Here is simple code for multithreading in POSIX:
void* simplethread(void* arg)
{
printf("Hello World\n");
}
int main(void)
{
pthread_t id;
pthread_create(&id, NULL, simplethread, NULL);
return 0;
}
Whether the new thread will run or not depends on the OS. Tricky ... (5 Replies)
Hello
My problem goes like this:
I have used Pthread_create, and I have tryed to create 2 proccess but nothing happens! It does not even matter what the function im trying to create do. It is if im trying to activate an empty function. This is my code.
Any help will be highly appreciated.... (1 Reply)
how can I find cpu usage memory usage swap usage and
I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times
my final destination is monitor process
logical volume usage above X % and number of Logical voluage above
can I not to... (3 Replies)
Hi.
I use C++ and I wishes to create a thread with the pthread_create function, my question is, how can I do this if I wish that the function will be a member of the class ??
I know from windows programming that I can declare a static function like this
static unsigned int __stdcall... (7 Replies)
Hi guys.
H was learning posix threads in C with anjuta IDE. it gives me
undefined reference to `pthread_create'
I know i should compile it like:
gcc -lpthread main.c
how should i import this configuration in anjuta so i can compile inside it? (2 Replies)
The prototype for pthread_create function is like this:-
int pthread_create(pthread_t *thread,pthread_attr_t *attr,void *(*start routine),void *arg);
Q.1 .Why the return type of the start_routine must be void*??
Q.2. Why should we pass arg by converting into void * only ??
Thank You (3 Replies)
Hi,
I'm trying to do my homework assignment but I am having trouble using the pthread_create fucntion.
Here is my code________________
//Alicia Johnson
//sum_pid program
//creates n number of threads. These threads create a random number
//then adds the number to a global array. Then... (1 Reply)
Suppose I have a simple program main() with a global varibale int x=0.
int x = 0;
main()
{
print("%d\n",x);
}
I want to create two threads/process which must access this variable x in sync.
Which one will be better threads( pthread_create ) or process( fork )?
If I go with fork() then... (1 Reply)
Discussion started by: rupeshkp728
1 Replies
LEARN ABOUT OSX
pthread_attr_set_getscope
PTHREAD_ATTR(3) BSD Library Functions Manual PTHREAD_ATTR(3)NAME
pthread_attr_getscope, pthread_attr_setscope -- thread attribute operations
SYNOPSIS
#include <pthread.h>
int
pthread_attr_getscope(const pthread_attr_t *restrict attr, int *restrict contentionscope);
int
pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);
DESCRIPTION
Thread attributes are used to specify parameters to pthread_create(). One attribute object can be used in multiple calls to
pthread_create(), with or without modifications between calls.
The pthread_attr_setscope() and pthread_attr_getscope() functions, respectively, set and get the attribute within attr argument that controls
the contention scope of the thread. The acceptable values are PTHREAD_SCOPE_SYSTEM, indicating a scheduling contention scope that is system-
wide, and PTHREAD_SCOPE_PROCESS, which indicates a process scheduling contention scope. Currently on Mac OS X we only support
PTHREAD_SCOPE_SYSTEM.
RETURN VALUES
If successful, these functions return 0. Otherwise, an error number is returned to indicate the error.
ERRORS
pthread_attr_getscope() will fail if:
[EINVAL] Invalid value for attr.
pthread_attr_setscope() will fail if:
[EINVAL] Invalid value for attr.
[ENOTSUP] Invalid or unsupported value for contentionscope.
SEE ALSO pthread_create(3), pthread_attr_init(3), pthread_attr_setinheritsched(3), pthread_attr_setschedpolicy(3), pthread_attr_setschedparam(3)STANDARDS
pthread_attr_setscope(), pthread_attr_getscope() conform to Version 2 of the Single UNIX Specification (``SUSv2'')
BSD December 31, 2007 BSD
09-20-2006
