dispatch-1.0/src/shims/perfmon.h

   1 /*
   2  * Copyright (c) 2008-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_APACHE_LICENSE_HEADER_START@
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * @APPLE_APACHE_LICENSE_HEADER_END@
  19  */
  20
  21 /*
  22  * IMPORTANT: This header file describes INTERNAL interfaces to libdispatch
  23  * which are subject to change in future releases of Mac OS X. Any applications
  24  * relying on these interfaces WILL break.
  25  */
  26
  27 #ifndef __DISPATCH_SHIMS_PERFMON__
  28 #define __DISPATCH_SHIMS_PERFMON__
  29
  30 #if DISPATCH_PERF_MON
  31
  32 #if defined (USE_APPLE_TSD_OPTIMIZATIONS) && defined(SIMULATE_5491082) && (defined(__i386__) || defined(__x86_64__))
  33 #ifdef __LP64__
  34 #define _dispatch_workitem_inc()        asm("incq %%gs:%0" : "+m"       \
  35                 (*(void **)(dispatch_bcounter_key * sizeof(void *) + _PTHREAD_TSD_OFFSET)) :: "cc")
  36 #define _dispatch_workitem_dec()        asm("decq %%gs:%0" : "+m"       \
  37                 (*(void **)(dispatch_bcounter_key * sizeof(void *) + _PTHREAD_TSD_OFFSET)) :: "cc")
  38 #else
  39 #define _dispatch_workitem_inc()        asm("incl %%gs:%0" : "+m"       \
  40                 (*(void **)(dispatch_bcounter_key * sizeof(void *) + _PTHREAD_TSD_OFFSET)) :: "cc")
  41 #define _dispatch_workitem_dec()        asm("decl %%gs:%0" : "+m"       \
  42                 (*(void **)(dispatch_bcounter_key * sizeof(void *) + _PTHREAD_TSD_OFFSET)) :: "cc")
  43 #endif
  44 #else /* !USE_APPLE_TSD_OPTIMIZATIONS */
  45 static inline void
  46 _dispatch_workitem_inc(void)
  47 {
  48         unsigned long cnt = (unsigned long)_dispatch_thread_getspecific(dispatch_bcounter_key);
  49         _dispatch_thread_setspecific(dispatch_bcounter_key, (void *)++cnt);
  50 }
  51 static inline void
  52 _dispatch_workitem_dec(void)
  53 {
  54         unsigned long cnt = (unsigned long)_dispatch_thread_getspecific(dispatch_bcounter_key);
  55         _dispatch_thread_setspecific(dispatch_bcounter_key, (void *)--cnt);
  56 }
  57 #endif /* USE_APPLE_TSD_OPTIMIZATIONS */
  58
  59 // C99 doesn't define flsll() or ffsll()
  60 #ifdef __LP64__
  61 #define flsll(x) flsl(x)
  62 #else
  63 static inline unsigned int
  64 flsll(uint64_t val)
  65 {
  66         union {
  67                 struct {
  68 #ifdef __BIG_ENDIAN__
  69                         unsigned int hi, low;
  70 #else
  71                         unsigned int low, hi;
  72 #endif
  73                 } words;
  74                 uint64_t word;
  75         } _bucket = {
  76                 .word = val,
  77         };
  78         if (_bucket.words.hi) {
  79                 return fls(_bucket.words.hi) + 32;
  80         }
  81         return fls(_bucket.words.low);
  82 }
  83 #endif
  84
  85 #else
  86 #define _dispatch_workitem_inc()
  87 #define _dispatch_workitem_dec()
  88 #endif  // DISPATCH_PERF_MON
  89
  90 #endif /* __DISPATCH_SHIMS_PERFMON__ */