Dear colleagues,
One of my friend have a problem with c code. While compiling a c program it displays a message like
"array type has incomplete element type". Any body can provide a solution for it.
Jaganadh.G (1 Reply)
Hello there,
Here is how it goes - I have written a small test driver as an exercise to "Linux Device Drivers" and as a preparation for writing a real, functional driver.
For the sake of seeing how far I got it working (I already implemented the open(0, read(), write() and ioctl() calls) I... (4 Replies)
I'm trying to compile a 2.4.26 kernel but I have to apply two patches to it.
The patches are:
linux-2.4.26-xbox.patch
openMosix-2.4.26-1
This is the reason that it doesn't compile. There is only one error but I'm not familiar with C or C++(Unfortunately only Java and some lower-level... (2 Replies)
If one wants to get a start address of a array or a string or a block of memory via a function, there are at least two methods to achieve it:
(1) one is to pass a pointer-to-pointer parameter, like:
int my_malloc(int size, char **pmem)
{
*pmem=(char *)malloc(size);
if(*pmem==NULL)... (11 Replies)
I'm getting the following Error:
prepare_pcap.c: In function `prepare_pkts':
prepare_pcap.c:127: error: dereferencing pointer to incomplete type
prepare_pcap.c:138: error: dereferencing pointer to incomplete type
====================================
This is the part of the relevant... (8 Replies)
Hi all, this warning is driving me nuts. I use -pedantic with -Wall and -Werror so this needs to be fixed.
BUILD: GNU-Linux-x86
Any ideas?
struct sockaddr_in server_addr;
int addr_len = sizeof (server_addr);
fd = accept(link->socket_fd,
(struct sockaddr_in *)... (2 Replies)
I have what should be a relatively simple program (fadec.c) that maps a struct from an included header file (fadec.h) to a shared memory region, but I’m struggling accessing members in the struct from the pointer returned by shmat. Ultimately, I want to access members in the shared memory structure... (2 Replies)
I am getting a dereferencing pointer to incomplete type error when i compile the following code on lines highlighted in red. Can anyone help me in identifying what is wrong in the code?
#include<stdio.h>
#include<stdlib.h>
typedef struct{
int info;
struct node* link ;
} node;
void... (3 Replies)
Hi all, I'm new programming in C, so I had the next message in my code:
Dual.c:88:20: warning: pointer type mismatch in conditional expression : &clientSa.sin6.sin6.sin6_addr,
Any help would be great
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include... (1 Reply)
Discussion started by: godna
1 Replies
LEARN ABOUT LINUX
pthread_getcpuclockid
PTHREAD_GETCPUCLOCKID(3) Linux Programmer's Manual PTHREAD_GETCPUCLOCKID(3)NAME
pthread_getcpuclockid - retrieve ID of a thread's CPU time clock
SYNOPSIS
#include <pthread.h>
#include <time.h>
int pthread_getcpuclockid(pthread_t thread, clockid_t *clock_id);
Compile and link with -pthread.
DESCRIPTION
The pthread_getcpuclockid() function returns the clock ID for the CPU time clock of the thread thread.
RETURN VALUE
On success, this function returns 0; on error, it returns a nonzero error number.
ERRORS
ENOENT Per-thread CPU time clocks are not supported by the system.
ESRCH No thread with the ID thread could be found.
VERSIONS
This function is available in glibc since version 2.2.
CONFORMING TO
POSIX.1-2001.
NOTES
When thread refers to the calling thread, this function returns an identifier that refers to the same clock manipulated by clock_gettime(2)
and clock_settime(2) when given the clock ID CLOCK_THREAD_CPUTIME_ID.
EXAMPLE
The program below creates a thread and then uses clock_gettime(2) to retrieve the total process CPU time, and the per-thread CPU time con-
sumed by the two threads. The following shell session shows an example run:
$ ./a.out
Main thread sleeping
Subthread starting infinite loop
Main thread consuming some CPU time...
Process total CPU time: 1.368
Main thread CPU time: 0.376
Subthread CPU time: 0.992
Program source
/* Link with "-lrt" */
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>
#include <errno.h>
#define handle_error(msg)
do { perror(msg); exit(EXIT_FAILURE); } while (0)
#define handle_error_en(en, msg)
do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)
static void *
thread_start(void *arg)
{
printf("Subthread starting infinite loop
");
for (;;)
continue;
}
static void
pclock(char *msg, clockid_t cid)
{
struct timespec ts;
printf("%s", msg);
if (clock_gettime(cid, &ts) == -1)
handle_error("clock_gettime");
printf("%4ld.%03ld
", ts.tv_sec, ts.tv_nsec / 1000000);
}
int
main(int argc, char *argv[])
{
pthread_t thread;
clockid_t cid;
int j, s;
s = pthread_create(&thread, NULL, thread_start, NULL);
if (s != 0)
handle_error_en(s, "pthread_create");
printf("Main thread sleeping
");
sleep(1);
printf("Main thread consuming some CPU time...
");
for (j = 0; j < 2000000; j++)
getppid();
pclock("Process total CPU time: ", CLOCK_PROCESS_CPUTIME_ID);
s = pthread_getcpuclockid(pthread_self(), &cid);
if (s != 0)
handle_error_en(s, "pthread_getcpuclockid");
pclock("Main thread CPU time: ", cid);
/* The preceding 4 lines of code could have been replaced by:
pclock("Main thread CPU time: ", CLOCK_THREAD_CPUTIME_ID); */
s = pthread_getcpuclockid(thread, &cid);
if (s != 0)
handle_error_en(s, "pthread_getcpuclockid");
pclock("Subthread CPU time: 1 ", cid);
exit(EXIT_SUCCESS); /* Terminates both threads */
}
SEE ALSO clock_gettime(2), clock_settime(2), timer_create(2), clock_getcpuclockid(3), pthread_self(3), pthreads(7), time(7)COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2009-02-08 PTHREAD_GETCPUCLOCKID(3)