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[dual_core_demo] use LR/SC spinlock

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stnolting 2025-02-08 10:16:00 +01:00
parent f9fc6e5f2c
commit 5210ea6dd8
1 changed files with 2 additions and 3 deletions
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5
sw/example/demo_dual_core/spinlock.c
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@ -17,7 +17,7 @@ static volatile uint32_t __spin_locked = 0;
**************************************************************************/
void spin_lock(void) {
while(__sync_lock_test_and_set(&__spin_locked, -1)); // -> amoswap.w
while(!__sync_bool_compare_and_swap(&__spin_locked, 0, -1)); // -> lr/sc
}
@ -26,6 +26,5 @@ void spin_lock(void) {
**************************************************************************/
void spin_unlock(void) {
//__sync_lock_release(&__spin_locked); // uses fence that is not required here
__sync_lock_test_and_set(&__spin_locked, 0); // -> amoswap.w
while(!__sync_bool_compare_and_swap(&__spin_locked, -1, 0)); // -> lr/sc
}