AFAICS, there is nothing wrong with your program. However, your assumption that the thread ID have to be unique is wrong. It is only unique for each process, but not system wide:
Now sort-u will produce only 2 entries:
Cheers,
/Lew
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)
Hello,
I have created program that run threads one by one, maximum 100. Each thread will process one block of data, and once it`s finished, new thread is created with new block of data....etc
I have array of values to control status of each thread, like this:
array_thread_status=1... (11 Replies)
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)
Discussion started by: aniketkadu2002
1 Replies
LEARN ABOUT FREEBSD
pthread_key_create
PTHREAD_KEY_CREATE(3) BSD Library Functions Manual PTHREAD_KEY_CREATE(3)NAME
pthread_key_create -- thread-specific data key creation
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int
pthread_key_create(pthread_key_t *key, void (*destructor)(void *));
DESCRIPTION
The pthread_key_create() function creates a thread-specific data key visible to all threads in the process. Key values provided by
pthread_key_create() are opaque objects used to locate thread-specific data. Although the same key value may be used by different threads,
the values bound to the key by pthread_setspecific() are maintained on a per-thread basis and persist for the life of the calling thread.
Upon key creation, the value NULL is associated with the new key in all active threads. Upon thread creation, the value NULL is associated
with all defined keys in the new thread.
An optional destructor function may be associated with each key value. At thread exit, if a key value has a non-NULL destructor pointer, and
the thread has a non-NULL value associated with the key, the function pointed to is called with the current associated value as its sole
argument. The order of destructor calls is unspecified if more than one destructor exists for a thread when it exits.
If, after all the destructors have been called for all non-NULL values with associated destructors, there are still some non-NULL values with
associated destructors, then the process is repeated. If, after at least [PTHREAD_DESTRUCTOR_ITERATIONS] iterations of destructor calls for
outstanding non-NULL values, there are still some non-NULL values with associated destructors, the implementation stops calling destructors.
RETURN VALUES
If successful, the pthread_key_create() function will store the newly created key value at the location specified by key and returns zero.
Otherwise an error number will be returned to indicate the error.
ERRORS
The pthread_key_create() function will fail if:
[EAGAIN] The system lacked the necessary resources to create another thread-specific data key, or the system-imposed limit on the
total number of keys per process [PTHREAD_KEYS_MAX] would be exceeded.
[ENOMEM] Insufficient memory exists to create the key.
SEE ALSO pthread_getspecific(3), pthread_key_delete(3), pthread_setspecific(3)STANDARDS
The pthread_key_create() function conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').
BSD April 4, 1996 BSD