--- a/src/Pure/System/isabelle_process.scala Tue Aug 12 17:28:07 2014 +0200
+++ b/src/Pure/System/isabelle_process.scala Tue Aug 12 18:36:43 2014 +0200
@@ -1,320 +1,31 @@
/* Title: Pure/System/isabelle_process.scala
Author: Makarius
- Options: :folding=explicit:collapseFolds=1:
-Isabelle process management -- always reactive due to multi-threaded I/O.
+Isabelle process wrapper.
*/
package isabelle
-import java.io.{InputStream, OutputStream, BufferedOutputStream, IOException}
-
-
class Isabelle_Process(
receiver: Prover.Message => Unit = Console.println(_),
- prover_args: List[String] = Nil)
+ prover_args: List[String] = Nil) extends Prover(receiver,
+ {
+ val system_channel = System_Channel()
+ try {
+ val cmdline =
+ Isabelle_System.getenv_strict("ISABELLE_PROCESS") ::
+ (system_channel.prover_args ::: prover_args)
+ val process =
+ new Isabelle_System.Managed_Process(null, null, false, cmdline: _*) with
+ Prover.System_Process { def channel = system_channel }
+ process.stdin.close
+ process
+ }
+ catch { case exn @ ERROR(_) => system_channel.accepted(); throw(exn) }
+ })
{
- /* system process -- default implementation */
-
- protected val system_process: Prover.System_Process =
- {
- val system_channel = System_Channel()
- try {
- val cmdline =
- Isabelle_System.getenv_strict("ISABELLE_PROCESS") ::
- (system_channel.prover_args ::: prover_args)
- val process =
- new Isabelle_System.Managed_Process(null, null, false, cmdline: _*) with
- Prover.System_Process { def channel = system_channel }
- process.stdin.close
- process
- }
- catch { case exn @ ERROR(_) => system_channel.accepted(); throw(exn) }
- }
-
-
- /* text and tree data */
-
def encode(s: String): String = Symbol.encode(s)
def decode(s: String): String = Symbol.decode(s)
-
- val xml_cache: XML.Cache = new XML.Cache()
-
-
- /* output */
-
- private def system_output(text: String)
- {
- receiver(new Prover.Output(XML.Elem(Markup(Markup.SYSTEM, Nil), List(XML.Text(text)))))
- }
-
- private def protocol_output(props: Properties.T, bytes: Bytes)
- {
- receiver(new Prover.Protocol_Output(props, bytes))
- }
-
- private def output(kind: String, props: Properties.T, body: XML.Body)
- {
- if (kind == Markup.INIT) system_process.channel.accepted()
-
- val main = XML.Elem(Markup(kind, props), Protocol.clean_message(body))
- val reports = Protocol.message_reports(props, body)
- for (msg <- main :: reports) receiver(new Prover.Output(xml_cache.elem(msg)))
- }
-
- private def exit_message(rc: Int)
- {
- output(Markup.EXIT, Markup.Return_Code(rc), List(XML.Text("Return code: " + rc.toString)))
- }
-
-
-
- /** process manager **/
-
- private val (_, process_result) =
- Simple_Thread.future("process_result") { system_process.join }
-
- private def terminate_process()
- {
- try { system_process.terminate }
- catch {
- case exn @ ERROR(_) => system_output("Failed to terminate prover process: " + exn.getMessage)
- }
- }
-
- private val process_manager = Simple_Thread.fork("process_manager")
- {
- val (startup_failed, startup_errors) =
- {
- var finished: Option[Boolean] = None
- val result = new StringBuilder(100)
- while (finished.isEmpty && (system_process.stderr.ready || !process_result.is_finished)) {
- while (finished.isEmpty && system_process.stderr.ready) {
- try {
- val c = system_process.stderr.read
- if (c == 2) finished = Some(true)
- else result += c.toChar
- }
- catch { case _: IOException => finished = Some(false) }
- }
- Thread.sleep(10)
- }
- (finished.isEmpty || !finished.get, result.toString.trim)
- }
- if (startup_errors != "") system_output(startup_errors)
-
- if (startup_failed) {
- terminate_process()
- process_result.join
- exit_message(127)
- }
- else {
- val (command_stream, message_stream) = system_process.channel.rendezvous()
-
- command_input_init(command_stream)
- val stdout = physical_output(false)
- val stderr = physical_output(true)
- val message = message_output(message_stream)
-
- val rc = process_result.join
- system_output("process terminated")
- command_input_close()
- for (thread <- List(stdout, stderr, message)) thread.join
- system_output("process_manager terminated")
- exit_message(rc)
- }
- system_process.channel.accepted()
- }
-
-
- /* management methods */
-
- def join() { process_manager.join() }
-
- def terminate()
- {
- command_input_close()
- system_output("Terminating prover process")
- terminate_process()
- }
-
-
-
- /** process streams **/
-
- /* command input */
-
- private var command_input: Option[Consumer_Thread[List[Bytes]]] = None
-
- private def command_input_close(): Unit = command_input.foreach(_.shutdown)
-
- private def command_input_init(raw_stream: OutputStream)
- {
- val name = "command_input"
- val stream = new BufferedOutputStream(raw_stream)
- command_input =
- Some(
- Consumer_Thread.fork(name)(
- consume =
- {
- case chunks =>
- try {
- Bytes(chunks.map(_.length).mkString("", ",", "\n")).write(stream)
- chunks.foreach(_.write(stream))
- stream.flush
- true
- }
- catch { case e: IOException => system_output(name + ": " + e.getMessage); false }
- },
- finish = { case () => stream.close; system_output(name + " terminated") }
- )
- )
- }
-
-
- /* physical output */
+}
- private def physical_output(err: Boolean): Thread =
- {
- val (name, reader, markup) =
- if (err) ("standard_error", system_process.stderr, Markup.STDERR)
- else ("standard_output", system_process.stdout, Markup.STDOUT)
-
- Simple_Thread.fork(name) {
- try {
- var result = new StringBuilder(100)
- var finished = false
- while (!finished) {
- //{{{
- var c = -1
- var done = false
- while (!done && (result.length == 0 || reader.ready)) {
- c = reader.read
- if (c >= 0) result.append(c.asInstanceOf[Char])
- else done = true
- }
- if (result.length > 0) {
- output(markup, Nil, List(XML.Text(decode(result.toString))))
- result.length = 0
- }
- else {
- reader.close
- finished = true
- }
- //}}}
- }
- }
- catch { case e: IOException => system_output(name + ": " + e.getMessage) }
- system_output(name + " terminated")
- }
- }
-
-
- /* message output */
-
- private def message_output(stream: InputStream): Thread =
- {
- class EOF extends Exception
- class Protocol_Error(msg: String) extends Exception(msg)
-
- val name = "message_output"
- Simple_Thread.fork(name) {
- val default_buffer = new Array[Byte](65536)
- var c = -1
-
- def read_int(): Int =
- //{{{
- {
- var n = 0
- c = stream.read
- if (c == -1) throw new EOF
- while (48 <= c && c <= 57) {
- n = 10 * n + (c - 48)
- c = stream.read
- }
- if (c != 10)
- throw new Protocol_Error("malformed header: expected integer followed by newline")
- else n
- }
- //}}}
-
- def read_chunk_bytes(): (Array[Byte], Int) =
- //{{{
- {
- val n = read_int()
- val buf =
- if (n <= default_buffer.size) default_buffer
- else new Array[Byte](n)
-
- var i = 0
- var m = 0
- do {
- m = stream.read(buf, i, n - i)
- if (m != -1) i += m
- }
- while (m != -1 && n > i)
-
- if (i != n)
- throw new Protocol_Error("bad chunk (unexpected EOF after " + i + " of " + n + " bytes)")
-
- (buf, n)
- }
- //}}}
-
- def read_chunk(): XML.Body =
- {
- val (buf, n) = read_chunk_bytes()
- YXML.parse_body_failsafe(UTF8.decode_chars(decode, buf, 0, n))
- }
-
- try {
- do {
- try {
- val header = read_chunk()
- header match {
- case List(XML.Elem(Markup(name, props), Nil)) =>
- val kind = name.intern
- if (kind == Markup.PROTOCOL) {
- val (buf, n) = read_chunk_bytes()
- protocol_output(props, Bytes(buf, 0, n))
- }
- else {
- val body = read_chunk()
- output(kind, props, body)
- }
- case _ =>
- read_chunk()
- throw new Protocol_Error("bad header: " + header.toString)
- }
- }
- catch { case _: EOF => }
- }
- while (c != -1)
- }
- catch {
- case e: IOException => system_output("Cannot read message:\n" + e.getMessage)
- case e: Protocol_Error => system_output("Malformed message:\n" + e.getMessage)
- }
- stream.close
-
- system_output(name + " terminated")
- }
- }
-
-
-
- /** protocol commands **/
-
- def protocol_command_bytes(name: String, args: Bytes*): Unit =
- command_input match {
- case Some(thread) => thread.send(Bytes(name) :: args.toList)
- case None => error("Uninitialized command input thread")
- }
-
- def protocol_command(name: String, args: String*)
- {
- receiver(new Prover.Input(name, args.toList))
- protocol_command_bytes(name, args.map(Bytes(_)): _*)
- }
-}