Diff: mbed-cloud-client/update-client-hub/modules/atomic-queue/source/critical-posix.c

Revision:

0:276e7a263c35

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-cloud-client/update-client-hub/modules/atomic-queue/source/critical-posix.c	Mon Jul 02 06:30:39 2018 +0000
@@ -0,0 +1,72 @@
+// ----------------------------------------------------------------------------
+// Copyright 2015-2017 ARM Ltd.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed 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.
+// ----------------------------------------------------------------------------
+
+#if defined(TARGET_LIKE_POSIX) && !defined(ATOMIC_QUEUE_USE_PAL)
+
+// It's probably a better idea to define _POSIX_SOURCE in the target description
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
+#include <stdint.h>
+#include <assert.h>
+#include <unistd.h>
+#include <signal.h>
+#include <pthread.h>
+
+// Module include
+#include "aq_critical.h"
+
+static pthread_mutex_t* get_mutex() {
+    static int initialized = 0;
+    static pthread_mutex_t Mutex;
+    if (!initialized)
+    {
+        pthread_mutexattr_t Attr;
+        pthread_mutexattr_init(&Attr);
+        pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
+        pthread_mutex_init(&Mutex, &Attr);
+        initialized = 1;
+    }
+    return &Mutex;
+}
+
+static volatile unsigned irq_nesting_depth = 0;
+static sigset_t old_sig_set;
+
+void aq_critical_section_enter() {
+    pthread_mutex_lock(get_mutex());
+    if (++irq_nesting_depth == 1) {
+        int rc;
+        sigset_t full_set;
+        rc = sigfillset(&full_set);
+        assert(rc == 0);
+        rc = sigprocmask(SIG_BLOCK, &full_set, &old_sig_set);
+        assert(rc == 0);
+    }
+}
+
+void aq_critical_section_exit() {
+    assert(irq_nesting_depth > 0);
+    if (--irq_nesting_depth == 0) {
+        int rc = sigprocmask(SIG_SETMASK, &old_sig_set, NULL);
+        assert(rc == 0);
+    }
+    pthread_mutex_unlock(get_mutex());
+}
+#endif // defined(TARGET_LIKE_POSIX)