如何在Swift中设置实时线程? [英] How to set realtime thread in Swift?
本文介绍了如何在Swift中设置实时线程?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试从此我被困在thread_policy_set()
上.以下原因导致此编译器错误:
I'm stuck on thread_policy_set()
. The following causes this compiler error:
无法专用于非泛型定义"
"Cannot specialize a non-generic definition"
我也尝试了其他一些方法,但是使用&policy
会遇到各种类型的不匹配错误.任何建议将不胜感激!谢谢!
I've also tried a couple other things but get various type mismatch errors with &policy
. Any suggestions would be greatly appreciated! Thanks!
func set_realtime(period: UInt32, computation: UInt32, constraint: UInt32) -> Bool {
let TIME_CONSTRAINT_POLICY: UInt32 = 2
let TIME_CONSTRAINT_POLICY_COUNT = UInt32(MemoryLayout<thread_time_constraint_policy_data_t>.size / MemoryLayout<integer_t>.size)
let SUCCESS: Int32 = 0
var policy: thread_time_constraint_policy
var ret: Int32
let thread: thread_port_t = pthread_mach_thread_np(pthread_self())
policy.period = period
policy.computation = computation
policy.constraint = constraint
policy.preemptible = 1
ret = withUnsafeMutablePointer<integer_t>(to: &policy, { ptr -> Int32 in
thread_policy_set(thread, TIME_CONSTRAINT_POLICY, ptr, TIME_CONSTRAINT_POLICY_COUNT)
})
if ret != SUCCESS {
print(stderr, "set_realtime() failed.\n")
return false
}
return true
}
推荐答案
您不能将类型占位符添加到withUnsafeMutablePointer()
到
将指针转换为其他类型.您必须重新绑定"指针
相反:
You cannot add a type placeholder to withUnsafeMutablePointer()
to
cast the pointer to a different type. You have to "rebind" the pointer
instead:
ret = withUnsafeMutablePointer(to: &policy) {
$0.withMemoryRebound(to: integer_t.self, capacity: Int(TIME_CONSTRAINT_POLICY_COUNT)) {
thread_policy_set(thread, TIME_CONSTRAINT_POLICY, $0, TIME_CONSTRAINT_POLICY_COUNT)
}
}
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