Error when using RTEMS_MICROSECONDS_TO_TICKS

[Joel Sherrill]

On Tue, May 11, 2021 at 1:11 AM Gedare Bloom <gedare at rtems.org> wrote:

> On Sun, May 9, 2021 at 9:33 AM Richi Dubey <richidubey at gmail.com> wrote:
> >
> > Hi,
> >
> > I am using the line:
> rtems_task_wake_after(RTEMS_MICROSECONDS_TO_TICKS(6000)); in my test
> program to emulate a 6 seconds sleep. But when I deubg the program using
> qemu, I do not see it waiting for 6 seconds; on debugging, there is a error
> of a shared library file not found, which leads to the ticks being 0. Can
> someone please help?
> >
>
> Yes, 6000 microseconds isn't 6 seconds.
>

Use (rtems_clock_get_ticks_per_second() * 6) as documented here:

https://docs.rtems.org/releases/rtems-docs-4.11.2/c-user/clock_manager.html#rtems-clock-get-ticks-per-second


But if you are on a simulator, it won't match 6 seconds of "real world
time". Simulators run at a different speed than "real time" and 6 seconds
of simulated processor time could take much less or much more time. Depends
on the simulator, target processor, and the host computer.


>
> > Debug log:
> >
> >
> ----------------------------------------------------------------------------------------------------------
> > 35  rtems_task_wake_after(RTEMS_MICROSECONDS_TO_TICKS(6000));
> > (gdb) si
> > 0x00101176 135  rtems_task_wake_after(RTEMS_MICROSECONDS_TO_TICKS(6000));
> > (gdb)
> > 0x00101178 135  rtems_task_wake_after(RTEMS_MICROSECONDS_TO_TICKS(6000));
> > (gdb)
> > 0x0010117c 135  rtems_task_wake_after(RTEMS_MICROSECONDS_TO_TICKS(6000));
> > (gdb)
> > __udivsi3 () at
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S:1104
> > 1104
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S: No
> such file or directory.
> > (gdb)
> > 1105 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb) ni
> > 1106 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb)
> > 1107 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb) si
> > 1108 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb) ni
> > 1109 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb)
> > 1118 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb)
> > 1119 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb)
> > 1120 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb)
> > 1121 in
> ../../../../../../gnu-mirror-gcc-57b5da3/libgcc/config/arm/lib1funcs.S
> > (gdb)
> > 0x00101180 in test () at
> ../../../testsuites/smptests/smpschededf05/init.c:135
> > 135  rtems_task_wake_after(RTEMS_MICROSECONDS_TO_TICKS(6000));
> > (gdb) si
> > 0x00101182 135  rtems_task_wake_after(RTEMS_MICROSECONDS_TO_TICKS(6000));
> > (gdb)
> > 0x00101184 135  rtems_task_wake_after(RTEMS_MICROSECONDS_TO_TICKS(6000));
> > (gdb)
> > rtems_task_wake_after (ticks=16777216) at
> ../../../cpukit/rtems/src/taskwakeafter.c:30
> > 30 {
> > (gdb)
> > 0x00108b44 30 {
> > (gdb) ni
> > 0x00108b46 30 {
> > (gdb)
> > 0x00108b48 30 {
> > (gdb)
> > 38  cpu_self = _Thread_Dispatch_disable();
> > (gdb)
> > 0x00108b4e 38  cpu_self = _Thread_Dispatch_disable();
> > (gdb)
> > 39    executing = _Per_CPU_Get_executing( cpu_self );
> > (gdb)
> > 0x00108b52 39    executing = _Per_CPU_Get_executing( cpu_self );
> > (gdb)
> > 0x00108b56 39    executing = _Per_CPU_Get_executing( cpu_self );
> > (gdb)
> > 41    if ( ticks == 0 ) {
> > (gdb)
> > 0x00108b5a 41    if ( ticks == 0 ) {
> > (gdb) p ticks
> > $1 = 0
> > (gdb)
> >
> >
> ----------------------------------------------------------------------------------------------------------
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