eldo_user

Concurrency Issues
Eldo Control Language
Parallel Operation
When using the function para(), concurrency issues can emerge if some output results are stored
inside the same variable. If this happens, then ECL will generate an error. Therefore it is
strongly recommended to store results inside arrays indexed by the index of the current job.
Example: ECL issues an error because the variable res is accessed in write mode by two
different jobs:
.define_task t_assign_value (in=0, @out=0)
out=in
.end_define_task
.define_task t_main_para
set res = 0
para(t_assign_value(in=1, res=@out),
+ t_assign_value(in=2, res=@out))
fprint(stdout, "res: %d\n", res)
.end_define_task
.t_main_para
Example: fix the concurrency issue using an array.
.define_task t_assign_value (in=0, @out=0)
out=in.end_define_task
.define_task t_main_para
set res[] = 0
set i = 0
para(t_assign_value(in=1, res[ijob()]=@out),
+ t_assign_value(in=2, res[ijob()]=@out))
for (i=res.imin; i