src/shims.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_OS_SHIMS__
  28 #define __DISPATCH_OS_SHIMS__
  29
  30 #include <pthread.h>
  31 #if HAVE_PTHREAD_WORKQUEUES
  32 #include <pthread_workqueue.h>
  33 #endif
  34 #if HAVE_PTHREAD_NP_H
  35 #include <pthread_np.h>
  36 #endif
  37
  38 #if !HAVE_DECL_FD_COPY
  39 #define FD_COPY(f, t) (void)(*(t) = *(f))
  40 #endif
  41
  42 #if TARGET_OS_WIN32
  43 #define bzero(ptr,len) memset((ptr), 0, (len))
  44 #define snprintf _snprintf
  45
  46 inline size_t strlcpy(char *dst, const char *src, size_t size) {
  47         int res = strlen(dst) + strlen(src) + 1;
  48         if (size > 0) {
  49                 size_t n = size - 1;
  50                 strncpy(dst, src, n);
  51                 dst[n] = 0;
  52         }
  53         return res;
  54 }
  55 #endif // TARGET_OS_WIN32
  56
  57 #if !HAVE_NORETURN_BUILTIN_TRAP
  58 /*
  59  * XXXRW: Work-around for possible clang bug in which __builtin_trap() is not
  60  * marked noreturn, leading to a build error as dispatch_main() *is* marked
  61  * noreturn. Mask by marking __builtin_trap() as noreturn locally.
  62  */
  63 DISPATCH_NORETURN
  64 void __builtin_trap(void);
  65 #endif
  66
  67 #if DISPATCH_HW_CONFIG_UP
  68 #define DISPATCH_ATOMIC_UP 1
  69 #endif
  70
  71 #include "shims/atomic.h"
  72 #include "shims/atomic_sfb.h"
  73 #include "shims/tsd.h"
  74 #include "shims/hw_config.h"
  75 #include "shims/perfmon.h"
  76
  77 #include "shims/getprogname.h"
  78 #include "shims/time.h"
  79
  80 #ifdef __APPLE__
  81 // Clear the stack before calling long-running thread-handler functions that
  82 // never return (and don't take arguments), to facilitate leak detection and
  83 // provide cleaner backtraces. <rdar://problem/9050566>
  84 #define _dispatch_clear_stack(s) do { \
  85                 void *a[(s)/sizeof(void*) ? (s)/sizeof(void*) : 1]; \
  86                 a[0] = pthread_get_stackaddr_np(pthread_self()); \
  87                 bzero((void*)&a[1], (size_t)(a[0] - (void*)&a[1])); \
  88         } while (0)
  89 #else
  90 #define _dispatch_clear_stack(s)
  91 #endif
  92
  93 #endif