uint8_t pm_buffer_block_acquire(pm_buffer_t * p_buffer, uint32_t n_blocks) { if (!BUFFER_IS_VALID(p_buffer)) { return ( BUFFER_INVALID_ID ); } uint8_t first_locked_mutex = BUFFER_INVALID_ID; for (uint8_t i = 0; i < p_buffer->n_blocks; i++) { if (pm_mutex_lock(p_buffer->p_mutex, i)) { if (first_locked_mutex == BUFFER_INVALID_ID) { first_locked_mutex = i; } if ((i - first_locked_mutex + 1) == n_blocks) { return first_locked_mutex; } } else if (first_locked_mutex != BUFFER_INVALID_ID) { for (uint8_t j = first_locked_mutex; j < i; j++) { pm_buffer_release(p_buffer, j); } first_locked_mutex = BUFFER_INVALID_ID; } } return ( BUFFER_INVALID_ID ); }
static pm_peer_id_t claim(pm_peer_id_t peer_id, uint8_t * mutex_group) { pm_peer_id_t allocated_peer_id = PM_PEER_ID_INVALID; if (peer_id == PM_PEER_ID_INVALID) { allocated_peer_id = pm_mutex_lock_first_available(mutex_group, PM_PEER_ID_N_AVAILABLE_IDS); if (allocated_peer_id == PM_PEER_ID_N_AVAILABLE_IDS) { allocated_peer_id = PM_PEER_ID_INVALID; } } else if (peer_id < PM_PEER_ID_N_AVAILABLE_IDS) { bool lock_success = pm_mutex_lock(mutex_group, peer_id); allocated_peer_id = lock_success ? peer_id : PM_PEER_ID_INVALID; } return allocated_peer_id; }