pSOSystem System Calls - Read

t_mode pSOS+ System Calls
Target
T_ISR / T_NOISR Hardware interrupts are enabled / disabled while the task
runs.
These options are available only on certain processors. See
“Interrupt Control” under “Target.”
T_LEVELMASK0
through
T_LEVELMASKn
To create the argument new_mode, you pick symbolic constants from the pairs
described above. For instance, to specify that a task have preemption turned off,
you place the symbolic constant T_NOPREEMPT in new_mode. To specify that the
task have preemption turned off and roundrobin by time-slicing turned on, you
place both T_NOPREEMPT and T_TSLICE in new_mode, using the following syntax:
T_NOPREEMPT | T_TSLICE
The argument mask specifies the bit mask used to permit attribute modifications,
and as such, it must contain both of the symbolic constants from each pair whose
attribute is to be modified. For instance, to enable modification of preemption mode,
you place both T_PREEMPT and T_NOPREEMPT in mask. To enable modification of
both preemption mode and roundrobin mode, you place both symbolic constants
from both pairs in mask, as below:
T_PREEMPT | T_NOPREEMPT | T_NOTSLICE | T_TSLICE
Interrupt Control
Certain hardware interrupts are disabled while the task runs.
These options are available only on certain processors. See
“Interrupt Control” under “Target.”
Interrupt control means that while a task is executing, hardware interrupts are
disabled. On some processors, you can disable all interrupts at or below a certain
interrupt level and enable all interrupts above that level. On other processors you
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