src/rx/DARWIN/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  * MACOS implementation.
  14  */
  15
  16 #ifndef _RX_KMUTEX_H_
  17 #define _RX_KMUTEX_H_
  18
  19 #include <sys/lock.h>
  20 #include <kern/thread.h>
  21 #include <sys/vm.h>
  22
  23 #define RX_ENABLE_LOCKS         1
  24 #define AFS_GLOBAL_RXLOCK_KERNEL
  25
  26 /*
  27  * Condition variables
  28  *
  29  * In Digital Unix (OSF/1), we use something akin to the ancient sleep/wakeup
  30  * mechanism.  The condition variable itself plays no role; we just use its
  31  * address as a convenient unique number.
  32  *
  33  * XXX in darwin, both mach and bsd facilities are available. Should really
  34  * stick to one or the other (but mach locks don't have a _try.....)
  35  */
  36 #define CV_INIT(cv,a,b,c)
  37 #define CV_DESTROY(cv)
  38 #ifdef AFS_DARWIN14_ENV
  39 #define CV_WAIT(cv, lck)    { \
  40                                 int isGlockOwner = ISAFS_GLOCK(); \
  41                                 if (isGlockOwner) AFS_GUNLOCK();  \
  42                                 MUTEX_EXIT(lck);        \
  43                                 sleep(cv, PVFS);                \
  44                                 if (isGlockOwner) AFS_GLOCK();  \
  45                                 MUTEX_ENTER(lck); \
  46                             }
  47
  48 #define CV_TIMEDWAIT(cv,lck,t)  { \
  49                                 int isGlockOwner = ISAFS_GLOCK(); \
  50                                 if (isGlockOwner) AFS_GUNLOCK();  \
  51                                 MUTEX_EXIT(lck);        \
  52                                 tsleep(cv,PVFS, "afs_CV_TIMEDWAIT",t);  \
  53                                 if (isGlockOwner) AFS_GLOCK();  \
  54                                 MUTEX_ENTER(lck);       \
  55                             }
  56
  57 #define CV_SIGNAL(cv)           wakeup_one(cv)
  58 #define CV_BROADCAST(cv)        wakeup(cv)
  59 #else
  60 #define CV_WAIT(cv, lck)    { \
  61                                 int isGlockOwner = ISAFS_GLOCK(); \
  62                                 if (isGlockOwner) AFS_GUNLOCK();  \
  63                                 assert_wait((event_t)(cv), 0);  \
  64                                 MUTEX_EXIT(lck);        \
  65                                 thread_block(0);                \
  66                                 if (isGlockOwner) AFS_GLOCK();  \
  67                                 MUTEX_ENTER(lck); \
  68                             }
  69
  70 #define CV_TIMEDWAIT(cv,lck,t)  { \
  71                                 int isGlockOwner = ISAFS_GLOCK(); \
  72                                 if (isGlockOwner) AFS_GUNLOCK();  \
  73                                 assert_wait((event_t)(cv), 0);  \
  74                                 thread_set_timer(t, NSEC_PER_SEC/hz);   \
  75                                 MUTEX_EXIT(lck);        \
  76                                 thread_block(0);                \
  77                                 if (isGlockOwner) AFS_GLOCK();  \
  78                                 MUTEX_ENTER(lck);       \
  79                                 }
  80
  81 #define CV_SIGNAL(cv)           thread_wakeup_one((event_t)(cv))
  82 #define CV_BROADCAST(cv)        thread_wakeup((event_t)(cv))
  83 #endif
  84
  85 typedef struct {
  86     struct lock__bsd__ lock;
  87     thread_t owner;
  88 } afs_kmutex_t;
  89 typedef int afs_kcondvar_t;
  90
  91 #define osi_rxWakeup(cv)        thread_wakeup((event_t)(cv))
  92
  93 #define LOCK_INIT(a,b) \
  94     do { \
  95         lockinit(&(a)->lock,PSOCK, "afs rx lock", 0, 0); \
  96         (a)->owner = (thread_t)0; \
  97     } while(0);
  98 #define MUTEX_INIT(a,b,c,d) \
  99     do { \
 100         lockinit(&(a)->lock,PSOCK, "afs rx mutex", 0, 0); \
 101         (a)->owner = (thread_t)0; \
 102     } while(0);
 103 #define MUTEX_DESTROY(a) \
 104     do { \
 105         (a)->owner = (thread_t)-1; \
 106     } while(0);
 107 #define MUTEX_ENTER(a) \
 108     do { \
 109         lockmgr(&(a)->lock, LK_EXCLUSIVE, 0, current_proc()); \
 110         osi_Assert((a)->owner == (thread_t)0); \
 111         (a)->owner = current_thread(); \
 112     } while(0);
 113 #define MUTEX_TRYENTER(a) \
 114     ( lockmgr(&(a)->lock, LK_EXCLUSIVE|LK_NOWAIT, 0, current_proc()) ? 0 : ((a)->owner = current_thread(), 1) )
 115 #define xMUTEX_TRYENTER(a) \
 116     ( osi_Assert((a)->owner == (thread_t)0), (a)->owner = current_thread(), 1)
 117 #define MUTEX_EXIT(a) \
 118     do { \
 119         osi_Assert((a)->owner == current_thread()); \
 120         (a)->owner = (thread_t)0; \
 121         lockmgr(&(a)->lock, LK_RELEASE, 0, current_proc()); \
 122     } while(0);
 123
 124 #undef MUTEX_ISMINE
 125 #define MUTEX_ISMINE(a) (((afs_kmutex_t *)(a))->owner == current_thread())
 126
 127 #undef osirx_AssertMine
 128 extern void osirx_AssertMine(afs_kmutex_t *lockaddr, char *msg);
 129
 130 #endif /* _RX_KMUTEX_H_ */
 131