py: Add hooks for Zephyr threading integration.

Add support for port-overridable GIL macros in mpthread.h, allowing ports
to inject k_yield() for cooperative scheduling.

Minor adjustments to gc.c and modthread.c for Zephyr threading compatibility.

Signed-off-by: Andrew Leech <[email protected]>

Author: pi-anl

py/gc.c

@@ -27,10 +27,13 @@
 
 #include <assert.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include "py/gc.h"
 #include "py/runtime.h"
+#include "py/mpthread.h"
+#include "py/mphal.h"
 
 #if MICROPY_DEBUG_VALGRIND
 #include <valgrind/memcheck.h>
@@ -214,7 +217,9 @@ void gc_init(void *start, void *end) {
     #endif
 
     // unlock the GC
+    #if MICROPY_PY_THREAD
     MP_STATE_THREAD(gc_lock_depth) = 0;
+    #endif
 
     // allow auto collection
     MP_STATE_MEM(gc_auto_collect_enabled) = 1;

py/modthread.c

@@ -169,7 +169,6 @@ static void *thread_entry(void *args_in) {
 
     MP_THREAD_GIL_ENTER();
 
-    // signal that we are set up and running
     mp_thread_start();
 
     // TODO set more thread-specific state here:
@@ -196,7 +195,11 @@ static void *thread_entry(void *args_in) {
         }
     }
 
+    #if !MICROPY_ZEPHYR_THREADING
     DEBUG_printf("[thread] finish ts=%p\n", &ts);
+    #else
+    DEBUG_printf("[thread] finish\n");
+    #endif
 
     // signal that we are finished
     mp_thread_finish();

py/mpthread.h

@@ -58,11 +58,20 @@ void mp_thread_recursive_mutex_unlock(mp_thread_recursive_mutex_t *mutex);
 
 #if MICROPY_PY_THREAD && MICROPY_PY_THREAD_GIL
 #include "py/mpstate.h"
+// Allow ports to override GIL macros (e.g., to add k_yield() for cooperative scheduling)
+#ifndef MP_THREAD_GIL_ENTER
 #define MP_THREAD_GIL_ENTER() mp_thread_mutex_lock(&MP_STATE_VM(gil_mutex), 1)
+#endif
+#ifndef MP_THREAD_GIL_EXIT
 #define MP_THREAD_GIL_EXIT() mp_thread_mutex_unlock(&MP_STATE_VM(gil_mutex))
+#endif
 #else
+#ifndef MP_THREAD_GIL_ENTER
 #define MP_THREAD_GIL_ENTER()
+#endif
+#ifndef MP_THREAD_GIL_EXIT
 #define MP_THREAD_GIL_EXIT()
 #endif
+#endif
 
 #endif // MICROPY_INCLUDED_PY_MPTHREAD_H

py/qstrdefs.h

@@ -76,3 +76,6 @@ Q(/rom/lib)
 #if MICROPY_ENABLE_PYSTACK
 Q(pystack exhausted)
 #endif
+
+// Special methods
+Q(__del__)