feat(freertos): Added FreeRTOS POSIX/Linux Simulator

* Added port layer from the FreeRTOS POSIX port, added
  additional port code for ESP-IDF.
* Created another hello world example using that POSIX
  port in tools/test_apps.
* Removed old linux app

components/freertos/FreeRTOS-Kernel/portable/linux/utils/wait_for_event.c

@@ -0,0 +1,109 @@
+/*
+ * SPDX-FileCopyrightText: 2021 Amazon.com, Inc. or its affiliates
+ *
+ * SPDX-License-Identifier: MIT
+ */
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#include <pthread.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "wait_for_event.h"
+
+struct event
+{
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+    bool event_triggered;
+};
+
+struct event * event_create()
+{
+    struct event * ev = malloc( sizeof( struct event ) );
+
+    ev->event_triggered = false;
+    pthread_mutex_init( &ev->mutex, NULL );
+    pthread_cond_init( &ev->cond, NULL );
+    return ev;
+}
+
+void event_delete( struct event * ev )
+{
+    pthread_mutex_destroy( &ev->mutex );
+    pthread_cond_destroy( &ev->cond );
+    free( ev );
+}
+
+bool event_wait( struct event * ev )
+{
+    pthread_mutex_lock( &ev->mutex );
+
+    while( ev->event_triggered == false )
+    {
+        pthread_cond_wait( &ev->cond, &ev->mutex );
+    }
+
+    ev->event_triggered = false;
+    pthread_mutex_unlock( &ev->mutex );
+    return true;
+}
+bool event_wait_timed( struct event * ev,
+                       time_t ms )
+{
+    struct timespec ts;
+    int ret = 0;
+
+    clock_gettime( CLOCK_REALTIME, &ts );
+    ts.tv_sec += ms / 1000;
+    ts.tv_nsec += ((ms % 1000) * 1000000);
+    pthread_mutex_lock( &ev->mutex );
+
+    while( (ev->event_triggered == false) && (ret == 0) )
+    {
+        ret = pthread_cond_timedwait( &ev->cond, &ev->mutex, &ts );
+
+        if( ( ret == -1 ) && ( errno == ETIMEDOUT ) )
+        {
+            return false;
+        }
+    }
+
+    ev->event_triggered = false;
+    pthread_mutex_unlock( &ev->mutex );
+    return true;
+}
+
+void event_signal( struct event * ev )
+{
+    pthread_mutex_lock( &ev->mutex );
+    ev->event_triggered = true;
+    pthread_cond_signal( &ev->cond );
+    pthread_mutex_unlock( &ev->mutex );
+}

components/freertos/FreeRTOS-Kernel/portable/linux/utils/wait_for_event.h

@@ -0,0 +1,51 @@
+/*
+ * SPDX-FileCopyrightText: 2021 Amazon.com, Inc. or its affiliates
+ *
+ * SPDX-License-Identifier: MIT
+ */
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef _WAIT_FOR_EVENT_H_
+#define _WAIT_FOR_EVENT_H_
+
+#include <stdbool.h>
+#include <time.h>
+
+struct event;
+
+struct event * event_create();
+void event_delete( struct event * );
+bool event_wait( struct event * ev );
+bool event_wait_timed( struct event * ev,
+                       time_t ms );
+void event_signal( struct event * ev );
+
+
+
+#endif /* ifndef _WAIT_FOR_EVENT_H_ */