esp: Update libc stubs to properly acquire/release locks.

Avoid using static mutex and recursive mutex as the resource to be
acquired/release. Instead, create a specific lock for each call if
it does not exist.

arch/risc-v/src/common/espressif/esp_libc_stubs.c

@@ -45,8 +45,6 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#define _lock_t int
-
 #define ROM_MUTEX_MAGIC   0xbb10c433
 
 /****************************************************************************
@@ -180,64 +178,108 @@ void _raise_r(struct _reent *r)
 
 void _lock_init(_lock_t *lock)
 {
-  nxmutex_init(&g_nxlock_common);
-  nxsem_get_value(&g_nxlock_common.sem, lock);
+  mutex_t *mutex = (mutex_t *)kmm_malloc(sizeof(mutex_t));
+
+  nxmutex_init(mutex);
+
+  *lock = (_lock_t)mutex;
 }
 
 void _lock_init_recursive(_lock_t *lock)
 {
-  nxmutex_init(&g_nxlock_recursive);
-  nxsem_get_value(&g_nxlock_recursive.sem, lock);
+  rmutex_t *rmutex = (rmutex_t *)kmm_malloc(sizeof(rmutex_t));
+
+  nxrmutex_init(rmutex);
+
+  *lock = (_lock_t)rmutex;
 }
 
 void _lock_close(_lock_t *lock)
 {
-  nxmutex_destroy(&g_nxlock_common);
+  mutex_t *mutex = (mutex_t *)(*lock);
+
+  nxmutex_destroy(mutex);
+  kmm_free(*lock);
   *lock = 0;
 }
 
 void _lock_close_recursive(_lock_t *lock)
 {
-  nxmutex_destroy(&g_nxlock_recursive);
+  rmutex_t *rmutex = (rmutex_t *)(*lock);
+
+  nxrmutex_destroy(rmutex);
+  kmm_free(*lock);
   *lock = 0;
 }
 
 void _lock_acquire(_lock_t *lock)
 {
-  nxmutex_lock(&g_nxlock_common);
-  nxsem_get_value(&g_nxlock_common.sem, lock);
+  if (*lock == NULL)
+    {
+      mutex_t *mutex = (mutex_t *)kmm_malloc(sizeof(mutex_t));
+
+      nxmutex_init(mutex);
+
+      *lock = (_lock_t)mutex;
+    }
+
+  nxmutex_lock((mutex_t *)(*lock));
 }
 
 void _lock_acquire_recursive(_lock_t *lock)
 {
-  nxmutex_lock(&g_nxlock_recursive);
-  nxsem_get_value(&g_nxlock_recursive.sem, lock);
+  if (*lock == NULL)
+    {
+      rmutex_t *rmutex = (rmutex_t *)kmm_malloc(sizeof(rmutex_t));
+
+      nxrmutex_init(rmutex);
+
+      *lock = (_lock_t)rmutex;
+    }
+
+  nxrmutex_lock((rmutex_t *)(*lock));
 }
 
 int _lock_try_acquire(_lock_t *lock)
 {
-  nxmutex_trylock(&g_nxlock_common);
-  nxsem_get_value(&g_nxlock_common.sem, lock);
-  return 0;
+  if (*lock == NULL)
+    {
+      mutex_t *mutex = (mutex_t *)kmm_malloc(sizeof(mutex_t));
+
+      nxmutex_init(mutex);
+
+      *lock = (_lock_t)mutex;
+    }
+
+  return nxmutex_trylock((mutex_t *)(*lock));
 }
 
 int _lock_try_acquire_recursive(_lock_t *lock)
 {
-  nxmutex_trylock(&g_nxlock_recursive);
-  nxsem_get_value(&g_nxlock_recursive.sem, lock);
-  return 0;
+  if (*lock == NULL)
+    {
+      rmutex_t *rmutex = (rmutex_t *)kmm_malloc(sizeof(rmutex_t));
+
+      nxrmutex_init(rmutex);
+
+      *lock = (_lock_t)rmutex;
+    }
+
+  return nxrmutex_trylock((rmutex_t *)(*lock));
 }
 
 void _lock_release(_lock_t *lock)
 {
-  nxmutex_unlock(&g_nxlock_common);
-  nxsem_get_value(&g_nxlock_common.sem, lock);
+  mutex_t *mutex = (mutex_t *)(*lock);
+
+  nxmutex_unlock(mutex);
 }
 
 void _lock_release_recursive(_lock_t *lock)
 {
-  nxmutex_unlock(&g_nxlock_recursive);
-  nxsem_get_value(&g_nxlock_recursive.sem, lock);
+  rmutex_t *rmutex = (rmutex_t *)(*lock);
+
+  nxrmutex_unlock(rmutex);
 }
 
 #if ESP_ROM_HAS_RETARGETABLE_LOCKING

arch/risc-v/src/common/espressif/platform_include/sys/lock.h

@@ -0,0 +1,213 @@
+/****************************************************************************
+ * arch/risc-v/src/common/espressif/platform_include/sys/lock.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#pragma once
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include_next <sys/lock.h>
+
+#ifdef _RETARGETABLE_LOCKING
+
+/****************************************************************************
+ * Public Type Definitions
+ ****************************************************************************/
+
+/* Actual platfrom-specific definition of struct __lock.
+ * The size here should be sufficient for a NuttX mutex and recursive mutex.
+ * This is checked by a static assertion in <chip>_libc_stubs.c
+ */
+
+struct __lock
+{
+  int reserved[4];
+};
+
+typedef _LOCK_T _lock_t;
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: _lock_init
+ *
+ * Description:
+ *   Allocate lock related resources.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void _lock_init(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_init_recursive
+ *
+ * Description:
+ *   Allocate recursive lock related resources.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void _lock_init_recursive(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_close
+ *
+ * Description:
+ *   Free lock related resources.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void _lock_close(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_close_recursive
+ *
+ * Description:
+ *   Free recursive lock related resources.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void _lock_close_recursive(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_acquire
+ *
+ * Description:
+ *   Acquire lock immediately after the lock object is available.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void _lock_acquire(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_acquire_recursive
+ *
+ * Description:
+ *   Acquire recursive lock immediately after the lock object is available.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void _lock_acquire_recursive(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_try_acquire
+ *
+ * Description:
+ *   Acquire lock if the lock object is available.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   Zero for success and non-zero to indicate that the lock cannot be
+ *   acquired
+ *
+ ****************************************************************************/
+
+int _lock_try_acquire(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_try_acquire_recursive
+ *
+ * Description:
+ *   Acquire recursive lock if the lock object is available.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   Zero for success and non-zero to indicate that the lock cannot be
+ *   acquired
+ *
+ ****************************************************************************/
+
+int _lock_try_acquire_recursive(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_release
+ *
+ * Description:
+ *   Relinquish the lock ownership.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void _lock_release(_lock_t *plock);
+
+/****************************************************************************
+ * Name: _lock_release_recursive
+ *
+ * Description:
+ *   Relinquish the recursive lock ownership.
+ *
+ * Input Parameters:
+ *   plock - pointer to user defined lock object
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void _lock_release_recursive(_lock_t *plock);
+
+#endif // _RETARGETABLE_LOCKING

arch/risc-v/src/esp32c3/Make.defs

@@ -20,3 +20,5 @@
 
 include common/Make.defs
 include common/espressif/Make.defs
+
+CFLAGS += ${DEFINE_PREFIX}_RETARGETABLE_LOCKING

arch/risc-v/src/esp32c6/Make.defs

@@ -20,3 +20,5 @@
 
 include common/Make.defs
 include common/espressif/Make.defs
+
+CFLAGS += ${DEFINE_PREFIX}_RETARGETABLE_LOCKING

arch/risc-v/src/esp32h2/Make.defs

@@ -20,3 +20,5 @@
 
 include common/Make.defs
 include common/espressif/Make.defs
+
+CFLAGS += ${DEFINE_PREFIX}_RETARGETABLE_LOCKING