target-number |
(Optional) Is an integer expression whose value is interpreted as
follows:
>=0
|
A value greater than
or equal to zero specifies execution on a specific coprocessor. The specific
coprocessor is determined as follows:
coprocessor = MOD (target-number,
number_of_coprocs)
If the correct target hardware needed to run the offloaded code is not available on the system, the program fails with an error
message.
|
<=-1
|
These values are reserved.
|
If you don't specify this argument, the runtime
system chooses whether to execute the code on the CPU or the coprocessor, and
if multiple coprocessors are available, on which coprocessor.
For example, in a
system with 4 coprocessors:
Specifying 2 or 6 tells the runtime systems to
use coprocessor 2 for the transfer, because both
MOD(2,4) and MOD(6,4) equal 2.
Specifying 1000 tells the runtime systems to
use coprocessor 0 for the transfer, because
MOD(1000,4) = 0.
|
if-specifier |
Is a Boolean expression.
If the expression evaluates to true, then execution waits for the completion of a previously initiated asynchronous data transfer or asynchronous computation. If the specified target coprocessor is absent from the system or not available at that time because it is fully loaded, then no action is taken.
If the expression evaluates to false, then no action is taken and none of the other offload clauses have any effect.
|