CPP-6325 Do not sleep in readAvailableBlocking() for pty, things won't become better anyway

platform/util/src/com/intellij/util/io/BaseInputStreamReader.java

@@ -15,6 +15,7 @@
  */
 package com.intellij.util.io;
 
+import com.pty4j.unix.PTYInputStream;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
@@ -42,4 +43,8 @@ public class BaseInputStreamReader extends InputStreamReader {
   public void close() throws IOException {
     myInputStream.close(); // close underlying input stream without locking in StreamDecoder.
   }
+
+  public boolean availableUnsupported() {
+    return myInputStream instanceof PTYInputStream;
+  }
 }

platform/util/src/com/intellij/util/io/BaseOutputReader.java

@@ -93,6 +93,7 @@ public abstract class BaseOutputReader extends BaseDataReader {
    * @throws IOException If an I/O error occurs
    */
   protected final boolean readAvailableBlocking() throws IOException {
+    final boolean availableUnsupported = ((BaseInputStreamReader)myReader).availableUnsupported();
     boolean read = false;
 
     int n;
@@ -101,14 +102,19 @@ public abstract class BaseOutputReader extends BaseDataReader {
         read = true;
         processLine(myInputBuffer, myLineBuffer, n);
       }
-      if (!myReader.ready()) {
+
+      boolean isReady = availableUnsupported || myReader.ready();
+
+      if (!isReady) {
         TimeoutUtil.sleep(mySleepingPolicy.getTimeToSleep(n > 0));
-        if (!myReader.ready()) {
-          if (myLineBuffer.length() > 0) {
-            sendLine(myLineBuffer);
-          }
-          onBufferExhaustion();
+        isReady = myReader.ready();
+      }
+
+      if (!isReady) {
+        if (myLineBuffer.length() > 0) {
+          sendLine(myLineBuffer);
         }
+        onBufferExhaustion();
       }
     }
 

platform/util/util.iml

@@ -23,6 +23,7 @@
     <orderEntry type="library" name="batik" level="project" />
     <orderEntry type="library" name="xmlgraphics-commons" level="project" />
     <orderEntry type="library" name="xml-apis-ext" level="project" />
+    <orderEntry type="library" name="pty4j" level="project" />
   </component>
   <component name="copyright">
     <Base>