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Solaris 8 -> Solaris 10 = problem :/

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Operating Systems Solaris Solaris 8 -> Solaris 10 = problem :/
# 1  
Old 03-28-2011
Solaris 8 -> Solaris 10 = problem :/
Hello,

I have a multithreading program (just two threads) which works on Solaris 8. I use pthread library to synchronize threads.
I try to run it on Solaris 10 (on another computer). All sources was re-compiled but behaviour of my program is not the same. The thread 2 is never executed when thread 1 is waiting.

example :
Code:
thread 1 beginning                       
                                             thread2 beginning
process
                                             process
process ...
... pthread_cond_wait(...);
(so thread waits a signal from thread 2)

but the program never come back to thread 2 whereas it works on Solaris 8.Smilie

Thanks in advance.
# 2  
Old 03-28-2011
Do both threads get started under Solaris 10, or just one of them? Are you mutexes and condition variables properly initialized?

What does truss show when you try to run your process? What does pstack show when your second thread isn't working right?

There were significant changes in the thread libraries in the migration from Solaris 8 to Solaris 10. If there's anything at all wrong with your code, something like this could happen all too easily, especially if you're moving from an early or unpatched version of Solaris 8 and/or Sun Studio.

Compiling and linking options can be critical, too. If your code is C++, read the CC documentation and pay particular attention to the "-mt" section of the man page.
# 3  
Old 03-29-2011
They start on the same OS (solaris 8 when it works, solaris 10 when it does'nt work).

Thread 1 (very simplification of source code) :
Code:
 
main_function {  /*(called every 20ms)*/
 
   (... some functions ...)
 
   pthread_mutex_lock(&mutexA);
   Read_data1;
   Read_data2;
   if (Status1)     {
      Status1=0;
      pthread_cond_wait(&synchroA,&mutexA);
   }
   else {
      pthread_cond_signal(&synchroB);
      Status2=1;
   }
   pthread_mutex_unlock(&mutexA);
 
   (... some functions ...)
 
   pthread_mutex_lock(&mutexA);
   Write_data3;
   Write_data4;
   if (Status2)     {
      Status2=0;
      pthread_cond_wait(&synchroA,&mutexA);
   }
   else {
      pthread_cond_signal(&synchroB);
      Status2=1;
   }
   pthread_mutex_unlock(&mutexA);
 
   Read_data5
}

Thread 2 is the same code with mutexB instead of mutexA, and synchroB instead of synchroA.

On Solaris 8 : no problem.
On Solaris 10 : On the first pthread_cond_wait (in thread 1 per example), program never returns to thread2 for mystery reasons.
# 4  
Old 04-24-2011
Hi Tinkh,

My guess: This might also not work on Solaris 8, if you set the concurrency level to at least 2.
Code:
   if (Status2)     {
      Status2=0;
      pthread_cond_wait(&synchroA,&mutexA);
   }
   else {
      pthread_cond_signal(&synchroB);
      Status2=1;
   }

Should'nt it be Status1=1 after the pthread_cond_wait() ?

HTH, Loïc
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