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There is a memory leak issue when close a pipe.
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1. Add macro check in rtdebug.h;
2. Use RT_USING_POSIX for poll/select, stdin etc.
3. Split dfs_posix.h to dfs_posix.h, dfs_poll.h and dfs_select.h;
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method/functions.
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1. Change 'rt_uint8_t' type of cmd to 'int';
2. Add waitqueue;
3. Split device ipc header files;
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Pipe have many differences with char device. The main difference is
altough pipe have both read and write, it is unidirectional in nature.
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Some reader(FinSh again) would like to block on a semaphore which is
released in rx_indicate. So we should invoke rx_indicate in
_rt_pipe_resume_reader.
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The previous implementation will always blocks the reader/writer.
However, at least FinSh would expect the device to be nonblocking ---
read should return 0 when there is no data in it.
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This provide the possibility that allocate the buffer of the ringbuffer
on a specific region, instead of always mallocing it. It also bring us
the benefit of using pipe device on the systems without heap.
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2529 bbd45198-f89e-11dd-88c7-29a3b14d5316
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2431 bbd45198-f89e-11dd-88c7-29a3b14d5316
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2384 bbd45198-f89e-11dd-88c7-29a3b14d5316
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the available data of ring buffer.
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2313 bbd45198-f89e-11dd-88c7-29a3b14d5316
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