Rahul Dahiya / Mbed OS STM32F7 Ethernet

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mbed-os/platform/mbed_poll.cpp@0:fb8047b156bb, 2020-01-15 (annotated)

Committer:
rahul_dahiya
Date:
Wed Jan 15 15:57:15 2020 +0530
Revision:
0:fb8047b156bb
STM32F7 LWIP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rahul_dahiya 0:fb8047b156bb 1 /* mbed Microcontroller Library
rahul_dahiya 0:fb8047b156bb 2 * Copyright (c) 2017 ARM Limited
rahul_dahiya 0:fb8047b156bb 3 *
rahul_dahiya 0:fb8047b156bb 4 * Licensed under the Apache License, Version 2.0 (the "License");
rahul_dahiya 0:fb8047b156bb 5 * you may not use this file except in compliance with the License.
rahul_dahiya 0:fb8047b156bb 6 * You may obtain a copy of the License at
rahul_dahiya 0:fb8047b156bb 7 *
rahul_dahiya 0:fb8047b156bb 8 * http://www.apache.org/licenses/LICENSE-2.0
rahul_dahiya 0:fb8047b156bb 9 *
rahul_dahiya 0:fb8047b156bb 10 * Unless required by applicable law or agreed to in writing, software
rahul_dahiya 0:fb8047b156bb 11 * distributed under the License is distributed on an "AS IS" BASIS,
rahul_dahiya 0:fb8047b156bb 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rahul_dahiya 0:fb8047b156bb 13 * See the License for the specific language governing permissions and
rahul_dahiya 0:fb8047b156bb 14 * limitations under the License.
rahul_dahiya 0:fb8047b156bb 15 */
rahul_dahiya 0:fb8047b156bb 16 #include "mbed_poll.h"
rahul_dahiya 0:fb8047b156bb 17 #include "FileHandle.h"
rahul_dahiya 0:fb8047b156bb 18 #include "Timer.h"
rahul_dahiya 0:fb8047b156bb 19 #ifdef MBED_CONF_RTOS_PRESENT
rahul_dahiya 0:fb8047b156bb 20 #include "rtos/Thread.h"
rahul_dahiya 0:fb8047b156bb 21 #endif
rahul_dahiya 0:fb8047b156bb 22
rahul_dahiya 0:fb8047b156bb 23 namespace mbed {
rahul_dahiya 0:fb8047b156bb 24
rahul_dahiya 0:fb8047b156bb 25 // timeout -1 forever, or milliseconds
rahul_dahiya 0:fb8047b156bb 26 int poll(pollfh fhs[], unsigned nfhs, int timeout)
rahul_dahiya 0:fb8047b156bb 27 {
rahul_dahiya 0:fb8047b156bb 28 /**
rahul_dahiya 0:fb8047b156bb 29 * TODO Proper wake-up mechanism.
rahul_dahiya 0:fb8047b156bb 30 * In order to correctly detect availability of read/write a FileHandle, we needed
rahul_dahiya 0:fb8047b156bb 31 * a select or poll mechanisms. We opted for poll as POSIX defines in
rahul_dahiya 0:fb8047b156bb 32 * http://pubs.opengroup.org/onlinepubs/009695399/functions/poll.html Currently,
rahul_dahiya 0:fb8047b156bb 33 * mbed::poll() just spins and scans filehandles looking for any events we are
rahul_dahiya 0:fb8047b156bb 34 * interested in. In future, his spinning behaviour will be replaced with
rahul_dahiya 0:fb8047b156bb 35 * condition variables.
rahul_dahiya 0:fb8047b156bb 36 */
rahul_dahiya 0:fb8047b156bb 37 Timer timer;
rahul_dahiya 0:fb8047b156bb 38 if (timeout > 0) {
rahul_dahiya 0:fb8047b156bb 39 timer.start();
rahul_dahiya 0:fb8047b156bb 40 }
rahul_dahiya 0:fb8047b156bb 41
rahul_dahiya 0:fb8047b156bb 42 int count = 0;
rahul_dahiya 0:fb8047b156bb 43 for (;;) {
rahul_dahiya 0:fb8047b156bb 44 /* Scan the file handles */
rahul_dahiya 0:fb8047b156bb 45 for (unsigned n = 0; n < nfhs; n++) {
rahul_dahiya 0:fb8047b156bb 46 FileHandle *fh = fhs[n].fh;
rahul_dahiya 0:fb8047b156bb 47 short mask = fhs[n].events | POLLERR | POLLHUP | POLLNVAL;
rahul_dahiya 0:fb8047b156bb 48 if (fh) {
rahul_dahiya 0:fb8047b156bb 49 fhs[n].revents = fh->poll(mask) & mask;
rahul_dahiya 0:fb8047b156bb 50 } else {
rahul_dahiya 0:fb8047b156bb 51 fhs[n].revents = POLLNVAL;
rahul_dahiya 0:fb8047b156bb 52 }
rahul_dahiya 0:fb8047b156bb 53 if (fhs[n].revents) {
rahul_dahiya 0:fb8047b156bb 54 count++;
rahul_dahiya 0:fb8047b156bb 55 }
rahul_dahiya 0:fb8047b156bb 56 }
rahul_dahiya 0:fb8047b156bb 57
rahul_dahiya 0:fb8047b156bb 58 if (count) {
rahul_dahiya 0:fb8047b156bb 59 break;
rahul_dahiya 0:fb8047b156bb 60 }
rahul_dahiya 0:fb8047b156bb 61
rahul_dahiya 0:fb8047b156bb 62 /* Nothing selected - this is where timeout handling would be needed */
rahul_dahiya 0:fb8047b156bb 63 if (timeout == 0 || (timeout > 0 && timer.read_ms() > timeout)) {
rahul_dahiya 0:fb8047b156bb 64 break;
rahul_dahiya 0:fb8047b156bb 65 }
rahul_dahiya 0:fb8047b156bb 66 #ifdef MBED_CONF_RTOS_PRESENT
rahul_dahiya 0:fb8047b156bb 67 // TODO - proper blocking
rahul_dahiya 0:fb8047b156bb 68 // wait for condition variable, wait queue whatever here
rahul_dahiya 0:fb8047b156bb 69 rtos::Thread::wait(1);
rahul_dahiya 0:fb8047b156bb 70 #endif
rahul_dahiya 0:fb8047b156bb 71 }
rahul_dahiya 0:fb8047b156bb 72 return count;
rahul_dahiya 0:fb8047b156bb 73 }
rahul_dahiya 0:fb8047b156bb 74
rahul_dahiya 0:fb8047b156bb 75 } // namespace mbed