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added taskAllocate() function to assign tasks to workers based on id

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git-svn-id: svn://anubis/gvsu@168 45c1a28c-8058-47b2-ae61-ca45b979098e
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josh 2008-09-26 17:18:49 +00:00
parent c452c1eecb
commit 744e2ad392
1 changed files with 28 additions and 0 deletions
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28
cs677/pa2/threaded.cc
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@ -32,6 +32,34 @@ void usage(char * prog)
exit(42);
}
/*
* taskAllocate() will divide a set of total_tasks tasks into
* total_workers groups, as evenly as possible
* Parameters:
* total_tasks : IN : the total number of tasks to divide up
* total_workers : IN : the total number of workers to allocate tasks to (>0)
* this_id : IN : the id (base 0) of the task calling us for work
* first_task_id : OUT : the id (base 0) of the first task for this worker
* num : OUT : the number of tasks assigned to this worker
*/
inline void taskAllocate(int total_tasks, int total_workers, int this_id,
int * first_task_id, int * num)
{
int l_num;
int leftovers = total_tasks % total_workers; /* num of "leftover" tasks */
if (this_id < leftovers)
{
l_num = total_tasks / total_workers + 1; /* do one of the leftovers */
*first_task_id = l_num * this_id;
}
else
{
l_num = total_tasks / total_workers;
*first_task_id = l_num * this_id + leftovers;
}
*num = l_num;
}
int main(int argc, char * argv[])
{
vector<char> files[2];