The normal threaded way to do what is suggested is to create a monitor thread for notification and use pthread_cond primitives for the synchronization.
Example code follows.
Except, instead of liveloop in main(), you'd join on the monitoring thread which would exit the process group in case of calamitous error.
Last edited by ramen_noodle; 09-08-2008 at 05:08 PM..
Hello,
i have 2 questions:
1. Can I get the current memory usage of a thread?
2. Can I use a member-function as (void*)(*)(void*) method to create a new thread with "pthread_create(...)"??
I would be happy about any suggestion.
Regards,
Rolf (2 Replies)
Hi all!
I am implementing an http server in c++ using the posix thread, but i am having a memory leak and i cannot find the reason.
I have already commented out the section that initializes the threads and i found out, the problem is when i initialize/run the threads.
In the threads i have... (1 Reply)
I am facing a strange error while creating posix threads:
Given below are two snippets of code, the first one works whereas the second one gives a garbage value in the output.
Snippet 1
This works:
--------------
int *threadids;
threadids = (int *) malloc (num_threads * sizeof(int));
... (4 Replies)
i am creating threads in my program using the POSIX interface.
when the thread starts executing i run out of memory and get a core dump.
i have tried to increase the threads stack size using pthread_attr_setstacksize, but of no use since i guess the dynamic memory is allocated on the heap and... (1 Reply)
Hi All,
I have scenario where my callback function data_update() can be called anytime. I have written the function data_update() such that it will create detached thread for processing the data sent to this function.
data_update()
{
pthread_attr_t attr_thread;
... (1 Reply)
Hi All,
I am creating detached threads using pthread_create(). As we know, we need to pass the thread attribute structure as an argument to the pthread_Create() API.
I want to know what is the good time to destroy this thread attributes using pthread_attr_destroy() call. Also, I want to know... (2 Replies)
is there a better way to check if a port is active on linux and sunos systems?
this is currently what I'm using in my script:
netstat -an | egrep -i "$PORT"
i know this isn't the best way as there could be numbers in that output that has my port number in it but isn't necessarily a... (0 Replies)
I want to create a program that creates 2 child process, and each of them creates 2 threads, and each thread prints its thread id. I0ve allread done that the outuput isn't the outuput i want.
When a run the following comand "$./a.out | sort -u | wc -l" I have the folowing output
2
$:
It should... (3 Replies)
Discussion started by: pharaoh
3 Replies
LEARN ABOUT OSX
pthread_create
PTHREAD_CREATE(3) BSD Library Functions Manual PTHREAD_CREATE(3)NAME
pthread_create -- create a new thread
SYNOPSIS
#include <pthread.h>
int
pthread_create(pthread_t *restrict thread, const pthread_attr_t *restrict attr, void *(*start_routine)(void *), void *restrict arg);
DESCRIPTION
The pthread_create() function is used to create a new thread, with attributes specified by attr, within a process. If attr is NULL, the
default attributes are used. If the attributes specified by attr are modified later, the thread's attributes are not affected. Upon suc-
cessful completion, pthread_create() will store the ID of the created thread in the location specified by thread.
Upon its creation, the thread executes start_routine, with arg as its sole argument. If start_routine returns, the effect is as if there was
an implicit call to pthread_exit(), using the return value of start_routine as the exit status. Note that the thread in which main() was
originally invoked differs from this. When it returns from main(), the effect is as if there was an implicit call to exit(), using the
return value of main() as the exit status.
Upon thread exit the storage for the thread must be reclaimed by another thread via a call to pthread_join(). Alternatively,
pthread_detach() may be called on the thread to indicate that the system may automatically reclaim the thread storage upon exit. The
pthread_attr_setdetachstate() function may be used on the attr argument passed to pthread_create() in order to achieve the same effect as a
call to pthread_detach() on the newly created thread.
The signal state of the new thread is initialized as:
o The signal mask is inherited from the creating thread.
o The set of signals pending for the new thread is empty.
RETURN VALUES
If successful, the pthread_create() function will return zero. Otherwise, an error number will be returned to indicate the error.
ERRORS
pthread_create() will fail if:
[EAGAIN] The system lacked the necessary resources to create another thread, or the system-imposed limit on the total number of
threads in a process [PTHREAD_THREADS_MAX] would be exceeded.
[EINVAL] The value specified by attr is invalid.
SEE ALSO fork(2), pthread_cleanup_pop(3), pthread_cleanup_push(3), pthread_detach(3), pthread_exit(3), pthread_join(3)STANDARDS
pthread_create() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').
BSD April 4, 1996 BSD