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Code Issues Releases Wiki Activity

Always perform select() when loop duration exceeds interval (#9058)

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This commit is contained in:
J. Nick Koston 2025-06-11 22:27:10 -05:00 committed by GitHub
parent 261b561bb2
commit dac738a916
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2 changed files with 13 additions and 7 deletions
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18
esphome/core/application.cpp
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@ -117,7 +117,9 @@ void Application::loop() {
// Use the last component's end time instead of calling millis() again
auto elapsed = last_op_end_time - this->last_loop_;
if (elapsed >= this->loop_interval_ || HighFrequencyLoopRequester::is_high_frequency()) {
yield();
// Even if we overran the loop interval, we still need to select()
// to know if any sockets have data ready
this->yield_with_select_(0);
} else {
uint32_t delay_time = this->loop_interval_ - elapsed;
uint32_t next_schedule = this->scheduler.next_schedule_in().value_or(delay_time);
@ -126,7 +128,7 @@ void Application::loop() {
next_schedule = std::max(next_schedule, delay_time / 2);
delay_time = std::min(next_schedule, delay_time);
this->delay_with_select_(delay_time);
this->yield_with_select_(delay_time);
}
this->last_loop_ = last_op_end_time;
@ -215,7 +217,7 @@ void Application::teardown_components(uint32_t timeout_ms) {
// Give some time for I/O operations if components are still pending
if (!pending_components.empty()) {
this->delay_with_select_(1);
this->yield_with_select_(1);
}
// Update time for next iteration
@ -293,8 +295,6 @@ bool Application::is_socket_ready(int fd) const {
// This function is thread-safe for reading the result of select()
// However, it should only be called after select() has been executed in the main loop
// The read_fds_ is only modified by select() in the main loop
if (HighFrequencyLoopRequester::is_high_frequency())
return true; // fd sets via select are not updated in high frequency looping - so force true fallback behavior
if (fd < 0 || fd >= FD_SETSIZE)
return false;
@ -302,7 +302,9 @@ bool Application::is_socket_ready(int fd) const {
}
#endif
void Application::delay_with_select_(uint32_t delay_ms) {
void Application::yield_with_select_(uint32_t delay_ms) {
// Delay while monitoring sockets. When delay_ms is 0, always yield() to ensure other tasks run
// since select() with 0 timeout only polls without yielding.
#ifdef USE_SOCKET_SELECT_SUPPORT
if (!this->socket_fds_.empty()) {
// Update fd_set if socket list has changed
@ -340,6 +342,10 @@ void Application::delay_with_select_(uint32_t delay_ms) {
ESP_LOGW(TAG, "select() failed with errno %d", errno);
delay(delay_ms);
}
// When delay_ms is 0, we need to yield since select(0) doesn't yield
if (delay_ms == 0) {
yield();
}
} else {
// No sockets registered, use regular delay
delay(delay_ms);

2
esphome/core/application.h
View File

@ -575,7 +575,7 @@ class Application {
void feed_wdt_arch_();
/// Perform a delay while also monitoring socket file descriptors for readiness
void delay_with_select_(uint32_t delay_ms);
void yield_with_select_(uint32_t delay_ms);
std::vector<Component *> components_{};
std::vector<Component *> looping_components_{};