Bug Workaround - locking

- Added support for the "locking" configuration variable that disables
  file locking.  This can be helpful to folks who use task on Solaris,
  and store their task data files on an NFS mount.

src/TDB.cpp

@@ -38,6 +38,7 @@ TDB::TDB ()
 : mPendingFile ("")
 , mCompletedFile ("")
 , mId (1)
+, mNoLock (false)
 {
 }
 
@@ -289,6 +290,9 @@ bool TDB::modifyT (const T& t)
 ////////////////////////////////////////////////////////////////////////////////
 bool TDB::lock (FILE* file) const
 {
+  if (mNoLock)
+    return true;
+
   return flock (fileno (file), LOCK_EX) ? false : true;
 }
 
@@ -300,8 +304,9 @@ bool TDB::overwritePending (std::vector <T>& all)
   if ((out = fopen (mPendingFile.c_str (), "w")))
   {
     int retry = 0;
-    while (flock (fileno (out), LOCK_EX) && ++retry <= 3)
-      delay (0.25);
+    if (!mNoLock)
+      while (flock (fileno (out), LOCK_EX) && ++retry <= 3)
+        delay (0.1);
 
     std::vector <T>::iterator it;
     for (it = all.begin (); it != all.end (); ++it)
@@ -322,8 +327,9 @@ bool TDB::writePending (const T& t)
   if ((out = fopen (mPendingFile.c_str (), "a")))
   {
     int retry = 0;
-    while (flock (fileno (out), LOCK_EX) && ++retry <= 3)
-      delay (0.25);
+    if (!mNoLock)
+      while (flock (fileno (out), LOCK_EX) && ++retry <= 3)
+        delay (0.1);
 
     fputs (t.compose ().c_str (), out);
 
@@ -342,8 +348,9 @@ bool TDB::writeCompleted (const T& t)
   if ((out = fopen (mCompletedFile.c_str (), "a")))
   {
     int retry = 0;
-    while (flock (fileno (out), LOCK_EX) && ++retry <= 3)
-      delay (0.25);
+    if (!mNoLock)
+      while (flock (fileno (out), LOCK_EX) && ++retry <= 3)
+        delay (0.1);
 
     fputs (t.compose ().c_str (), out);
 
@@ -367,8 +374,9 @@ bool TDB::readLockedFile (
     if ((in = fopen (file.c_str (), "r")))
     {
       int retry = 0;
-      while (flock (fileno (in), LOCK_EX) && ++retry <= 3)
-        delay (0.25);
+      if (!mNoLock)
+        while (flock (fileno (in), LOCK_EX) && ++retry <= 3)
+          delay (0.1);
 
       char line[T_LINE_MAX];
       while (fgets (line, T_LINE_MAX, in))
@@ -432,4 +440,10 @@ int TDB::nextId ()
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+void TDB::noLock ()
+{
+  mNoLock = true;
+}
+
+////////////////////////////////////////////////////////////////////////////////