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| author | Andrew Tridgell <tridge@samba.org> | 2013-08-28 18:31:27 +1000 |
|---|---|---|
| committer | Lorenz Meier <lm@inf.ethz.ch> | 2013-08-28 11:16:30 +0200 |
| commit | fdbc09e2a53281b8dda7c48676dcf695a79ba373 (patch) | |
| tree | fbd2549feee63bf5936dcd44644ac9688eecffc1 /src/drivers/airspeed | |
| parent | ad732ee3a146b40c2b600eb78f804086105a4c57 (diff) | |
| download | px4-firmware-fdbc09e2a53281b8dda7c48676dcf695a79ba373.tar.gz px4-firmware-fdbc09e2a53281b8dda7c48676dcf695a79ba373.tar.bz2 px4-firmware-fdbc09e2a53281b8dda7c48676dcf695a79ba373.zip | |
avoid counters going above limit in INCREMENT()
when using INCREMENT() the counter would temporarily read equal to
limit, which could cause an issue if the task is preempted.
(this macro should be in a common header, though which header?)
Diffstat (limited to 'src/drivers/airspeed')
| -rw-r--r-- | src/drivers/airspeed/airspeed.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/drivers/airspeed/airspeed.h b/src/drivers/airspeed/airspeed.h index 89dfb22d7..b87494b40 100644 --- a/src/drivers/airspeed/airspeed.h +++ b/src/drivers/airspeed/airspeed.h @@ -165,5 +165,5 @@ protected: }; /* helper macro for handling report buffer indices */ -#define INCREMENT(_x, _lim) do { _x++; if (_x >= _lim) _x = 0; } while(0) +#define INCREMENT(_x, _lim) do { __typeof__(_x) _tmp = _x+1; if (_tmp >= _lim) _tmp = 0; _x = _tmp; } while(0) |