cv)
  40
  41 typedef struct {
  42     struct proc *owner;
  43 } afs_kmutex_t;
  44
  45 #define MUTEX_DEFAULT   0
  46
  47 #define MUTEX_INIT(a,b,c,d) \
  48     do { \
  49         (a)->owner = 0; \
  50     } while(0);
  51 #define MUTEX_DESTROY(a) \
  52     do { \
  53         (a)->owner = (struct proc *)-1; \
  54     } while(0);
  55 #define MUTEX_ENTER(a) \
  56     do { \
  57         osi_Assert((a)->owner == 0); \
  58         (a)->owner = curproc; \
  59     } while(0);
  60 #define MUTEX_TRYENTER(a) \
  61     ( osi_Assert((a)->owner == 0), (a)->owner = curproc, 1)
  62 #define MUTEX_EXIT(a) \
  63     do { \
  64         osi_Assert((a)->owner == curproc); \
  65         (a)->owner = 0; \
  66     } while(0);
  67 #define MUTEX_ASSERT(a) osi_Assert(((afs_kmutex_t *)(a))->owner == curproc)
  68
  69 #endif /* _RX_KMUTEX_H_ */