github/esphome
2
0
Fork 0
mirror of https://github.com/esphome/esphome.git synced 2026-09-13 00:07:32 +00:00
Code Issues Packages Projects Releases Wiki Activity

restore SYS_ARCH_UNPROTECT visibility comment

Browse Source
This commit is contained in:
J. Nick Koston
2026-03-01 15:35:52 -10:00
parent 1b5df15aaf
commit 52f76a4f43
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
esphome/core/lwip_fast_select.h
+3 -1
View File
@@ -43,7 +43,9 @@ struct lwip_sock *esphome_lwip_get_sock(int fd);
static inline bool esphome_lwip_socket_has_data(struct lwip_sock *sock) {
// Unlocked hint read — no lwIP core lock needed.
// volatile prevents the compiler from caching/reordering this cross-thread read.
// Aligned 16-bit reads are single-instruction loads (L16SI/LH/LDRH) on
// The write side (TCP/IP thread) commits via SYS_ARCH_UNPROTECT which releases a
// FreeRTOS mutex (ESP32) or resumes the scheduler (LibreTiny), ensuring the value
// is visible. Aligned 16-bit reads are single-instruction loads (L16SI/LH/LDRH) on
// Xtensa/RISC-V/ARM and cannot produce torn values.
return *(volatile int16_t *) ((char *) sock + (int) ESPHOME_LWIP_SOCK_RCVEVENT_OFFSET) > 0;
}