From eafaeb9398216dacb92de69683ccdda6007efb1d Mon Sep 17 00:00:00 2001 From: patacongo Date: Sun, 20 Mar 2011 18:18:19 +0000 Subject: Move nuttx/examples to apps/examples git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3405 42af7a65-404d-4744-a932-0658087f49c3 --- apps/examples/pipe/interlock_test.c | 224 ++++++++++++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100644 apps/examples/pipe/interlock_test.c (limited to 'apps/examples/pipe/interlock_test.c') diff --git a/apps/examples/pipe/interlock_test.c b/apps/examples/pipe/interlock_test.c new file mode 100644 index 000000000..e049a65f6 --- /dev/null +++ b/apps/examples/pipe/interlock_test.c @@ -0,0 +1,224 @@ +/**************************************************************************** + * examples/pipe/interlock_test.c + * + * Copyright (C) 2008 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include +#include + +#include + +#include +#include +#include +#include + +#include "pipe.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: null_writer + ****************************************************************************/ + +static void *null_writer(pthread_addr_t pvarg) +{ + int fd; + + /* Wait a bit */ + + printf("null_writer: started -- sleeping\n"); + sleep(5); + + /* Then open the FIFO for write access */ + + printf("null_writer: Opening FIFO for write access\n"); + fd = open(FIFO_PATH2, O_WRONLY); + if (fd < 0) + { + fprintf(stderr, "null_writer: Failed to open FIFO %s for writing, errno=%d\n", + FIFO_PATH2, errno); + return (void*)1; + } + + /* Wait a bit more */ + + printf("null_writer: Opened %s for writing -- sleeping\n", FIFO_PATH2); + sleep(5); + + /* Then close the FIFO */ + + printf("null_writer: Closing %s\n", FIFO_PATH2); + if (close(fd) != 0) + { + fprintf(stderr, "null_writer: close failed: %d\n", errno); + } + sleep(5); + + printf("null_writer: Returning success\n"); + return (void*)0; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: interlock_test + ****************************************************************************/ + +int interlock_test(void) +{ + pthread_t writerid; + void *value; + char data[16]; + ssize_t nbytes; + int fd; + int ret; + + /* Create a FIFO */ + + ret = mkfifo(FIFO_PATH2, 0666); + if (ret < 0) + { + fprintf(stderr, "interlock_test: mkfifo failed with errno=%d\n", errno); + return 1; + } + + /* Start the null_writer_thread */ + + printf("interlock_test: Starting null_writer thread\n"); + ret = pthread_create(&writerid, NULL, null_writer, (pthread_addr_t)NULL); + if (ret != 0) + { + fprintf(stderr, "interlock_test: Failed to create null_writer thread, error=%d\n", ret); + ret = 2; + goto errout_with_fifo; + } + + /* Open one end of the FIFO for reading. This open call should block until the + * null_writer thread opens the other end of the FIFO for writing. + */ + + printf("interlock_test: Opening FIFO for read access\n"); + fd = open(FIFO_PATH2, O_RDONLY); + if (fd < 0) + { + fprintf(stderr, "interlock_test: Failed to open FIFO %s for reading, errno=%d\n", + FIFO_PATH2, errno); + ret = 3; + goto errout_with_thread; + } + + /* Attempt to read one byte from the FIFO. This should return end-of-file because + * the null_writer closes the FIFO without writing anything. + */ + + printf("interlock_test: Reading from %s\n", FIFO_PATH2); + nbytes = read(fd, data, 16); + if (nbytes < 0 ) + { + fprintf(stderr, "interlock_test: read failed, errno=%d\n", errno); + ret = 4; + goto errout_with_file; + } + else if (ret != 0) + { + fprintf(stderr, "interlock_test: Read %d bytes of data -- aborting: %d\n", nbytes); + ret = 5; + goto errout_with_file; + } + + /* Close the file */ + + printf("interlock_test: Closing %s\n", FIFO_PATH2); + if (close(fd) != 0) + { + fprintf(stderr, "interlock_test: close failed: %d\n", errno); + } + + /* Wait for null_writer thread to complete */ + + printf("interlock_test: Waiting for null_writer thread\n"); + ret = pthread_join(writerid, &value); + if (ret != 0) + { + fprintf(stderr, "interlock_test: pthread_join failed, error=%d\n", ret); + ret = 6; + goto errout_with_fifo; + } + else + { + printf("interlock_test: writer returned %d\n", (int)value); + if (value != (void*)0) + { + ret = 7; + goto errout_with_fifo; + } + } + + /* unlink(FIFO_PATH2); */ + printf("interlock_test: Returning success\n"); + return 0; + +errout_with_file: + if (close(fd) != 0) + { + fprintf(stderr, "interlock_test: close failed: %d\n", errno); + } +errout_with_thread: + pthread_detach(writerid); + pthread_cancel(writerid); +errout_with_fifo: + /* unlink(FIFO_PATH2); */ + printf("interlock_test: Returning %d\n", ret); + return ret; +} -- cgit v1.2.3