Diff: mbed-os/rtos/Mutex.cpp

Revision:

0:6ad07c9019fd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/rtos/Mutex.cpp	Wed May 30 00:01:50 2018 +0000
@@ -0,0 +1,102 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * 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.
+ */
+#include "rtos/Mutex.h"
+#include "rtos/Kernel.h"
+
+#include <string.h>
+#include "mbed_error.h"
+#include "mbed_assert.h"
+
+namespace rtos {
+
+Mutex::Mutex(): _count(0)
+{
+    constructor();
+}
+
+Mutex::Mutex(const char *name)
+{
+    constructor(name);
+}
+
+void Mutex::constructor(const char *name)
+{
+    memset(&_obj_mem, 0, sizeof(_obj_mem));
+    osMutexAttr_t attr = { 0 };
+    attr.name = name ? name : "aplication_unnamed_mutex";
+    attr.cb_mem = &_obj_mem;
+    attr.cb_size = sizeof(_obj_mem);
+    attr.attr_bits = osMutexRecursive | osMutexPrioInherit | osMutexRobust;
+    _id = osMutexNew(&attr);
+    MBED_ASSERT(_id);
+}
+
+osStatus Mutex::lock(uint32_t millisec) {
+    osStatus status = osMutexAcquire(_id, millisec);
+    if (osOK == status) {
+        _count++;
+    }
+    return status;
+}
+
+bool Mutex::trylock() {
+    return trylock_for(0);
+}
+
+bool Mutex::trylock_for(uint32_t millisec) {
+    osStatus status = lock(millisec);
+    if (status == osOK) {
+        return true;
+    }
+
+    MBED_ASSERT(status == osErrorTimeout || status == osErrorResource);
+
+    return false;
+}
+
+bool Mutex::trylock_until(uint64_t millisec) {
+    uint64_t now = Kernel::get_ms_count();
+
+    if (now >= millisec) {
+        return trylock();
+    } else if (millisec - now >= osWaitForever) {
+        // API permits early return
+        return trylock_for(osWaitForever - 1);
+    } else {
+        return trylock_for(millisec - now);
+    }
+}
+
+osStatus Mutex::unlock() {
+    _count--;
+    return osMutexRelease(_id);
+}
+
+osThreadId Mutex::get_owner() {
+    return osMutexGetOwner(_id);
+}
+
+Mutex::~Mutex() {
+    osMutexDelete(_id);
+}
+
+}