patch for join and periodic timers from Jakob Scov-Pedersen

[Federico Montesino Pouzols]

        Hi, Jakob Skov-Pedersen has recently submitted thrugh savannah
the patch included below. It adds a new method (Thread::join) and a
bool parameter for setTimer, which allows for setting a periodic
timer.

        Since there has been a discussion about threads, some people
may have comments about this patch. I would apply it for both the next
1.0 release and the 1.1 release, just adding a comment stating that
the periodic timer will be available only where itimer is available,
and adding the 'false' default value for the bool parameter of
setTimer.

-----------

diff -rc2P commoncpp2-1.0.7/ChangeLog commoncpp2-1.0.7-jasp2/ChangeLog
*** commoncpp2-1.0.7/ChangeLog  Mon Nov 25 20:38:32 2002
--- commoncpp2-1.0.7-jasp2/ChangeLog    Thu Dec  5 19:50:35 2002
***************
*** 1,2 ****
--- 1,4 ----
+ From 1.0.7 to 1.0.7-jasp
+ - timer in PosixThread can now be periodic, I think
  From Common C++ 2 1.0.6 to 1.0.7
  - socketport attach() stuff.
diff -rc2P commoncpp2-1.0.7/include/cc++/thread.h 
commoncpp2-1.0.7-jasp2/include/cc++/thread.h
*** commoncpp2-1.0.7/include/cc++/thread.h      Sun Nov 10 05:19:36 2002
--- commoncpp2-1.0.7-jasp2/include/cc++/thread.h        Thu Dec  5 20:18:51 2002
***************
*** 1069,1072 ****
--- 1069,1073 ----
        friend class Slog;
  
+       Semaphore joinSem;
        static Thread* _main;
  
***************
*** 1341,1344 ****
--- 1342,1350 ----
  
        /**
+        * Blocking call which unlucks when thread terminates
+        */
+       void join(void);
+       
+       /**
         * Get exception mode of the current thread.
         *
***************
*** 1475,1480 ****
         * 
         * @param timer timeout in milliseconds.
         */
!       void setTimer(timeout_t timer);
        
        /**
--- 1481,1487 ----
         * 
         * @param timer timeout in milliseconds.
+        * @param recuring should the timer be periodic
         */
!       void setTimer(timeout_t timer, bool periodic);
        
        /**
diff -rc2P commoncpp2-1.0.7/src/thread.cpp commoncpp2-1.0.7-jasp2/src/thread.cpp
*** commoncpp2-1.0.7/src/thread.cpp     Sun Nov 10 05:19:37 2002
--- commoncpp2-1.0.7-jasp2/src/thread.cpp       Thu Dec  5 20:25:10 2002
***************
*** 276,279 ****
--- 276,283 ----
  }
  
+ void Thread::join(void) {
+       joinSem.wait();
+ }
+ 
  /*
   * End Suspend/Resume stuff
***************
*** 825,828 ****
--- 829,833 ----
                priv->_tid = 0;
        }
+       joinSem.post();
  }
  
***************
*** 1253,1257 ****
  }
  
! void  PosixThread::setTimer(timeout_t timer)
  {
        sigset_t sigs;
--- 1258,1262 ----
  }
  
! void  PosixThread::setTimer(timeout_t timer, bool periodic)
  {
        sigset_t sigs;
***************
*** 1263,1266 ****
--- 1268,1275 ----
        itimer.it_value.tv_usec = (timer * 1000) % 1000000;
        itimer.it_value.tv_sec = timer / 1000;
+       if (periodic) {
+               itimer.it_interval.tv_usec = itimer.it_value.tv_usec;
+               itimer.it_interval.tv_sec = itimer.it_value.tv_sec;
+       }
  #else
        timer /= 1000;