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#!N
#!CNavyBlue #!N #!Rplsm Parallelism
#!N #!EC #!CIndianRed #!N #!N #!N #!F-adobe-times-bold-r-normal--18* Note on Use #!N
#!N Modules used exclusively in a uniprocessor environment do not require
any of the routines described in this section. However, modules that
use these routines on a parallel processor can also be run
on a uniprocessor without changing any code. #!N #!N #!EC #!N
#!N Task Groups constitute a mechanism for specifying a collection of
tasks to be performed in parallel on a multiprocessor. The task
model provides simple fork/join semantics, suitable for coarse-grain parallelism: #!N #!I0
#!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. Begin a collection of
tasks to be executed in parallel (with #!F-adobe-times-bold-r-normal--18* DXCreateTaskGroup() #!EF )
#!N #!I30 #!N 2. Specify each task (with #!F-adobe-times-bold-r-normal--18* DXAddTask() #!EF
) #!N #!I30 #!N 3. Complete the task Group and begin
execution (with #!F-adobe-times-bold-r-normal--18* DXExecuteTaskGroup() #!EF ). Creating all the tasks first
simplifies the model and allows optimal scheduling on the basis of
estimated task-completion times. #!N #!I0 #!N #!EF #!N #!CIndianRed #!N #!N
#!N #!F-adobe-times-bold-r-normal--18* Notes on Use #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N
#!I30 #!N o It is important that all information required by
parallel tasks be in global memory. This condition is generally met
by passing Objects to tasks, since all Objects are in global
memory. #!N #!I30 #!N o Tasks must not attempt to modify
the same data structures simultaneously, with the exception of adding members
to an existing Group (using #!F-adobe-times-bold-r-normal--18* DXSetGroupMember() #!EF ). #!N #!I0
#!N #!EF #!N #!N #!N #!EC #!N #!I0 #!N #!N #!I0
#!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* Error DXCreateTaskGroup() #!EF #!EF #!I50 #!N Starts a
new Group of tasks to be run in parallel. See #!Ldxctg,dxall1192 h DXCreateTaskGroup #!EL
. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* Error DXAddTask() #!EF #!EF #!I50
#!N Adds a task to be run later, in parallel if
possible. See #!Ldxat,dxall1170 h DXAddTask #!EL . #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* Error DXAbortTaskGroup()
#!EF #!EF #!I50 #!N Aborts a task group without executing it.
See #!Ldxatg,dxall1163 h DXAbortTaskGroup #!EL . #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* Error DXExecuteTaskGroup() #!EF
#!EF #!I50 #!N Runs the Group of tasks in the current
Group in parallel, if possible. See #!Ldxetg,dxall1203 h DXExecuteTaskGroup #!EL . #!N #!I0 #!N
#!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* int DXProcessors() #!EF #!EF #!I50 #!N Returns the number
of processors. See #!Ldxproc,dxall1335 h DXProcessors #!EL . #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* int
DXProcessorId() #!EF #!EF #!I50 #!N Returns the current processor identifier. See
#!Ldxproi,dxall1334 h DXProcessorId #!EL . #!I0 #!N #!N #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic
#!EF #!N #!N #!Lall1105,dxall1106 h Basic Data Types #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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