libc/sysdeps/linux/common/bits/uClibc_mutex.h

   1 /* Copyright (C) 2006   Manuel Novoa III    <mjn3@codepoet.org>
   2  *
   3  * GNU Library General Public License (LGPL) version 2 or later.
   4  *
   5  * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
   6  */
   7
   8 #ifndef _UCLIBC_MUTEX_H
   9 #define _UCLIBC_MUTEX_H
  10
  11 #include <features.h>
  12
  13 #ifdef __UCLIBC_HAS_THREADS__
  14
  15 #include <pthread.h>
  16 #ifdef _LIBC
  17 #include <bits/uClibc_pthread.h>
  18 #endif
  19
  20 #define __UCLIBC_MUTEX_TYPE                             pthread_mutex_t
  21
  22 #define __UCLIBC_MUTEX(M)                               pthread_mutex_t M
  23 #define __UCLIBC_MUTEX_INIT(M,I)                        pthread_mutex_t M = I
  24 #define __UCLIBC_MUTEX_STATIC(M,I)                      static pthread_mutex_t M = I
  25 #define __UCLIBC_MUTEX_EXTERN(M)                        extern pthread_mutex_t M
  26
  27 #define __UCLIBC_MUTEX_INIT_VAR(M)                                                              \
  28                 ((M) = (pthread_mutex_t) PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
  29
  30 #define __UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(M)                                                            \
  31                 __pthread_mutex_lock(&(M))
  32
  33 #define __UCLIBC_MUTEX_UNLOCK_CANCEL_UNSAFE(M)                                                          \
  34                 __pthread_mutex_unlock(&(M))
  35
  36 #define __UCLIBC_MUTEX_TRYLOCK_CANCEL_UNSAFE(M)                                                         \
  37                 __pthread_mutex_trylock(&(M))
  38
  39 #define __UCLIBC_MUTEX_CONDITIONAL_LOCK(M,C)                                                            \
  40         do {                                                                                            \
  41                 struct _pthread_cleanup_buffer __infunc_pthread_cleanup_buffer;                         \
  42                 int __infunc_need_locking = (C);                                                        \
  43                 if (__infunc_need_locking) {                                                            \
  44                         _pthread_cleanup_push_defer(&__infunc_pthread_cleanup_buffer,                   \
  45                                            (void (*) (void *))__pthread_mutex_unlock,                   \
  46                                                                                 &(M));                  \
  47                         __pthread_mutex_lock(&(M));                                                     \
  48                 }                                                                                       \
  49                 ((void)0)
  50
  51 #define __UCLIBC_MUTEX_CONDITIONAL_UNLOCK(M,C)                                                          \
  52                 if (__infunc_need_locking) {                                                            \
  53                         _pthread_cleanup_pop_restore(&__infunc_pthread_cleanup_buffer,1);               \
  54                 }                                                                                       \
  55         } while (0)
  56
  57 #define __UCLIBC_MUTEX_AUTO_LOCK_VAR(A)         int A
  58
  59 #define __UCLIBC_MUTEX_AUTO_LOCK(M,A,V)                                                                 \
  60         __UCLIBC_MUTEX_CONDITIONAL_LOCK(M,((A=(V)) == 0))
  61
  62 #define __UCLIBC_MUTEX_AUTO_UNLOCK(M,A)                                                                 \
  63         __UCLIBC_MUTEX_CONDITIONAL_UNLOCK(M,(A == 0))
  64
  65 #define __UCLIBC_MUTEX_LOCK(M)                                                                          \
  66         __UCLIBC_MUTEX_CONDITIONAL_LOCK(M, 1)
  67
  68 #define __UCLIBC_MUTEX_UNLOCK(M)                                                                        \
  69         __UCLIBC_MUTEX_CONDITIONAL_UNLOCK(M, 1)
  70
  71 #ifdef __USE_STDIO_FUTEXES__
  72
  73 #include <bits/stdio-lock.h>
  74
  75 #define __UCLIBC_IO_MUTEX(M)                    _IO_lock_t M
  76 #define __UCLIBC_IO_MUTEX_LOCK(M)               _IO_lock_lock(M)
  77 #define __UCLIBC_IO_MUTEX_UNLOCK(M)     _IO_lock_unlock(M)
  78 #define __UCLIBC_IO_MUTEX_TRYLOCK(M)    _IO_lock_trylock(M)
  79 #define __UCLIBC_IO_MUTEX_INIT(M)       _IO_lock_t M = _IO_lock_initializer
  80 #define __UCLIBC_IO_MUTEX_EXTERN(M)             extern _IO_lock_t M
  81
  82 #define __UCLIBC_IO_MUTEX_CONDITIONAL_LOCK(M,C)         \
  83         if (C) {                                                                                \
  84                 _IO_lock_lock(M);                                                       \
  85         }
  86
  87 #define __UCLIBC_IO_MUTEX_CONDITIONAL_UNLOCK(M,C)       \
  88         if (C) {                                                                                \
  89                 _IO_lock_unlock(M);                                                     \
  90         }
  91
  92 #define __UCLIBC_IO_MUTEX_AUTO_LOCK(M,A,V)                      \
  93                 __UCLIBC_IO_MUTEX_CONDITIONAL_LOCK(M,((A=(V))) == 0)
  94
  95 #define __UCLIBC_IO_MUTEX_AUTO_UNLOCK(M,A)                      \
  96                 __UCLIBC_IO_MUTEX_CONDITIONAL_UNLOCK(M,((A) == 0))
  97
  98 #define __UCLIBC_IO_MUTEX_LOCK_CANCEL_UNSAFE(M)         _IO_lock_lock(M)
  99 #define __UCLIBC_IO_MUTEX_UNLOCK_CANCEL_UNSAFE(M)       _IO_lock_unlock(M)
 100
 101 #else /* of __USE_STDIO_FUTEXES__ */
 102
 103 #define __UCLIBC_IO_MUTEX(M)                        __UCLIBC_MUTEX(M)
 104 #define __UCLIBC_IO_MUTEX_LOCK(M)                   __UCLIBC_MUTEX_CONDITIONAL_LOCK(M, 1)
 105 #define __UCLIBC_IO_MUTEX_UNLOCK(M)                 __UCLIBC_MUTEX_CONDITIONAL_UNLOCK(M, 1)
 106 #define __UCLIBC_IO_MUTEX_TRYLOCK(M)                __UCLIBC_MUTEX_TRYLOCK_CANCEL_UNSAFE(M)
 107 #define __UCLIBC_IO_MUTEX_INIT(M)                   __UCLIBC_MUTEX_INIT(M, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
 108 #define __UCLIBC_IO_MUTEX_EXTERN(M)                 __UCLIBC_MUTEX_EXTERN(M)
 109 #define __UCLIBC_IO_MUTEX_AUTO_LOCK(M,A,V)          __UCLIBC_MUTEX_AUTO_LOCK(M,A,V)
 110 #define __UCLIBC_IO_MUTEX_AUTO_UNLOCK(M,A)          __UCLIBC_MUTEX_AUTO_UNLOCK(M,A)
 111 #define __UCLIBC_IO_MUTEX_LOCK_CANCEL_UNSAFE(M)     __UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(M)
 112 #define __UCLIBC_IO_MUTEX_UNLOCK_CANCEL_UNSAFE(M)   __UCLIBC_MUTEX_UNLOCK_CANCEL_UNSAFE(M)
 113 #define __UCLIBC_IO_MUTEX_CONDITIONAL_LOCK(M,C)     __UCLIBC_MUTEX_CONDITIONAL_LOCK(M,C)
 114 #define __UCLIBC_IO_MUTEX_CONDITIONAL_UNLOCK(M,C)   __UCLIBC_MUTEX_CONDITIONAL_UNLOCK(M,C)
 115
 116 #endif /* of __USE_STDIO_FUTEXES__ */
 117
 118
 119 #else /* of __UCLIBC_HAS_THREADS__ */
 120
 121 #define __UCLIBC_MUTEX(M)                               void *__UCLIBC_MUTEX_DUMMY_ ## M
 122 #define __UCLIBC_MUTEX_INIT(M,I)                        extern void *__UCLIBC_MUTEX_DUMMY_ ## M
 123 #define __UCLIBC_MUTEX_STATIC(M,I)                      extern void *__UCLIBC_MUTEX_DUMMY_ ## M
 124 #define __UCLIBC_MUTEX_EXTERN(M)                        extern void *__UCLIBC_MUTEX_DUMMY_ ## M
 125
 126 #define __UCLIBC_MUTEX_INIT_VAR(M)                                      ((void)0)
 127 #define __UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(M)            ((void)0)
 128 #define __UCLIBC_MUTEX_UNLOCK_CANCEL_UNSAFE(M)          ((void)0)
 129 #define __UCLIBC_MUTEX_TRYLOCK_CANCEL_UNSAFE(M)         (0)     /* Always succeed? */
 130
 131 #define __UCLIBC_MUTEX_CONDITIONAL_LOCK(M,C)            ((void)0)
 132 #define __UCLIBC_MUTEX_CONDITIONAL_UNLOCK(M,C)          ((void)0)
 133
 134 #define __UCLIBC_MUTEX_AUTO_LOCK_VAR(A)                 ((void)0)
 135 #define __UCLIBC_MUTEX_AUTO_LOCK(M,A,V)                 ((void)0)
 136 #define __UCLIBC_MUTEX_AUTO_UNLOCK(M,A)                 ((void)0)
 137
 138 #define __UCLIBC_MUTEX_LOCK(M)                          ((void)0)
 139 #define __UCLIBC_MUTEX_UNLOCK(M)                        ((void)0)
 140
 141 #define __UCLIBC_IO_MUTEX(M)                        __UCLIBC_MUTEX(M)
 142 #define __UCLIBC_IO_MUTEX_LOCK(M)                   __UCLIBC_MUTEX_CONDITIONAL_LOCK(M, 1)
 143 #define __UCLIBC_IO_MUTEX_UNLOCK(M)                 __UCLIBC_MUTEX_CONDITIONAL_UNLOCK(M, 1)
 144 #define __UCLIBC_IO_MUTEX_TRYLOCK(M)                __UCLIBC_MUTEX_TRYLOCK_CANCEL_UNSAFE(M)
 145 #define __UCLIBC_IO_MUTEX_INIT(M)                   __UCLIBC_MUTEX_INIT(M, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
 146 #define __UCLIBC_IO_MUTEX_EXTERN(M)                 __UCLIBC_MUTEX_EXTERN(M)
 147 #define __UCLIBC_IO_MUTEX_AUTO_LOCK(M,A,V)          __UCLIBC_MUTEX_AUTO_LOCK(M,A,V)
 148 #define __UCLIBC_IO_MUTEX_AUTO_UNLOCK(M,A)          __UCLIBC_MUTEX_AUTO_UNLOCK(M,A)
 149 #define __UCLIBC_IO_MUTEX_LOCK_CANCEL_UNSAFE(M)     __UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(M)
 150 #define __UCLIBC_IO_MUTEX_UNLOCK_CANCEL_UNSAFE(M)   __UCLIBC_MUTEX_UNLOCK_CANCEL_UNSAFE(M)
 151 #define __UCLIBC_IO_MUTEX_CONDITIONAL_LOCK(M,C)     __UCLIBC_MUTEX_CONDITIONAL_LOCK(M,C)
 152 #define __UCLIBC_IO_MUTEX_CONDITIONAL_UNLOCK(M,C)   __UCLIBC_MUTEX_CONDITIONAL_UNLOCK(M,C)
 153
 154 #endif /* of __UCLIBC_HAS_THREADS__ */
 155
 156 #define __UCLIBC_IO_MUTEX_TRYLOCK_CANCEL_UNSAFE(M)      \
 157                 __UCLIBC_IO_MUTEX_TRYLOCK(M)
 158
 159 #endif /* _UCLIBC_MUTEX_H */