01-27-2010
strange... You can start normally start hundredths of threads, even if your box has only one CPU available.
Loïc
10 More Discussions You Might Find Interesting
1. Programming
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)
Discussion started by: _rocky
5 Replies
2. Programming
how to do with that?
after cc -o xxxx xxxx.c
ld:
Unresolved:
_pthread_create
_pthread_deteach
_pthread_exit
Thanks (3 Replies)
Discussion started by: zhshqzyc
3 Replies
3. Programming
I have a problem with a C multi-threaded program I am writing. I cannot figure out how to keep the unique key value at the thread level. I wrote a program in C that forked a bunch of processes and then decided to convert it to threads and I can't keep the key unique to each thread. In a nutshell... (3 Replies)
Discussion started by: jenmead
3 Replies
4. Programming
Hi
I wanted to learn communication between threads and I used a simple example but
I faced with this error while I have a sofware that uses this functions without
any problem
so would you please help me to know the reason
thanks for your help and great favor.
#include <pthread.h>... (2 Replies)
Discussion started by: netman
2 Replies
5. Programming
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)
Discussion started by: Hellboy
1 Replies
6. Programming
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)
Discussion started by: shvalb
7 Replies
7. Programming
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)
Discussion started by: majid.merkava
2 Replies
8. Programming
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)
Discussion started by: sunil_abhay
3 Replies
9. UNIX for Dummies Questions & Answers
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)
Discussion started by: ajohns38
1 Replies
10. Programming
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 MINIX
pthread_join
PTHREAD_JOIN(3) Linux Programmer's Manual PTHREAD_JOIN(3)
NAME
pthread_join - join with a terminated thread
SYNOPSIS
#include <pthread.h>
int pthread_join(pthread_t thread, void **retval);
Compile and link with -pthread.
DESCRIPTION
The pthread_join() function waits for the thread specified by thread to terminate. If that thread has already terminated, then
pthread_join() returns immediately. The thread specified by thread must be joinable.
If retval is not NULL, then pthread_join() copies the exit status of the target thread (i.e., the value that the target thread supplied to
pthread_exit(3)) into the location pointed to by retval. If the target thread was canceled, then PTHREAD_CANCELED is placed in the loca-
tion pointed to by retval.
If multiple threads simultaneously try to join with the same thread, the results are undefined. If the thread calling pthread_join() is
canceled, then the target thread will remain joinable (i.e., it will not be detached).
RETURN VALUE
On success, pthread_join() returns 0; on error, it returns an error number.
ERRORS
EDEADLK
A deadlock was detected (e.g., two threads tried to join with each other); or thread specifies the calling thread.
EINVAL thread is not a joinable thread.
EINVAL Another thread is already waiting to join with this thread.
ESRCH No thread with the ID thread could be found.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+---------------+---------------+---------+
|Interface | Attribute | Value |
+---------------+---------------+---------+
|pthread_join() | Thread safety | MT-Safe |
+---------------+---------------+---------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
NOTES
After a successful call to pthread_join(), the caller is guaranteed that the target thread has terminated. The caller may then choose to
do any clean-up that is required after termination of the thread (e.g., freeing memory or other resources that were allocated to the target
thread).
Joining with a thread that has previously been joined results in undefined behavior.
Failure to join with a thread that is joinable (i.e., one that is not detached), produces a "zombie thread". Avoid doing this, since each
zombie thread consumes some system resources, and when enough zombie threads have accumulated, it will no longer be possible to create new
threads (or processes).
There is no pthreads analog of waitpid(-1, &status, 0), that is, "join with any terminated thread". If you believe you need this function-
ality, you probably need to rethink your application design.
All of the threads in a process are peers: any thread can join with any other thread in the process.
EXAMPLE
See pthread_create(3).
SEE ALSO
pthread_cancel(3), pthread_create(3), pthread_detach(3), pthread_exit(3), pthread_tryjoin_np(3), pthreads(7)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 PTHREAD_JOIN(3)