src/shims/perfmon.h

   1 /*
   2  * Copyright (c) 2008-2013 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) && \
  33                 (defined(__i386__) || defined(__x86_64__))
  34 #ifdef __LP64__
  35 #define _dispatch_perfmon_workitem_inc() asm("incq %%gs:%0" : "+m" \
  36                 (*(void **)(dispatch_bcounter_key * sizeof(void *) + \
  37                 _PTHREAD_TSD_OFFSET)) :: "cc")
  38 #define _dispatch_perfmon_workitem_dec() asm("decq %%gs:%0" : "+m" \
  39                 (*(void **)(dispatch_bcounter_key * sizeof(void *) + \
  40                 _PTHREAD_TSD_OFFSET)) :: "cc")
  41 #else
  42 #define _dispatch_perfmon_workitem_inc() asm("incl %%gs:%0" : "+m" \
  43                 (*(void **)(dispatch_bcounter_key * sizeof(void *) + \
  44                 _PTHREAD_TSD_OFFSET)) :: "cc")
  45 #define _dispatch_perfmon_workitem_dec() asm("decl %%gs:%0" : "+m" \
  46                 (*(void **)(dispatch_bcounter_key * sizeof(void *) + \
  47                 _PTHREAD_TSD_OFFSET)) :: "cc")
  48 #endif
  49 #else /* !USE_APPLE_TSD_OPTIMIZATIONS */
  50 static inline void
  51 _dispatch_perfmon_workitem_inc(void)
  52 {
  53         unsigned long cnt;
  54         cnt = (unsigned long)_dispatch_thread_getspecific(dispatch_bcounter_key);
  55         _dispatch_thread_setspecific(dispatch_bcounter_key, (void *)++cnt);
  56 }
  57 static inline void
  58 _dispatch_perfmon_workitem_dec(void)
  59 {
  60         unsigned long cnt;
  61         cnt = (unsigned long)_dispatch_thread_getspecific(dispatch_bcounter_key);
  62         _dispatch_thread_setspecific(dispatch_bcounter_key, (void *)--cnt);
  63 }
  64 #endif /* USE_APPLE_TSD_OPTIMIZATIONS */
  65
  66 // C99 doesn't define flsll() or ffsll()
  67 #ifdef __LP64__
  68 #define flsll(x) flsl(x)
  69 #else
  70 static inline unsigned int
  71 flsll(uint64_t val)
  72 {
  73         union {
  74                 struct {
  75 #ifdef __BIG_ENDIAN__
  76                         unsigned int hi, low;
  77 #else
  78                         unsigned int low, hi;
  79 #endif
  80                 } words;
  81                 uint64_t word;
  82         } _bucket = {
  83                 .word = val,
  84         };
  85         if (_bucket.words.hi) {
  86                 return fls(_bucket.words.hi) + 32;
  87         }
  88         return fls(_bucket.words.low);
  89 }
  90 #endif
  91
  92 #define _dispatch_perfmon_start() \
  93                 uint64_t start = _dispatch_absolute_time()
  94 #define _dispatch_perfmon_end() \
  95                 _dispatch_queue_merge_stats(start)
  96 #else
  97
  98 #define _dispatch_perfmon_workitem_inc()
  99 #define _dispatch_perfmon_workitem_dec()
 100 #define _dispatch_perfmon_start()
 101 #define _dispatch_perfmon_end()
 102
 103 #endif // DISPATCH_PERF_MON
 104
 105 #endif