Hi, something for the night: Can someone explain why normal pthreads can be restricted to initially use only the stack size provided via pthread_attr_setstacksize() while any rt-mapped thread (posix and native) refuse to accept this? For a simple test, compile the attached program one time as normal
gcc -lpthread -o stacksize stacksize.c
and the other time against xeno's posix skin
gcc `xeno-config --posix-cflags` `xeno-config --posix-ldflags` \
-o stacksize.o stacksize.c
Then compare the memory requirements of both processes - they should
differ by 2M, the stack size when pthread_attr_setstacksize is not used.
Strange - and also critical when considering larger applications...
So far I only tested against 2.1, but I don't see a reason why 2.0.x
should behave different. Will get checked, though.
Any ideas?
Jan
#include <sys/mman.h>
#include <unistd.h>
#include <limits.h>
#include <pthread.h>
static void *simple_thread(void *arg)
{
sleep(30);
return 0;
}
int main (int ac, char **av)
{
pthread_t pth;
pthread_attr_t attr;
mlockall(MCL_CURRENT | MCL_FUTURE);
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN);
pthread_create(&pth, &attr, simple_thread, NULL);
sleep(30);
return 0;
}
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