[fpc-pascal] Threading vs Parallelism ?

[Brian]

Affinity

If a thread is dedicated to say , polling a serial or Ethernet port which
has a high input data rate , then dedicating one CPU to that task/thread is
useful.

 (Hard Affinity) with multi-core CPU's is to dedicate a specific core to a
task (thread) and just poll the input memory mapped source. This works very
well.

http://www.ibm.com/developerworks/linux/library/l-affinity/index.html#download

These Linux API functions set the affinity for processes :

    sched_set_affinity() (for altering the bitmask)
    sched_get_affinity() (for viewing the current bitmask)

These functions set the affinity for threads :

     pthread_setaffinity_np (pthread_t thread, size_t cpusetsize,  const
cpu_set_t *cpuset);
     pthread_getaffinity_np (pthread_t thread, size_t cpusetsize,  cpu_set_t
*cpuset);

They are very simple to translate into Free Pascal

Brian




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