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Advanced deferred_exec for core-side code. (#15579)

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Nick Brassel 2022-01-11 05:26:46 +11:00 • committed by GitHub
parent 05b6fbb1f5
commit 0c402157fc
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2 changed files with 147 additions and 53 deletions
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81
quantum/deferred_exec.c
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@ -9,32 +9,27 @@
# define MAX_DEFERRED_EXECUTORS 8
#endif
typedef struct deferred_executor_t {
deferred_token token;
uint32_t trigger_time;
deferred_exec_callback callback;
void * cb_arg;
} deferred_executor_t;
//------------------------------------
// Helpers
//
static deferred_token current_token = 0;
static uint32_t last_deferred_exec_check = 0;
static deferred_executor_t executors[MAX_DEFERRED_EXECUTORS] = {0};
static deferred_token current_token = 0;
static inline bool token_can_be_used(deferred_token token) {
static inline bool token_can_be_used(deferred_executor_t *table, size_t table_count, deferred_token token) {
if (token == INVALID_DEFERRED_TOKEN) {
return false;
}
for (int i = 0; i < MAX_DEFERRED_EXECUTORS; ++i) {
if (executors[i].token == token) {
for (int i = 0; i < table_count; ++i) {
if (table[i].token == token) {
return false;
}
}
return true;
}
static inline deferred_token allocate_token(void) {
static inline deferred_token allocate_token(deferred_executor_t *table, size_t table_count) {
deferred_token first = ++current_token;
while (!token_can_be_used(current_token)) {
while (!token_can_be_used(table, table_count, current_token)) {
++current_token;
if (current_token == first) {
// If we've looped back around to the first, everything is already allocated (yikes!). Need to exit with a failure.
@ -44,18 +39,22 @@ static inline deferred_token allocate_token(void) {
return current_token;
}
deferred_token defer_exec(uint32_t delay_ms, deferred_exec_callback callback, void *cb_arg) {
// Ignore queueing if it's a zero-time delay, or invalid callback
if (delay_ms == 0 || !callback) {
//------------------------------------
// Advanced API: used when a custom-allocated table is used, primarily for core code.
//
deferred_token defer_exec_advanced(deferred_executor_t *table, size_t table_count, uint32_t delay_ms, deferred_exec_callback callback, void *cb_arg) {
// Ignore queueing if the table isn't valid, it's a zero-time delay, or the token is not valid
if (!table || table_count == 0 || delay_ms == 0 || !callback) {
return INVALID_DEFERRED_TOKEN;
}
// Find an unused slot and claim it
for (int i = 0; i < MAX_DEFERRED_EXECUTORS; ++i) {
deferred_executor_t *entry = &executors[i];
for (int i = 0; i < table_count; ++i) {
deferred_executor_t *entry = &table[i];
if (entry->token == INVALID_DEFERRED_TOKEN) {
// Work out the new token value, dropping out if none were available
deferred_token token = allocate_token();
deferred_token token = allocate_token(table, table_count);
if (token == INVALID_DEFERRED_TOKEN) {
return false;
}
@ -73,15 +72,15 @@ deferred_token defer_exec(uint32_t delay_ms, deferred_exec_callback callback, vo
return INVALID_DEFERRED_TOKEN;
}
bool extend_deferred_exec(deferred_token token, uint32_t delay_ms) {
// Ignore queueing if it's a zero-time delay, or the token is not valid
if (delay_ms == 0 || token == INVALID_DEFERRED_TOKEN) {
bool extend_deferred_exec_advanced(deferred_executor_t *table, size_t table_count, deferred_token token, uint32_t delay_ms) {
// Ignore queueing if the table isn't valid, it's a zero-time delay, or the token is not valid
if (!table || table_count == 0 || delay_ms == 0 || token == INVALID_DEFERRED_TOKEN) {
return false;
}
// Find the entry corresponding to the token
for (int i = 0; i < MAX_DEFERRED_EXECUTORS; ++i) {
deferred_executor_t *entry = &executors[i];
for (int i = 0; i < table_count; ++i) {
deferred_executor_t *entry = &table[i];
if (entry->token == token) {
// Found it, extend the delay
entry->trigger_time = timer_read32() + delay_ms;
@ -93,15 +92,15 @@ bool extend_deferred_exec(deferred_token token, uint32_t delay_ms) {
return false;
}
bool cancel_deferred_exec(deferred_token token) {
// Ignore request if the token is not valid
if (token == INVALID_DEFERRED_TOKEN) {
bool cancel_deferred_exec_advanced(deferred_executor_t *table, size_t table_count, deferred_token token) {
// Ignore request if the table/token are not valid
if (!table || table_count == 0 || token == INVALID_DEFERRED_TOKEN) {
return false;
}
// Find the entry corresponding to the token
for (int i = 0; i < MAX_DEFERRED_EXECUTORS; ++i) {
deferred_executor_t *entry = &executors[i];
for (int i = 0; i < table_count; ++i) {
deferred_executor_t *entry = &table[i];
if (entry->token == token) {
// Found it, cancel and clear the table entry
entry->token = INVALID_DEFERRED_TOKEN;
@ -116,16 +115,16 @@ bool cancel_deferred_exec(deferred_token token) {
return false;
}
void deferred_exec_task(void) {
void deferred_exec_advanced_task(deferred_executor_t *table, size_t table_count, uint32_t *last_execution_time) {
uint32_t now = timer_read32();
// Throttle only once per millisecond
if (((int32_t)TIMER_DIFF_32(now, last_deferred_exec_check)) > 0) {
last_deferred_exec_check = now;
if (((int32_t)TIMER_DIFF_32(now, (*last_execution_time))) > 0) {
*last_execution_time = now;
// Run through each of the executors
for (int i = 0; i < MAX_DEFERRED_EXECUTORS; ++i) {
deferred_executor_t *entry = &executors[i];
for (int i = 0; i < table_count; ++i) {
deferred_executor_t *entry = &table[i];
// Check if we're supposed to execute this entry
if (entry->token != INVALID_DEFERRED_TOKEN && ((int32_t)TIMER_DIFF_32(entry->trigger_time, now)) <= 0) {
@ -150,3 +149,15 @@ void deferred_exec_task(void) {
}
}
}
//------------------------------------
// Basic API: used by user-mode code, guaranteed to not collide with core deferred execution
//
static uint32_t last_deferred_exec_check = 0;
static deferred_executor_t basic_executors[MAX_DEFERRED_EXECUTORS] = {0};
deferred_token defer_exec(uint32_t delay_ms, deferred_exec_callback callback, void *cb_arg) { return defer_exec_advanced(basic_executors, MAX_DEFERRED_EXECUTORS, delay_ms, callback, cb_arg); }
bool extend_deferred_exec(deferred_token token, uint32_t delay_ms) { return extend_deferred_exec_advanced(basic_executors, MAX_DEFERRED_EXECUTORS, token, delay_ms); }
bool cancel_deferred_exec(deferred_token token) { return cancel_deferred_exec_advanced(basic_executors, MAX_DEFERRED_EXECUTORS, token); }
void deferred_exec_task(void) { deferred_exec_advanced_task(basic_executors, MAX_DEFERRED_EXECUTORS, &last_deferred_exec_check); }