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esp32/machine_uart: Release GIL for blocking reads. 

If we're reading from an UART with a non-zero timeout, we can release the
GIL so that other threads/tasks may run while we are sleeping waiting for
data to arrive.

Signed-off-by: Daniël van de Giessen <daniel@dvdgiessen.nl>
This commit is contained in:
Daniël van de Giessen 2022-11-23 14:20:58 +01:00
parent f8bd6778c8
commit 3cc3e4e032
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1 changed files with 9 additions and 0 deletions
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9
ports/esp32/machine_uart.c
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@ -472,8 +472,17 @@ STATIC mp_uint_t machine_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t siz
time_to_wait = pdMS_TO_TICKS(self->timeout);
}
bool release_gil = time_to_wait > 0;
if (release_gil) {
MP_THREAD_GIL_EXIT();
}
int bytes_read = uart_read_bytes(self->uart_num, buf_in, size, time_to_wait);
if (release_gil) {
MP_THREAD_GIL_ENTER();
}
if (bytes_read <= 0) {
*errcode = MP_EAGAIN;
return MP_STREAM_ERROR;