Asynchronous file I/O

BradDaBug · 03-18-2006, 10:01 PM

I'm trying to get started with AIO, but I'm having trouble. Whenever I include linux/aio.h I get all sorts of compiler errors, mostly involving incomplete and undeclared types inside the headers that aio.h includes.

Am I doing something wrong?

pankaj99 · 03-18-2006, 10:32 PM

may be you have not included some other headers nedded as well.
posting the error messages might help us to know more.

BradDaBug · 03-18-2006, 10:42 PM

This is the errors I get:

Code:

In file included from /usr/include/linux/workqueue.h:8,
                 from /usr/include/linux/aio.h:5,
                 from ../include/filesystem/aio_helper.h:5,
                 from ../include/filesystem/filesystem.h:9,
                 from filesystem/filesystem.cpp:1:
/usr/include/linux/timer.h:12: error: field `entry' has incomplete type
/usr/include/linux/timer.h:35: error: syntax error before `(' token
/usr/include/linux/timer.h: In function `int timer_pending(const timer_list*)':
/usr/include/linux/timer.h:49: error: 'const struct timer_list' has no member
   named 'entry'
In file included from /usr/include/linux/aio.h:5,
                 from ../include/filesystem/aio_helper.h:5,
                 from ../include/filesystem/filesystem.h:9,
                 from filesystem/filesystem.cpp:1:
/usr/include/linux/workqueue.h: At global scope:
/usr/include/linux/workqueue.h:16: error: field `entry' has incomplete type
In file included from /usr/include/asm/system.h:8,
                 from /usr/include/asm-i486/processor.h:18,
                 from /usr/include/asm/processor.h:8,
                 from /usr/include/asm-i486/atomic.h:6,
                 from /usr/include/asm/atomic.h:8,
                 from /usr/include/linux/aio.h:8,
                 from ../include/filesystem/aio_helper.h:5,
                 from ../include/filesystem/filesystem.h:9,
                 from filesystem/filesystem.cpp:1:
/usr/include/asm-i486/system.h:247: error: syntax error before `new'
/usr/include/asm-i486/system.h: In function `long unsigned int __cmpxchg(...)':
/usr/include/asm-i486/system.h:250: error: `size' undeclared (first use this
   function)
/usr/include/asm-i486/system.h:250: error: (Each undeclared identifier is
   reported only once for each function it appears in.)
/usr/include/asm-i486/system.h:254: error: syntax error before `)' token
/usr/include/asm-i486/system.h:260: error: syntax error before `)' token
/usr/include/asm-i486/system.h:266: error: syntax error before `)' token
/usr/include/asm-i486/system.h:270: error: `old' undeclared (first use this
   function)
In file included from /usr/include/asm/processor.h:8,
                 from /usr/include/asm-i486/atomic.h:6,
                 from /usr/include/asm/atomic.h:8,
                 from /usr/include/linux/aio.h:8,
                 from ../include/filesystem/aio_helper.h:5,
                 from ../include/filesystem/filesystem.h:9,
                 from filesystem/filesystem.cpp:1:
/usr/include/asm-i486/processor.h: In function `void load_esp0(tss_struct*,
   thread_struct*)':
/usr/include/asm-i486/processor.h:486: error: `unlikely' undeclared (first use
   this function)
In file included from ../include/filesystem/aio_helper.h:5,
                 from ../include/filesystem/filesystem.h:9,
                 from filesystem/filesystem.cpp:1:
/usr/include/linux/aio.h: At global scope:
/usr/include/linux/aio.h:47: error: field `ki_run_list' has incomplete type
/usr/include/linux/aio.h:58: error: field `ki_list' has incomplete type
/usr/include/linux/aio.h:72: error: 'wait_queue_t' is used as a type, but is
   not defined as a type.
/usr/include/linux/aio.h:77: error: syntax error before `private'
/usr/include/linux/aio.h:139: error: syntax error before `;' token
/usr/include/linux/aio.h:144: error: field `active_reqs' has incomplete type
/usr/include/linux/aio.h:145: error: field `run_list' has incomplete type
/usr/include/linux/aio.h: In function `kiocb* list_kiocb(list_head*)':
/usr/include/linux/aio.h:194: error: syntax error before `,' token
/usr/include/linux/aio.h:194: error: `ki_list' undeclared (first use this
   function)
/usr/include/linux/aio.h:194: error: `list_entry' undeclared (first use this
   function)

tamoneya · 03-18-2006, 11:17 PM

source code helps. Then we can help you debug it

BradDaBug · 03-19-2006, 01:00 AM

Here's the entire contents of the file that includes the header:

Code:

#ifndef AIO_HELPER
#define AIO_HELPER

#if defined linux
#	include <linux/aio.h>
#endif

namespace FileSystem
{
#if defined linux
	// linux version of the class
	class AIOHelper
	{
	public:
		
	};
#endif
	
};

#endif // AIO_HELPER

There's not much there. Even if I create a blank .cpp file that looks like this:

Code:

#include <linux/aio.h>

int main()
{
	return 0;
}

then I get the same errors.

BradDaBug · 03-19-2006, 05:11 PM

Hmm, if I do #include <aio.h> instead of #include <linux/aio.h> then it compiles.