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// +build js
package sync
import "github.com/gopherjs/gopherjs/js"
var semWaiters = make(map[*uint32][]chan bool)
// semAwoken tracks the number of waiters awoken by runtime_Semrelease (`ch <- true`)
// that have not yet acquired the semaphore (`<-ch` in runtime_SemacquireMutex).
//
// This prevents a new call to runtime_SemacquireMutex to wrongly acquire the semaphore
// in between (because runtime_Semrelease has already incremented the semaphore while
// all the pending calls to runtime_SemacquireMutex have not yet received from the channel
// and thus decremented the semaphore).
//
// See https://github.com/gopherjs/gopherjs/issues/736.
var semAwoken = make(map[*uint32]uint32)
func runtime_Semacquire(s *uint32) {
runtime_SemacquireMutex(s, false)
}
// SemacquireMutex is like Semacquire, but for profiling contended Mutexes.
// Mutex profiling is not supported, so just use the same implementation as runtime_Semacquire.
// TODO: Investigate this. If it's possible to implement, consider doing so, otherwise remove this comment.
func runtime_SemacquireMutex(s *uint32, lifo bool) {
if (*s - semAwoken[s]) == 0 {
ch := make(chan bool)
if lifo {
semWaiters[s] = append([]chan bool{ch}, semWaiters[s]...)
} else {
semWaiters[s] = append(semWaiters[s], ch)
}
<-ch
semAwoken[s] -= 1
if semAwoken[s] == 0 {
delete(semAwoken, s)
}
}
*s--
}
func runtime_Semrelease(s *uint32, handoff bool) {
// TODO: Use handoff if needed/possible.
*s++
w := semWaiters[s]
if len(w) == 0 {
return
}
ch := w[0]
w = w[1:]
semWaiters[s] = w
if len(w) == 0 {
delete(semWaiters, s)
}
semAwoken[s] += 1
ch <- true
}
func runtime_notifyListCheck(size uintptr) {}
func runtime_canSpin(i int) bool {
return false
}
// Copy of time.runtimeNano.
func runtime_nanotime() int64 {
const millisecond = 1000000
return js.Global.Get("Date").New().Call("getTime").Int64() * millisecond
}
// Implemented in runtime.
func throw(s string) {
js.Global.Call("$throwRuntimeError", s)
}
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