// Schedules the Stream on a new thread
// and starts delivering events on the channel.
//
// https://developer.apple.com/library/mac/documentation/Darwin/Reference/FSEvents_Ref/Reference/reference.html#jumpTo_20
// https://developer.apple.com/library/mac/documentation/Darwin/Reference/FSEvents_Ref/Reference/reference.html#jumpTo_17
func (s *Stream) Start() bool {
type watchSuccessData struct {
runloop C.CFRunLoopRef
stream Stream
}
successChan := make(chan C.CFRunLoopRef)
go func() {
C.FSEventStreamScheduleWithRunLoop(s.cstream,
C.CFRunLoopGetCurrent(), C.kCFRunLoopCommonModes)
ok := C.FSEventStreamStart(s.cstream) != C.FALSE
if ok {
successChan <- C.CFRunLoopGetCurrent()
C.CFRunLoopRun()
} else {
successChan <- nil
}
}()
runloop := <-successChan
if runloop == nil {
return false
}
s.runloop = runloop
return true
}
func startScanner(dir string) {
lock.Lock()
chans[dir] = make(chan string)
lock.Unlock()
cpaths := C.fswatch_make_mutable_array()
defer C.free(unsafe.Pointer(cpaths))
path := C.CString(dir)
str := C.CFStringCreateWithCString(nil, path, C.kCFStringEncodingUTF8)
defer C.free(unsafe.Pointer(path))
defer C.free(unsafe.Pointer(str))
C.CFArrayAppendValue(cpaths, unsafe.Pointer(str))
ctx := C.FSEventStreamContext{info: unsafe.Pointer(C.CString(dir))}
stream := C.fswatch_create(&ctx, cpaths, now, C.CFTimeInterval(interval/time.Second), cflags)
go func() {
C.FSEventStreamScheduleWithRunLoop(stream, C.CFRunLoopGetCurrent(), C.kCFRunLoopCommonModes)
C.FSEventStreamStart(stream)
C.CFRunLoopRun()
}()
}
func (w *Watcher) watchPath(path string, options *Options) error {
path, _ = filepath.Abs(path)
w.wmut.Lock()
_, found := w.watches[path]
w.wmut.Unlock()
if !found {
cPaths := C.ArrayCreateMutable(C.int(1))
defer C.CFRelease(C.CFTypeRef(cPaths))
cpath := C.CString(path)
defer C.free(unsafe.Pointer(cpath))
str := C.CFStringCreateWithCString(nil, cpath, C.kCFStringEncodingUTF8)
C.CFArrayAppendValue(cPaths, unsafe.Pointer(str))
context := C.FSEventStreamContext{info: unsafe.Pointer(&w.internalEvent)}
latency := C.CFTimeInterval(0)
if options != nil && options.Throttle {
latency = C.CFTimeInterval(options.ThrottleDuration / time.Second)
}
stream := C.EventStreamCreate(&context, cPaths, C.kFSEventStreamEventIdSinceNow+(1<<64), latency)
w.wmut.Lock()
w.watches[path] = stream
w.wmut.Unlock()
C.FSEventStreamScheduleWithRunLoop(stream, w.rlref, C.kCFRunLoopDefaultMode)
C.FSEventStreamStart(stream)
}
return nil
}
// Start listening to an event stream.
func (es *EventStream) Start() {
cPaths := C.ArrayCreateMutable(C.int(len(es.Paths)))
defer C.CFRelease(C.CFTypeRef(cPaths))
for _, p := range es.Paths {
p, _ = filepath.Abs(p)
cpath := C.CString(p)
defer C.free(unsafe.Pointer(cpath))
str := C.CFStringCreateWithCString(nil, cpath, C.kCFStringEncodingUTF8)
C.CFArrayAppendValue(cPaths, unsafe.Pointer(str))
}
since := C.FSEventStreamEventId(EventIDSinceNow)
if es.Resume {
since = C.FSEventStreamEventId(es.EventID)
}
if es.Events == nil {
es.Events = make(chan []Event)
}
es.registryID = registry.Add(es)
context := C.FSEventStreamContext{}
info := C.uintptr_t(es.registryID)
latency := C.CFTimeInterval(float64(es.Latency) / float64(time.Second))
if es.Device != 0 {
es.stream = C.EventStreamCreateRelativeToDevice(&context, info, C.dev_t(es.Device), cPaths, since, latency, C.FSEventStreamCreateFlags(es.Flags))
} else {
es.stream = C.EventStreamCreate(&context, info, cPaths, since, latency, C.FSEventStreamCreateFlags(es.Flags))
}
started := make(chan struct{})
go func() {
runtime.LockOSThread()
es.rlref = C.CFRunLoopGetCurrent()
C.FSEventStreamScheduleWithRunLoop(es.stream, es.rlref, C.kCFRunLoopDefaultMode)
C.FSEventStreamStart(es.stream)
close(started)
C.CFRunLoopRun()
}()
if !es.hasFinalizer {
runtime.SetFinalizer(es, finalizer)
es.hasFinalizer = true
}
<-started
}
// Start creates a FSEventStream for the given path and schedules it with
// global runloop. It's a nop if the stream was already started.
func (s *stream) Start() error {
if s.ref != nilstream {
return nil
}
wg.Wait()
p := C.CFStringCreateWithCStringNoCopy(nil, C.CString(s.path), C.kCFStringEncodingUTF8, nil)
path := C.CFArrayCreate(nil, (*unsafe.Pointer)(unsafe.Pointer(&p)), 1, nil)
ref := C.FSEventStreamCreate(nil, (C.FSEventStreamCallback)(C.gostream),
&s.ctx, path, C.FSEventStreamEventId(atomic.LoadUint64(&since)), latency, flags)
if ref == nilstream {
return errCreate
}
C.FSEventStreamScheduleWithRunLoop(ref, runloop, C.kCFRunLoopDefaultMode)
if C.FSEventStreamStart(ref) == C.Boolean(0) {
C.FSEventStreamInvalidate(ref)
return errStart
}
C.CFRunLoopWakeUp(runloop)
s.ref = ref
return nil
}