05-05-2011
Try fprintf(stderr, "%p\n", v); to see if the pointer value has become corrupted somehow.
If all you're passing is one integer, why allocate memory at all?
void *value=(void *)42;
int ivalue=(int)(value);
If that's not all you're doing, post a more complete portion of your code so we can see what's actually going on.
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT FREEBSD
pthread_attr_get_np
PTHREAD_ATTR_GET_NP(3) BSD Library Functions Manual PTHREAD_ATTR_GET_NP(3)
NAME
pthread_attr_get_np -- get attributes of existent thread
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread_np.h>
int
pthread_attr_get_np(pthread_t pid, pthread_attr_t *dst);
DESCRIPTION
The pthread_attr_get_np() function is used to get existent thread's attributes. Most fields of pthread_attr_t structure are exact values of
attributes provided at thread creation time (as parameter to pthread_create(3) function), except for the stack address.
Value returned as dst is supposed to be used in conjunction with pthread_attr_get*() functions to retrieve individual values from
pthread_attr_t structure. Parameter dst should point to allocated memory area big enough to fit this structure.
It is HIGHLY RECOMMENDED to use pthread_attr_init(3) function to allocate attribute storage.
IMPLEMENTATION NOTES
The pthread_attr_get_np() function will always return a pointer to the thread's real stack address, regardless of its value in the original
attributes structure.
RETURN VALUES
If successful, pthread_attr_get_np() function returns 0. Otherwise, an error number is returned to indicate the error.
EXAMPLES
size_t
my_thread_stack_size(pthread_t pid)
{
pthread_attr_t attr;
size_t size;
pthread_attr_init(&attr);
pthread_attr_get_np(pid, &attr);
pthread_attr_getstacksize(&attr, &size);
pthread_attr_destroy(&attr);
return(size);
}
ERRORS
The pthread_attr_get_np() function will fail if:
[EINVAL] Invalid value for one of given parameters.
[ESRC] No thread could be found corresponding to that specified by the given thread ID.
SEE ALSO
pthread_attr_destroy(3), pthread_attr_getdetachstate(3), pthread_attr_getinheritsched(3), pthread_attr_getschedparam(3),
pthread_attr_getschedpolicy(3), pthread_attr_getscope(3), pthread_attr_getstack(3), pthread_attr_getstackaddr(3),
pthread_attr_getstacksize(3), pthread_attr_init(3)
AUTHORS
The pthread_attr_get_np() function and this manual page were written by Alexey Zelkin <phantom@FreeBSD.org>.
BSD
January 31, 2003 BSD