April 2011 - libdispatch-dev - lists.macosforge.org

libdispatch for Win32
by DrPizza 30 Apr '11

30 Apr '11

So, I've got the basics working tolerably well. Is this something that people care about/want source for? What I've done so far is as follows: Get most of the code building properly in VC++ 2010: * Replace C99 named initializers with old-fashioned aggregate initializers. * Replace gcc typeof with real type names. * Replace gcc's fancy macros with less fancy standard C89 ones. * VC++ has no equivalent (AFAIK) to gcc's transparent_union, so insert casts as necessary. * Minor bits and pieces like get rid of the ?: gccism. * Provide minimal Win32 equivalents to missing UNIX headers that seem necessary. Blocks: * Only Microsoft is in a position to produce built-in block support for VC++ and I'm sure as hell not going to write a source-source translator. Instead, I have a C++ lambda wrapper that works in conjunction with the _f function variants. This seems more than enough for most purposes. Port pthread_workqueues to Win32: * Built on top of "new-style" (Vista and up) Win32 threadpools. * Reasonably complete. * Reasonably inadequately tested. Rework dispatch_sources: * The Windows overlapped I/O model is better than the traditional UNIX one, but doesn’t readily support: DISPATCH_SOURCE_TYPE_READ DISPATCH_SOURCE_TYPE_WRITE * And Windows in general doesn't have any good analogues to: DISPATCH_SOURCE_TYPE_VNODE DISPATCH_SOURCE_TYPE_SIGNAL DISPATCH_SOURCE_TYPE_PROC DISPATCH_SOURCE_TYPE_MACH_RECV DISPATCH_SOURCE_TYPE_MACH_SEND * But what I do have instead is initial support DISPATCH_SOURCE_TYPE_OIO (for "overlapped I/O") example: https://gist.github.com/938097 * Overlapped I/O supports files, sockets, named pipes, and more. All of these need testing. * The loss of READ/WRITE/SIGNAL/MACH_* is no big deal on Windows, as they don't really fit into Win32 anyway. Only one PROC feature (EXIT) translates into Win32, and I'm not seeing any clearly compelling reason to replicate it, as it doesn't seem especially useful. However, the loss of VNODE is unfortunate, as it both have interesting features. But this may not be fatal. ReadDirectoryChangeNotificationsW supports overlapped I/O, so should plumb into my existing DISPATCH_SOURCE_TYPE_OIO with no changes anyway, though the interface will not be quite as tidy. * I still need to test: DISPATCH_SOURCE_TYPE_DATA_ADD DISPATCH_SOURCE_TYPE_DATA_OR * I need to fix: DISPATCH_SOURCE_TYPE_TIMER I ripped out part of the machinery to make the code clearer temporarily; now I need to add it back. * I also need to examine the ins and outs of cancellation and suspension and so on and so forth. Win32 doesn't allow a handle to be detached from an IOCP except by closing the handle, so there are some sadnesses there. I'm not sure how much impact they'll have in practice, possibly none. * I am toying with the idea of something along the lines of DISPATCH_SOURCE_TYPE_WAITABLE, which would perform a wait on any Win32 waitable object (so mutex, event, waitable timer handles, amongst others) and dispatch a message to a queue when that wait occurs. This would give us back the one PROC scenario that makes sense in Win32, too, as you can wait on a process handle, and the wait resumes when the process terminates. Due to the annoying traits of WaitForMultipleObjects (it's limited to 64 HANDLEs), however, this might be a little awkward to implement without moving to a rather wasteful thread-per-wait model. * There are almost certainly memory leaks, bugs, etc.. My focus has been on validating the general approach more than writing a bunch of test cases. Main queues: * From my understanding of Mac OS X, Windows has no real meaningful equivalent of Cocoa's blessed main queue. Any thread can have a message pump and associated windows, which it's then responsible for drawing, etc.. Processes have an M:N model (M threads, controlling N windows), with each window being affinitized to its own thread. * However, the ability to post a message back into a window's message loop is obviously invaluable, so I want to create as close a workalike as makes sense in Win32. Something that captures the spirit, if not the exact same API. I've not yet written any code for this, but my plan of action is to do something along these lines: 1) allow creation of serial queues bound to an HWND or HWNDs. Callbacks posted to these queues will be pumped into the WndProc one-by-one. 2) Either a WndProc hook or a helper function (or both) to respond to the callbacks posted to the WndProc and execute them. 3) Possibly some convenience helpers to allow the retrieval of a queue given an HWND and so on. Distant future: * There would be certain benefits to ripping out the pthread_workqueues and using the new-style Win32 threadpools directly. The Win32 threadpools directly support timers, so they might allow DISPATCH_SOURCE_TYPE_TIMER to be moved off the dispatch_mgr queue/thread. Likewise, they directly support overlapped I/O, so might allow DISPATCH_SOURCE_TYPE_OIO to be moved off the dispatch_mgr thread too. They also directly support waits on handles, which would greatly simplify DISPATCH_SOURCE_TYPE_WAITABLE (if I do indeed go down that route). So the advantages would be many--but I am wary of diverging too far from the existing source, which is why thus far I've implemented pthread_workqueues instead; it was the easy solution. * Going in the opposite direction, some might prefer switching to Windows 2000-style thread pools, so as to support Windows XP instead. This would work (and I think someone on the list mentioned that they had implemented pthread_workqueue on that API already), but it also means eliminating the possibility of the streamlined implementations described above. Source code: My plan was to dump it into my github, if people find the whole thing interesting, though I was going to wait until I'd fixed timer sources, since they're rather important. Peter

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trivial linux patch + general questions
by "C. Bergström" 22 Apr '11

22 Apr '11

Can someone apply this if it's a proper fix ------------- diff --git a/autogen.sh b/autogen.sh old mode 100644 new mode 100755 diff --git a/testing/Makefile.am b/testing/Makefile.am index 404ced0..103d8bf 100644 --- a/testing/Makefile.am +++ b/testing/Makefile.am @@ -81,7 +81,7 @@ TOOLS= \ noinst_PROGRAMS+=$(TOOLS) INCLUDES=-I$(top_builddir) -I$(top_srcdir) -LDADD=libtest.la ../src/libdispatch.la +LDADD=libtest.la ../src/libdispatch.la ../src/libshims.la CFLAGS=-Wall $(MARCH_FLAGS) $(CBLOCKS_FLAGS) CXXFLAGS=-Wall $(MARCH_FLAGS) $(CXXBLOCKS_FLAGS) --------- I also get a test failure with make check --------- LOW: 68 ******************************************* DEFAULT: 63 **************************************** HIGH: 61 *************************************** Actual: 192 Expected: 192 [PASS] blocks completed Actual: 68 Expected: <61 [FAIL] high priority precedence (../../testing/dispatch_priority.c:83) ../../testing/dispatch_priority.c:83 PASS: dispatch_priority ================================================== [TEST] Dispatch Priority (Set Target Queue) [PID] 541 ================================================== --------- Is this an out of sync test case or a legitimate failure? Last two questions.. Does anyone have ideas on Solaris or Linux non-portable tsd or semaphore optimizations? Thanks! ./C

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Regarding dispatch_get_main_queue() and the thread it is actual executing on
by Marius Zwicker 19 Apr '11

19 Apr '11

Hi everyone, During my work for libDispatch I had to find a way for implementing TSD de-allocators (which are not available on windows). While doing so I did some extensive debugging on OS X / Linux for understanding what is actually happening when calling dispatch_main(). Weird enough it seemed to me as if the main thread would never execute an item from the main queue but simply go to sleep instead. To verify this behaviour, I wrote a test to compare the pthread_t handles during execution: static pthread_t main_thread; void pass(void* dt){ pthread_t now = pthread_self(); assert(pthread_equal(now, main_thread) == 1); exit(0); } void dispatch_api() { dispatch_queue_t q = NULL; main_thread = pthread_self(); q = dispatch_get_main_queue(); assert(q != NULL); dispatch_async_f(q, NULL, pass); ... dispatch_main(); } This test is approving my suspicions, as the pthread_equal(...) assertion is constantly failing. So the big question is: What am I missing? I thought the main queue is available as a mean to be sure some blocks execute on the main thread (e.g. when updating the GUI is only possible while being on the main thread). I welcome any hints or help. - Marius Zwicker

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libdispatch with Visual Studio
by Brent Fulgham 16 Apr '11

16 Apr '11

I spent a few minutes yesterday playing with the libdispatch sources to see how far I could get building under Visual Studio. As expected, it choked when presented with various useful gcc extensions, such as named structure initializers, differences in macro handling, and so forth. All of these differences are fairly easily resolved, with the exception of the gcc-specific 'typeof' operator. I'm not sure how to provide similar behavior under the Visual C++ compiler, as I don't think it has a mechanism to determine the static type of an expression at runtime. Can anyone comment on how this is resolved for the Apple build of libdispatch (i.e., the version that ships with Safari/WebKit)? Thanks, -Brent

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libdispatch on Windows
by Brent Fulgham 14 Apr '11

14 Apr '11

Hi Everyone, A few weeks ago, Kevin posted on the mailing list in response to Marius Zwicker's report of his Linux/Windows port: "It's great that you have enough interest in the libdispatch project to work on a port to Linux and Win32. If you weren't aware, we already have Linux and partial Win32 support in the primary libdispatch source repository. I would encourage you to contribute modifications to the primary project rather than attempt a complete rewrite." I was wondering if there is any information on how to build or test the Windows code? I'd like to contribute to moving that project forward. Thanks, -Brent

2 1

porting status
by Mark Heily 13 Apr '11

13 Apr '11

Here's some news on the effor to porting libdispatch to other platforms: * libkqueue has been submitted for inclusion in Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=684446 * libpthread_workqueue has been uploaded to the Debian archive: http://ftp-master.debian.org/new/libpthread-workqueue_0.4.1-1.html * All of the libdispatch unit tests are working on Linux using the latest SVN sources of libkqueue and libpthread_workqueue. Here's the output: ================================================== [TEST] Dispatch (Public) API [PID] 23983 ================================================== Actual: 0x602540 Expected: 0x602540 [PASS] dispatch_get_main_queue PASS: dispatch_api ================================================== [TEST] Dispatch C99 [PID] 24003 ================================================== Actual: 0x602540 Expected: 0x602540 [PASS] dispatch_get_main_queue PASS: dispatch_c99 ================================================== [TEST] Dispatch Cascade [PID] 24023 ================================================== maxcount = 2993 * * * * * * * * * * * * * * * * * ** * ** * * ** * * * ** * * ** ** ****** * * ** ****** * ** * * * * PASS: dispatch_cascade ================================================== [TEST] Dispatch Debug [PID] 24045 ================================================== PASS: dispatch_debug ================================================== [TEST] Dispatch Starfish [PID] 24066 ================================================== lap: 10 count: 1000 delta: 753127910 ns math: 376.187767 ns / lap Actual: 376 Expected: <1000 [PASS] Latency lap: 9 count: 1000 delta: 237370287 ns math: 118.566577 ns / lap Actual: 118 Expected: <1000 [PASS] Latency lap: 8 count: 1000 delta: 204984482 ns math: 102.389851 ns / lap Actual: 102 Expected: <1000 [PASS] Latency lap: 7 count: 1000 delta: 388445296 ns math: 194.028619 ns / lap Actual: 194 Expected: <1000 [PASS] Latency lap: 6 count: 1000 delta: 361531258 ns math: 180.585044 ns / lap Actual: 180 Expected: <1000 [PASS] Latency lap: 5 count: 1000 delta: 187446526 ns math: 93.629633 ns / lap Actual: 93 Expected: <1000 [PASS] Latency lap: 4 count: 1000 delta: 155628229 ns math: 77.736378 ns / lap Actual: 77 Expected: <1000 [PASS] Latency lap: 3 count: 1000 delta: 241324652 ns math: 120.541784 ns / lap Actual: 120 Expected: <1000 [PASS] Latency lap: 2 count: 1000 delta: 179030487 ns math: 89.425818 ns / lap Actual: 89 Expected: <1000 [PASS] Latency lap: 1 count: 1000 delta: 147013706 ns math: 73.433420 ns / lap Actual: 73 Expected: <1000 [PASS] Latency PASS: dispatch_starfish ================================================== [TEST] Dispatch Priority [PID] 24140 ================================================== LOW: 77 ************************************************* DEFAULT: 0 HIGH: 115 ************************************************************************ Actual: 192 Expected: 192 [PASS] blocks completed Actual: 77 Expected: <115 [PASS] high priority precedence PASS: dispatch_priority ================================================== [TEST] Dispatch Priority (Set Target Queue) [PID] 24175 ================================================== Actual: 0x2242420 Expected: 0x2242420 [PASS] q[i] Actual: 0x22426f0 Expected: 0x22426f0 [PASS] q[i] Actual: 0x22427f0 Expected: 0x22427f0 [PASS] q[i] LOW: 45 ***************************** DEFAULT: 72 ********************************************* HIGH: 75 *********************************************** Actual: 192 Expected: 192 [PASS] blocks completed Actual: 45 Expected: <75 [PASS] high priority precedence PASS: dispatch_priority2 ================================================== [TEST] Dispatch Source Read [PID] 24205 ================================================== Actual: 0x602e90 Expected: 0x602e90 [PASS] dispatch_get_main_queue Actual: 0x134f420 Expected: 0x134f420 [PASS] DISPATCH_SOURCE_TYPE_READ bytes available: 931708 bytes read: 512000 bytes available: 419708 bytes read: 419708 Actual: 0 Expected: 0 [PASS] EOF Actual: 931708 Expected: 931708 [PASS] Bytes read Actual: 0 Expected: 0 [PASS] close PASS: dispatch_read ================================================== [TEST] Dispatch Queue Finalizer [PID] 24227 ================================================== Actual: 0xa8d420 Expected: 0xa8d420 [PASS] dispatch_queue_new Actual: 0x311694489c071ab7 Expected: 0x311694489c071ab7 [PASS] finalizer ran PASS: queue_finalizer ================================================== [TEST] Dispatch After [PID] 24247 ================================================== Actual: 0 Expected: <503549891 [PASS] can't finish faster than 5.5s Actual: 0 Expected: <496451540 [PASS] must finish faster than 6.5s Actual: 0 Expected: <500150111 [PASS] can't finish faster than 1.5s Actual: 0 Expected: <499850531 [PASS] must finish faster than 2.5s Actual: 0 Expected: <21119 [PASS] can't finish faster than 0s Actual: 0 Expected: <499979465 [PASS] must finish faster than .5s PASS: dispatch_after ================================================== [TEST] Dispatch Apply [PID] 24269 ================================================== Actual: 0x2af379697750 Expected: 0x2af379697750 [PASS] dispatch_get_concurrent_queue Actual: 32 Expected: 32 [PASS] count PASS: dispatch_apply ================================================== [TEST] Timer drift test [PID] 24289 ================================================== Actual: 0x7c7420 Expected: 0x7c7420 [PASS] DISPATCH_SOURCE_TYPE_TIMER 1: jitter 0.000000, drift 0.000000 2: jitter -0.000054, drift -0.000054 3: jitter 0.000025, drift 0.000079 4: jitter 0.000026, drift 0.000001 5: jitter 0.000023, drift -0.000003 6: jitter 0.000021, drift -0.000002 7: jitter 0.000023, drift 0.000002 8: jitter 0.000024, drift 0.000001 9: jitter 0.000025, drift 0.000001 10: jitter 0.000025, drift 0.000000 11: jitter 0.000026, drift 0.000001 12: jitter 0.000024, drift -0.000002 13: jitter 0.000023, drift -0.000001 14: jitter 0.000025, drift 0.000002 15: jitter 0.000024, drift -0.000001 16: jitter 0.000024, drift 0.000000 17: jitter 0.000024, drift -0.000000 18: jitter 0.000039, drift 0.000015 19: jitter 0.000034, drift -0.000005 20: jitter 0.000032, drift -0.000002 21: jitter 0.000035, drift 0.000003 22: jitter 0.000028, drift -0.000007 23: jitter 0.000034, drift 0.000006 24: jitter 0.000037, drift 0.000003 25: jitter 0.000033, drift -0.000004 26: jitter 0.000033, drift -0.000000 27: jitter 0.000031, drift -0.000002 28: jitter 0.000035, drift 0.000004 29: jitter 0.000036, drift 0.000001 30: jitter 0.000034, drift -0.000002 31: jitter 0.000036, drift 0.000002 32: jitter -0.000006, drift -0.000042 33: jitter 0.000033, drift 0.000039 34: jitter 0.000036, drift 0.000003 35: jitter 0.000033, drift -0.000003 36: jitter 0.000034, drift 0.000001 37: jitter -0.000200, drift -0.000234 38: jitter 0.000035, drift 0.000235 39: jitter 0.000035, drift 0.000000 40: jitter 0.000036, drift 0.000001 41: jitter 0.000034, drift -0.000002 42: jitter 0.000039, drift 0.000005 43: jitter 0.000038, drift -0.000001 44: jitter 0.000035, drift -0.000003 45: jitter 0.000092, drift 0.000057 46: jitter 0.000031, drift -0.000061 47: jitter -0.000002, drift -0.000033 48: jitter 0.000033, drift 0.000035 49: jitter 0.000036, drift 0.000003 50: jitter 0.000036, drift 0.000000 51: jitter -0.001187, drift -0.001223 52: jitter 0.000042, drift 0.001229 53: jitter 0.000027, drift -0.000015 54: jitter 0.000023, drift -0.000004 55: jitter 0.000031, drift 0.000008 56: jitter 0.000018, drift -0.000013 57: jitter -0.001240, drift -0.001258 58: jitter 0.000032, drift 0.001272 59: jitter 0.000034, drift 0.000002 60: jitter 0.000036, drift 0.000002 61: jitter 0.000034, drift -0.000002 62: jitter 0.000034, drift -0.000000 63: jitter 0.000049, drift 0.000015 64: jitter 0.000035, drift -0.000014 65: jitter -0.001232, drift -0.001267 66: jitter 0.000030, drift 0.001262 67: jitter 0.000035, drift 0.000005 68: jitter 0.000033, drift -0.000002 69: jitter 0.000035, drift 0.000002 70: jitter 0.000034, drift -0.000001 71: jitter 0.000035, drift 0.000001 72: jitter 0.000033, drift -0.000002 73: jitter 0.000029, drift -0.000004 74: jitter 0.000036, drift 0.000007 75: jitter 0.000033, drift -0.000003 76: jitter 0.000039, drift 0.000006 77: jitter 0.000026, drift -0.000013 78: jitter 0.000026, drift 0.000000 79: jitter 0.000027, drift 0.000001 80: jitter 0.000026, drift -0.000001 81: jitter 0.000027, drift 0.000001 82: jitter 0.000026, drift -0.000001 83: jitter 0.000025, drift -0.000001 84: jitter 0.000026, drift 0.000001 85: jitter 0.000029, drift 0.000003 86: jitter 0.000021, drift -0.000008 87: jitter 0.000024, drift 0.000003 88: jitter 0.000026, drift 0.000002 89: jitter 0.000027, drift 0.000001 90: jitter 0.000026, drift -0.000001 91: jitter 0.000027, drift 0.000001 92: jitter 0.000027, drift 0.000000 93: jitter 0.000026, drift -0.000001 94: jitter 0.000026, drift 0.000000 95: jitter 0.000025, drift -0.000001 96: jitter 0.000025, drift 0.000000 97: jitter 0.000025, drift -0.000000 98: jitter 0.000025, drift 0.000000 99: jitter 0.000028, drift 0.000003 100: jitter 0.000026, drift -0.000002 101: jitter 0.000027, drift 0.000001 102: jitter 0.000027, drift 0.000000 103: jitter 0.000023, drift -0.000004 104: jitter 0.000026, drift 0.000003 105: jitter 0.000025, drift -0.000001 106: jitter 0.000024, drift -0.000001 107: jitter 0.000025, drift 0.000001 108: jitter 0.000025, drift 0.000000 109: jitter 0.000026, drift 0.000001 110: jitter 0.000025, drift -0.000001 111: jitter 0.000026, drift 0.000001 112: jitter 0.000024, drift -0.000002 113: jitter 0.000025, drift 0.000001 114: jitter 0.000024, drift -0.000001 115: jitter 0.000025, drift 0.000001 116: jitter 0.000024, drift -0.000001 117: jitter 0.000024, drift -0.000000 118: jitter 0.000025, drift 0.000001 119: jitter 0.000037, drift 0.000012 120: jitter 0.000025, drift -0.000012 121: jitter 0.000026, drift 0.000001 122: jitter 0.000026, drift 0.000000 123: jitter 0.000025, drift -0.000001 124: jitter 0.000026, drift 0.000001 125: jitter 0.000026, drift 0.000000 126: jitter 0.000023, drift -0.000003 127: jitter 0.000023, drift 0.000000 128: jitter 0.000025, drift 0.000002 129: jitter 0.000027, drift 0.000002 130: jitter 0.000027, drift 0.000000 131: jitter 0.000026, drift -0.000001 132: jitter 0.000026, drift 0.000000 133: jitter 0.000024, drift -0.000002 134: jitter 0.000045, drift 0.000021 135: jitter 0.000025, drift -0.000020 136: jitter 0.000024, drift -0.000001 137: jitter 0.000024, drift -0.000000 138: jitter 0.000024, drift 0.000000 139: jitter 0.000026, drift 0.000002 140: jitter 0.000025, drift -0.000001 141: jitter 0.000027, drift 0.000002 142: jitter 0.000029, drift 0.000002 143: jitter 0.000027, drift -0.000002 144: jitter 0.000026, drift -0.000001 145: jitter 0.000026, drift 0.000000 146: jitter 0.000021, drift -0.000005 147: jitter 0.000024, drift 0.000003 148: jitter 0.000023, drift -0.000001 149: jitter 0.000025, drift 0.000002 150: jitter 0.000025, drift 0.000000 151: jitter 0.000025, drift 0.000000 152: jitter 0.000025, drift -0.000000 153: jitter 0.000025, drift 0.000000 154: jitter 0.000025, drift 0.000000 155: jitter 0.000026, drift 0.000001 156: jitter 0.000024, drift -0.000002 157: jitter 0.000023, drift -0.000001 158: jitter 0.000024, drift 0.000001 159: jitter 0.000024, drift -0.000000 160: jitter 0.000025, drift 0.000001 161: jitter 0.000026, drift 0.000001 162: jitter 0.000026, drift 0.000000 163: jitter 0.000023, drift -0.000003 164: jitter 0.000027, drift 0.000004 165: jitter 0.000026, drift -0.000001 166: jitter 0.000023, drift -0.000003 167: jitter 0.000025, drift 0.000002 168: jitter 0.000026, drift 0.000001 169: jitter 0.000027, drift 0.000001 170: jitter 0.000026, drift -0.000001 171: jitter 0.000026, drift 0.000000 172: jitter 0.000026, drift 0.000000 173: jitter 0.000039, drift 0.000013 174: jitter 0.000027, drift -0.000012 175: jitter 0.000026, drift -0.000001 176: jitter 0.000024, drift -0.000002 177: jitter 0.000026, drift 0.000002 178: jitter 0.000026, drift 0.000000 179: jitter 0.000027, drift 0.000001 180: jitter 0.000026, drift -0.000001 181: jitter 0.000026, drift 0.000000 182: jitter 0.000030, drift 0.000004 183: jitter 0.000026, drift -0.000004 184: jitter 0.000026, drift 0.000000 185: jitter 0.000027, drift 0.000001 186: jitter 0.000021, drift -0.000006 187: jitter 0.000022, drift 0.000001 188: jitter 0.000025, drift 0.000003 189: jitter 0.000025, drift 0.000000 190: jitter 0.000027, drift 0.000002 191: jitter 0.000027, drift -0.000000 192: jitter 0.000026, drift -0.000001 193: jitter 0.000025, drift -0.000001 194: jitter 0.000025, drift 0.000000 195: jitter 0.000027, drift 0.000002 196: jitter 0.000024, drift -0.000003 197: jitter 0.000024, drift -0.000000 198: jitter 0.000025, drift 0.000001 199: jitter 0.000025, drift 0.000000 200: jitter 0.000025, drift 0.000000 201: jitter 0.000027, drift 0.000002 202: jitter 0.000026, drift -0.000001 203: jitter 0.000025, drift -0.000001 204: jitter 0.000026, drift 0.000001 205: jitter 0.000026, drift 0.000000 206: jitter 0.000022, drift -0.000004 207: jitter 0.000023, drift 0.000001 208: jitter 0.000025, drift 0.000002 209: jitter 0.000027, drift 0.000002 210: jitter 0.000026, drift -0.000001 211: jitter 0.000027, drift 0.000001 212: jitter 0.000027, drift 0.000000 213: jitter 0.000029, drift 0.000002 214: jitter 0.000053, drift 0.000024 215: jitter 0.000025, drift -0.000028 216: jitter 0.000025, drift 0.000000 217: jitter 0.000024, drift -0.000001 218: jitter 0.000025, drift 0.000001 219: jitter 0.000026, drift 0.000001 220: jitter 0.000026, drift 0.000000 221: jitter 0.000050, drift 0.000024 222: jitter 0.000025, drift -0.000025 223: jitter 0.000024, drift -0.000001 224: jitter 0.000026, drift 0.000002 225: jitter 0.000025, drift -0.000001 226: jitter 0.000022, drift -0.000003 227: jitter 0.000024, drift 0.000002 228: jitter 0.000025, drift 0.000001 229: jitter 0.000026, drift 0.000001 230: jitter 0.000051, drift 0.000025 231: jitter 0.000027, drift -0.000024 232: jitter 0.000025, drift -0.000002 233: jitter 0.000026, drift 0.000001 234: jitter 0.000025, drift -0.000001 235: jitter 0.000026, drift 0.000001 236: jitter 0.000051, drift 0.000025 237: jitter 0.000019, drift -0.000032 238: jitter 0.000127, drift 0.000108 239: jitter 0.000026, drift -0.000101 240: jitter 0.000026, drift 0.000000 241: jitter 0.000026, drift 0.000000 242: jitter 0.000026, drift 0.000000 243: jitter 0.000026, drift 0.000000 244: jitter 0.000027, drift 0.000001 245: jitter 0.000027, drift 0.000000 246: jitter 0.000023, drift -0.000004 247: jitter 0.000024, drift 0.000001 248: jitter 0.000025, drift 0.000001 249: jitter 0.000026, drift 0.000001 250: jitter 0.000026, drift 0.000000 Actual: 0.000012 Expected: <0.000100 [PASS] average jitter Actual: 0.000000 Expected: <0.000100 [PASS] average drift PASS: dispatch_drift ================================================== [TEST] Dispatch Group [PID] 24311 ================================================== Actual: 0x103a420 Expected: 0x103a420 [PASS] dispatch_group_async Actual: 0x2b1490002260 Expected: 0x2b1490002260 [PASS] dispatch_group_async sleeping... sleeping... sleeping... Actual: 0 Expected: 0 [PASS] dispatch_group_wait done. done. done. Actual: 0 Expected: 0 [PASS] dispatch_group_wait Actual: 0x2b1490001420 Expected: 0x2b1490001420 [PASS] dispatch_group_async Actual: 0x602eb0 Expected: 0x602eb0 [PASS] Notification Received PASS: dispatch_group ================================================== [TEST] Dispatch Ping Pong [PID] 24334 ================================================== Actual: 0xf7d420 Expected: 0xf7d420 [PASS] dispatch_queue_create(ping) Actual: 0xf7d4d0 Expected: 0xf7d4d0 [PASS] dispatch_queue_create(pong) Actual: 0xf7d580 Expected: 0xf7d580 [PASS] dispatch_group_create Actual: 1000000 Expected: 1000000 [PASS] count PASS: dispatch_pingpong ================================================== [TEST] Dispatch Reader/Writer Queues [PID] 24355 ================================================== PASS: dispatch_readsync ================================================== [TEST] Dispatch Semaphore [PID] 24380 ================================================== Actual: 10000 Expected: 10000 [PASS] count PASS: dispatch_sema ================================================== [TEST] Dispatch Source Timer, bit 31 [PID] 24401 ================================================== Actual: 0x602a50 Expected: 0x602a50 [PASS] dispatch_get_main_queue Actual: 0x17c3420 Expected: 0x17c3420 [PASS] DISPATCH_SOURCE_TYPE_TIMER Actual: 2 Expected: <4 [PASS] elapsed time < 4s Actual: 1 Expected: <2 [PASS] elapsed time > 2s PASS: dispatch_timer_bit31 ================================================== [TEST] Dispatch Source Timer, bit 63 [PID] 24423 ================================================== 0 PASS: dispatch_timer_bit63 =================== All 18 tests passed ===================

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