[280607] fixed copy-n-paste mistake in last commit. Also enhanced the documentation.

dsf-gdb/org.eclipse.cdt.dsf.gdb/src/org/eclipse/cdt/dsf/mi/service/command/output/CLIInfoThreadsInfo.java

@@ -28,13 +28,39 @@ import java.util.regex.Pattern;
  */
 public class CLIInfoThreadsInfo extends MIInfo {
 
+	/**
+	 * Matcher for 'info threads' output typically returned by gdbservers
+	 * running on POSIX systems. Relevant output is in the form: <br>
+	 * <p>
+	 * <code>
+	 * &lt;x&gt; Thread &lt;y&gt; (LWP &lt;z&gt;)
+	 * </code>
+	 * 
+	 * <p>
+	 * Where 'y' is a hex number with a '0x' prefix.
+	 * 
+	 * <p>
+	 * Note that the output likely includes non-LWP threads, but they are
+	 * intentionally ignored
+	 */
     private static final Pattern RESULT_PATTERN_LWP = Pattern.compile(
         "(^\\*?\\s*\\d+)(\\s*[Tt][Hh][Rr][Ee][Aa][Dd]\\s*)(0x[0-9a-fA-F]+|-?\\d+)(\\s*\\([Ll][Ww][Pp]\\s*)(\\d*)",  Pattern.MULTILINE); //$NON-NLS-1$
 
+	/**
+	 * Matcher for 'info threads' output typically returned by gdbservers running
+	 * on non-POSIX systems. Output is in the more general form: <br>
+	 * <p>
+	 * <code>
+	 * &lt;x&gt; Thread &lt;y&gt; (&lt;text&gt;)
+	 * </code>
+	 * 
+	 * <p>where 'y' is not necessarily numeric and (&lt;text&gt;) is optional 
+	 */
     private static final Pattern RESULT_PATTERN = Pattern.compile(
         "(^\\*?\\s*\\d+)(\\s*[Tt][Hh][Rr][Ee][Aa][Dd]\\s*)(\\S+(\\s*\\(.*?\\))?)",  Pattern.MULTILINE); //$NON-NLS-1$
+    
 	protected List<ThreadInfo> info; 
-	
+
 	public CLIInfoThreadsInfo(MIOutput out) {
 		super(out);
 		parse();
@@ -84,8 +110,9 @@ public class CLIInfoThreadsInfo extends MIInfo {
 	protected void parseThreadInfo(String str, List<ThreadInfo> info) {
 		// Fetch the OS ThreadId & Find the current thread 
 		// Here is an example output from GDB which shows normal threads as well as
-		// LWP process threads
+		// LWP process threads. We ignore non-LWP threads.
 		//
+		// [example A]
 		// (gdb) info threads
 		//   7 Thread 0x941c00 (sleeping)  0x0000000806c6d0df in pthread_mutexattr_init () from /usr/lib/libpthread.so.2
 		//   6 Thread 0x953000 (sleeping)  0x0000000806c6d0df in pthread_mutexattr_init () from /usr/lib/libpthread.so.2
@@ -94,21 +121,28 @@ public class CLIInfoThreadsInfo extends MIInfo {
 		// * 3 Thread 0x510400 (LWP 100132)  0x0000000806c7489c in pthread_testcancel () from /usr/lib/libpthread.so.2
 		//   2 Thread 0x510000 (runnable)  0x0000000806e468ec in read () from /lib/libc.so.6
 		//
-		// Here is other output which will be handled
+		// However, 'info threads' output varies, and depends on the gdbserver
 		//
+		// [example B, observed with FreeBSD] 
 		// (gdb) info threads
 		//   6 Thread 1286 (tid 38473, running)  0x00000000 in ?? ()
 		//   5 Thread 1029 (tid 34369, running)  0x00000000 in ?? ()
 		//   4 Thread 772 (tid 39483, running)  0xd037eb94 in clock_gettime ()
 		// * 3 Thread 515 (tid 39741, running)  0x00000000 in ?? ()
 		//
-		// It also turns out that GDB for Windows ( at least the one shipped with Wascana ) returns lower
+		// [example C, observed with cygwin and mingw]
-		// case "thread" , so the code needs to be case-insensitive. Also since the original code wanted
+		//   2 thread 5264.0x608  0x7c90eb94 in ntdll!LdrAccessResource ()
-		// to favor the LWP info, we will leave this in. Only if it does not come up with a match will we
+		//    from /cygdrive/c/WINDOWS/system32/ntdll.dll
-		// default to the more general algorithm.
+		// * 1 thread 5264.0x16f8  main (argc=1, argv=0x661f00) at MultiThread.cc:16
-
+		//
+		// Note that windows gdbs returns lower case "thread" , so the matcher 
+		// needs to be case-insensitive. 
+		//
+		// The original code favored the format in example A and so we will 
+		// continue to give it precedence. The newly added support for formats 
+		// B and C will have lower precedence.
 		if(str.length() > 0 ){
-			Matcher matcher = RESULT_PATTERN_LWP.matcher(str);
+			Matcher matcher = RESULT_PATTERN_LWP.matcher(str);	// example A
 			boolean isCurrentThread = false;
 			if (matcher.find()) {
 				String id = matcher.group(1).trim();
@@ -119,7 +153,7 @@ public class CLIInfoThreadsInfo extends MIInfo {
 				info.add(new ThreadInfo(id, matcher.group(5), "", isCurrentThread)); //$NON-NLS-1$
 			} 
 			else {
-				matcher = RESULT_PATTERN_LWP.matcher(str);
+				matcher = RESULT_PATTERN.matcher(str);	// examples B and C
 				if (matcher.find()) {
 					String id = matcher.group(1).trim();
 					if (id.charAt(0) == '*') {