lib/libspl/include/atomic.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_ATOMIC_H
  28 #define _SYS_ATOMIC_H
  29
  30 #include <sys/types.h>
  31 #include <sys/inttypes.h>
  32
  33 #ifdef  __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 #if defined(__STDC__)
  38 /*
  39  * Increment target.
  40  */
  41 extern void atomic_inc_8(volatile uint8_t *);
  42 extern void atomic_inc_uchar(volatile uchar_t *);
  43 extern void atomic_inc_16(volatile uint16_t *);
  44 extern void atomic_inc_ushort(volatile ushort_t *);
  45 extern void atomic_inc_32(volatile uint32_t *);
  46 extern void atomic_inc_uint(volatile uint_t *);
  47 extern void atomic_inc_ulong(volatile ulong_t *);
  48 #if defined(_INT64_TYPE)
  49 extern void atomic_inc_64(volatile uint64_t *);
  50 #endif
  51
  52 /*
  53  * Decrement target
  54  */
  55 extern void atomic_dec_8(volatile uint8_t *);
  56 extern void atomic_dec_uchar(volatile uchar_t *);
  57 extern void atomic_dec_16(volatile uint16_t *);
  58 extern void atomic_dec_ushort(volatile ushort_t *);
  59 extern void atomic_dec_32(volatile uint32_t *);
  60 extern void atomic_dec_uint(volatile uint_t *);
  61 extern void atomic_dec_ulong(volatile ulong_t *);
  62 #if defined(_INT64_TYPE)
  63 extern void atomic_dec_64(volatile uint64_t *);
  64 #endif
  65
  66 /*
  67  * Add delta to target
  68  */
  69 extern void atomic_add_8(volatile uint8_t *, int8_t);
  70 extern void atomic_add_char(volatile uchar_t *, signed char);
  71 extern void atomic_add_16(volatile uint16_t *, int16_t);
  72 extern void atomic_add_short(volatile ushort_t *, short);
  73 extern void atomic_add_32(volatile uint32_t *, int32_t);
  74 extern void atomic_add_int(volatile uint_t *, int);
  75 extern void atomic_add_ptr(volatile void *, ssize_t);
  76 extern void atomic_add_long(volatile ulong_t *, long);
  77 #if defined(_INT64_TYPE)
  78 extern void atomic_add_64(volatile uint64_t *, int64_t);
  79 #endif
  80
  81 /*
  82  * logical OR bits with target
  83  */
  84 extern void atomic_or_8(volatile uint8_t *, uint8_t);
  85 extern void atomic_or_uchar(volatile uchar_t *, uchar_t);
  86 extern void atomic_or_16(volatile uint16_t *, uint16_t);
  87 extern void atomic_or_ushort(volatile ushort_t *, ushort_t);
  88 extern void atomic_or_32(volatile uint32_t *, uint32_t);
  89 extern void atomic_or_uint(volatile uint_t *, uint_t);
  90 extern void atomic_or_ulong(volatile ulong_t *, ulong_t);
  91 #if defined(_INT64_TYPE)
  92 extern void atomic_or_64(volatile uint64_t *, uint64_t);
  93 #endif
  94
  95 /*
  96  * logical AND bits with target
  97  */
  98 extern void atomic_and_8(volatile uint8_t *, uint8_t);
  99 extern void atomic_and_uchar(volatile uchar_t *, uchar_t);
 100 extern void atomic_and_16(volatile uint16_t *, uint16_t);
 101 extern void atomic_and_ushort(volatile ushort_t *, ushort_t);
 102 extern void atomic_and_32(volatile uint32_t *, uint32_t);
 103 extern void atomic_and_uint(volatile uint_t *, uint_t);
 104 extern void atomic_and_ulong(volatile ulong_t *, ulong_t);
 105 #if defined(_INT64_TYPE)
 106 extern void atomic_and_64(volatile uint64_t *, uint64_t);
 107 #endif
 108
 109 /*
 110  * As above, but return the new value.  Note that these _nv() variants are
 111  * substantially more expensive on some platforms than the no-return-value
 112  * versions above, so don't use them unless you really need to know the
 113  * new value *atomically* (e.g. when decrementing a reference count and
 114  * checking whether it went to zero).
 115  */
 116
 117 /*
 118  * Increment target and return new value.
 119  */
 120 extern uint8_t atomic_inc_8_nv(volatile uint8_t *);
 121 extern uchar_t atomic_inc_uchar_nv(volatile uchar_t *);
 122 extern uint16_t atomic_inc_16_nv(volatile uint16_t *);
 123 extern ushort_t atomic_inc_ushort_nv(volatile ushort_t *);
 124 extern uint32_t atomic_inc_32_nv(volatile uint32_t *);
 125 extern uint_t atomic_inc_uint_nv(volatile uint_t *);
 126 extern ulong_t atomic_inc_ulong_nv(volatile ulong_t *);
 127 #if defined(_INT64_TYPE)
 128 extern uint64_t atomic_inc_64_nv(volatile uint64_t *);
 129 #endif
 130
 131 /*
 132  * Decrement target and return new value.
 133  */
 134 extern uint8_t atomic_dec_8_nv(volatile uint8_t *);
 135 extern uchar_t atomic_dec_uchar_nv(volatile uchar_t *);
 136 extern uint16_t atomic_dec_16_nv(volatile uint16_t *);
 137 extern ushort_t atomic_dec_ushort_nv(volatile ushort_t *);
 138 extern uint32_t atomic_dec_32_nv(volatile uint32_t *);
 139 extern uint_t atomic_dec_uint_nv(volatile uint_t *);
 140 extern ulong_t atomic_dec_ulong_nv(volatile ulong_t *);
 141 #if defined(_INT64_TYPE)
 142 extern uint64_t atomic_dec_64_nv(volatile uint64_t *);
 143 #endif
 144
 145 /*
 146  * Add delta to target
 147  */
 148 extern uint8_t atomic_add_8_nv(volatile uint8_t *, int8_t);
 149 extern uchar_t atomic_add_char_nv(volatile uchar_t *, signed char);
 150 extern uint16_t atomic_add_16_nv(volatile uint16_t *, int16_t);
 151 extern ushort_t atomic_add_short_nv(volatile ushort_t *, short);
 152 extern uint32_t atomic_add_32_nv(volatile uint32_t *, int32_t);
 153 extern uint_t atomic_add_int_nv(volatile uint_t *, int);
 154 extern void *atomic_add_ptr_nv(volatile void *, ssize_t);
 155 extern ulong_t atomic_add_long_nv(volatile ulong_t *, long);
 156 #if defined(_INT64_TYPE)
 157 extern uint64_t atomic_add_64_nv(volatile uint64_t *, int64_t);
 158 #endif
 159
 160 /*
 161  * logical OR bits with target and return new value.
 162  */
 163 extern uint8_t atomic_or_8_nv(volatile uint8_t *, uint8_t);
 164 extern uchar_t atomic_or_uchar_nv(volatile uchar_t *, uchar_t);
 165 extern uint16_t atomic_or_16_nv(volatile uint16_t *, uint16_t);
 166 extern ushort_t atomic_or_ushort_nv(volatile ushort_t *, ushort_t);
 167 extern uint32_t atomic_or_32_nv(volatile uint32_t *, uint32_t);
 168 extern uint_t atomic_or_uint_nv(volatile uint_t *, uint_t);
 169 extern ulong_t atomic_or_ulong_nv(volatile ulong_t *, ulong_t);
 170 #if defined(_INT64_TYPE)
 171 extern uint64_t atomic_or_64_nv(volatile uint64_t *, uint64_t);
 172 #endif
 173
 174 /*
 175  * logical AND bits with target and return new value.
 176  */
 177 extern uint8_t atomic_and_8_nv(volatile uint8_t *, uint8_t);
 178 extern uchar_t atomic_and_uchar_nv(volatile uchar_t *, uchar_t);
 179 extern uint16_t atomic_and_16_nv(volatile uint16_t *, uint16_t);
 180 extern ushort_t atomic_and_ushort_nv(volatile ushort_t *, ushort_t);
 181 extern uint32_t atomic_and_32_nv(volatile uint32_t *, uint32_t);
 182 extern uint_t atomic_and_uint_nv(volatile uint_t *, uint_t);
 183 extern ulong_t atomic_and_ulong_nv(volatile ulong_t *, ulong_t);
 184 #if defined(_INT64_TYPE)
 185 extern uint64_t atomic_and_64_nv(volatile uint64_t *, uint64_t);
 186 #endif
 187
 188 /*
 189  * If *arg1 == arg2, set *arg1 = arg3; return old value
 190  */
 191 extern uint8_t atomic_cas_8(volatile uint8_t *, uint8_t, uint8_t);
 192 extern uchar_t atomic_cas_uchar(volatile uchar_t *, uchar_t, uchar_t);
 193 extern uint16_t atomic_cas_16(volatile uint16_t *, uint16_t, uint16_t);
 194 extern ushort_t atomic_cas_ushort(volatile ushort_t *, ushort_t, ushort_t);
 195 extern uint32_t atomic_cas_32(volatile uint32_t *, uint32_t, uint32_t);
 196 extern uint_t atomic_cas_uint(volatile uint_t *, uint_t, uint_t);
 197 extern void *atomic_cas_ptr(volatile void *, void *, void *);
 198 extern ulong_t atomic_cas_ulong(volatile ulong_t *, ulong_t, ulong_t);
 199 #if defined(_INT64_TYPE)
 200 extern uint64_t atomic_cas_64(volatile uint64_t *, uint64_t, uint64_t);
 201 #endif
 202
 203 /*
 204  * Swap target and return old value
 205  */
 206 extern uint8_t atomic_swap_8(volatile uint8_t *, uint8_t);
 207 extern uchar_t atomic_swap_uchar(volatile uchar_t *, uchar_t);
 208 extern uint16_t atomic_swap_16(volatile uint16_t *, uint16_t);
 209 extern ushort_t atomic_swap_ushort(volatile ushort_t *, ushort_t);
 210 extern uint32_t atomic_swap_32(volatile uint32_t *, uint32_t);
 211 extern uint_t atomic_swap_uint(volatile uint_t *, uint_t);
 212 extern void *atomic_swap_ptr(volatile void *, void *);
 213 extern ulong_t atomic_swap_ulong(volatile ulong_t *, ulong_t);
 214 #if defined(_INT64_TYPE)
 215 extern uint64_t atomic_swap_64(volatile uint64_t *, uint64_t);
 216 #endif
 217
 218 /*
 219  * Perform an exclusive atomic bit set/clear on a target.
 220  * Returns 0 if bit was sucessfully set/cleared, or -1
 221  * if the bit was already set/cleared.
 222  */
 223 extern int atomic_set_long_excl(volatile ulong_t *, uint_t);
 224 extern int atomic_clear_long_excl(volatile ulong_t *, uint_t);
 225
 226 /*
 227  * Generic memory barrier used during lock entry, placed after the
 228  * memory operation that acquires the lock to guarantee that the lock
 229  * protects its data.  No stores from after the memory barrier will
 230  * reach visibility, and no loads from after the barrier will be
 231  * resolved, before the lock acquisition reaches global visibility.
 232  */
 233 extern void membar_enter(void);
 234
 235 /*
 236  * Generic memory barrier used during lock exit, placed before the
 237  * memory operation that releases the lock to guarantee that the lock
 238  * protects its data.  All loads and stores issued before the barrier
 239  * will be resolved before the subsequent lock update reaches visibility.
 240  */
 241 extern void membar_exit(void);
 242
 243 /*
 244  * Arrange that all stores issued before this point in the code reach
 245  * global visibility before any stores that follow; useful in producer
 246  * modules that update a data item, then set a flag that it is available.
 247  * The memory barrier guarantees that the available flag is not visible
 248  * earlier than the updated data, i.e. it imposes store ordering.
 249  */
 250 extern void membar_producer(void);
 251
 252 /*
 253  * Arrange that all loads issued before this point in the code are
 254  * completed before any subsequent loads; useful in consumer modules
 255  * that check to see if data is available and read the data.
 256  * The memory barrier guarantees that the data is not sampled until
 257  * after the available flag has been seen, i.e. it imposes load ordering.
 258  */
 259 extern void membar_consumer(void);
 260 #endif  /* __STDC__ */
 261
 262 #ifdef  __cplusplus
 263 }
 264 #endif
 265
 266 #endif  /* _SYS_ATOMIC_H */