Merge pull request #256 from apple/revert-255-revert-254-das-darwin-libdispatch-890-merge-master

Re-merge darwin/libdispatch-890 to master

Author: das

INSTALL.md

@@ -87,11 +87,6 @@ Specify the path to Apple's libpthread package, so that appropriate headers
 Specify the path to Apple's libplatform package, so that appropriate headers
 	can be found and used.
 
-`--with-apple-libclosure-source`
-
-Specify the path to Apple's Libclosure package, so that appropriate headers
-	can be found and used.
-
 `--with-apple-xnu-source`
 
 Specify the path to Apple's XNU package, so that appropriate headers can be
@@ -104,11 +99,6 @@ On systems where -fblocks is supported, specify an additional library path in wh
 The following options are likely to only be useful when building libdispatch on
 OS X as a replacement for /usr/lib/system/libdispatch.dylib:
 
-`--with-apple-objc4-source`
-
-Specify the path to Apple's objc4 package, so that appropriate headers can
-	be found and used.
-
 `--disable-libdispatch-init-constructor`
 
 Do not tag libdispatch's init routine as __constructor, in which case it must be run manually before libdispatch routines can be called. This is the default when building on OS X. For /usr/lib/system/libdispatch.dylib the init routine is called automatically during process start.
@@ -131,9 +121,7 @@ libdispatch for /usr/lib/system on OS X El Capitan:
 		--enable-apple-tsd-optimizations \
 		--with-apple-libpthread-source=/path/to/10.11.0/libpthread-137.1.1 \
 		--with-apple-libplatform-source=/path/to/10.11.0/libplatform-73.1.1 \
-		--with-apple-libclosure-source=/path/to/10.11.0/libclosure-65 \
 		--with-apple-xnu-source=/path/to/10.11.0/xnu-3247.1.106 \
-		--with-apple-objc4-source=/path/to/10.11.0/objc4-680
 	make check
 
 ### Building and installing for FreeBSD

configure.ac

@@ -125,13 +125,6 @@ AC_ARG_WITH([apple-libplatform-source],
   CPPFLAGS="$CPPFLAGS -isystem $apple_libplatform_source_include_path"
 ])
 
-AC_ARG_WITH([apple-libclosure-source],
-  [AS_HELP_STRING([--with-apple-libclosure-source],
-    [Specify path to Apple libclosure source])], [
-  apple_libclosure_source_path=${withval}
-  CPPFLAGS="$CPPFLAGS -isystem $apple_libclosure_source_path"
-])
-
 AC_ARG_WITH([apple-xnu-source],
   [AS_HELP_STRING([--with-apple-xnu-source],
     [Specify path to Apple XNU source])], [
@@ -143,12 +136,6 @@ AC_ARG_WITH([apple-xnu-source],
   CPPFLAGS="$CPPFLAGS -idirafter $apple_xnu_source_libkern_path -isystem $apple_xnu_source_bsd_path -isystem $apple_xnu_source_libsyscall_path -isystem $apple_xnu_source_libproc_path "
 ])
 
-AC_ARG_WITH([apple-objc4-source],
-  [AS_HELP_STRING([--with-apple-objc4-source],
-    [Specify path to Apple objc4 source])], [
-  apple_objc4_source_runtime_path=${withval}/runtime
-])
-
 AC_CACHE_CHECK([for System.framework/PrivateHeaders], dispatch_cv_system_privateheaders,
   [AS_IF([test -d /System/Library/Frameworks/System.framework/PrivateHeaders],
     [dispatch_cv_system_privateheaders=yes], [dispatch_cv_system_privateheaders=no])]
@@ -387,24 +374,10 @@ AC_CHECK_HEADER([Foundation/Foundation.h],
   [have_foundation=true], [have_foundation=false]
 )
 AM_CONDITIONAL(HAVE_FOUNDATION, $have_foundation)
-# hack for objc4/runtime/objc-internal.h
-AS_IF([test -n "$apple_objc4_source_runtime_path"], [
-  saveCPPFLAGS="$CPPFLAGS"
-  CPPFLAGS="$CPPFLAGS -I."
-  ln -fsh "$apple_objc4_source_runtime_path" objc
-])
-AC_CHECK_HEADER([objc/objc-internal.h], [
+AC_CHECK_HEADER([objc/NSObject.h], [
   AC_DEFINE(HAVE_OBJC, 1, [Define if you have the Objective-C runtime])
-  have_objc=true], [have_objc=false],
-  [#include <objc/runtime.h>]
+  have_objc=true], [have_objc=false]
 )
-AS_IF([test -n "$apple_objc4_source_runtime_path"], [
-  rm -f objc
-  CPPFLAGS="$saveCPPFLAGS"
-  AC_CONFIG_COMMANDS([src/objc],
-    [ln -fsh "$apple_objc4_source_runtime_path" src/objc],
-    [apple_objc4_source_runtime_path="$apple_objc4_source_runtime_path"])
-])
 AM_CONDITIONAL(USE_OBJC, $have_objc)
 AC_LANG_POP([Objective C])
 
@@ -443,7 +416,10 @@ AC_CHECK_FUNC([sem_init],
   [have_sem_init=true], [have_sem_init=false]
 )
 
-AC_CHECK_HEADER(linux/futex.h, [have_futex=true], [have_futex=false])
+AC_CHECK_HEADER([linux/futex.h], [
+  AC_DEFINE(HAVE_FUTEX, 1, [Define if linux/futex.h is present])
+  have_futex=true], [have_futex=false]
+)
 
 #
 # We support both Mach semaphores and POSIX semaphores; if the former are

dispatch/dispatch.h

@@ -23,6 +23,7 @@
 
 #ifdef __APPLE__
 #include <Availability.h>
+#include <os/availability.h>
 #include <TargetConditionals.h>
 #include <os/base.h>
 #elif defined(__linux__)
@@ -47,7 +48,7 @@
 #endif
 #endif
 
-#define DISPATCH_API_VERSION 20160831
+#define DISPATCH_API_VERSION 20170124
 
 #ifndef __DISPATCH_BUILDING_DISPATCH__
 

dispatch/queue.h

@@ -206,15 +206,49 @@ dispatch_sync_f(dispatch_queue_t queue,
 	void *_Nullable context,
 	dispatch_function_t work);
 
+
+#if !defined(__APPLE__) || TARGET_OS_WATCH || TARGET_OS_TV || \
+		(defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && \
+		__IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_7_0) || \
+		(defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && \
+		__MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_9)
+#define DISPATCH_APPLY_AUTO_AVAILABLE 1
+#else
+#define DISPATCH_APPLY_AUTO_AVAILABLE 0
+#endif
+
+/*!
+ * @constant DISPATCH_APPLY_AUTO
+ *
+ * @abstract
+ * Constant to pass to dispatch_apply() or dispatch_apply_f() to request that
+ * the system automatically use worker threads that match the configuration of
+ * the current thread most closely.
+ *
+ * @discussion
+ * When submitting a block for parallel invocation, passing this constant as the
+ * queue argument will automatically use the global concurrent queue that
+ * matches the Quality of Service of the caller most closely.
+ *
+ * No assumptions should be made about which global concurrent queue will
+ * actually be used.
+ *
+ * Using this constant deploys backward to macOS 10.9, iOS 7.0 and any tvOS or
+ * watchOS version.
+ */
+#if DISPATCH_APPLY_AUTO_AVAILABLE
+#define DISPATCH_APPLY_AUTO ((dispatch_queue_t _Nonnull)0)
+#endif
+
 /*!
  * @function dispatch_apply
  *
  * @abstract
- * Submits a block to a dispatch queue for multiple invocations.
+ * Submits a block to a dispatch queue for parallel invocation.
  *
  * @discussion
- * Submits a block to a dispatch queue for multiple invocations. This function
- * waits for the task block to complete before returning. If the target queue
+ * Submits a block to a dispatch queue for parallel invocation. This function
+ * waits for the task block to complete before returning. If the specified queue
  * is concurrent, the block may be invoked concurrently, and it must therefore
  * be reentrant safe.
  *
@@ -224,8 +258,9 @@ dispatch_sync_f(dispatch_queue_t queue,
  * The number of iterations to perform.
  *
  * @param queue
- * The target dispatch queue to which the block is submitted.
- * The result of passing NULL in this parameter is undefined.
+ * The dispatch queue to which the block is submitted.
+ * The preferred value to pass is DISPATCH_APPLY_AUTO to automatically use
+ * a queue appropriate for the calling thread.
  *
  * @param block
  * The block to be invoked the specified number of iterations.
@@ -243,7 +278,7 @@ dispatch_apply(size_t iterations, dispatch_queue_t queue,
  * @function dispatch_apply_f
  *
  * @abstract
- * Submits a function to a dispatch queue for multiple invocations.
+ * Submits a function to a dispatch queue for parallel invocation.
  *
  * @discussion
  * See dispatch_apply() for details.
@@ -252,14 +287,15 @@ dispatch_apply(size_t iterations, dispatch_queue_t queue,
  * The number of iterations to perform.
  *
  * @param queue
- * The target dispatch queue to which the function is submitted.
- * The result of passing NULL in this parameter is undefined.
+ * The dispatch queue to which the function is submitted.
+ * The preferred value to pass is DISPATCH_APPLY_AUTO to automatically use
+ * a queue appropriate for the calling thread.
  *
  * @param context
  * The application-defined context parameter to pass to the function.
  *
  * @param work
- * The application-defined function to invoke on the target queue. The first
+ * The application-defined function to invoke on the specified queue. The first
  * parameter passed to this function is the context provided to
  * dispatch_apply_f(). The second parameter passed to this function is the
  * current index of iteration.