libdispatch now builds on Linux and ping/pong test runs successfully.

.gitignore

@@ -16,3 +16,16 @@ project.xcworkspace
 Build
 .build
 
+# build files generated by autotools
+Makefile
+Makefile.in
+config.log
+configure
+aclocal.m4
+autom4te.cache
+config.log
+config.status
+config
+configure
+libtool
+

configure.ac

@@ -297,15 +297,17 @@ AS_IF([test "x$dispatch_cv_cc_omit_leaf_fp" != "xno"], [
 ])
 AC_SUBST([OMIT_LEAF_FP_FLAGS])
 
-AC_CACHE_CHECK([for darwin linker], [dispatch_cv_ld_darwin], [
-  saveLDFLAGS="$LDFLAGS"
-  LDFLAGS="$LDFLAGS -dynamiclib -compatibility_version 1.2.3 -current_version 4.5.6 -dead_strip"
-  AC_LINK_IFELSE([AC_LANG_PROGRAM([
-    extern int foo; int foo;], [foo = 0;])],
-    [dispatch_cv_ld_darwin="yes"], [dispatch_cv_ld_darwin="no"])
-  LDFLAGS="$saveLDFLAGS"
+AS_IF([test "x$have_mach" = "xtrue"], [
+  AC_CACHE_CHECK([for darwin linker], [dispatch_cv_ld_darwin], [
+    saveLDFLAGS="$LDFLAGS"
+    LDFLAGS="$LDFLAGS -dynamiclib -compatibility_version 1.2.3 -current_version 4.5.6 -dead_strip"
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([
+      extern int foo; int foo;], [foo = 0;])],
+      [dispatch_cv_ld_darwin="yes"], [dispatch_cv_ld_darwin="no"])
+    LDFLAGS="$saveLDFLAGS"
+  ])
 ])
-AM_CONDITIONAL(HAVE_DARWIN_LD, [test "x$dispatch_cv_ld_darwin" != "xno"])
+AM_CONDITIONAL(HAVE_DARWIN_LD, [test "x$dispatch_cv_ld_darwin" == "xyes"])
 
 #
 # Temporary: some versions of clang do not mark __builtin_trap() as

m4/.gitignore

@@ -0,0 +1,5 @@
+libtool.m4
+ltoptions.m4
+ltsugar.m4
+ltversion.m4
+lt~obsolete.m4

os/Makefile.am

@@ -5,7 +5,8 @@
 osdir=$(includedir)/os
 
 os_HEADERS=	\
-	object.h
+	object.h \
+	linux_base.h
 
 noinst_HEADERS=	\
 	object_private.h

os/linux_base.h

@@ -0,0 +1,142 @@
+/*
+ * @APPLE_APACHE_LICENSE_HEADER_START@
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @APPLE_APACHE_LICENSE_HEADER_END@
+ */
+
+#ifndef __OS_LINUX_BASE__
+#define __OS_LINUX_BASE__
+
+// #include <sys/event.h>
+
+// marker for hacks we have made to make progress
+#define __LINUX_PORT_HDD__ 1 
+
+/*
+ * Stub out defines for some mach types and related macros
+ */
+
+typedef uint32_t mach_port_t;
+
+#define  MACH_PORT_NULL (0)
+#define  MACH_PORT_DEAD (-1)
+
+#define EVFILT_MACHPORT (-8)
+
+typedef uint32_t mach_error_t;
+
+typedef uint32_t mach_vm_size_t;
+
+typedef uint32_t mach_msg_return_t;
+
+typedef uintptr_t mach_vm_address_t;
+
+typedef uint32_t dispatch_mach_msg_t;
+
+typedef uint32_t dispatch_mach_t;
+
+typedef uint32_t dispatch_mach_reason_t;
+
+typedef uint32_t voucher_activity_mode_t;
+
+typedef uint32_t voucher_activity_trace_id_t;
+
+typedef uint32_t voucher_activity_id_t;
+
+typedef uint32_t _voucher_activity_buffer_hook_t;;
+
+typedef uint32_t voucher_activity_flag_t;
+
+typedef struct
+{
+} mach_msg_header_t;
+
+
+typedef void (*dispatch_mach_handler_function_t)(void*, dispatch_mach_reason_t,
+						 dispatch_mach_msg_t, mach_error_t);
+
+typedef void (*dispatch_mach_msg_destructor_t)(void*);
+
+typedef uint32_t voucher_activity_mode_t;
+
+struct voucher_offsets_s {
+  uint32_t vo_version;
+};
+
+
+/*
+ * Stub out defines for other missing types
+ */
+
+// Pulled from OS X man page for kevent
+struct kevent64_s {
+    uint64_t        ident;          /* identifier for this event */
+    int16_t         filter;         /* filter for event */
+    uint16_t        flags;          /* general flags */
+    uint32_t        fflags;         /* filter-specific flags */
+    int64_t         data;           /* filter-specific data */
+    uint64_t        udata;          /* opaque user data identifier */
+    uint64_t        ext[2];         /* filter-specific extensions */
+};
+
+
+// PAGE_SIZE and SIZE_T_MAX should not be hardcoded like this here.
+#define PAGE_SIZE (4096)
+#define SIZE_T_MAX (0x7fffffff)
+
+// Define to 0 the NOTE_ values that are not present on Linux.
+// Revisit this...would it be better to ifdef out the uses instead??
+#define NOTE_VM_PRESSURE 0
+#define NOTE_ABSOLUTE 0
+#define NOTE_NSECONDS 0
+#define NOTE_LEEWAY 0
+#define NOTE_CRITICAL 0
+#define NOTE_BACKGROUND 0
+
+/*
+ * Stub out misc linking and compilation attributes
+ */
+
+#ifdef OS_EXPORT
+#undef OS_EXPORT
+#endif
+#define OS_EXPORT
+
+#ifdef OS_WARN_RESULT_NEEDS_RELEASE 
+#undef OS_WARN_RESULT_NEEDS_RELEASE  
+#endif
+
+#ifdef OS_WARN_RESULT
+#undef OS_WARN_RESULT
+#endif
+#define OS_WARN_RESULT
+
+#ifdef OS_NOTHROW
+#undef OS_NOTHROW
+#endif
+#define OS_NOTHROW
+
+
+// These and similar macros come from Availabilty.h on OS X
+// Need a better way to do this long term.
+#define __OSX_AVAILABLE_BUT_DEPRECATED(a,b,c,d) //
+#define __OSX_AVAILABLE_BUT_DEPRECATED_MSG(a,b,c,d,msg) // 
+
+
+// Print a warning when an unported code path executes.
+#define LINUX_PORT_ERROR()  do { printf("LINUX_PORT_ERROR_CALLED %s:%d: %s\n",__FILE__,__LINE__,__FUNCTION__); } while (0)
+
+
+#endif /* __OS_LINUX_BASE__ */

os/object.h

@@ -24,7 +24,11 @@
 #ifdef __APPLE__
 #include <Availability.h>
 #endif
+#ifndef __linux__
 #include <os/base.h>
+#else
+#include <os/linux_base.h>
+#endif
 
 /*!
  * @header

private/voucher_activity_private.h

@@ -21,7 +21,9 @@
 #ifndef __OS_VOUCHER_ACTIVITY_PRIVATE__
 #define __OS_VOUCHER_ACTIVITY_PRIVATE__
 
+#ifndef __linux__
 #include <os/base.h>
+#endif
 #include <os/object.h>
 #if !defined(__DISPATCH_BUILDING_DISPATCH__)
 #include <os/voucher_private.h>

private/voucher_private.h

@@ -21,7 +21,9 @@
 #ifndef __OS_VOUCHER_PRIVATE__
 #define __OS_VOUCHER_PRIVATE__
 
+#ifndef __linux__
 #include <os/base.h>
+#endif
 #include <os/object.h>
 
 #define OS_VOUCHER_SPI_VERSION 20141203
@@ -400,7 +402,9 @@ dispatch_queue_create_with_accounting_override_voucher(const char *label,
  * voucher ports directly.
  */
 
+#ifdef __APPLE__
 #include <mach/mach.h>
+#endif
 
 /*!
  * @function voucher_create_with_mach_msg

src/.gitignore

@@ -0,0 +1,5 @@
+provider.h
+.libs
+*.lo
+*.la
+

src/Makefile.am

@@ -39,6 +39,8 @@ libdispatch_la_SOURCES=		\
 	shims/atomic_sfb.h		\
 	shims/getprogname.h		\
 	shims/hw_config.h		\
+	shims/linux_stubs.c		\
+	shims/linux_stubs.h		\
 	shims/perfmon.h			\
 	shims/time.h			\
 	shims/tsd.h				\

src/init.c

@@ -162,7 +162,9 @@ const struct dispatch_tsd_indexes_s dispatch_tsd_indexes = {
 	.dti_qos_class_index = dispatch_priority_key,
 };
 #else // DISPATCH_USE_DIRECT_TSD
+#ifndef __LINUX_PORT_HDD__
 #error Not implemented on this platform
+#endif
 #endif // DISPATCH_USE_DIRECT_TSD
 
 // 6618342 Contact the team that owns the Instrument DTrace probe before
@@ -1157,7 +1159,10 @@ const struct dispatch_source_type_s _dispatch_source_type_vnode = {
 		.flags = EV_CLEAR|EV_UDATA_SPECIFIC,
 	},
 	.mask = NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|NOTE_LINK|
-			NOTE_RENAME|NOTE_REVOKE
+			NOTE_RENAME
+#if HAVE_DECL_NOTE_REVOKE
+	                |NOTE_REVOKE
+#endif
 #if HAVE_DECL_NOTE_NONE
 			|NOTE_NONE
 #endif

src/internal.h

@@ -208,7 +208,11 @@ DISPATCH_EXPORT DISPATCH_NOTHROW void dispatch_atfork_child(void);
 #if !TARGET_OS_WIN32 
 #include <sys/event.h>
 #include <sys/mount.h>
+#ifdef __linux__
+#include <shims/sys_queue.h>
+#else
 #include <sys/queue.h>
+#endif
 #include <sys/sysctl.h>
 #include <sys/socket.h>
 #include <sys/time.h>

src/io.c

@@ -387,9 +387,11 @@ dispatch_io_create_with_path(dispatch_io_type_t type, const char *path,
 		int err = 0;
 		struct stat st;
 		_dispatch_io_syscall_switch_noerr(err,
-			(path_data->oflag & O_NOFOLLOW) == O_NOFOLLOW ||
-					(path_data->oflag & O_SYMLINK) == O_SYMLINK ?
-					lstat(path_data->path, &st) : stat(path_data->path, &st),
+			(path_data->oflag & O_NOFOLLOW) == O_NOFOLLOW
+#ifndef __linux__
+					|| (path_data->oflag & O_SYMLINK) == O_SYMLINK
+#endif						  
+					? lstat(path_data->path, &st) : stat(path_data->path, &st),
 			case 0:
 				err = _dispatch_io_validate_type(channel, st.st_mode);
 				break;
@@ -2064,6 +2066,9 @@ _dispatch_disk_perform(void *ctxt)
 static void
 _dispatch_operation_advise(dispatch_operation_t op, size_t chunk_size)
 {
+#ifndef F_RDADVISE
+  LINUX_PORT_ERROR();
+#else
 	int err;
 	struct radvisory advise;
 	// No point in issuing a read advise for the next chunk if we are already
@@ -2090,6 +2095,7 @@ _dispatch_operation_advise(dispatch_operation_t op, size_t chunk_size)
 		// TODO: set disk status on error
 		default: (void)dispatch_assume_zero(err); break;
 	);
+#endif	
 }
 
 static int