dispatch: exclude workgroup support on non-Apple targets

Follow the advice from @MadCoder and limit workgroup headers to Apple
targets only.  This is required to restore the ability to build dispatch
on other platforms.

Author: compnerd

dispatch/dispatch.h

@@ -62,7 +62,9 @@
 #endif
 
 #include <os/object.h>
+#if HAVE_MACH
 #include <os/workgroup.h>
+#endif
 #include <dispatch/base.h>
 #include <dispatch/time.h>
 #include <dispatch/object.h>

dispatch/workloop.h

@@ -133,6 +133,7 @@ void
 dispatch_workloop_set_autorelease_frequency(dispatch_workloop_t workloop,
 		dispatch_autorelease_frequency_t frequency);
 
+#if HAVE_MACH
 /*!
   * @function dispatch_workloop_set_os_workgroup
   *
@@ -159,6 +160,7 @@ DISPATCH_EXPORT DISPATCH_NONNULL_ALL DISPATCH_NOTHROW
 void
 dispatch_workloop_set_os_workgroup(dispatch_workloop_t workloop,
 		os_workgroup_t workgroup);
+#endif
 
 __END_DECLS
 

os/eventlink_private.h

@@ -1,8 +1,11 @@
 #ifndef __OS_EVENTLINK__
 #define __OS_EVENTLINK__
 
-#include <os/object.h>
+#if HAVE_MACH
 #include <mach/mach.h>
+#endif
+
+#include <os/object.h>
 #include <os/clock.h>
 
 __BEGIN_DECLS

src/internal.h

@@ -219,10 +219,12 @@ upcast(dispatch_object_t dou)
 #endif // __OBJC__
 
 #include <os/object.h>
+#if HAVE_MACH
 #include <os/workgroup_base.h>
 #include <os/workgroup_object.h>
 #include <os/workgroup_interval.h>
 #include <os/workgroup_parallel.h>
+#endif
 #include <dispatch/time.h>
 #include <dispatch/object.h>
 #include <dispatch/queue.h>
@@ -241,8 +243,10 @@ upcast(dispatch_object_t dou)
 #endif
 #include "os/object_private.h"
 #include "os/eventlink_private.h"
+#if HAVE_MACH
 #include "os/workgroup_object_private.h"
 #include "os/workgroup_interval_private.h"
+#endif
 #include "apply_private.h"
 #include "queue_private.h"
 #include "channel_private.h"
@@ -1180,7 +1184,9 @@ extern bool _dispatch_kevent_workqueue_enabled;
 
 /* #includes dependent on internal.h */
 #include "object_internal.h"
+#if HAVE_MACH
 #include "workgroup_internal.h"
+#endif
 #include "eventlink_internal.h"
 #include "semaphore_internal.h"
 #include "introspection_internal.h"

src/queue.c

@@ -4056,9 +4056,11 @@ static void
 _dispatch_workloop_attributes_dispose(dispatch_workloop_t dwl)
 {
 	if (dwl->dwl_attr) {
+#if HAVE_MACH
 		if (dwl->dwl_attr->workgroup) {
 			_os_object_release(dwl->dwl_attr->workgroup->_as_os_obj);
 		}
+#endif
 		free(dwl->dwl_attr);
 	}
 }
@@ -4127,6 +4129,7 @@ dispatch_workloop_set_qos_class_floor(dispatch_workloop_t dwl,
 #endif // TARGET_OS_MAC
 }
 
+#if HAVE_MACH
 void
 dispatch_workloop_set_os_workgroup(dispatch_workloop_t dwl, os_workgroup_t wg)
 {
@@ -4142,6 +4145,7 @@ dispatch_workloop_set_os_workgroup(dispatch_workloop_t dwl, os_workgroup_t wg)
 	_os_object_retain(wg->_as_os_obj);
 	dwl->dwl_attr->workgroup = wg;
 }
+#endif
 
 void
 dispatch_workloop_set_qos_class(dispatch_workloop_t dwl,

src/queue_internal.h

@@ -482,7 +482,9 @@ typedef struct dispatch_workloop_attr_s {
 		uint8_t percent;
 		uint32_t refillms;
 	} dwla_cpupercent;
+#if HAVE_MACH
 	os_workgroup_t workgroup;
+#endif
 	dispatch_pthread_root_queue_observer_hooks_s dwla_observers;
 } dispatch_workloop_attr_s;