Problem in read() system call in Xenomai-2.4

Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users Problem in read() system call in Xenomai-2.4
# 1  
Old 09-24-2009
Problem in read() system call in Xenomai-2.4

Dear All,

I am having problem with read() system call in Blocking Mode.
In my driver interrupt intimation done through RT FIFO. so i have created the RT FIFO and open the FIFO using open() system call with O_RDONLY flag and i am waiting for interrupt using read() blocking call.initally its running correctly. While handling the continuous interrupt, the read()system call is not released from blocking mode. But the driver is putting the data into RTFIFO.
This problem is happenning continuously.

Frequency of the interrupt: 700us & 7.3ms

Time Line of interrupt :

| Int1 | 700us | Int2 | 7.3ms|| Int1 | 700us | Int2 | 7.3ms|
|----------------------------------------------------------| .....
| 8ms || 8ms |

Kindly help me in this regards.SmilieSmilie
# 2  
Old 09-25-2009
I cannot find any information on RT fifo's except that they're considered "legacy" now, replaced by message pipes. One way I've found to unstick pipes and fifos is to write a newline at the end of your data, if it's buffering despite it all a newline can flush them. I have no idea if this applies to an rt-fifo. I might find more if I knew what function calls you were using to create the rt-fifo.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. AIX

Audit problem : A system call received a parameter that is not valid.

while i try to start the audit i have the below error message . audit>audit start ** auditing enabled already A system call received a parameter that is not valid. please advice (6 Replies)
Discussion started by: thecobra151
6 Replies

2. Programming

Problem with execution of fork system call if i use \n

hi all, i tried the following source codes: fork1.c: main() { printf("demo of fork\n"); fork(); printf("hello"); } output: demo of fork hello hello fork2.c: main() (3 Replies)
Discussion started by: pnirmala
3 Replies

3. UNIX for Advanced & Expert Users

read system call reading the same data

Hi, I wrote a program, to read from a master terminal. However, the 'read' system call keeps returning the same data endlessly (I expected it to read once and then block). What will cause t data to be flushed, after 1 read? #include <stdio.h> #include <string.h> #include <sys/types.h>... (1 Reply)
Discussion started by: karthikb23
1 Replies

4. Programming

Problem with socket binding - "system" call

Hi, I am having an issue with using sockets. I have a program which binds to a socket and listen on it. Later I spawn a thread to handle some function. In the new thread created I need to call a shell script which executes the specified function. Here I am using a system command to call the... (5 Replies)
Discussion started by: Janardhanbr
5 Replies

5. Linux

system call problem

hi, where can I find the detail information about the syscall in binary instructions of linux/mips. for example, in linux/mips: li v0, 4140 syscall it's a syacall of "lseek" , but how can I find that which registers will be used in this syscall , and the meaning of the arguments in the... (2 Replies)
Discussion started by: zerocool_08
2 Replies

6. Programming

Problem with signal handler and interrupted system call

Hi, I have a daq program that runs in an infinite loop until it receives SIGINT. A handler catches the signal and sets a flag to stop the while loop. After the loop some things have to be cleaned up. The problem is that I want my main while loop to wait until the next full second begins, to... (2 Replies)
Discussion started by: soeckel
2 Replies

7. AIX

problem in msgctl() system call

Hi, i am using IBM P6 server and OS is AIX 5.3. my code is written in c/pro C. i am facing problem in msgctl() system call.The variables msg_qbytes and msg_cbytes are used to store total no of bytes and current no of bytes in a QUEUE,but it is showing me as ZERO though data are there... (0 Replies)
Discussion started by: ajaysahoo
0 Replies

8. UNIX for Advanced & Expert Users

how to differentiate system call from library call

Hi, Ho do I differentiate system call from library call? for example if I am using chmod , how do I find out if it is a system call or library call? Thanks Muru (2 Replies)
Discussion started by: muru
2 Replies

9. Programming

Problem in system call

Dear Friends, I write a c program to list the directories recursively. For this I write a function called my_readdir to read the content of directory. For this I use read system call it returns -1, then I use readdir system call it gives comment terminated error or segmentation... (1 Reply)
Discussion started by: spmlingam
1 Replies

10. Programming

read system call

When i read 4 bytes from a socket the read function returns 0 value. what does it mean? How should i know whether a message is available in the socket or not? (1 Reply)
Discussion started by: Madhu Babu
1 Replies
Login or Register to Ask a Question