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Semaphore: switch to SREG = oldSREG pattern for interrupt mask/restore

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This commit is contained in:
Andrew Tridgell 2012-11-20 22:30:46 +11:00
parent da6f6f3e41
commit d6d7e2674f
1 changed files with 4 additions and 2 deletions
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6
libraries/AP_Semaphore/AP_Semaphore.cpp
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@ -22,13 +22,14 @@ AP_Semaphore::AP_Semaphore()
bool AP_Semaphore::get(void* caller)
{
bool result = false;
uint8_t oldSREG = SREG;
cli();
if( !_taken ) {
_taken = true;
_owner = caller;
result = true;
}
sei();
SREG = oldSREG;
return result;
}
@ -67,12 +68,13 @@ bool AP_Semaphore::release(void* caller)
bool AP_Semaphore::call_on_release(void* caller, ap_semaphore_callback callback_fn)
{
bool result = false;
uint8_t oldSREG = SREG;
cli();
if( _waiting_owner == NULL ) {
_waiting_owner = caller;
_waiting_callback = callback_fn;
result = true;
}
sei();
SREG = oldSREG;
return result;
}