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rp2: Migrate to the new mp_thread_recursive_mutex_t.

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Necessary for GC support, also refactored pendsv usage.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>
This commit is contained in:
Angus Gratton
2024-12-10 14:51:10 +11:00
committed by Damien George
parent 4bcbe88e74
commit 3bfedd0f4a
3 changed files with 28 additions and 10 deletions
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14
ports/rp2/pendsv.c
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@@ -26,7 +26,7 @@
#include <assert.h>
#include "py/mpconfig.h"
#include "mutex_extra.h"
#include "py/mpthread.h"
#include "pendsv.h"
#if PICO_RP2040
@@ -47,21 +47,21 @@ void PendSV_Handler(void);
// Using the nowait variant here as softtimer updates PendSV from the loop of mp_wfe_or_timeout(),
// where we don't want the CPU event bit to be set.
static recursive_mutex_nowait_t pendsv_mutex;
static mp_thread_recursive_mutex_t pendsv_mutex;
void pendsv_init(void) {
recursive_mutex_nowait_init(&pendsv_mutex);
mp_thread_recursive_mutex_init(&pendsv_mutex);
}
void pendsv_suspend(void) {
// Recursive Mutex here as either core may call pendsv_suspend() and expect
// both mutual exclusion (other core can't enter pendsv_suspend() at the
// same time), and that no PendSV handler will run.
recursive_mutex_nowait_enter_blocking(&pendsv_mutex);
mp_thread_recursive_mutex_lock(&pendsv_mutex, 1);
}
void pendsv_resume(void) {
recursive_mutex_nowait_exit(&pendsv_mutex);
mp_thread_recursive_mutex_unlock(&pendsv_mutex);
// Run pendsv if needed. Find an entry with a dispatch and call pendsv dispatch
// with it. If pendsv runs it will service all slots.
@@ -97,7 +97,7 @@ void pendsv_schedule_dispatch(size_t slot, pendsv_dispatch_t f) {
// PendSV interrupt handler to perform background processing.
void PendSV_Handler(void) {
if (!recursive_mutex_nowait_try_enter(&pendsv_mutex, NULL)) {
if (!mp_thread_recursive_mutex_lock(&pendsv_mutex, 0)) {
// Failure here means core 1 holds pendsv_mutex. ISR will
// run again after core 1 calls pendsv_resume().
return;
@@ -117,5 +117,5 @@ void PendSV_Handler(void) {
}
}
recursive_mutex_nowait_exit(&pendsv_mutex);
mp_thread_recursive_mutex_unlock(&pendsv_mutex);
}