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/* NSC -- new Scala compiler
* Copyright 2005-2010 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools.nsc
import java.io.{ OutputStream, PrintStream, ByteArrayOutputStream, PrintWriter, StringWriter }
package object util {
/** Apply a function and return the passed value */
def returning[T](x: T)(f: T => Unit): T = { f(x) ; x }
/** All living threads. */
def allThreads(): List[Thread] = {
val num = Thread.activeCount()
val tarray = new Array[Thread](num)
val got = Thread.enumerate(tarray)
tarray take got toList
}
/** Execute code and then wait for all Threads created during its
* execution to complete.
*/
def waitingForThreads[T](body: => T) = {
val ts1 = allThreads()
val result = body
val ts2 = allThreads()
val newThreads = (ts2.toSet -- ts1) filterNot (_.isDaemon())
newThreads foreach (_.join())
result
}
/** Generate a string using a routine that wants to write on a stream. */
def stringFromWriter(writer: PrintWriter => Unit): String = {
val stringWriter = new StringWriter()
val stream = new NewLinePrintWriter(stringWriter)
writer(stream)
stream.close()
stringWriter.toString
}
def stringFromStream(stream: OutputStream => Unit): String = {
val bs = new ByteArrayOutputStream()
val ps = new PrintStream(bs)
stream(ps)
ps.close()
bs.toString()
}
}
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