Merge branch 'feature/linux_improve_delay_func' into 'master'

feat(esp_rom): Improves esp_rom_delay_us for linux target

See merge request espressif/esp-idf!30217

components/esp_rom/linux/esp_rom_sys.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -10,6 +10,8 @@
 #include <stdarg.h>
 #include <assert.h>
 #include <unistd.h>
+#include <errno.h>
+#include <time.h>
 #include "esp_rom_sys.h"
 
 static void call_linux_putc(char c);
@@ -264,9 +266,16 @@ int esp_rom_printf(const char *fmt, ...)
 
 void esp_rom_delay_us(uint32_t us)
 {
-    int sleep_result = usleep(us);
-    assert(sleep_result == 0);
-    (void)sleep_result; // Prevents compiler from optimizing out usleep() due to unused result. Also prevents warning.
+    struct timespec wait_time = {
+        .tv_sec = us / 1000000,
+        .tv_nsec = us % 1000000 * 1000,
+    };
+    /*
+        If nanosleep() is interrupted by a signal handler, nanosleep()
+        returns -1, sets errno to EINTR, and writes the remaining time.
+        The remaining time is used to call nanosleep() again and complete the specified pause.
+    */
+    while (nanosleep(&wait_time, &wait_time) == -1 && errno == EINTR) { };
 }
 
 void esp_rom_install_channel_putc(int channel, void (*putc)(char c))

tools/test_apps/linux_compatible/linux_freertos/components/kernel_tests/tasks/test_freertos_task_delete.c

@@ -60,7 +60,7 @@ static void tsk_blocks_frequently(void *param)
     }
 }
 
-TEST_CASE("FreeRTOS Delete Blocked Tasks", "[freertos][ignore]") // TODO: esp_rom_delay_us is interrupted by signal
+TEST_CASE("FreeRTOS Delete Blocked Tasks", "[freertos]")
 {
     TaskHandle_t blocking_tasks[configNUM_CORES + 1]; // one per CPU, plus one unpinned task
     tsk_blocks_param_t params[configNUM_CORES + 1] = { 0 };