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.TH "rtl_allow_interrupts" "3"
.SH "NAME"
rtl_no_interrupts, rtl_restore_interruptsrtl_restore_interrupts, rtl_stop_interruptsrtl_stop_interrupts, rtl_allow_interruptsrtl_allow_interrupts \(em control the CPU interrupt state
.SH "SYNOPSIS"
.PP
.nf
.ta 8n 16n 24n 32n 40n 48n 56n 64n 72n
#include <rtl_sync.h>
void \fBrtl_no_interrupts\fP(rtl_irqstate_t \fBstate\fR);
void \fBrtl_restore_interrupts\fP(rtl_irqstate_t \fBstate\fR);
void \fBrtl_stop_interrupts\fP();
void \fBrtl_allow_interrupts\fP();
.fi
.SH "DESCRIPTION"
.PP
These functions are non-portable Realtime Linux extensions.
.PP
\fBrtl_no_interrupts\fP saves the current state of the processor interrupt flags in the variable \fBstate\fR and then disables the interrupts on this processor.
.PP
\fBrtl_restore_interrupts\fP is defined as a macro. It uses its argument to restore the interrupt state previously saved with \fBrtl_no_interrupts\fP.
.PP
\fBrtl_stop_interrupts\fP disables the interrupts.
.PP
\fBrtl_allow_interrupts\fP enables the interrupts.
.SH "EXAMPLE"
.PP
The following example demonstrates a typical usage.
.PP
.nf
.ta 8n 16n 24n 32n 40n 48n 56n 64n 72n
\f(CW {
rtl_irqstate_t irqstate;
rtl_no_interrupts(irqstate);
/* this code runs with interrupts disabled! */
rtl_restore_interrupts(irqstate);
/* interrupt state is back to what it was before */
}\fR
.fi
.PP
.SH "NOTES"
.PP
These functions only affect the interrupt flags of the current processor.
.PP
Be sure to disable hardware interrupts for short periods of time only. Do not enable interrupts in a hard signal/interrupt handler unless you
really know what you are doing.
.SH "AUTHOR"
.PP
Michael Barabanov (\fIbaraban@fsmlabs.com (link to URL mailto:baraban@fsmlabs.com) \fR)
.SH "SEE ALSO"
\fIrtl_request_irq(3) (link to URL rtl_request_irq.3.html) \fR, \fIrtl_free_irq(3) (link to URL rtl_free_irq.3.html) \fR, \fIrtl_hard_enable_irq(3) (link to URL rtl_hard_enable_irq.3.html) \fR, \fIrtl_hard_disable_irq(3) (link to URL rtl_hard_disable_irq.3.html) \fR
.PP
\(co2001 FSMLabs Inc.
.PP
All rights reserved.
...\" created by instant / docbook-to-man, Wed 13 Jun 2001, 17:58
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