diff options
| author | Keith Packard <keithp@keithp.com> | 2011-05-18 00:12:40 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-05-18 00:12:40 -0700 |
| commit | e7e2fdf45dfbf6393ee0a0ec22e1e5ea49d6cfd5 (patch) | |
| tree | ea31fc296501fc096a4f3a7544d918ec123724aa /src-avr/ao.h | |
| parent | ce78906727aa59fc2b91f0fde4c7186b037359ff (diff) | |
src-avr: Suspend interrupts while switching stacks
Setting the stack pointer takes two instructions, so make sure we
don't get an interrupt in the middle of it. Let the restoration of
SREG set the interrupt flag as appropriate.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src-avr/ao.h')
| -rw-r--r-- | src-avr/ao.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src-avr/ao.h b/src-avr/ao.h index 242c26c7..90298a3e 100644 --- a/src-avr/ao.h +++ b/src-avr/ao.h @@ -50,7 +50,11 @@ struct ao_task { __xdata void *wchan; /* current wait channel (NULL if running) */ uint16_t alarm; /* abort ao_sleep time */ +#ifdef AVR + uint8_t *sp; /* saved stack pointer */ +#else uint8_t stack_count; /* amount of saved stack */ +#endif uint8_t task_id; /* unique id */ __code char *name; /* task name */ uint8_t stack[AO_STACK_SIZE]; /* saved stack */ |