Diff: mbed-os/rtos/Semaphore.cpp

Revision:

9:d58e77ebd769

diff -r 6c2a12d6b1bf -r d58e77ebd769 mbed-os/rtos/Semaphore.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/rtos/Semaphore.cpp	Fri Mar 02 07:12:37 2018 -0700
@@ -0,0 +1,82 @@
+/* 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/Semaphore.h"
+#include "rtos/Kernel.h"
+#include "platform/mbed_assert.h"
+
+#include <string.h>
+
+namespace rtos {
+
+Semaphore::Semaphore(int32_t count) {
+    constructor(count, 0xffff);
+}
+
+Semaphore::Semaphore(int32_t count, uint16_t max_count) {
+    constructor(count, max_count);
+}
+
+void Semaphore::constructor(int32_t count, uint16_t max_count) {
+    memset(&_obj_mem, 0, sizeof(_obj_mem));
+    osSemaphoreAttr_t attr = { 0 };
+    attr.cb_mem = &_obj_mem;
+    attr.cb_size = sizeof(_obj_mem);
+    _id = osSemaphoreNew(max_count, count, &attr);
+    MBED_ASSERT(_id != NULL);
+}
+
+int32_t Semaphore::wait(uint32_t millisec) {
+    osStatus_t stat = osSemaphoreAcquire(_id, millisec);
+    switch (stat) {
+        case osOK:
+            return osSemaphoreGetCount(_id) + 1;
+        case osErrorTimeout:
+        case osErrorResource:
+            return 0;
+        case osErrorParameter:
+        default:
+            return -1;
+    }
+}
+
+int32_t Semaphore::wait_until(uint64_t millisec) {
+    uint64_t now = Kernel::get_ms_count();
+
+    if (now >= millisec) {
+        return wait(0);
+    } else if (millisec - now >= osWaitForever) {
+        // API permits early return
+        return wait(osWaitForever - 1);
+    } else {
+        return wait(millisec - now);
+    }
+}
+
+osStatus Semaphore::release(void) {
+    return osSemaphoreRelease(_id);
+}
+
+Semaphore::~Semaphore() {
+    osSemaphoreDelete(_id);
+}
+
+}