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Merge pull request #3151 from HiFiPhile/lock_cnt

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osal/none: add nested count to spin lock
This commit is contained in:
Ha Thach
2025-11-19 17:44:32 +07:00
committed by GitHub
parent 6daf07bb92 650c4b061c
commit 284895bd9c
1 changed files with 18 additions and 3 deletions
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21
src/osal/osal_none.h
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@ -34,26 +34,41 @@ extern "C" {
//--------------------------------------------------------------------+
// Spinlock API
//--------------------------------------------------------------------+
// Note: This implementation is designed for bare-metal single-core systems without RTOS.
// - Supports nested locking within the same execution context
// - NOT suitable for true SMP (Symmetric Multi-Processing) systems
// - NOT thread-safe for multi-threaded environments
// - Primarily manages interrupt enable/disable state for critical sections
typedef struct {
void (* interrupt_set)(bool enabled);
uint32_t nested_count;
} osal_spinlock_t;
// For SMP, spinlock must be locked by hardware, cannot just use interrupt
#define OSAL_SPINLOCK_DEF(_name, _int_set) \
osal_spinlock_t _name = { .interrupt_set = _int_set }
osal_spinlock_t _name = { .interrupt_set = _int_set, .nested_count = 0 }
TU_ATTR_ALWAYS_INLINE static inline void osal_spin_init(osal_spinlock_t *ctx) {
(void) ctx;
}
TU_ATTR_ALWAYS_INLINE static inline void osal_spin_lock(osal_spinlock_t *ctx, bool in_isr) {
if (!in_isr) {
// Disable interrupts first to make nested_count increment atomic
if (!in_isr && ctx->nested_count == 0) {
ctx->interrupt_set(false);
}
ctx->nested_count++;
}
TU_ATTR_ALWAYS_INLINE static inline void osal_spin_unlock(osal_spinlock_t *ctx, bool in_isr) {
if (!in_isr) {
if (ctx->nested_count == 0) {
return; // spin is not locked to begin with
}
ctx->nested_count--;
// Only re-enable interrupts when fully unlocked
if (!in_isr && ctx->nested_count == 0) {
ctx->interrupt_set(true);
}
}